Anti-turnover mechanism of electrical wheelchair
AssigneePihsiang Machinery Mfg. Co.
InventorDonald P. H. Wu
Life of this patent
Estimating the term…
Abstract
An electrical wheelchair includes a chassis to which a frame is pivotally mounted. Two casters are rotatably mounted to the frame. At least a resilient member is arranged between the frame and the chassis for supporting the relative position of the frame with respect to the chassis. The resilient member can be deformed to change the relative position of the frame with respect to the chassis to allow the wheelchair to climb over raised surfaces of different heights. The deformation of the resilient member also stores energy therein which may be released when the wheelchair is about to reach the raised surface for enhancing the wheelchair to move over the raised surface. Further, the resilient member also functions to absorb shock caused by the wheelchair moving down a step-like raised surface.
Claims18
An electrical wheelchair comprising:
- a chassis to which wheels are mounted, the chassis comprising two L-shaped rods, each said rod comprising a first section extending from the chassis and a second section vertically extending from the first section, with a cross bar fixed between the second sections of the rods, the resilient member being mounted between the cross bar and the frame, and
- an anti-turnover mechanism comprising:
- a frame pivoted to the chassis,
- casters rotatably mounted to the frame, and
- a resilient member mounted between the frame and the chassis for supporting relative position of the frame with respect to the chassis while allowing the relative position to be changed by deformation of the resilient member caused by relative rotation of the frame with respect to the chassis.
An electrical wheelchair comprising:
- a chassis to which wheels are mounted, and
- an anti-turnover mechanism comprising:
- a frame pivoted to the chassis,
- casters rotatably mounted to the frame,
- a resilient member mounted between the frame and the chassis for supporting relative position of the frame with respect to the chassis while allowing the relative position to be changed by deformation of the resilient member caused by relative rotation of the frame with respect to the chassis, and
- a means for pre-loading the resilient member comprising a bolt threaded into an inner-threaded hole defined in the chassis, the bolt having an expanded end portion physically engaging a movable member, the resilient member being arranged between the frame and the movable member, distance between the movable member and the frame being adjustable by rotating the bolt to move the movable member with respect to the frame to pre-load the resilient member.
Dependencies are inferred from the claim text.