Mechanical height adjustment mechanism for chairs

Details Mechanical height adjustment mechanism for chairs Mechanical height adjustment mechanism for chairs

1979-11-01

1982-02-16

McCall, James T.

Supports

Stand

Standard type

108147, 297349, A47C 324

Patent

active

043156134

ABSTRACT:
A spindle assembly for a chair or the like includes an outer tube tapered to fit in a chair base, an inner tube having an upper end tapered to fit the chair control, and a bushing near the upper end of the outer tube to guidingly receive the inner tube therein. A screw is provided in the assembly and threadedly engaged with the inner tube, with means to prevent the screw from rotating in the absence of any axial external load on the assembly, whereby rotation of the inner tube with respect to the outer tube will cause a change of overall length of the assembly, to provide a height adjustment for a chair assembly secured thereto. Spring means employed in the assembly resiliently support the seat under a seating load and also accommodate disengagement of a rotational lock to permit swiveling of the seat with respect to the base without any change of overall height.

REFERENCES:
patent: 3391893 (1968-07-01), Doerner
patent: 3504643 (1970-04-01), Burst et al.
patent: 3741514 (1973-06-01), Shurr
patent: 3799486 (1974-03-01), Mohr et al.
patent: 3870271 (1975-03-01), Bowman
patent: 3991965 (1976-11-01), Westover
patent: 4026509 (1977-05-01), Wolters

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