特許翻訳上達 ガイドブック
Contents
1. U S Patent Jun 17 2003 Sheet 2 of 2 US 6 578 860 B1 FIG 2 US 6 578 860 BI 1 DUAL FUNCTION WHEELCHAIR BACKGROUND OF THE INVENTION 1 Field of the Invention The present invention relates generally to wheelchairs and in particular to a dual function wheelchair that serves as both a conventional wheelchair and a companion wheel chair 2 Description of Related Art Wheelchairs traditionally are categorized as being of one of two types a conventional wheelchair and a companion wheelchair A conventional wheelchair has two large rear wheels that allow the occupant of the chair to propel himself by placing his hands on the two large wheels and rotating the large wheels A companion wheelchair has two small rear wheels that do not allow the occupant to steer or propel the wheelchair Instead the companion wheelchair includes handles on the rear of the chair that permits a second person or companion to push and steer the wheelchair Compan ion wheelchairs because they lack a large rear wheel are easier to fold up and store away and are used frequently when travel is required Those who use a companion wheel chair are typically forced to purchase both types unless one is never in need to drive one s own chair There are many people that could benefit from a companion wheelchair but cannot afford the expense of two wheelchairs and must make do with a conventional wheelchair SUMMARY OF THE INVENTION The p2. UUDUDUDDUDUD DODO DO DO DDD OD 00D 0000000000 ARAN OOO OPA ne AO EE 14200 DODOD O DO DDD OD 00D 0000000000 DODO Do DD O DDD ODO 00 DD 000000000 UOUUU HADO DL o AEG e 82 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDDUD HOUUUUUO DD 0000000 00000 DODO Dd 00D 0000000 HOUUUUUOO O0C0000d0d00000coo00o DO EGE 1000 DODoO0o00000 1000 UE PBE ELE ELFEN EI HOUUUUUOO OR A EE EE i EE ED 83 Copyright C Toshihito Yamamoto All Rights Reserved US006578860B1 12 United States Patent ao Patent No US 6 578 860 B1 Chang 45 Date of Patent Jun 17 2003 54 DUAL FUNCTION WHEELCHAIR 4 962 942 A 10 1990 Barnett et al 280 5 28 5 076 390 A 12 1991 Haskins 75 Inventor Dean C Chang Anaheim Hills CA 5 113 959 A 5 1992 Mastov et al US 5 188 383 A 2 1993 Thompson A E cited by examiner 73 Assignee Evermed Anaheim CA US Primary Examiner Lesley D Morris Notice Subject to any disclaimer the term of this Assistant Examiner Daniel Yeagley patent is extended or adjusted under 35 U S C 154 b by 0 days 7 MT The present invention implements a releasable wheel mount 21 Appl No 10 041 409 ing mechanism and a dual braking system to provide a EN wheelchair that transforms from a conventional wheelchair 22 Filed Jan 7 2002 to a companion wheelchair A set of small rear wheels GU MECL regine B62M 1 14 traditionall
3. Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD DODO DO DO DDD OD 00D 0000000000 LE BE EE EEDD Bd EE 1400 UUIDIHIUIUDUDUUUUUIUIUDDODDUUDDUDUDUD JUUIUIHIHIUDDDUU EEVEE E CED ESE EE EEE ET EEE DODOD OD O DDD OO 00D 0000000000 DODO DO DO DDD OD 00 DD 000000000 Juno 57 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD O00 GC 10000 0000 00000000000000000000000 00 VODUOOODOCOCO 0000000000000 0000000000 00000000000000000000000000 oooo0o0000000000000000 DODO DO DD DDD OD 00D 0000000000 Sonata trio EEE SEI Dedo DODO DO DD 000000000000 PO EHRE EG A ENE ESILE EEE EEE KE E C DDD ODO 00D 0000000000 LEE EE EE E Se E Ee EEE HOUUUUO 58 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD UUIDIHIUHUDDDUUUUUIUIUDUDDUUUDUDUDUD UUIUIHIUIUDUDUUUUUIUIUDDODDUUDDUDUD DODO 00000000000 10000000 NDN 000 i WE LE OE EKE EE To ENG ete Ts El Ge ELE EHE UUIDIHIUIUDUDUUUUUUU NUNO NDN NDN 00D 000000 DON O EEF DE EHED EEDD GCNG e a BO 14 00 EI UU 00000 00000000000000000000 0000000 000000000000000000 0000 HUUYUUOUOOUOUUUUUOUOO 0100000000040000000000010 1000000 EE BEKE RGAE Hue 000000000 EEEE EE EG HE E E EEEO A E DO DDD E 0000000000 59 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD JUUIUIHmIUUDUDDUDUU UUIDIHIHUDUDUU Doo od E DD DN OO DODOD O DO 0 DD OO 00D 0000000000 DODOD ODO 000000000 0000 0000000000000 0000 00 000
4. UUDUDUDDUDUD 00000 Ondara EEDD EI EF EDD FEE GDGD E NDN NDN 00000000 DUNG NOO UUIUIHIUIUDUDDUUUUUUIUUDDUDUDUU EE DEE SERTH UUIDIHIHUDUDUUUUUIUIUDDODDUUDDUDUDUD DODOo do oo 000000 DO BO Dd Dg o 0d Dg 00000000000 0000 DODO DO DO 0 DD OOOO DD 000000000 DODO DO DO DDD OOOO DD 000000000 1000 100000 UDUUUUUIUIUDDDUDUUDDUDUUD OOOGOOUOUUOUOUOODOUOUUU ULE E E EEEE EE EEE aa aca HEE EEE EEE SSE GE Sado Gl EEE EE HOUUUUUOO 5 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD DODODO 00000000000 DODO Do 000000000 HOUUUUO DODOD E EEEE CEE BCEE DD 000000000 UDRH EFE EEO FED El EEE GT EE E SEE DODO DO EMEL O DO E EKE DD 0000000 00000 1000000 NON 00 DODOD OD OD 0D 000000 DODO DO DO 0 DD OD 00D 0000000000 1000000 AEE e UU DODO Do DD O DDD OO 00D 0000000000 AO AO EEE EEE EE DODOoDo 0000000000000 52 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD DODOo0 DD 000 00000000000 000000 DODOD OD O DDD ODO 00D 0000000000 NOD O0CC000dd0000000gogoo DODODO 00000000000 DODOD DD O DDD OO 00D 0000000000 NOD DODO Dd DD O 0 DD OOOO DD 000000000 DODOo Dd ooo 000000 00000000000000000000000000 0000000 UO000d0a0ddgoaogggo DD 00 00000000000000000000 00000000000000000000000000 0000000000000000000000 00000000000000000 53 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD UUIUIHIUIUDUDDUUUUUIUIUDDDDUUUDUDUDUD JUIDIHIUHDDU DODO DO DO DDD
5. In this position the wheel turns unhindered by the lateral projection 190 However when the braking lever 160 is pivoted forward the second pivoting brake member 175 rotates in a manner that moves the lateral projection 190 into the path of the rear wheel 100 causing contact with the wheel The more force that is applied to the braking lever 160 by the user the greater the force of the lateral projection 190 on the wheel 100 until the wheel is either brought to a complete stop or prevented from rotating as may be necessary on an inclined surface If the braking lever 160 is pivoted backward the lateral projection 190 is retracted thereby releasing the rear wheel 100 In this manner the wheelchair 105 is braked while in the conventional mode The second pivoting brake member 175 is also connected to a cable 195 having an outer sheath mounted on the bracket 170 Moving the braking lever 160 and the accompanying movement of the second pivoting brake member 175 causes the cable 195 to be pulled through the sheath The opposite end of the cable 195 is connected to a first pivoting brake 200 mounted adjacent the small rear wheel 140 A spring 215 is provided to bias the first pivoting brake 200 in a non contact position However when the cable 195 is actu ated by the braking lever 160 the portion of the first pivoting brake 200 is rotated by the cable 195 causing a comple mentary movement of the other end of the first pivoting brake 200
6. 000000000000 000000000000000000000 DODO E DO DDD OOOO DD 000000000 DODOD ODO DDD 00000000000 DODOD ODO DDD OOO 0D 0000000000 DODO Dd OD O DDD OOOO DD 000000000 DODOo do oo 000000 DODOD ODO DDD ODO O DD 000000000 DODO Do OD O DDD ODO OD DD 00000000 DODODo 00000000 0000000000000000000000000 1000000000000000000000000 HOUUUUUUUUO 12211 AE ERE EEK EEE E EA DODO Do ODO DDD ODO OD 0000000000 100000 44 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUUDUD InIHIUUDUIUDDDDUD DODO Do DD O 0 DD OOO 0D 0000000000 DODO DO DO DDD OOO 0D 0000000000 11431 EI ERE EEEE EE ERE ERE EL LEE CG OEE CEP EEE ECE EM GED E G EEE EE ED BE EL EEE 0 D0Od0 00000000000 000000000 DODO DO DDD DDD 00D DD 0000000 DODO do 00000000001 DODO DO DDD DD 000 DD 00000000 NDN O O EAA EEE E EEE AAEE EEE e EENE EE EEE E e E EE 45 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD NDN NN NN NDN 0000000000 0000 LAENG AA Aang ADE EEE NDN 00ND DD 0000000000 0000 1000 000 NN Oo Dd 0d 00000000 10000000 UUUUUHUUDUD OO0OUUOUU naaa todo nda DODOD O DO DDD OO 00 DD 000000000 DODO Do OD O DDD OOO 0D 0000000000 VS EEEL EE 00000 DODO Do OD O 0 DD 0000 00000000000 DODO OD DD O 0 DD ODO 00D 0000000000 HOUUUUUUUOO EEE EEE E OD O DDD ODO 00D 0000000000 11913 E BKE ESE EKE EFE ED DIE E NDN NDN 000000000000 000000 UUIUIUUUUUUDDUUIUDDUUIUDUDUDDUU A6 Copyright C 7oshihito Yamamoto All R
