Patent ID: 6845996
Filing Date: 2005-01-25
Classification: A61G,Y10S

Abstract:
1. A shock absorber for a power wheelchair having a frame, an electrical drive assembly and a pair of rear wheels, where the electrical drive assembly is mounted in the frame and has a drive shaft with two ends respectively extending out of the electrical drive assembly, and the rear wheels are respectively attached to and driven by the ends of the drive shaft; the shock absorber comprising a seat having a bracket pivotally connected to the connecting ring on the base to pivotally connect the base to the bracket and having a top, a bottom, a front end, a rear end and two opposite sides, the top of the bracket adapted to attach to the frame of the power wheelchair and the bracket further having a suspension device mounted between the bottom of the bracket and the top of the base and the suspension device comprising wherein the spring stiffness of the front suspension spring is less than the spring stiffness of the rear suspension spring.