Chairs and seats – Back movement resiliently opposed in operating position – Back and seat adjust simultaneously
Patent
1979-10-12
1981-06-02
Zugel, Francis K.
Chairs and seats
Back movement resiliently opposed in operating position
Back and seat adjust simultaneously
297316, 297305, A47C 1032
Patent
active
042707978
ABSTRACT:
The ergonomic chair comprises at the upper end of the chair column, a supporting arm on which the front end of the seat supporting frame is articulated for pivoting vertically. At the rear end of the seat supporting frame, a back rest is connected to the seat supporting frame and the supporting arm by means of a movement guiding and return mechanism so that an alteration in the inclination of the back rest automatically causes a proportional alteration in the inclination of the seat supporting frame. The movement guiding and return mechanism is divided into two structural units which are separate in construction. The one is a linkage mechanism which is effective between a back-rest connection construction, the seat supporting frame and the supporting arm, with a movement lock which is effective when the chair is in the position of rest. The other structural unit is constructed in the form of a spring mechanism which can be locked and which applies a force to the chair column between the back-rest connection construction and the supporting arm, through which the back rest and the seat supporting frame are restored from a backwardly inclined position into a normal initial position.
REFERENCES:
patent: 2321385 (1943-06-01), Herold
patent: 2680474 (1954-06-01), Fritz
patent: 2796918 (1959-06-01), Luckhardt
patent: 2901027 (1959-08-01), Dickson
patent: 3602537 (1971-08-01), Kerstholt
patent: 4170382 (1979-10-01), Wheeler
Protoned B.V.
Zugel Francis K.
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