7. 0000000000000 DODOD OD O DDD ODO 00D 0000000000 DODO DO DO DDD OOO 0D 0000000000 DODOD OD OD 0D 000000 DODOD OD OD DD OD E 0000000000 DODOD OD O DDD OD 00 DD 000000000 n0 0000000000000000000 JON 000000000000000 10000000 DODO DO DO DD ODO 00D BD DD 0000000 76 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD DODOD DD O DDD OOO 0D 0000000000 DODO DO DD 0000000000000 DODO DO DO DDD OOO 0D 0000000000 DODO DO DO DDD OD 00D 0000000000 EN aaa aaa ooo00000 DODO DO DO DDD OOO 0D 0000000000 DODO Do OD O 0 DD OO 00D 0000000000 DODO Do 0 Dd 0 0000000000 pod OOOO ODO NDN NONONO 10000000040 DODO DO DO DD ODO 00D DDD 00000000 DODO DO DO 00D 00 00D DDD 00000000 DODO DO DD DD 0000 DD DD 00000000 Att aran EE ET EW EI ET El DODO Dd o 0000000 SS Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD AU HAH DD OD DD A E E 0000000000 JUIUIUIUIUDUDUUUUUDUD UUIDIHIUIUDUDDUUUUUIUIUDDODDUUUDUDUDUD UUIDIHIUIUDUDDUUUUUIUHUDUDODDUDUUDDDUDUD UOUUU 009408 000000 00000000000 DADODO ODO DO DO OO 000000 Oo DODO DO DO DDD OD 00 DD 000000000 DODO Do ODO DDD ODO OD DD 00000000 DODO DO DO DDD ODO OD DD 00000000 100000 OOOOUOOUOUOUOUOOOUOOUOOOOUOUOUOOUOOUU BEG EEG CHE BY E u EI ELENEL DEYD ELE uta UUIDIHIUIUDUDUUUUDUHUUDUUUUUDUD 00000000000000000000000000 000000000 0000000000000O 78 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD UNO ON NONONG DODO A
8. DDD OOOO DD 000000000 DODO Dd 0 DDD DO 000000000000 DODO DO DO DDD OOO 0D 0000000000 DODO DO DO DDD OOOO DD 000000000 HOUUUUO DODOD OD OD DD OOOO DDD 00000000 DODO DO DO DDD ODO O DD 000000000 DODO Dd 0 0D 0000000000000 DODO OD DD ODO DD OOO o 0000000000 000000000000000000000000 0000000 D2888880 00 DO OD OD 0 DO Doo oO DADO DO O OD 0000000000 DAA OO Do o o o 0000000000 11 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUUDUD 00000000000 OOOOUOUOUUUOUOOUOOUOOOOUODOUOUOOUUOU DODO DO 0 DD 000000000000 DODO DO DO 0D ODO 00D DDD 00000000 EE BHF ETEF EI EFEFD DDED NANA Rage e ge GG en Get DODO OD DD O DD ODO 00D DDD 00000000 DODOD OD 00D 0000000000 UUIUIHIUIUDUUUUUUIUUUDDUUUUUUUD UUIUDIHIUUDUUUUUUUUUUDDUUUUUUUD JUIUIUIUUDUUUUUUUIUUDDUUUUUUUD IUIDIUIUIUDUUUUUUIUIUUDDUU DODO OD DD O 0D OO 00D DDD 00000000 DODO DO DD 0D OD 00D DDD 00000000 DODO Do 000000000 HEEK DE EIG aran DODODO DD DD OOO 0D DDD 0D E DO Dd a DD OOO NUN NN UND DD DON O O O Copyright C 7oshihito Yamamoto All Rights Reserved UUDUDUDDUDUD DODO DO DO 0 DD OD 00D 0000000000 DODO DO DDD 000000 00000000 DODO Do OD O 0 DD OOOO DD 000000000 DODO DO Dd OD DD ODO 00 DD 000000000 EE EEE EE EE EEE DODO DO DO DDD OOOO DD 000000000 DODO DO DO DDD OOOO DD 000000000 1201228 DE ED GE DD EE EI EEF ED FF DODO DO DO DDD OOOO DD 000000000 DODOD DD O DDD OOOO DD 000000000 DODO 00000000000 100000000000000 0000000 00 EEG EEG CTE
9. Yamamoto All Rights Reserved UUDUDUDDUDUD DODOD OD O DDD OD 00 DD 000000000 1000 DODO DO DO DDD OOO 0D 0000000000 DODO DO DO DDD ODO 0D 0000000000 DODO DO DO DDD OOO 0D 0000000000 DODOD OD 000000000 DODO DO DO DDD OOOO DD 000000000 DODO Do O DO DDD OD 00D 0000000000 DODO DO DO DDD ODO 0 DD 000000000 HOUUUUUUUO EE 1 SEO 15 5 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 100 HOOUOHOUOOOOOOU HOOUUUUUO DODOD ODO DDD ODO 0D 0000000000 100000 0000000000000000000000000 ONOOUOUUODOUUUUUODOUUUUOOOU Qooo DODO DO DD DD ODO 00D DDD 00000000 DODO DO DD DD OOO 0D DDD 0D 000000 DODO Dd o o 000000 NN NN DO UND 0000000000 DON 1000000 NDN DD DN NOO HOUUUUUUO DODO DO DD DD OD 00D DDD DD 000000 NDN NN NUN DD 000000 O 10000 DODO Do odo 000000000 00000000 NUNO DN 6 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 0000000000000 E EA gado NN NN DO DD DD 0000 DD O EKEREGE EKE CV EE EP EE EMG Ch GEM ELE E Ed EFE DODO do Dd 00 000000 NDN DD DN EE EE REES BEA EDD YE BEAN E DE EEF EEF DODO DO DO DDD 0000 00000000000 DODO DO DO DDD ODO 00D 0000000000 NDN NN DDD DO 0000000 0000000000 DODO DO MODO DO DD OD NOD DOO 10000 DODO DO DO DDD ODO 00D 0000000000 DODO DO DD DDD 0000 00000000000 HEE KE CREE ENEE Buek E ESTED BEEF EE ED DODODO DO DDD ODO 0D 0000000000 DODO DO 0D 00 0D 00000000000 DODO DO OD 0 DDD ODO 00 DD 000000000 DODO DO DO DD DO 000 00000000000 STE
10. conjunction with the accompanying drawings in which like reference numerals designate like parts throughout the figures thereof and wherein FIG 1 is an elevated perspective view of a preferred embodiment of the present invention showing the invention in conventional mode and FIG 2 is a side view of a preferred embodiment of the present invention showing the invention in companion mode 10 15 20 25 30 35 45 50 55 60 65 2 DESCRIPTION OF THE PREFERRED EMBODIMENTS The following description is provided to enable any person skilled in the art to make and use the invention and sets forth the best modes contemplated by the inventor of carrying out his invention Various modifications however will remain readily apparent to those skilled in the art since the general principles of the present invention have been defined herein specifically to provide a dual finction wheel chair with a single actuator braking system FIG 1 is an elevated perspective view of the present invention in its conventional mode That is two large rear wheels 100 are mounted on the chair 105 that allow the occupant of the chair to reach over the armrests 110 and grasp the wheels rim 115 and push on the wheels 100 Pushing both wheels at once causes the wheelchair 105 to move forward in a well known manner while moving the left or right wheel more than the other will cause the wheelchair to turn Other components of
11. first and second set of rear wheels are both rotatably attached to the frame for simultaneous movement with the wheelchair the second set of rear wheels is removable mounted on said wheelchair whereby the wheelchair is configured as a companion wheelchair further comprising a braking system for applying a bracking contact to both the first set of rear wheels and the second set of rear wheels the braking stem actuated by a lever mounted on the wheelchair 2 The wheelchair of claim 1 wherein the braking system comprises a first pivoting member coupled to said lever for applying direct pressure to said second set of rear wheels and a cable connected to the first pivoting member for controlling a second pivoting member that applies direct pressure to said first set of rear wheels 3 The wheelchair of claim 2 wherein the braking system further comprises a spring to bias the second pivoting member in a 25 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD non braking condition 4 A convertible wheelchair having a frame unit for supporting a seat comprising a pair of front wheels operatively connected to the frame unit a first set of rear wheels operatively connected to the frame unit a second set of rear wheels larger in diameter than the first set of rear wheels is operatively connected to the frame unit and removably connected to the frame unit and a braking system operatively connected to the frame unit
12. s occupant To enable the dual nature of the chair the present invention employs a braking system that allows the chair to be stopped by the occupant in either mode A mechanical lever system applies a braking force to the large wheels when the chair is in the conventional mode and a cable connection allows the same lever to actuate a similar braking operation on the small wheels in the companion mode Thus the present invention provides a wheelchair that easily converts from a companion mode to a conventional mode and offers a unique single lever braking system that operates in both modes 18 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD BRIEF DESCRIPTION OF THE DRAWINGS The exact nature of this invention as well as its objects and advantages will become readily apparent upon reference to the following detailed description when considered in conjunction with the accompanying drawings in which like reference numerals designate like parts throughout the figures thereof and wherein FIG 1 is an elevated perspective view of a preferred embodiment of the present invention showing the invention in conventional mode and FIG 2 is a side view of a preferred embodiment of the present invention showing the invention in companion mode DESCRIPTION OF THE PREFERRED EMBODIMENTS The following description is provided to enable any person skilled in the art to make and use the invention and sets forth th
