| 摘要 |
A power assist device for a wheelchair comprising a body, a drive wheel connected to said body and being movable between a raised position and a lowered surface engaging position, attachments for securing said body to said frame, a first motor for driving said drive wheel at least when said drive wheel is in the lowered surface engaging position, a second motor connected to the drive wheel for raising and lowering said drive wheel, a biaser, for biasing said drive wheel into surface engaging driving contact, a manually initiated electronic controller for controlling said power assist device, and a source of electrical power.
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