Torsion spring and adjustable mounting for a chair using...

Details Torsion spring and adjustable mounting for a chair using... Torsion spring and adjustable mounting for a chair using...

A - Human Necessities

47

C

A47C 3/026 (2006.01) A47C 1/032 (2006.01)

Patent

CA 2087094

ABSTRACT Straight type torsion spring being clamped together at two ends, which ends being rotatable in relation to each other against the torsion spring force, the torsion spring comprising at least four identical torsion rods abutting laterally along their entire extension, thereby utilizing the relatively large twisting angle of the small dimension torsion rods combined with the total torsion force of the torsion spring rods, each of which independently being twisted helically when activating the spring. Adjustable mounting for a chair, preferably an office chair, comprising the torsion spring of the above defined type, a seat frame, a back frame and a mounting bracket, a tilting lever being clamped to a pipe which other end is clamped to one end of the torsion spring, the upper end of the lever being articulated to the front portion of a seat frame, the rear portion of which being articulated to a back seat frame to which rear end the back seat is secured, and the forward end of the back seat frame being articulated to the bracket, the position of which articulation being adjustable thereby enabling an adjustment of the back seat frame angle.

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