Mechanical chair-height control mechanism

Details Mechanical chair-height control mechanism Mechanical chair-height control mechanism

1984-07-27

1986-07-08

Britts, Ramon S.

Supports

Stand

Standard type

2481887, 297348, F16M 1124, A61G 1500

Patent

active

045988927

ABSTRACT:
A chair having a threaded spindle connected to the chair seat and projecting downwardly therefrom and being rotatably supported within the pedestal of a base. A load-released height-adjusting mechanism coacts between the pedestal and the spindle and includes a nut threadably mounted on the spindle and spring-urged upwardly for clutchable engagement with a clutch member which is nonrotatably and axially secured relative to the pedestal. The clutch member includes not only a top clutch plate positioned for engagement with the nut, but also an axially elongated sleeve portion which projects downwardly in surrounding relationship to the nut and is stationarily coupled to the pedestal by means of a bayonet-type coupling. The sleeve portion of the clutch member has a resilient locking finger which cooperates with the bayonet coupling for preventing relative rotation of the clutch member relative to the base after they have been coupled together.

REFERENCES:
patent: 3160382 (1964-12-01), Lee
patent: 3218021 (1965-11-01), Michalshi
patent: 3667716 (1972-06-01), Fries
patent: 3705704 (1972-12-01), Textoris
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: 4262871 (1981-04-01), Kolk et al.
patent: 4324382 (1982-04-01), Beukema et al.
patent: 4394001 (1983-07-01), Wisniewski
patent: 4494721 (1985-01-01), Trinkel et al.

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