Patent ID: 8684396

Claim:
An adjustable wheelchair comprising: a push handle assembly configured to serve as a wheelchair back frame; a seat assembly, and a mobility base; the mobility base having: a rear axle for supporting a pair of spaced apart rear wheels; a front axle for supporting at least one front wheel; a pair of side bottom struts each having an end movably connected to the rear axle and an opposite end fixedly secured to the front axle; a pair of upwardly and rearwardly extending forward struts each having one end pivotally secured to the front axle; a pair of upright members mounted to the rear axle at opposite ends of the axle; a pair of selector plates each pivotally mounted to a respective upright member at an upper end thereof; each selector plate is adjustable and has a pair of valleys provided at a bottom edge thereof; a movable latch bar extending between the pair of selector plates and movable from a position within the valley to a position outside the valley; a resilient means for urging the latch bar into a valley; a foot operable actuator member; an over-center assembly means connected to the actuator member and movable latch bar for moving the latch bar under control of the actuator member into a valley on one side of center with the urging of the resilient means and moving the latch bar under control of the actuator member outside a valley on the other side of center against the urging of the resilient means; means for pivotally moving the pair of selector plates to a position where the latch bar is positioned to enter a selected valley; and a pair of seat mounting plates each of which are fixedly mounted to a respective selector plate; the push handle assembly having a pair of parallel and opposed side frame members with each side frame member having an end fixedly mounted to a respective selector plate and fixedly mounted to a respective seat mounting plate; the seat assembly having a pair of side pivot members each having one end pivotally connected to a respective seat mounting plate and an opposite end pivotally connected to an upper distal end of a respective forward strut; wherein the wheelchair may be adjusted to select either an upright position where the latch bar is positioned in one valley or an extended position where the latch bar is positioned in the other valley.