Shock absorber for a back rest of a chair

Details Shock absorber for a back rest of a chair Shock absorber for a back rest of a chair

1992-06-26

1994-07-12

Cuomo, Peter M.

Chairs and seats

Back movement resiliently opposed in operating position

Constantly oriented during up-and-down movement

297301, A47C 1032

Patent

active

053282370

ABSTRACT:
A shock absorber employable for a back rest of a chair is operatively associated with a pair of support arms for the back rest via an engagement piece turnably supported by a first shaft. A mounting frame is turnably supported by a second shaft while a pair of compression springs mounted on spring mounting rods are received in the mounting frame between a slidable spring support portion and a rear wall of the mounting frame. The engagement piece is adapted to turn about the first shaft together with the support arms while it is engaged with an engagement portion bridged between the rear ends of the spring mounting rods. In addition, a guide member is slidably bridged between the spring mounting rods outside of the rear wall of the mounting frame, and a nut is turnably received in the guide member to turn about a third shaft. The nut is threadably engaged with an adjustment bolt. When a handle fixedly secured to the adjustment bolt is rotated in a predetermined direction so as to allow the engagement portion integrally bridged between the rear ends of the spring mounting rods to assume the lower position in the vicinity of the first shaft, a weak shock absorbing function is exhibited for the back rest. When the handle is rotated in the opposite direction so as to allow the engagement portion to assume the upper position remote away from the first shaft, a strong shock absorbing function is exhibited for the back rest.

REFERENCES:
patent: 2272980 (1942-02-01), McLellan et al.
patent: 4200332 (1980-04-01), Brauning
patent: 4479679 (1984-10-01), Fries et al.
patent: 4653806 (1987-03-01), Willi
patent: 4830431 (1989-05-01), Inoue
patent: 5042876 (1991-08-01), Faiks
patent: 5150948 (1992-09-01), Volkle
patent: 5207479 (1993-05-01), Wickman et al.
patent: 5238294 (1993-08-01), Ishi et al.

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