Wheel Chair With Automatic Breaking

摘要

A wheel chair with several new and useful features is provided. Those new and useful features provide the wheel chair with enhanced lateral stability, automatic cocking of an automatic locking device whenever an occupant sits in the wheel chair, and a holding mechanism that enables the wheel chair to be freely wheeled about when there is no occupant, and automatically move to a cocked state as soon as an occupant sits on the chair. The result is an automatic locking system for a manual wheelchair that unlocks the wheels for intentional motion when the chair is occupied, and locks the wheelchair wheels immediately when it is unoccupied, yet in no way interferes with the typical locking mechanism of the standard manual wheelchair when so desired.

主权项

1. A wheel chair having a pair of chair rails and a pair of seat rails, each of which is oriented on top of a respective chair rail, the pair of seat rails supporting a seat for an occupant of the wheel chair, the pairs of seat and chair rails being spaced apart when the wheel chair is in an open condition and being moveable toward each other to enable the wheel chair to be collapsed to a folded condition, each pair of seat and chair rails having respective first ends that can separate from each other, at least one pair of the seat and chair rails being biased to an orientation where their first ends are separated from each other, the first ends of the pair of seat and chair rails being automatically moveable against their bias and toward each other when a wheelchair occupant sits on seat supported by the seat rails, and the first ends of the pair of seat and chair rails being automatically moveable under the bias to a separated position when a wheelchair occupant starts to rise from the seat, an auto locking mechanism including a brake that automatically locks a wheel of the wheel chair against movement when the first ends of the pair of seat and chair move under the bias to a separated position, and automatically unlocks the wheel when a wheelchair occupant sits on the seat and causes the first ends of the seat and chair rails to move toward each other against the bias, the second ends the pair of seat and chair rails having predetermined positions relative to each other and a lock mechanism that maintains the second ends of the pair of seat and chair rails in the predetermined positions relative to each other during all relative movements of the first ends of the seat and chair rails relative to each other, the lock mechanism being selectively releasable to allow the pairs of seat and chair rails to move upwards together toward each other when the wheelchair is being collapsed.