13. the wheelchair such as the back support 120 seat 125 front wheels 130 and front wheel supports 135 are conventional components that do not require further elaboration for an understanding of the present invention FIG 1 also illustrates a second set of rear wheels 140 that are of similar diameter and size to the front wheels 130 as is typical of companion wheelchairs The small rear wheels 140 are supported on the frame 145 of the wheelchair 105 at rear brackets 150 It is contemplated that the small rear wheels 140 remain attached to the wheel chair 105 while the present invention is operating in either mode since the large wheels 100 may be position to be either redundant with the small wheels 140 i e mutually touching the ground or they may elevate the small wheels 140 slightly off the ground during operation in the conventional mode FIG 2 is a side view of the present invention shown in the companion mode The large rear wheels 100 have been removed and the small rear wheels 140 along with the small front wheels 130 form the rolling mode for the chair A cylindrical mounting slot 155 on each side of the frame 145 provides a mounting location for the large wheels 100 The large wheels 100 may be secured with a threaded member such as a bolt that engages with a threaded portion of the slot 155 or the wheel may be secured with another quick release mechanisms The nature of the connection of the large wheel requires only that the
14. through the pivot pin 205 The end of the first pivoting brake 200 includes a lateral projection 210 that contacts the small rear wheel 140 when the first pivoting brake 200 is actuated The spring 215 returns the first pivoting brake 200 to the non contact position when the force is removed from the braking lever 160 As can be appreciated the wheelchair of the present invention converts easily and rapidly from a conventional wheelchair to a companion wheelchair by simply removing the large wheels that provide the occupant with a mode of propulsion To facilitate the transition between the two modes a braking system has been developed that operates in either mode to arrest the motion of the wheelchair or prevent the wheelchair from moving while the brake is set The present invention solves the problem encountered by those who would like to own both a conventional wheelchair and a companion wheelchair without having to purchase two separate wheelchairs Those skilled in the art will appreciate that various adaptations and modifications of the just described preferred embodiment can be configured without departing from the scope and spirit of the invention Therefore it is to be understood that within the scope of the appended claims the invention may be practiced other than as specifically described herein What is claimed is 1 A wheelchair having a set of front wheels and a first set of rear wheels generally having the same diameter
15. while the present invention is operating in either 20 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD mode since the large wheels 100 may be position to be either redundant with the small wheels 140 i e mutually touching the ground or they may elevate the small wheels 140 slightly off the ground during operation in the conventional mode FIG 2 is a side view of the present invention shown in the companion mode The large rear wheels 100 have been removed and the small rear wheels 140 along with the small front wheels 130 form the rolling mode for the chair A cylindrical mounting slot 155 on each side of the frame 145 provides a mounting location for the large wheels 100 The large wheels 100 may be secured with a threaded member such as a bolt that engages with a threaded portion of the slot 155 or the wheel may be secured with another guick release mechanisms The nature of the connection of the large wheel reguires only that the wheel be securely fastened when in operation without unduly hindering the rotation of the wheel with surplus friction that would hinder the operation of the chair while allowing the wheel to be removed without undo effort FIG 2 further illustrates a unigue braking mechanism that permits the occupant of the chair to decelerate or hold stationary the wheelchair using a hand operated braking system in either the conventional or 21 Copyright C 7oshihito Yamamoto All Ri
16. 0000 DODO DO DO DDD OOO OD 0000000000 EEG EEG CHE EE EA EE Een GER OE aut 100000000 DUNONG DD DN OO HEEE HKEE EA HE EIEH EFE EEE EE NOD 35 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 1000 UDUDUUUUUIUIUDDODUUUDUDUDUD UUIDIHIUIUDUDDUUUUUIUIUDDODDUUUDDUDUDUD DODOD O DO 00D 00000000000 DODO DO DO DDD OOOO DD 000000000 DODO DO DO DDD OD 00D 0000000000 ELE EIEH EKEREGE FEE El EF ERDF Ea rara JUUIUIHIUIUDUDUUUUUDUD UUIDIHIHUDUDUUUUUUU HUN DD DN DODO DO DO DDD ODO 0D 0000000000 HOUUUUO DODOD OD O DDD OOOO DD 000000000 DODO Do SENE DD OD 00D 0000000000 DODO B OD OO DD OOOO DD 000000000 DODOD OD 000000000 DODOD OD O DDD OOO 0D 0000000000 Oe EE ECE EG EHE aaa EFE EEF FF EF EFE HOUUUUOO 36 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD Oe OE EUD EU EEE DY EFE EE EL CIEE TE EE Ta EEE 2000000000U0U00000000000 000 14 81 ERE EERE CEE CEEE EE E EE EEE 1418 ELAD ENE 000000010 a EEA e EE E E 0000000000 DODO Dd O 0D 0000000000000 DODOD ODO 0 DD ODO O DD 000000000 DODOo do oo 000000 DODO Do DD 0 0 DD OD 00D 0000000000 DODO DO OD 00D 0000 DO 0000000000 DODO DO DO DDD ODO 00D 0000000000 EGE EE EE EE ED ona daa UOUUU sB Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUUDUD HOHUUUOUUUUUUUOO DODO DO DD 0D 00000 DDD 00000000 HOUUUU DODODO DD DD OOO 0D DDD 00000000 Natura CV EFPDD EE EFEIEI o ge Gl dd DODO DO NN NONONO DUN DD OD 000
17. 00000 DODO OD OD OD DD ODO 00D 0000000000 DODO Dd 0 0D 0000000000000 70 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUUDUD 10000 OHOOOOOUOOOU 100000 DUUUDUHIUUDDUUU YUU 10000000000 00000000 000 U OOOGOUOOOUOUOUOOUOOUOOOODOUOUOUOOUUOOUU DODODO 0000000000 ODO Do o 0000000 DD CHET aaa EEF E ELLE E NODOD000000000000000 00 DADO ODO DO DOOD0OD0ODo0Do0D0 AU HAHHA 1000040000000 2 0 Et DODO Do DD O DDD OD 00D 0000000000 HOUUUUUO ED EA EHRE ENE u ERE ESE EEE ED EI ELEHD UUIDIHIUIUDUDUUUUDUHUUDUUUUUDUD JUIDIHIUIUDUDUUUUUIUIUDDODDUUUDUDUDUD DODO Dd 0 0D 000000000000 ST Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD UUIUIHIUIUDDDUUUUUIUIUDDUDDUUUDUUDUD HOUUUUUOO DODO DO DO DDD OOOO DD 000000000 DODO DO DO DDD OD 00D 0000000000 ELE EIEH EKEREGE FEE El EF ERDF Ea rara JUUIUIHIUIUDUDUUUUUDUD UUIUIHIUIUDDDUUUUUIUIUDDDDDUUUDU 0 DODO Dd E 0D 0 DO 0000 0000000000 0000000 000000000000 000000 000000000000 00000000000000 000000000000 00000000000000 000000000040000000 EE EPERE YEE EG DODO DO DD DD OOO 0D DDD 00000000 100000000000 DONG DO 0000000000 NGONGO 399 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD CHEI ET EI EER EEE EI BUTE El ED EU 00000 10000000 NUNO NOO 1000 02000000000000U0U0U0000 O DODODO OD 00D 000 0D DDD 00000000 DODO Dd o o 000000 DODO DO DO DD DD UD DODODO DD 00000000 DODODO DD DD OD 00D DDD 0D 000000 DO OOOOUUOUOOU
