Supports – Stand – Standard type
Patent
1988-11-04
1990-02-27
Chin-Shue, Alvin C.
Supports
Stand
Standard type
2481882, F16M 1100
Patent
active
049039300
ABSTRACT:
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.
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Chin-Shue Alvin C.
Talbott David L.
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