Chairs and seats – Movable bottom – Tiltable
Patent
1991-04-26
1993-11-23
Brown, Peter R.
Chairs and seats
Movable bottom
Tiltable
29737812, 2973611, A47C 1032
Patent
active
052637670
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an adjustable chair the seat and backrest of which are movable relative to each other on a common fixture at the side pieces of the chair, with movement between seat and backrest, at the same time, being controlled by a pin in a guiding groove, the seat being mounted to be tiltable about a fixed point on the fixture.
Numerous designs are known of adjustable chairs of the mentioned kind in which the mutual angle may be changed. Generally, however, tilting of the backrest backwards will cause the rear portion of the seat to be moved upwards. This will cause back rest cushions which are preset for an upright position of the backrest, to move out of their correct position relative to the person sitting in the chair when the backrest is moved backwards. This will require resetting of the backrest cushions in the tilted-back position which may, obviously, create certain problems. In a reclining position, it is also most comfortable to the user of the chair that the seat is also tilted slightly backwards. In most ordinary chairs the seat is, however, tilted to approach a horizontal position, and the user may easily slip off the chair or the chair will, at best, be perceived as being less comfortable to sit in.
According to the invention an adjustable chair of the above mentioned kind is thus proposed, the characterizing features of which appear from the following claims, as well as from the following disclosure with reference to the accompanying drawings.
FIG. 1 shows the chair with its backrest in an upright position.
FIG. 2 shows the chair with its backrest in a tilted-back position.
FIG. 3 shows a modified version of the chair of FIGS. 1 and 2 in a folded position.
FIG. 4 shows the chair of FIG. 3 in an upright position.
FIG. 5 shows the chair of FIGS. 3 and 4 in a tilted-back position.
FIG. 6 shows the chair of FIGS. 3-5 in another modified version, in a folded position.
FIG. 7 shows the chair of FIG. 6 in an upright position.
FIG. 8 shows the chair of FIGS. 6 and 7 in a first tilted-back position.
FIG. 9 shows the chair of FIGS. 6-8 in a second tilted-back position.
The chair comprises a seat 1 and a backrest 2 which are mutually connected, partly via stationary fixtures 3 (only one shown) on opposite side support pieces (not shown) of the chair, and pins 12 (only one shown) which project laterally from the lower portion of opposite sides of the backrest and enter respective slide grooves 11 (only one shown) on lateral members 25 (only one shown) on opposite sides of the enter respective seat at its rear portion. Said slide groove 11 is provided at an angle with the longitudinal axis of the seat, i.e. inclined rearwards and downwards.
At its lower portion, the opposite sides of the backrest 2 are respectively provided with fixtures 13 (only one shown) the upper ends of which are respectively pivotally mounted at points 5 (only one shown) to the above mentioned stationary fixtures 3. Lowermost 10 on each back rest fixture 13 there is a fastening point 9 for a mechanism 7, 8 of optionally adjustable length, in the preferred embodiment a gas spring which may also optionally be locked in a desired position. In the shown embodiment piston rod 8 of the gas spring is rotatably connected with said fastening point 9, whereas the end of cylinder 7 is rotatably connected with a fastening point 6 on fixture 3. Fastening point 6 is indicated in FIGS. 1 and 2 at a short distance behind and below the tilting point 4 of seat 1 relative to fixture 3. The backrest is provided with a headrest and a cushion backrest 15, 16, although the number of cushions is here only intended to be an example and not to limit the invention.
When backrest 2 is moved rearwards at an angle .alpha. upon actuation of gas spring 7, 8 for relative movement of cylinder and piston rod, each pin 12 will be moved from the rear edge of slide groove 11 to the front edge of slide groove 11. At the same time the rear edge of the seat will tilt down and cause the seat proper to tilt at an angle .beta. in a rearward direction.
REFERENCES:
patent: 2321385 (1943-06-01), Herold
patent: 2324902 (1943-07-01), Benzick
patent: 2859799 (1958-11-01), Moore
patent: 4629249 (1986-12-01), Yamaguchi
patent: 4640547 (1987-02-01), Fromme
patent: 4682814 (1987-07-01), Hansen
patent: 4718725 (1988-01-01), Suhr et al.
patent: 4877291 (1989-10-01), Taylor
Asbjornsen Svein
Lade Jan
Asbjornsen Svein
Brown Peter R.
Jan Lade A/S
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