Height adjustment control arrangement

Details Height adjustment control arrangement Height adjustment control arrangement

1983-01-19

1985-01-15

Schultz, William H.

Supports

Stand

Standard type

108147, 297248, F16M 1100

Patent

active

044934696

ABSTRACT:
A height adjustment control arrangement for adjusting the height of a chair seat relative to a chair base in an office chair, includes a lower mounting assembly, an upper mounting assembly vertically displaceable relative to the lower mounting assembly, and a user-operated adjusting assembly operatively connected to the lower and upper mounting assemblies. The adjusting assembly includes an upright threaded shaft, a threaded nut on the shaft, a pull-up member on a lower side of the nut for pulling the latter upwardly, a push-down member on an upper side of the nut for pushing the latter downwardly, a keeper member movable between a locked and a released position in which displacement between the upper and lower mounting assemblies is respectively prevented and permitted, a release member for moving the keeper member between its locked and released positions, a restoring member for returning the release member to its initial position, and a counter-balance spring for urging the upper mounting assembly upwardly against the force of gravity.

REFERENCES:
patent: 1242109 (1917-10-01), Koken
patent: 2999665 (1961-09-01), Ericson et al.
patent: 3386697 (1968-06-01), Helms
patent: 3391893 (1968-07-01), Doerner
patent: 3727871 (1973-04-01), Harper
patent: 3910544 (1975-10-01), Engstrom
patent: 4087070 (1978-05-01), Hancock
patent: 4113220 (1978-09-01), Godwin et al.
patent: 4394001 (1983-07-01), Wisniewski

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