Supports – Stand – Standard type
Patent
1987-05-05
1988-06-14
Foss, J. Franklin
Supports
Stand
Standard type
F16M 1100
Patent
active
047507012
ABSTRACT:
A control assembly for adjustable displacement of a chair seat or the like comprises a lead screw threaded to a nut for relative longitudinal movement in order to adjust the height of the chair with the relative movement of the screw and nut. The control assembly also includes a rotational bearing for swiveling the seat while maintaining the desired seat height; the rotational bearing also allows backdriving, for example rotation of the screw, without rotation of the seat. The control assembly also includes a locking mechanism for selectively preventing relative movement of the screw with respect to the nut in order to maintain the desired seat height. A power spring can be provided on the assembly to drive selective elevation, for example of the screw and seat, when the screw has been unlocked.
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Carpenter William M.
Folson Henry J.
Buckman T. W.
Foss J. Franklin
Illinois Tool Works Inc.
O'Brien J. P.
Olson Robert A.
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