Chairs and seats – Movable back
Patent
1987-04-23
1988-06-07
Aschenbrenner, Peter A.
Chairs and seats
Movable back
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.
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patent: 4639039 (1987-01-01), Donovan
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