The present invention provides a wheelchair with direction switching function, which is to configure a direction switching mechanism between two rear wheels of a wheelchair body. The direction switching mechanism may control the two rear wheels for synchronously switching direction. The direction switching mechanism comprises two driving arms, two ratchet units, and two cams, in which the ratchet unit include a ratchet and two pawls and the cam is provided with two symmetrical flanges. The two ratchets respectively penetrate through shafts of the two rear wheels. The two driving arms are respectively located above the two ratchets and connected with the two cams. The two driving arms are interconnected. The two flanges of each cam evenly abut the two pawls. A rider may pull one of the driving arms in the counterclockwise or clockwise direction, such that he two driving arms may simultaneously drive the two cams to rotate toward the pulling direction. The flange opposite to the pulling direction may leave the pawl abutted thereby, so that a free end of the pawl may lower to contact with the ratchet and the ratchet may only rotate toward a specific direction. Thus, the present invention may control the traveling direction of the rear wheels, so that the wheelchair will not move backward due to gravity while going uphill.一種具有換向功能之輪椅,主要是在一輪椅本體的兩後輪之間設有一換向機構,該換向機構可控制兩後輪同步換向。換向機構包括兩驅動臂、兩棘輪組、兩凸輪,該棘輪組包括一棘輪與兩棘爪,該凸輪具有兩對稱的凸緣。該兩棘輪分別穿設在兩後輪的轉軸上,該兩驅動臂分別位於該兩棘輪上方,並分別連結該兩凸輪,該兩驅動臂之間相連,每一凸輪的兩凸緣平均抵頂兩棘爪。由乘坐者以逆時針或順時針方向扳動其中一驅動臂,兩驅動臂會同時帶動兩凸輪朝扳動方向旋轉,相反於該扳動方向的凸緣會離開所抵頂的棘爪,使該棘爪一自由端下垂並與棘輪接觸,使該棘輪只能朝特定方向旋轉,藉此來控制後輪行進的方向,使輪椅行經上坡時,不會因重心而往後退。10...換向機構100...輪椅本體101...後輪102...手剎車機構103...手剎車機構
