Unitary spring for biasing a chair seat back support...

Details Unitary spring for biasing a chair seat back support... Unitary spring for biasing a chair seat back support...

A - Human Necessities

47

C

A47C 7/36 (2006.01) A47C 7/44 (2006.01)

Patent

CA 2089694

ABSTRACT An improved mechanism for biasing a seat back with respect to a seat tilt mechanism is disclosed. The improved mechanism includes a unitary spring having two coil springs interconnected by a loop. Each coil has an arm extending therefrom and the two arms are parallel. The arms and loop are integrally formed with the coils to form the unitary spring. The seat tilt mechanism is attachable to the underside of a chair seat and a seat back support bracket is pivotally attached to the seat tilt mechanism at the back of the chair seat. A seat back support arm is attached at one end to the seat back and the other end is attached to the seat back support mechanism. The unitary spring is disposed between the seat tilt mechanism and the seat back support mechanism to bias the latter with respect to the former. The unitary spring is positioned so that if the loop bears against the edge of the seat tilt mechanism housing then the arms bear against a portion of the seat back support bracket and vice versa. With no force applied against the seat back the unitary spring biases the seat back to the upright position. When a user leans back against the seat back the latter pivots about the pivotal connection against the spring thereby a restoring force in the spring which returns the seat back to the upright position. The improved biasing mechanism exhibits a significantly longer lifetime than the prior art device which uses two spaced and independent jack springs.

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