Height adjusting device for chair backrest

Chairs and seats – Movable back

Patent

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Details

297356, 298244, 2982973, A47C 300

Patent

active

047492309

ABSTRACT:
A height adjusting device for manually locating and automatically locking a chair backrest at a desired vertical position relative to the chair seat. The device comprises two guided and slidably interlocking plates and one lock pin. Optionally, one plate may itself be the backrest support or "J" bar. One plate is mounted on the chair backrest and one plate is mounted on the "J" bar or support frame and engaged so as to slide one relative to the other. The lock pin is free to move within the slotted track of one plate and forced therewith from one locked position to a standby position or to an unlocked position by the cam action of any of a plurality of notches and inclined surfaces of a slotted cam contained on the other plate. The device is characterized by the absence of springs or other supplementary biasing means and by virtue of its simplicity it is highly reliable and economical to manufacture.

REFERENCES:
patent: 979149 (1910-12-01), Gay
patent: 1210199 (1916-12-01), Passeck
patent: 1400960 (1921-12-01), Lambert
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patent: 2256856 (1941-09-01), Zwald
patent: 2830653 (1958-04-01), Gaugler
patent: 3162416 (1964-12-01), Amarillas
patent: 4043592 (1977-08-01), Fries
patent: 4451084 (1984-05-01), Seeley
patent: 4639039 (1987-01-01), Donovan
patent: 4660885 (1987-04-01), Suhur et al.

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