Adjustable lumbar support with remote push-button control

Claim 1

An improved adjustable lumbar support mechanism adapted for use in a seat backrest, comprising: (a) a moveable lumbar support panel element positioned underneath a lumbar seat back cushion, (b) a locking means assembly coupling said moveable panel to a backrest support frame and permitting selected positioning of said moveable lumbar support panel element; (c) a mechanical control push-button and cable assembly for manual disengagement of said locking means assembly with a push-button element installed remotely in a seat armrest and with a cable end routed and connected to a trigger element of said locking means, and; (d) a spring-load means to provide a preloaded force to said moveable lumbar support panel element, wherein said force acts against an occupant's back to counterbalance a pressure from said occupant's back when said control push-button is depressed said locking means assembly and said spring-load means being combined to form one component comprising an extensible hydraulic or pneumatic locking cylinder with an integral spring, wherein said locking cylinder further includes a controllable trigger means to momentarily unlock the cylinder and release its spring-load action; whereby such improvement provides: (e) a quick and easy readjustment of the lumbar cushion position whenever said control push-button is depressed and when a light pressure is simultaneously applied against the seat back to a desired lumbar adjustment position; (f) a firm support of the lower back of the seat occupant throughout an adjustment range and regardless of the pressure applied on the seat back as long as said push-button is not depressed.