18. 00000000000 ODOOUOO OOD OUUODOUODUOUUODUUUUUUUOUUO 00000 DODO DO DO DDD OOOO DD 000000000 Dodo DQ DN A U H E OD OD DD OOOO DD 000000000 DODOo Do 0 Dd NDN NUNO 100000 DODODO0 DDD 0000000 E uE A preferred chassis assembly has an adjustable vertical member 115 allowing it to be accepted by various sized chassis receiving areas and therefore used in a variety of different printers 60 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 10000000U00 DOODdo bd NDN DN OO DODOD O DO 000000000 100000 DODO OD DD O DDD OOOO DD 000000000 EICH ED EEO FEL El EEE EDI EE HED EEEL CE EEE EE ED EKRE ELE EL EL EE ELE EEO EF ELE HOUUUUUUUO 1000 DO DO DD 0000 DD 000000000 HOU dd Dd O Dn DD ODO 0 DD 000000000 DODOo 00 0 000000000000 DODOD OD O DDD ODO 0 DD 000000000 DODOD OD 0 EREE 000000 61 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 10000 DN JUUIDIHIUIUDUDUUUUUHUDDDOUD DODO DO DO DDD OD 00 DD 000000000 DODOo 0d 00D 0000000 DODOD ODO DDD OD 00D 0000000000 DODO Dd DO 0D 000000000000 DODO Do 0 DO 0 DD ODO 00D 0000000000 DODO DO DO DDD OOOO DD 000000000 DODOD OD O DDD ODO OD 0000000000 DODO Dd O DDD 0000000 0000000 E A N DODODDDooo000D00 DODO DO DD DD OOOO DB DD DD 000000 DODO EO BESE EE aaa aaa taa atada 62 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 0000000000000000000000000 00000000000000000000000000 0000000 DODO DO
19. 00000000000000000000 40 BI TEIE EE TEI TEE EE SEI HOUUU 000000000000000000000000 DADA Dd ooo DD 0000000000000 DODO OD OD ODO DD OOOO DD 000000000 EEG EEG CHE EE EO EEE Eh ED aida OOOOUOOUOUOUOUOOUOUOOOODOU DODO OD DD OD DD OD 00D 0000000000 DODO Do ODO DDD OOO 0D 0000000000 38 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD HOUUUUUUUOO ERYR EEOC Eh EP EE EE EE DODOo do oo 000000 DODO Do E EEEE EKE REE 0000000000 BEEE EKEKO ENA ENEA EI EEEn ER ELE EEE EE O0C00d000d00000Coo00o DODOD O DO DDD ODO 00D 0000000000 DODO DO DO 0 DD OD 00 DD 000000000 DODO Dd 00D 0000000 DODOD OD O DDD OOO 0 DD 000000000 DODO DO DD OD DD OD E E E 0000000000 ANA EU E IAE FY EJ nora Ge GHEY EE EI EEE ETERO DODO E DDD 0 DO 0000000 000000000 EEE CEP EO peda o nodo atada HOUUUUOO 39 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD UUIDIHIUIUDUDDUUUUUIUIUDDODUUODUDUDUD DODO 0 00 00 DD 0000000000000 DODO DO DO DDD ODO 00 DD 000000000 LEE EFE EPEE EEVEE EE CED ESE EE EEE EEE EEE jo EEE EGER EERE ee EEE EEE Gh EEE 1000 DO Da DO DO DD OOO DDD NDN DD QD OO DODO DO DO DDD ODO 0 DD 000000000 HOUUUUO 00000000 000000000000 np 10000000 DODO Do Dd 00 000000 OOOUOUOOUOUOU O UIUUIUUDUUUUUIUUUDDUUUUUUUD 01000 NN NN NN UND 00000 000000000 O 40 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD DODOo 0d 0 oo 000000 LAHELE EEE EEE 1000 0000000000
20. 4 NUNO UUIDIHIUIUDUDUUUUUIUIUDUDODDUDUUDUDUD LEL EC EFO FED EEF EM GED ELE RESO EEE ET EIEH ER EL SEE UUIDIHIUIUDUDUU DODONG OO DEM SVE Eh ONE EE PIE ED EE e E Ep tel i HOUUUUUO a EI EFE DERE NA NANANAHAN ENE D000 a EAL E aaa BENANAHANE NN 10000000000 EEE ERE DD NO DE MCEFEFEFEFER LEDD Sho EEE HEDD TEE EIEH EEE UUIUIHIUIUDDDUUUUUIUIUDDUDDUUDUUDUD 4 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD UUIDIHIUIUDUDUUUUUIUIUDDODDUUDUDUDUD DODO 0d 000000000 DODO DO DO OO OD 00000000 DODO DO DD O0 00000000000 DOBO gg o OO O OD 00000000 DO ag oooO 0 0 000000000 DOBO DD OOOO OD 00000000 1000 O0C000000000000000000000oo DODO do 000000 00000000d00000d000aogoD 00000000000000000000000000 00000000000000000000000000 00000000000000000000000000 000000 DODO DO DD DD OOO 0D DDD 00000000 42 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD UUIDIHIUIUDUDUUUUUIUIUDDODDUUDUDUDUD JUUIDIUIUUDUDDUDUDUDUD UUIDIHIUHUDUDDUUUUUIUIUDDDDUUUDDUDUDUD UUIDIHIUIUDUDUUUUUIUIUDDOUDDUDUUDUDUDUD JUIUIHIUHIUDDUDU DODO DO DO DDD OOOO DD 000000000 1000 DODOD ODO DDD ODO 00D 0000000000 nod 000000000000000 00000000 DODO Do OD O 0 DD OD E DD 000000000 DODO B DD O 0D DO 000 DD 000000000 DODO DO DO DDD OOOO DD 000000000 UU 12211 AE ERE EEK EEE E EA DODOD DD O DDD ODO 00D 0000000000 HOUUUUUUUO 43 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 000000000
21. Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD HOUUUUUUUO Ee EEA EOE EEKE E A EE EE H EREE EE DODO DO DO 0 DD ODO 0D 0000000000 DODODo ODO 0 DD 00000000000 HULLE EEE EEE EEE ET EE EKE DODO DO DO DDD OOO 0D 0000000000 DODOoDo E 000000000000 AE EE EE 00000000 10000000000004 DODO DO DD DD OD 00D DDD OD 000000 DODO DO DO DD ODO 00D 0000000000 DODOD O DD 0D OD 00D DDD DD 000000 DODODO DD DD ODO 00D DDD 00000000 DODO DO DD DD OD 00D DDD 00000000 DODO HS B E BERE 0000000000 EP DR EREE E E E DD E E E EEEE 8 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 0100 EEE EA EOE EEKE E A EE EE H EREE AEE EEE E EE EEE E OOOO DD 000000000 ERE c ODO E E eE e ENEE E EE HE GE E 0 DD 0000000000000 20 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD IDnHIUDDUDDDUU DODODO DD 0D 00 00D DDD 00000000 00000000040 00 O000O00O000d0o 0000000 EEE EU EE ECE ENEE VG ED TER EEE DODO DO DO DD OOOO DD DDD 0000000 DODO DO DD DD OD 00D O DDD 0000000 DODODOo 000000000 DODO DO DD DD ODO 00D DD DD 0000000 DODO DO DD DD ODO 00D BD DD 0000000 DODO DO 0000000000000 DODO DO DD DD OD 00D DDD 00000000 DODo0000 DO Be gn O O DO DO O oD ooo oooo 0000000000000 000000000000 DODOD ODO DDD OOOO DD 000000000 10 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD IUIUDIHIUIUDDDUUUUUIUIUDUDODDUUUDUDUDUD DOO DODOD DD O 0 DD OOO 0D 0000000000 DODO DO DO
22. DO DDD OOOO DDD 00000000 DODO DO DO DDD OD 000000000 0000000000000000000000 OD 000 000000000000000000010 00000000000000000000000000 000 DODO DO DO DDD OD 00D 0D 00000000 DODO DO DO DDD ODO 00D 0000000000 DODO Dd 0 0D 0000000000000 DODO DO Dd OD DD OOO 0D 0000000000 EEG EEG CEE Ea B BEEE E COO eee EYE DODO E E 0D 0000000000000 Cae E a Y EP gt I EB E UUIUIHIUIUDUUUUUUIUIUUUDDUUUUUUUD 63 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD HOUUYUUUUUOO DODO Do DD O 0 DD OD 00D 0000000000 DODOD O DO DD DO DO 00D 0000000000 00000000000000000000000000 Doo0o00000000000000000007 JO00000000000000000000 10000000 U00000000000000 DODODO DD DD OD 00D O DDD 0000000 DODODOo 0000000000 1000 dad 0 0 Doo 00000000000 UD DODO DO DD DD OOO 0D DD 000000000 DODO DO DDD 000000000000 AE A EFE EDD EE DODO DO DD DD OD 00D DDD 00000000 HOUUUO DODO DO DD DD ODO 0D OD DD 0000000 64 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD AU HAH OD O 0 DD 0000 DD 000000000 0100000 UUIDIHIUIUDDDUUUUUIUIUDDDUUUDUDUDUD DODO OD DD OD DD OOO 0D 0000000000 DODO DO DO DDD OD 00D 0000000000 HOUUU 0000000000000000 00000 020000000000000 00000000 0000 DODO DO DD DD ODO 00D O DDD 0000000 DODoo000 DODO DO DD DD OD 00D DD DD 0000000 NN NN DO DD 0D 00000000000 0000 0040442000040 400400000dd0 HOUUUO 00000000000000 0000000 1000000U00U0U0000000000000 65 Copyright C Toshihito Yamamoto Al
23. DO DO DO DDD ODO 00D 0000000000 En EEF DFEHEF O EY EL EI ELENEL EERO ELECTED ED LEE BEE E O DO DDD OO 00D 0000000000 Oe EEE EE aaa rara O0C0000000000 39 o Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD UUIDIHIUHUDDDUUUUUIUIUDUDODDUUUUUDUD NDN UND NDN NO O DEBE 100000000 DUNONG DD DD NOO DODO DD 000 DD 000000000000 0000 00000000000 00000000000000 DODOD 000000000000000 00000000000000 DODOD ODO DDD OOOO DDD 00000000 DODO DO DO DDD OD 00D OD 000000000 DODOD DD O 0 DD 0000 00000000000 NOD aoe Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUUDUD InHDIUDUDHIUDDUDDOL DODO DO DD 0D 00 00D DDD 00000000 DODO DO DD DD 0D 00D DDD 00000000 ODO Dd o o 000000 EPEK EWEA E EELNE EGE tarado da E EE E E DO DD E EE B GREN DDD 00000000 DODO do 00000000 DODO DO DDD 0 DD OD 0000000000000 DODO DO DD DD OD 00D DDD 0D 000000 HOUUUUUUO DODO DO DO DD OD 00D DDD 00000000 DODODO DD 0D ODO 00D DDD 00000000 DODO DO EEE 00 00D DDD 00000000 DODO DO DD 0D OD 00D DDD 00000000 DODO do 000000 100000 DUUUUUIUUDUDUDUUUHU 000 34 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUUDUD 0000000000000000000000 O OHOUOQOUODUUQU0D0DUCUOOO 0000000000 000000000000000 00000000000000000000 0000 HOOHUOUUUUUUOUOUOUUUUUUOO 000000000 10000000U0 DUN DD DN DODO Do ODO DDD OOOO DD 000000000 100 DODO DO DO DDD OOOO DD 000000000 DODO OD OD OD DD OOOO DD 000000000 DODO Dd O DDD 0000000 000
