Chair height adjustment mechanism

Details Chair height adjustment mechanism Chair height adjustment mechanism

A - Human Necessities

47

C

155/38

A47C 3/24 (2006.01)

Patent

CA 2010952

CHAIR HEIGHT ADJUSTMENT MECHANISM ABSTRACT OF THE DISCLOSURE This chair height adjustment mechanism has a tubular housing fixed to the chair base, with vertically-spaced bearings providing lateral support for a threaded spindle secured to the chair seat. The upper bearing permits the spindle to move axially, and a nut in threaded engagement with the spindle below the upper bearing is biased upward into clutch engagement with the lower end of this bearing. The biasing spring acts between washers keyed to the spindle, the lower of these being supported by the upper face of the lower spindle bearing. Weight on the seat moves the spindle downward against the spring action to disengage the nut so it can rotate with the spindle, thus removing any change in the height adjustment of the chair when it is occupied. The spring resiliently supports the weight of the seat occupant, providing a cushioned feel. The lower bearing can comprise a-standard lower member and a series of bearing extension members to provide a longer bearing for a longer height adjustment mechanism using standard size components.

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