Transmission for wheelchair

A transmission for a wheelchair which is installed on a frame for said wheelchair, and for selecting and driving said wheelchair in manual and motor-driven ways, said transmission comprising:

• a transmission unit installed on said wheelchair, for driving said wheelchair;
• a clamping unit for fixing said transmission unit on said wheelchair;
• and
• a switching unit for switching said wheelchair in the manual and motor-driven ways;
• wherein said transmission unit comprises,
• driving rollers coupled to accelerating and decelerating parts connected to motors on the both sides of the interior of a casing, for driving both wheels, and
• a controller circuit-connected to said motors, a motor control circuit unit and a battery, for adjusting said transmission unit,
• wherein said switching unit comprises,
• a fixing clip assembled by means of said clamping unit with said casing of said transmission unit and having a locking projection locked or unlocked to/from a locking hole of a fixing part fixed on said frame of said wheelchair,
• a locker elastically coupled with first and second springs on the top and bottom portions of the interior of said fixing clip and for pulling, upward by means of a handle,
• said locking projection elastically protruded on the both sides of said locker, respectively and locked or unlocked to/from said locking hole of said fixing part,
• a first pulling string connected to a push button elastically installed by means of a third spring on said handle, for pulling said locker with said locking projection by the pressing operation of said push button, to thereby isolate said driving rollers on the both sides of said transmission unit from said wheels, and
• a ratchet for controlling the manipulation of said handle by means of a stopper connected by a second pulling string to said push button of said handle.