Chairs and seats – Movable back – Tiltable
Patent
1992-01-30
1993-03-23
Aschenbrenner, Peter A.
Chairs and seats
Movable back
Tiltable
297353, 297DIG4, 297DIG10, 403108, 403109, 745016, 745015R, 74502, A47C 1026
Patent
active
051958031
ABSTRACT:
A reclining seat back assembly for a wheelchair includes a frame member having a pair of side posts pivotally connected to the wheelchair chassis. Each side post has a rearwardly extending handle at its upper end. A pair of extendable struts each include a hollow outer strut member pivotally connected to the chassis and an inner strut member pivotally connected to one of the side posts and received in the outer strut member. The struts contract as the seat back is pivoted toward a reclined position and extend as the seat back is pivoted toward an upright position. Mounted on each outer strut member is a locking mechanism that includes an engaging member having a first engaging surface with a profile complementary to a second engaging surface on the lower end of the inner strut member. A spring biases each engaging member into engagement with its respective inner strut member. The engaging members are released from the inner strut members by actuating levers mounted on the side posts immediately beneath the handles. The actuating levers are connected to the engaging members by Bowden cable assemblies. In addition, the seat back is urged toward the upright position by a pair of spring-loaded link assemblies each having a lower end pivotally connected to the wheelchair chassis and an upper end pivotally connected to a lever arm extending from the lower end of a side post.
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P. L. Porter Company brochure entitled "Mechanical Locks," copyrighted 1977.
Bak, Articulated Wheelchair Lifts Body and Spirit, Design News, Jun. 19, 1989, at 116.
Aschenbrenner Peter A.
Invacare Corporation
LandOfFree
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