Height adjusting mechanism for a swivel chair

Details Height adjusting mechanism for a swivel chair Height adjusting mechanism for a swivel chair

1994-07-12

1995-09-19

Foss, J. Franklin

Supports

Stand

Standard type

F16M 1100

Patent

active

054510244

ABSTRACT:
An improved height adjusting mechanism for a swivel chair is equipped with a separable positioning ring block assembly including a ring block piece and an arc limiting piece that can be put together into a ring form. A screw shaft having an elongated groove is provided with two closed ends so that the positioning ring block assembly will effectively be restrained within the groove in adjustment, preventing an adjusting mount from dismount from a shaft tube due to excessive adjustment. Moreover, a peripheral flange is disposed at the bottom of the adjusting mount so that it can be readily coupled to a connecting journal disposed at the top end of the shaft tube.

REFERENCES:
patent: 3870271 (1975-03-01), Bowman
patent: 4261540 (1981-04-01), Baker
patent: 4379540 (1983-04-01), French
patent: 4479627 (1984-10-01), Wehner
patent: 4598892 (1986-07-01), Franckowiak
patent: 4720071 (1988-01-01), Nelson
patent: 4828212 (1989-05-01), Dicks
patent: 4872635 (1989-10-01), Knoblock
patent: 4903930 (1990-02-01), Jann
patent: 5342012 (1994-08-01), Ryu

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