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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0581863 (1990-09-13) |
발명자 / 주소 |
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출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 23 인용 특허 : 0 |
A wheelchair is provided with a multiple speed hub, each including a self-contained shifting mechanism for selectively changing gears. The hubs include both coasting and braking features and are controlled by drive rings mounted concentric with the wheelchair rear wheels. The mechanism permits hands
In a wheelchair designed to be manually operated by a wheelchair user, the wheelchair having a frame for supporting a pair of first ground-engaging wheels and a pair of second ground-engaging drive wheels, each of the second wheels being mounted for forward and reverse rotation on a coaster hub, the
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