24. DOd0 000000000 000000000 OOOO L OOOO OL 0000000 00000 UU UU 0 UUDUUDUDDUUDDUD UI UU UDDUDD Q000000 0000000 00000000000 Q000000 0000000000000 Q00000000000 00 00 O 0000000000000000 000000000000000000 0000 000000000000000000000000000000 00000000000000000000000000000000 00 0000000 00000000000000000000000000000000000 0000000000090000000000000000000000040 00000000040 00000000000000000000000000000000000 M 001000000000000000000000000000U00000 s Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUUDUD 100 MAA stat A 4 TOR AAA rr 6 A EOS SS e 6 LOETA 10 EGS BS O Rh Te RE eee 29 MERA PEO ELO ENED AUT sp 34 ARANA ANA E aa 38 GEN AA 45 EEK 20812198 194001 ND NAA i atea 58 OA A aenn 58 EEE An 62 HEHEH CEE EAEE E se 71 E E se A 80 BHB BIA RSS Fy HD Ria ee 83 UU 0000D 6 578 800 01 oa Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 1000 00000000000000000000000000 000000000000000000000000000 HUDOUUUODUUUDUUUODUUUCOU OOOU000 0000000 J0000000000000000000 0000000000000000000000000 00000000000000000000000000 0000 DODO Do OD O DDD ODO 0D 0000000000 DODO Do 0D OD DD ODO 0D 0000000000 DODO Dd 0 DDD 0000000 0000000 DODO DO DO DDD OOOO DD 000000000 DODOD DD O DDD OOOO DD 000000000 NOD UUIUIUIUIUDUDUUUUUIUIUDUDUDDUUUUUDUD DODO DO DO DDD OOO 0D 0000000000 DODO Dd DDD 0000000000000 DODOD DD O 0 DD 00000 0000000000 AG Copyright C Toshihito
25. EE Ea EE ESE Geb Oech Eh NESSO DODO Dd 00D 000000000000 DODOD O DO DDD ODO 00D 0000000000 DODOoo00 000000 ABG Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 10000 HE ET DD FTP HOUUUUOO HOUUUUO HULLE EEE EEE EEE EL EEE DODOD DD O DDD ODO 00D 0000000000 DODO DO DO DDD OD 00D 0000000000 DODOD OD O DDD ODO 00D 0000000000 ae Ee ARABE DODO DO DO DDD OOO 0D 0000000000 DODOD ODO DDD OOOO DD 000000000 000000000000000000000000 0000000000000000 ED Eg EHR EH ENE u E S Ee E ELE EEE DEE E E DO DDD OOOO E 000000000 AAN E E E E EEE OOOOOUOOUOUOUOOOUOOOOODOUOUOUOOUUOOUU 14 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 00000000000000000000000000 HOHOUOUOUUUUUUOUOUUUUU 000000000000000000000000 000000000 UUIUIHIUIUDDUUUUUIUUUDDUUUUUUUD JUUIDIHIUUDUUUUUUHUUDDDUDDUU 6 570 86000 0 000000000000000Qq0U00O 1000 UUUUUUUUIUIUUDDUUUU 000 DODO Dd 00D 00 0000000000000 IAID OA E AAA DYE EUE DOBOD OD DO DO DO OD ON DN DN NN O DODO DO O DD OOOO DD 0000000 United States Patent No 6 578 860 Dual function wheelchair Abstract The present invention implements a releasable wheel mounting 15 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD mechanism and a dual braking system to provide a wheelchair that transforms from a conventional wheelchair to a companion wheelchair A set of small rear wheels traditionally found on a companion wheelchair is mounte
26. EGNE EPE H E 00D DDD 00000000 DODO DO DD DD ENE ENE Ek DDD 0D 000000 10000 TIE E EE ED EU ELE EFE ee EG E EA DODO DO DD DD OD 00D DDD 0D 000000 DODODO DO DD 0000 DD DD 00000000 01000 DODODO DD 0D OOO 0D DDD 0D 000000 DODO DO DD DD ODO 00D DDD DD 000000 DODO DO DD DD ODO 0D DDD OD 000000 DODODO DD DD ODO 00D DDD 00000000 1000 HA E EEEE G EREE DEAE E Eee E e E UU 70 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 1000 gon00000000000000000d 000000000000000000000000000 00000000000000000000000000 000000000 00000000000000000000000000 oo0o000000000 0000000000000 1000000000U NOD 1000000000000000000 000000000000000000 00000 onthejob training710000000000000000000 0100000000000000000000000610 00000000000000000000000000 00000000000000000000000000 00000000000 0000000000000000000000000 000000000000000000000000000 80 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 0100000000000000000000000 00000000000000000000000000 00000000000000000000000000 0000000000000 OEE DE CCEA ECE ou HOUUUUUUOOY DODO DO DD DD OD 00D DDD 00000000 DODO DO DO DD ODO 00D DDD 00000000 DODO DO DD DD OD 00D DDD 0D 000000 DODO DO DO DD ODO 00D DDD 0D 000000 UOUUUUO g2B8g098 9000000 000000000000 00000000000000000000000000 DODO Do 0D 000000 Aaa aa EU EF EFE aora E DODO DO 000 DO 00 0D DDD 00000000 DODO Dd O DO DO DO DO 0D 00000000 81 Copyright C Toshihito Yamamoto All Rights Reserved
27. OOOO DD 000000000 duna LE CC GEKE REGE EE EE OEY GP ESE IEEE ERE uE 000000000 000000000000 DADO D OOO DO DO O 0000000 000000000000 DODO DO E DDD OOOO e 000000000 DODOD DD O DDD OOOO DD 000000000 EPE ERO ENE ASEYE DD OOO 0D 0000000000 NOD bi EEO Ce Bo ee eo Oo ee HOUUUUO DODO Do OD O DDD OOOO DD 000000000 DODOD ODO DDD ODO 00 DD 000000000 54 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD UUIUIUUUDUUUDUUUIUDUUUUDUDUUUUU 000000000000000000000000 UO0OO0dOa0o0coggano EEE TE EE EEEE CEEE BERRE DD 000000000 ELE IH EKEKO ENA FED E EEE GE EFE EI EE UUIDIHIUIUDUDDUUUUUIUIUDDUUUUUUUD DOOOO 0d 00D 0 000000 000000000 UUIUIHIUIUDUDUUUUUIUIUDDUUUUUUUD UUIUIHIUIUDUDUUUUUIUUDDUUUUUDUUD DODO Dd DDD 0000000000000 00000000000000000000000000 PH EIEH EA EE DH EF CHEI Ll 02000000000000000000000 00000 EEEN EREK ESEE EEDD FO ELE EF EIEH EIEH O0C0000000000d00000000000oc0o HOUUUUUUUOUUY 55 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDDUD 10000 DODOD ODO DDD OOOO DD 000000000 DO DO DO DO DD DO OD OD NN DD DD UNO O LIEF EDD EN Ed EI Eh aaa EE EKE DODO Dd 00D DO 0000000 0000000 10000 DOd DD OD 00D 0000000000 DODOD OD O DDD ODO 00D 0000000000 DODOD O DO DDD OOOO DD 000000000 UU DODO DO OD O DDD OOO 0D 0000000000 HOUUUUUOO EDD EEG GME EEE ERE ESE dada ED EL ED DODO Do OD 0 00 0000000000 DODOD ODO DDD 0000 DD 000000000 DODO Dd O DD O DO DO 000000000000 56
28. OUOUOUOOUOUODUOUOUOUUOU DODODO DD DD OOO 0D DDD OD 000000 01000 100000 DUUUUUUUUDDUUUUUDU O NDN NUN NDN OOUOUOUOOUUOU DODODO DD 000000000 DAD DOO 2119510 a 3735 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD DODO Dd DDD O DO 000000000000 DODO OD DD O DDD OOO 0 DD 000000000 UUIUIUUUUDUDDUUDUIUDUUUIUDUDUUUDOUU 14313 EI ERE EEE HED BC EIEH ELE EE EF EEE ondaa EFO EHE EEE 100000000 NUNO DD NOO DODO DO DO DDD OOOO DD 000000000 CA ata DO O00000d0d0d0 do gd god oo DD DN OO DODO Dd 00D 0000000 0000000000 00000000000 000000000000000 JUUIDIHIUIUDUUUUUUUUUDDUUUUUUUD HENEN E EEDD EEE ECE EU andanada EI ET El DODOD ODO 0D 0000000000 74 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD UUIDIHIUHUDDDUUUUUIUIUDUDDDUUUDUDUDUD ED EE ELE E E ET EE Et RE EE doi LE BE BEEF BY ET Bd SABE EEE S E E EEE JUIUIHIUIUDUDUUUUUDUD 0000000000000000000000O DOdO do oO O O 0000000000 DABA da Do OOO OD 0000000 N0000000000000000 DODOD ODO DDD OOOO DD 000000000 JUUIUIUIUDUDUDDUUU DODOD DD O DDD OOO 0 DD 000000000 DODOD OD O DDD 000000000000 UD E OA EU EEE DODO DO OD 00 DD OO 0000000000000 HEE HEEE EEE e E EIEH EEE EE E EEE OOOOOUOOUOUOUOOOUOOOOODOUOUOUOOUUOOUU 75 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 10000 DUUDUDUUUHUDDUUD 00000000000000000000000000 gg 2828 DO DO DO DO 0000000 DOBd O 000000000 00000000 00000 NODDODo000000000000000
29. Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 000000000000000uunullun 0000000000000000000 DODODO DD DD OD 00D DDD 0D 000000 oooo0ooo00000 00000000000 00000000 DODO DO DO 0 DD 00 00D DDD 00000000 DODO DO DD DD ODO 00D DDD 00000000 DODO DO DDD OOOO DDD 0000000 DODO DO DD DD OOOO DD DD 0D 000000 DODO DO 00 DD ODO 00D DDD DD 000000 10000 DODO DO DD DD ODO 00D DDD 00000000 DODODO DD DD OOOO DB DDD 0D 000000 DODODO DO 0D ODO EPEE DDD 00000000 DODO DO DD DD OD 00D DDD 0000000 DODODO DD DD OOO 0D DDD 00000000 DODO DO DDD 000000000000 30 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD DODO DO DO DDD OOOO DD 000000000 HOUUUUUUUOO DODO DO DO DDD OOOO DD 000000000 DODO OD DD O DDD OOO 0D 0000000000 119131 EEE DODOD ODO DDD OO 00D 0000000000 DODO Dd DDD DO DO 000000000000 DODO DO DO DDD OOOO DDD 00000000 DODO Dn OD O 0 DD ODO 0D 0000000000 LEFEL END DODO DO DO DDD OD 00D 0000000000 HOUUUUO 00000000000000000000000000 00000000000000000000000000 0000000000000 O O0g0dd0o 0000000000000 0000000 EU Copyright C 7oshihito Yamamoto All Rights Reserved UUDUDUDDUUDUD 0 000000000000000000000000 DO DODO DO DD DD ODO 00D DDD 00000000 0020000888900 0000000000000 000 DODO DO DO 0 DD ODO EEEE 0000000000 DODOo 0d 00D 0000000 DODO Do 0 DO 0 DD ODO 00D 0000000000 DODO DO DO DDD ODO 0 DD 000000000 DODO Do ODO DDD OOOO DDD 00000000 DODOD DD O DDD OO 00D 0000000000 HOUUUUO DO
