Patent ID: 7938487

Claim:
A tilting fitting device for a chair to enable a chair seat when fitted to the device to be tiltable forwards and backwards against spring force of tilt-resisting springs, the tilting fitting device having an upper part that is fastenable to the chair seat and a lower part that is fastenable to a chair base and tiltably connected to the upper part, wherein the lower part is provided with a first and a second pair of tilt-resisting springs; wherein the upper part has a tilting axis about which the upper part is tiltable relative to the lower part, the tilting axis extending from one side of the device adjacent the first pair of springs to the other side adjacent the second pair of springs; wherein the springs of the first pair of tilt-resisting springs are located on a respective side of the tilting axis, and have fixed spacing; wherein the springs of the second pair of tilt-resisting springs are located on a respective side of the tilting axis; wherein the tilting resistance of the device is adjustable by adjusting spacing between the second pair of tilting springs and thereby distance of each spring thereof from a respective side of the tilting axis; wherein in the second pair of tilt-resisting springs, which constitute said spacing-adjustable tilt-resisting springs, each spring is eccentrically supported on or in the lower part on a respective rotatable support member; wherein each of the support members is provided with a segment of a toothed wheel; wherein an actuating element is arranged for simultaneous engagement with the two support members, the actuating element, along a part of each of its two sides in the element's longitudinal direction of motion, having a row of teeth designed for engagement with a toothed wheel or a toothed wheel segment of a respective one of the support members; and wherein the actuating element, when moved in the longitudinal direction of the tilting axis, is adapted to cause rotation of the support members and the springs mounted thereon, thereby changing the spacing of the springs.