Chairs and seats – Back movement resiliently opposed in operating position – Back and bottom adjust in a fixed relationship
Patent
1993-09-30
1995-05-23
Bertsch, Richard A.
Chairs and seats
Back movement resiliently opposed in operating position
Back and bottom adjust in a fixed relationship
297303, A47C 300
Patent
active
054174732
ABSTRACT:
A chair mechanism (1) for office chairs comprises a synchronous mechanism with integrated negative inclination. The aim is to achieve all sitting postures occurring during office work, and in particular the correction of injurious continuous sitting. The arrangement, the function and the connection of the pivot axes and the configuration of the seat support (4) within the chair mechanism (1) have predominant novelty value. Mechanical springs, which are less expensive than gas springs, are used as component parts. Springing during synchronous movement is effected by means of a torsion spring (9), while the negative inclination utilizes compression springs (21). The mechanism offers a number of options--locking in determined functions--for special applications. In addition to the wide movement range, the apparatus is distinguished by a compact and efficient construction.
REFERENCES:
patent: 3740792 (1973-06-01), Werner
patent: 4773706 (1988-09-01), Hinrichs
patent: 4986601 (1991-01-01), Inoue
patent: 5195801 (1993-06-01), Franck et al.
Bertsch Richard A.
McAndrews, Jr. Roland G.
Protoned B.V.
Selitto, Jr. Ralph W.
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