30. aking force to the large wheels when the chair is in the conventional mode and a cable connection allows the same lever to actuate a similar braking operation on the small wheels in the companion mode Thus the present invention provides a wheelchair that easily converts from a companion mode to a conventional mode and offers a unique single lever braking system that operates in both modes 48 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 100000 UDUUUUUIUHUDDODDDUUUUDUD Juno DODO DO DD O DDD ODO OD 0000000000 DODOD OD 00 DD O 0000000000 SEE ENEP E BA EEE EE DODO DO 0D 00000000 DODO DO DO DDD OOOO DD 000000000 DODOD OD O DDD OD 00 DD 000000000 DODO DO DO DDD OOOO DD 000000000 DOO OOO DODO Dd DDD O DO 000000000000 00 PODENDO UPE DODO DO DO DDD OOOO DDD 000000000 AO E EEK GEM ELE EL E Eh i DODO DO DO 0 DD OD 00D 0000000000 DODO Do OD OD DD OOOO DD 000000000 49 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD DODO OD DD O DDD OO 00D 0000000000 1000 DODOD ODO DDD OOO OD 0000000000 DO BO DO DO DD DO OD ODO 0000000000 HEVE EE EDD EN EEG Eh ES TE EEE DODO 0 Dd 0D O DO DO 000000000000 DODO DO DO DDD OOOO DD 000000000 DODO DO DDD DDD O 000 00000000000 DODO Do OD O DDD ODO 0D 0000000000 100000 EEE EEE DODO Do 0D 00000000 DODO DO DO DDD OD 00 DD 000000000 OEE ECE EP LOE aaa rara HOUUUUUUUO 50 Copyright C Toshihito Yamamoto All Rights Reserved
31. amoto All Rights Reserved UUDUDUDDUDUD 160 As can be appreciated the wheelchair of the present invention converts easily and rapidly from a conventional wheelchair to a companion wheelchair by simply removing the large wheels that provide the occupant with a mode of propulsion To facilitate the transition between the two modes a braking system has been developed that operates in either mode to arrest the motion of the wheelchair or prevent the wheelchair from moving while the brake is set The present invention solves the problem encountered by those who would like to own both a conventional wheelchair and a companion wheelchair without having to purchase two separate wheelchairs Those skilled in the art will appreciate that various adaptations and modifications of the just described preferred embodiment can be configured without departing from the scope and spirit of the invention Therefore it is to be understood that within the scope of the appended claims the invention may be practiced other than as specifically described herein What is claimed is 24 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 1 A wheelchair having a set of front wheels and a first set of rear wheels generally having the same diameter as the set of front wheels operatively attached to a frame and further comprising a second set of rear wheels having a diameter substantially larger than the first set of rear wheels the
32. as the set of front wheels operatively attached to a frame and further comprising a second set of rear wheels having a diameter substantially larger than the first set of rear wheels the first and second set of rear wheels are both rotatably attached to the frame for simultaneous movement with the wheelchair 10 15 20 25 30 35 40 45 50 55 60 4 the second set of rear wheels is removable mounted on said wheelchair whereby the wheelchair is configured as a companion wheelchair further comprising a braking system for applying a bracking contact to both the first set of rear wheels and the second set of rear wheels the braking stem actuated by a lever mounted on the wheelchair 2 The wheelchair of claim 1 wherein the braking system comprises a first pivoting member coupled to said lever for applying direct pressure to said second set of rear wheels and a cable connected to the first pivoting member for controlling a second pivoting member that applies direct pressure to said first set of rear wheels 3 The wheelchair of claim 2 wherein the braking system further comprises a spring to bias the second pivoting member in a non braking condition 4 A convertible wheelchair having a frame unit for supporting a seat comprising a pair of front wheels operatively connected to the frame unit a first set of rear wheels operatively connected to the frame unit a second set of rear wheels larger in diameter t
33. d on the rear of the chair along with a means for removably mounting a set of large wheels When the large wheels are removed the chair reverts to a companion chair having handles on the rear of the chair for steering by a second person With the large wheels mounted on the chair the chair serves as a conventional wheelchair capable of being steered and propelled by the chair s occupant To enable the dual nature of the chair the present invention employs a braking system that allows the chair to be stopped by the occupant in either mode A mechanical lever system applies a braking force to the large wheels when the chair is in the conventional mode and a cable connection allows the same lever to actuate a similar braking operation on the small wheels in the companion mode BACKGROUND OF THE INVENTION 1 Field of the Invention The present invention relates generally to wheelchairs and in 16 Copyright C 7oshihito Yamamoto All Rights Reserved UUDUDUDDUDUD particular to a dual function wheelchair that serves as both a conventional wheelchair and a companion wheelchair 2 Description of Related Art Wheelchairs traditionally are categorized as being of one of two types a conventional wheelchair and a companion wheelchair A conventional wheelchair has two large rear wheels that allow the occupant of the chair to propel himself by placing his hands on the two large wheels and rotating the large wheels A companion whee
34. e best modes contemplated by the inventor of carrying out his invention Various modifications however will remain readily apparent to those skilled in 19 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD the art since the general principles of the present invention have been defined herein specifically to provide a dual finction wheelchair with a single actuator braking system FIG 1 is an elevated perspective view of the present invention in its conventional mode That is two large rear wheels 100 are mounted on the chair 105 that allow the occupant of the chair to reach over the armrests 110 and grasp the wheels rim 115 and push on the wheels 100 Pushing both wheels at once causes the wheelchair 105 to move forward in a well known manner while moving the left or right wheel more than the other will cause the wheelchair to turn Other components of the wheelchair such as the back support 120 seat 125 front wheels 130 and front wheel supports 135 are conventional components that do not reguire further elaboration for an understanding of the present invention FIG 1 also illustrates a second set of rear wheels 140 that are of similar diameter and size to the front wheels 130 as is typical of companion wheelchairs The small rear wheels 140 are supported on the frame 145 of the wheelchair 105 at rear brackets 150 It is contemplated that the small rear wheels 140 remain attached to the wheel chair 105
35. ed UUDUDUDDUDUD the greater the force of the lateral projection 190 on the wheel 100 until the wheel is either brought to a complete stop or prevented from rotating as may be necessary on an inclined surface If the braking lever 160 is pivoted backward the lateral projection 190 is retracted thereby releasing the rear wheel 100 In this manner the wheelchair 105 is braked while in the conventional mode The second pivoting brake member 175 is also connected to a cable 195 having an outer sheath mounted on the bracket 170 Moving the braking lever 160 and the accompanying movement of the second pivoting brake member 175 causes the cable 195 to be pulled through the sheath The opposite end of the cable 195 is connected to a first pivoting brake 200 mounted adjacent the small rear wheel 140 Aspring 215 is provided to bias the first pivoting brake 200 ina non contact position However when the cable 195 is actuated by the braking lever 160 the portion of the first pivoting brake 200 is rotated by the cable 195 causing a complementary movement of the other end of the first pivoting brake 200 through the pivot pin 205 The end of the first pivoting brake 200 includes a lateral projection 210 that contacts the small rear wheel 140 when the first pivoting brake 200 is actuated The spring 215 returns the first pivoting brake 200 to the non contact position when the force is removed from the braking lever HG Copyright C Toshihito Yam
