Supports – With indicator or inspection means
Patent
1981-03-18
1983-07-19
Lyddane, William E.
Supports
With indicator or inspection means
248406, 297345, F16M 1300
Patent
active
043940013
ABSTRACT:
A threaded spindle as fixed to the chair seat is engaged with a nut positioned within the upper end of the base pedestal. A spring urges the nut for engagement with a clutch plate fixed to the pedestal. This clutch plate holds the nut nonrotatable so that when the chair seat is unoccupied and is rotated, the spindle threads through the nut so as to adjust the height of the chair seat. The nut and clutch plate have opposed engageable cam portions which effect automatic disengagement therebetween if the engaged nut and clutch plate are subjected to excessive torsional resistance. When the chair seat is occupied, the nut moves downwardly away from the clutch plate into engagement with a clutch washer which is seated on the pedestal but is nonrotatably keyed to the spindle, whereby the chair seat and the accompanying spindle and nut can freely rotate without causing a height adjustment to occur. A tube is positioned in surrounding relationship to the spindle and its lower end bears on the nut. When the chair seat is adjusted into its lowermost height position, an abutment on the chair seat engages the upper end of the tube.
REFERENCES:
patent: 3218021 (1965-11-01), Michalshi
patent: 3799486 (1974-03-01), Mohr et al.
patent: 3870271 (1975-03-01), Bowman
patent: 3991965 (1976-11-01), Westover et al.
patent: 4026509 (1977-05-01), Wolters
patent: 4324382 (1982-04-01), Beukema et al.
Haworth Inc.
Lechok Sarah A.
Lyddane William E.
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