Low profile chair iron

Details Low profile chair iron Low profile chair iron

1976-06-04

1980-02-19

Zugel, Francis K.

Chairs and seats

Back movement resiliently opposed in operating position

Constantly oriented during up-and-down movement

A47C 300

Patent

active

041891791

ABSTRACT:
A low profile chair iron for controlling biased tilting between a seat or backrest and a support uses a substantially flat coil spring of increasingly smaller diameter coils between pivotably connected support bracket and a chair part bracket. Tension adjusting means for the spring are pivotably mounted with respect to the central coils of the spring and/or support bracket for minimizing nonuniform loading of the spring during the pivotable movement of the chair part bracket with respect to the support bracket.

REFERENCES:
patent: 92787 (1869-07-01), Bradway
patent: 354039 (1886-12-01), Bunker
patent: 380651 (1888-04-01), Fowler
patent: 405530 (1889-06-01), Bunker
patent: 409509 (1889-08-01), Shults
patent: 452686 (1891-05-01), Adams et al.
patent: 622073 (1899-03-01), Quinlan
patent: 1097361 (1914-05-01), Persons
patent: 2678082 (1954-05-01), Walker
patent: 2729273 (1956-01-01), Hamilton et al.
patent: 2743104 (1956-04-01), Dodson
patent: 3339973 (1967-09-01), Doerner
patent: 3656805 (1972-04-01), Engstrom

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