36. ghts Reserved UUDUDUDDUDUD the companion mode A braking lever 160 positioned at the forward portion of the frame 145 near each hand is shaped to permit easy grasping by a user and pivots forward and backward via a pin 180 that secures a braking lever 160 to a bracket 170 A second pivoting member 175 is mounted adjacent the braking lever 160 by a pin by a pin 165 The rotation of the braking lever 160 is coupled to the rotation of the second pivoting member 175 by a connecting bar 185 such that a rotation of the braking lever 160 in the clockwise direction Causes a corresponding rotation of the second pivoting member 175 in the same direction As explained below the rotation of the second pivoting member 175 causes a contact member to apply direct pressure to the rear wheels of the chair whether the chair is operating in conventional or companion mode When the chair 105 is operating in conventional mode a lateral projection 190 on the second pivoting brake member 175 normally resides adjacent to the large rear wheel 100 In this position the wheel turns unhindered by the lateral projection 190 However when the braking lever 160 is pivoted forward the second pivoting brake member 175 rotates in a manner that moves the lateral projection 190 into the path of the rear wheel 100 causing contact with the wheel The more force that is applied to the braking lever 160 by the user 22 Copyright C Toshihito Yamamoto All Rights Reserv
37. han the first set of rear wheels is operatively connected to the frame unit and removably connected to the frame unit and a braking system operatively connected to the frame unit having a handle unit positioned on the frame unit for grasping by the user a first brake member for contact with the first set of rear wheels and a second brake member for contact with the second set of rear wheels whereby moving the handle unit simultaneously applies the first brake member to the first set of rear wheels and the second brake member to the second set of rear wheels when the second set of rear wheels are mounted on the frame unit 5 The convertible wheelchair of claim 4 wherein the first brake member is pivotally connected to the handle unit and the second brake member is connected to the first brake member by a cable the second brake member is pivotally connected to the frame unit 6 The convertible wheelchair of claim 5 wherein the braking system further comprises a spring member to bias the second brake member to a non braking condition 7 The convertible wheelchair of claim 6 wherein the pair of front wheels and the first set of rear wheels have approxi mately the same diameters 8 The convertible wheelchair of claim 5 wherein the handle unit includes a lever pivotally mounted on the frame unit one end of the lever is configured for grasping by a user and the other end is pivotally attached to a connecting bar with the pivotally mount
38. having a handle unit positioned on the frame unit for grasping by the user a first brake member for contact with the first set of rear wheels and a second brake member for contact with the second set of rear wheels whereby moving the handle unit simultaneously applies the first brake member to the first set of rear wheels and the second brake member to the second set of rear wheels when the second set of rear wheels are mounted on the frame unit 5 The convertible wheelchair of claim 4 wherein the first brake member is pivotally connected to the handle unit and the second brake member is connected to the first brake member by a cable the second brake member is pivotally connected to the frame unit 26 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 6 The convertible wheelchair of claim 5 wherein the braking system further comprises a spring member to bias the second brake member to a non braking condition 7 The convertible wheelchair of claim 6 wherein the pair of front wheels and the first set of rear wheels have approximately the same diameters 8 The convertible wheelchair of claim 5 wherein the handle unit includes a lever pivotally mounted on the frame unit one end of the lever is configured for grasping by a user and the other end is pivotally attached to a connecting bar with the pivotally mounting of the lever on the frame unit positioned between the respective ends of the lever the connect
39. ights Reserved UUDUDUDDUDUD UUIUIHIUHUDUDUUUUDUHIUUDUUUUUDUD IUIUIHIUHUDUDUUUUUIUIUDDDDUUUDUDUDUD 10000 DUDUUUUUIUHUDDODDUDUUDDUDUDUD UUIUIHIUIUDUDUUUUUIUIUDDODUUUUDUDUD DODO Dd 0 DDD DO 000000000000 DODOD DD O DDD ODO 00D 0000000000 DODODo e 0 0000000000 DODO Do ODO 0 DD OD 00D 0000000000 DODOD ODO DDD OOOO DD 000000000 HOUUUUUO DODO Do DD O DDD OOO E 0000000000 EDD EFE ELE EREE s BB BD EEF EE ED EF BET ELE ED EE Ge GME EE EE E ES EME ELE DODOo Do Dd DD O DO DO 000000000000 NDN NN NDN DD DN UU 47 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD The present invention implements a releasable wheel mounting mechanism and a dual braking system to provide a wheelchair that transforms from a conventional wheelchair to a companion wheelchair A set of small rear wheels traditionally found on a companion wheelchair is mounted on the rear of the chair along with a means for removably mounting a set of large wheels When the large wheels are removed the chair reverts to a companion chair having handles on the rear of the chair for steering by a second person With the large wheels mounted on the chair the chair serves as a conventional wheelchair capable of being steered and propelled by the chair s occupant To enable the dual nature of the chair the present invention employs a braking system that allows the chair to be stopped by the occupant in either mode A mechanical lever system applies a br
40. ing bar is pivotally mounted to the second brake member at one end of the second brake member and the cable is connected at the other end of the second brake member the cable is spring mounted to the first brake member to bias the first brake member away from the first set of rear wheels aaa EWCH EI EIEH EIEH EEE UUIDIHIUIUDUDUUUUUIUIUDDDDUUDDUUUD EDD ET BAF EFE 27 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD DODO DO DO DDD OOO 0D 0000000000 Wat is cl ai ned is 0000000000000000 DODO Do OD O DDD OO 00D 0000000000 DODO Do O DO DDD 00000000000 00000000000000000000000000 000000000000000000000000 CE EE AEA 00000000000000000 OOOOOUOUUQOQUDUODUOCODUODUO OOOUOUUOUOUUUUUODOUUUOUUOUOU JODODOOODOCO 00000000000000000000000000 00000000000000000000000000 00000000000000000000000000 DOOOUWUWUUUUUUUUUUUUUO 000000000000000000000000 28 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUUDUD InHIUDUDHUDDWD DODO OD DD O 0 DD ODO 00D 0000000000 DODO Do OD O 0 DD OOOO DD 000000000 DODO DO DO DDD OOOO DD 000000000 DADO Dd 00D DO 000000 00000000 DODO DO ODO DO DO OO OD 000000000000 UUIDIHIUIUDUDUUUUUIUIUDDUUUUUUUD DODOo do oo 000000 DODOD ODO DDD OOO 0D OD 00000000 DODO DO DO DDD OOOO DDD 00000000 NOD non0000000000000000000 d0 0000000000000 00000 J00 000000000000000 0022888890000 00000000000 12221822 EL ELE EF ELE ETEL ELE nn naan na nn anna an a an 29 Copyright C
41. ing of the lever on the frame unit positioned between the respective ends of the lever the connecting bar is pivotally mounted to the second brake member at one end of the second brake member and the cable is connected at the other end of the second brake member the cable is spring mounted to the first brake member to bias the first brake member away from the first set of rear wheels
