Rocking chair, particularly office chair construction

Details Rocking chair, particularly office chair construction Rocking chair, particularly office chair construction

1990-09-10

1991-10-15

Brown, Peter R.

Chairs and seats

Back movement resiliently opposed in operating position

Back and bottom adjust in a fixed relationship

297304, A47C 3026

Patent

active

050568663

ABSTRACT:
To provide for a compact seat adjustment mechanism, an elongated seat support (21) is secured to a floor support structure including a central post (13), to extend at an upwardly directed angle of inclination. The seat (17), attached to a seat support (29), is pivotally located to pivot about an axis (37) close to the front edge of the seat. The seat is maintained in position by a torsion spring assembly (23), the spring tension of which is adjustable by a laterally positionable adjustment knob (63), and a blocking element in form of a gas spring or hydraulic spring (27) couples the seat to the seat support, the respective blocking element being attached with a first end between the pivot axis support and the floor support and with its other end to the seat (17) such that it will extend in the genral direction of the elongated seat support (21) and form an acute angle with respect to the seat support, which angle will be somewhat greater than the angle of inclination of the seat support (210 itself. The bias of the torsion spring (39) of the torsion spring system can be changed by adjusting the position of a setting arm (45) by a wedge on a rotatable spindle, coupled to the adjustment knob (63). The construction places the mechanism parts close to the seat and permits a generally pleasing, clean appearance, while permitting adjustment of spring tension and blocking by the user, while seated on a chair. Uncoupling the respective blocking element at one end, for example by removal of a bolt, permits tilting the seat back about the tilt axis (37) by approximately 180.degree., and providing access for service to the chair mechanism.

REFERENCES:
patent: 4235408 (1980-11-01), Sapper
patent: 4589697 (1986-05-01), Bauer et al.
patent: 4729539 (1988-03-01), Nagata
patent: 4832402 (1989-03-01), Zund

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