Supports – Stand – Standard type
Patent
1977-02-10
1978-02-28
Staab, Lawrence J.
Supports
Stand
Standard type
248412, 248402, F16M 1100
Patent
active
040762017
ABSTRACT:
An adjustable chair-spindle assembly including the combination of a pneumatic and mechanical index mechanism which controls the height displacement of a seat supported by the assembly. By operating a hand lever positioned below the seat, the mechanical index mechanism is released from a locked arrangement, allowing the seat to be raised or lowered at a controlled rate by the pneumatic mechanism. The index mechanism comprises an index housing having a lift tube secured thereto which is operated by the handle lever, wherein the linear movement of the index housing allows the index and bearing balls to be disengaged from a locked position. Movement of the index balls permits the bearing balls to be released from annular grooves formed in the index spindle by allowing index rings to shift upwardly, at which time the seat of the chair is free to be adjusted upwardly or downwardly--the chair being spring-loaded to carry the weight of the seat in order for it to lift up, or it may be moved down by adding force to the seat. When the handle is released, the chair will lock into the selected position.
REFERENCES:
patent: 2710048 (1955-06-01), Dawson
patent: 2851126 (1958-09-01), Ward
patent: 3201079 (1965-08-01), Doetsch
patent: 3228647 (1966-01-01), Musianowycz
patent: 3865341 (1975-02-01), Fortnam et al.
Lojacono Francis X.
Staab Lawrence J.
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