Supports – Stand – Standard type
Patent
1996-05-23
1998-05-12
Ramirez, Ramon O.
Supports
Stand
Standard type
248409, 248415, 29734418, F16M 1100
Patent
active
057495572
ABSTRACT:
A height adjusting device for a chair consists of an inner tube having a top end fixedly connected to a chair seat and a bottom end fixedly connecting with a bushing, a positioning tube extending upwardly from a chair base, having an upper end mounted with a sleeve for receiving the inner tube and a base plate defining a plurality of downward protrusions, a screw having a threaded upper section for threadedly engaging with the bushing and a reduced lower section defining an annular stepped edge and a bottom end extending through the base plate to fixedly attach with an engaging member defining a plurality of upward protrusions for releasably engaging with the downward protrusions of the base plate, the threaded upper section of the screw defining a top projection and a bottom projection for limiting the traveling of the bushing therealong, a spring and a bearing assembly being mounted around the reduced lower section of the screw and located between the base plate and the threaded upper section of the screw.
REFERENCES:
patent: 3923280 (1975-12-01), Good
patent: 4493469 (1985-01-01), Holobaugh
patent: 4720071 (1988-01-01), Nelson et al.
patent: 4753409 (1988-06-01), Wilcox
patent: 4860987 (1989-08-01), Warner
patent: 4872635 (1989-10-01), Knoblock et al.
patent: 5031869 (1991-07-01), Strater et al.
Huang Ching-Feng
Ramirez Ramon O.
Wood Kimberly T.
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