Chairs and seats – Movable bottom – Movable independently of back
Patent
1987-02-09
1988-12-27
Dorner, Kenneth J.
Chairs and seats
Movable bottom
Movable independently of back
297 23, 297 55, 297331, A47C 510
Patent
active
047936541
ABSTRACT:
A chair with continuously height adjustable seat, comprising a frame having a pair of guide portions and a seat movable along the guide portions and capable of being fixed to the guide portions.
The frame comprises an outside frame and an inside frame both of which are inverse-U shaped pipe frames, and parallel portions of their both sides serve as the above guide portions.
The seat has a pair of support members of which rear portions are inserted in the gaps between the outside frame and inside frame, and each rear portion has a pair of rear stoppers having rubber-made covers and a pair of front stoppers, so that those stoppers securely grip the pipes of guide portions when user sits on the seat.
The pipes in the guide portion have oval cross section longer in lateral direction.
Clamping force of the stoppers is improved and right and left side stopper's group are balanced in clamping force.
In preferable case, each rear, portion has a slot for receiving a engaging member provided in the gap of guide portion so that the seat can be securely held in the folded state.
REFERENCES:
patent: 1039647 (1912-09-01), Carter
patent: 2267963 (1941-12-01), White et al.
patent: 2637371 (1953-05-01), Boutin
patent: 2843182 (1958-07-01), Stallard
patent: 4148523 (1979-04-01), Brand et al.
Cranmer Laurie K.
Dorner Kenneth J.
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