Head-rest vertical adjustment device

Details Head-rest vertical adjustment device Head-rest vertical adjustment device

1984-07-31

1986-02-04

Lyddane, William E.

Chairs and seats

Headrest

Adjustable rectilinearly vertically

2481183, 248408, 292 85, 403325, A47C 736, A47C 110

Patent

active

045681236

ABSTRACT:
A head-rest vertical adjustment device is disclosed which is provided with a lock mechanism to restrict the vertical movements of a head-rest stay in a guide cylinder into which the head-rest stay is inserted in a manner that it is free to move vertically. This lock mechanism comprises a lock spring of a wire material to be engaged into an engagement groove formed in the head-rest stay from a slit formed in the guide cylinder, and an operation lever to release the lock spring from its locked position. First ends of both the lock spring and operation lever are rotatably mounted onto the same projection provided in the guide cylinder and second ends of these two members are integrally connected to each other.

REFERENCES:
patent: 464413 (1891-12-01), Armstrong
patent: 2939514 (1960-06-01), Buettner et al.
patent: 2967006 (1961-01-01), Sykes
patent: 3191900 (1965-06-01), Cayot
patent: 3512833 (1970-05-01), Sugiura
patent: 3544162 (1970-12-01), Uchiyamada et al.
patent: 3563602 (1971-02-01), Ohta
patent: 3750227 (1973-08-01), Hayhurst et al.
patent: 3944153 (1976-03-01), Linker
patent: 3979150 (1976-09-01), Elzenbeck

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