Back rest for a chair

Details Back rest for a chair Back rest for a chair

2007-10-18

2009-02-17

Nelson, Jr., Milton (Department: 3636)

Chairs and seats

Back movement resiliently opposed in operating position

Spring centers back on pivot

Reexamination Certificate

active

07490901

ABSTRACT:
A back rest for a chair with a back support and a back surface secured to the back support and able to swivel about a two-axis joint. The joint has a joint plate connected to the back surface, an element made of an elastic material that supports the joint in a ground position, and a chamber to accommodate the elastic element, connected to the back support. The joint plate is arranged in the receiving chamber between two elements made from an elastic material, holding the joint in a ground position and each being supported against the receiving chamber, and it can swivel about the two swivel axes. When the joint is placed under load, the two elastic elements are only subjected to compression. There are no tension-loaded connections which break under loading and can result in the joint falling apart.

REFERENCES:
patent: 2579918 (1951-12-01), Freeman
patent: 2796920 (1957-06-01), Cowles
patent: 3934930 (1976-01-01), Sandham
patent: 4400032 (1983-08-01), dePolo
patent: 6116687 (2000-09-01), Vogtherr
patent: 275 739 (1951-09-01), None
patent: 921588 (1954-12-01), None
patent: 0935934 (1999-08-01), None
patent: 1 192 882 (2001-09-01), None

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