42. l Rights Reserved UUDUDUDDUDUD 10000000U00 Dodo od Dg 0 00000000 LD boh BERETE A e EKE aa DODOoo0 0000000 DODO DO DD O DDD OO DD 000000000 UU DODO DO DO DDD OOOO DD 000000000 AEE EEE SOUND 1000000000000000000 000000000040U0000000 E ig Sg ESE OOO OUOUOOUOUOUOOUOOUOOOOUOUODOUODOUOUUOU NDN do 000000 UUUDDUUUUUUUD NOODODOD000000000000000 T00 000000000000000 000 66 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD NN do 0 o 00000 DON DD NOO DODO Dd DDD O DO DO 000000000000 DODOD ODO DDD OOOO DD 000000000 O0C0000000d0d Doo od Dg 0d 00000000 DODO Dd 0d EEEE DO DO 000000000000 00000000000000000000000000 00000000000000000000000000 100000000000000000000000 00000000000000000000000000 DO DODODO DD 0D OD 00D DDD OD 000000 DODO DO DO 0 DD OD 00D DDD 0D 000000 DODO DO OD 00D ODO 00D DDD 00000000 DODO DO DD 0D 0000000000 DODO DO DD 0D OD 00D DDD 00000000 Ata EFYDD EI ELE ED EE EWE O0000000d0d00d000000000000do 100000 d0000 67 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD FIG 1 is an elevated perspective view of the present invention in its conventional mode That is two large rear wheels 100 are mounted on the chair 105 that allow the occupant of the chair to reach over the armrests 110 and grasp the wheels rim 115 and push on the wheels 100 Pushing both wheels at once causes the wheelchair 105 to move forward in a well known manner while moving the left or
43. lchair has two small rear wheels that do not allow the occupant to steer or propel the wheelchair Instead the companion wheelchair includes handles on the rear of the chair that permits a second person or companion to push and steer the wheelchair Companion wheelchairs because they lack a large rear wheel are easier to fold up and store away and are used freguently when travel is reguired Those who use a companion wheelchair are typically forced to purchase both types unless one is never in need to drive one s own chair There are many people that could benefit from a companion wheelchair but cannot afford the expense of two wheelchairs and must make do with a conventional wheelchair 17 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD SUMMARY OF THE INVENTION The present invention implements a releasable wheel mounting mechanism and a dual braking system to provide a wheelchair that transforms from a conventional wheelchair to a companion wheelchair A set of small rear wheels traditionally found on a companion wheelchair is mounted on the rear of the chair along with a means for removably mounting a set of large wheels When the large wheels are removed the chair reverts to a companion chair having handles on the rear of the chair for steering by a second person With the large wheels mounted on the chair the chair serves as a conventional wheelchair capable of being steered and propelled by the chair
44. resent invention implements a releasable wheel mounting mechanism and a dual braking system to provide a wheelchair that transforms from a conventional wheelchair to a companion wheelchair A set of small rear wheels traditionally found on a companion wheelchair is mounted on the rear of the chair along with a means for removably mounting a set of large wheels When the large wheels are removed the chair reverts to a companion chair having handles on the rear of the chair for steering by a second person With the large wheels mounted on the chair the chair serves as a conventional wheelchair capable of being steered and propelled by the chair s occupant To enable the dual nature of the chair the present invention employs a braking system that allows the chair to be stopped by the occupant in either mode A mechanical lever system applies a braking force to the large wheels when the chair is in the conven tional mode and a cable connection allows the same lever to actuate a similar braking operation on the small wheels in the companion mode Thus the present invention provides a wheelchair that easily converts from a companion mode to a conventional mode and offers a unique single lever braking system that operates in both modes BRIEF DESCRIPTION OF THE DRAWINGS The exact nature of this invention as well as its objects and advantages will become readily apparent upon refer ence to the following detailed description when considered in
45. right wheel more than the other will cause the wheelchair to turn Other components of the wheelchair such as the back support 120 seat 125 front wheels 130 and front wheel supports 135 are conventional components that do not require further elaboration for an understanding of the present invention UUIUDIUIUIUDUUUUUUUIUUDUDDUUUUUDUUD DODO DO DO DDD DO DO O DDD 00000000 DODOD DD 0000000000 FIG 1 is an elevated perspective view of the present invention in its conventional mode That is two large rear wheels 100 are mounted on the chair 68 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD 105 that allow the occupant of the chair to reach over the armrests 110 and grasp the wheels rim 115 and push on the wheels 100 Pushing both wheels at once causes the wheelchair 105 to move forward in a well Known manner while moving the left or right wheel more than the other will cause the wheelchair to turn Other components of the wheelchair such as the back support 120 seat 125 front wheels 130 and front wheel supports 135 are conventional components that do not reguire further elaboration for an understanding of the present invention DODO DO DD 0D 00 00D DDD 00000000 DODO Do 000000000 00000000000000000000000000 no000000000000000000000 00000000 0000000000000000000000048 4 69 Copyright C Toshihito Yamamoto All Rights Reserved UUDUDUDDUDUD Ada da o o oa ooo ado 0000000 pgod0
46. wheel be securely fastened when in operation without unduly hindering the rotation of the wheel with surplus friction that would hinder the operation of the chair while allowing the wheel to be removed without undo effort FIG 2 further illustrates a unique braking mechanism that permits the occupant of the chair to decelerate or hold stationary the wheelchair using a hand operated braking system in either the conventional or the companion mode A braking lever 160 positioned at the forward portion of the frame 145 near each hand is shaped to permit easy grasping by a user and pivots forward and backward via a pin 180 that secures a braking lever 160 to a bracket 170 A second pivoting member 175 is mounted adjacent the braking lever 160 by a pin by a pin 165 The rotation of the braking lever 160 is coupled to the rotation of the second pivoting member 175 by a connecting bar 185 such that a rotation of the braking lever 160 in the clockwise direction causes a cor responding rotation of the second pivoting member 175 in the same direction As explained below the rotation of the second pivoting member 175 causes a contact member to apply direct pressure to the rear wheels of the chair whether the chair is operating in conventional or companion mode US 6 578 860 B1 3 When the chair 105 is operating in conventional mode a lateral projection 190 on the second pivoting brake member 175 normally resides adjacent to the large rear wheel 100
47. y found on a companion wheelchair is mounted 52 U S Cl i 280 2501 280 242 1 on the rear of the chair along with a means for removably 188 2 D 188 2 F 188 24 16 188 24 21 mounting a set of large wheels When the large wheels are j magi a removed the chair reverts to a companion chair having a PERO em OD ra eo handles on the rear of the chair for steering by a second E TT 24 21 person With the large wheels mounted on the chair the chair serves as a conventional wheelchair capable of being steered 56 References Cited and propelled by the chair s occupant To enable the dual nature of the chair the present invention employs a braking U S PATENT DOCUMENTS system that allows the chair to be stopped by the occupant 4 098 521 A 7 1978 Ferguson et al 280 247 in either mode A mechanical lever system applies a braking 4362311 A 12 1982 Bergman 280 250 1 force to the large wheels when the chair is in the conven 4 570 756 A 2 1986 Minnebraker et al 188 2 F tional mode and a cable connection allows the same lever 4 643 446 A 2 1987 Murphy et al 180 11 to actuate a similar braking operation on the small wheels in 4 759 418 A 7 1988 Goldenfeld et al 180 65 1 the companion mode 4 768 622 A 9 1988 Nicklasson et al 188 2 D 4 805 931 A 2 1989 Slasor 280 250 1 8 Claims 2 Drawing Sheets US 6 578 860 B1 Sheet 1 of 2 Jun 17 2003 U S Patent
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