Wheelchair with a pivoting back, seat and leg supports

摘要

A wheelchair includes a base with two pairs of wheels connected to two sides of the base. A seat is connected to the base and a backrest is connected to the rear end of the seat. A seat shaft is located below the seat and a backrest supports the backrest. Two identical transmitting systems are connected between the seat shaft and the backrest shaft, wherein the seat shaft is driven by a motor. Each of the seat shaft and the backrest shaft has a rotatable member and a fixed member co-axially mounted to one of two ends thereof. A connecting tube is connected between the rotatable member on the seat shaft and the fixed member on the backrest shaft. Each of the rotatable member and the fixed member has arciform slots defined therein so that a chain is engaged with the arciform slots and passing through the connecting tube. The seat can be pivoted to an upright position to assist the disable person to stand up by rotating the rotatable members.