Depth-adjustable device for a chair

Details Depth-adjustable device for a chair Depth-adjustable device for a chair

2007-06-19

2007-06-19

Nelson, Jr., Milton (Department: 3636)

Chairs and seats

Movable bottom

Bottom and back movable as a unit

Reexamination Certificate

active

11343612

ABSTRACT:
A depth-adjustable device for a chair comprises a rail rack, the railway is formed with a V-shaped concave, and the supporting board is slideably disposed in the railway by four clipping blocks, and in the lower part of each clipping block is formed a V-shaped convex. The inclined concave cooperates with the inclined convex to allow the adjustment device operate firmly. The V-shaped convex of the clipping blocks moveably abuts against the V-shaped concave in the bottom of the respective railways of the rail base, so that the gravity will be focused on the center and the supporting board and the rail base will slide relative to each other but will not wobble and impact each other, thus reducing the operation noise effectively.

REFERENCES:
patent: 1326417 (1919-12-01), Paine
patent: 2001999 (1935-05-01), Bishop
patent: 3542326 (1970-11-01), Reapsummer
patent: 4209159 (1980-06-01), Becker et al.
patent: 6105921 (2000-08-01), Carrig et al.

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