Arrangement in connection with an adjustable back rest cushion o

Details Arrangement in connection with an adjustable back rest cushion o Arrangement in connection with an adjustable back rest cushion o

1990-04-17

1992-05-12

Chen, Jose V.

Chairs and seats

Bottom or back with means to alter contour

297353, 297410, A47C 300

Patent

active

051121069

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to an arrangement in connection with a height adjustable back rest cushion, said cushion being connected with a slide means which is slidable along a guide constituting part of the back rest, and where said cushion may be moved relative to said slide means.
Several such arrangements are previously known, inter alia, from NO-PS 149 608.
For a long time, however, it was desired that such back rest cushions should be adjustable either manually or electrically and that it should, at the same time be possible to lock the cushion(s) relative to the back rest.
According to the present invention it is proposed that said guide is a contoured rail which is provided at a rearward distance from the back rest front, that the slide means is a two-piece means comprising a slide member designed to be moved in a groove in the rail only in the longitudinal direction of the rail, and a cushion holder member the rear portion of which is pivotably attached to one end of a front portion of the slide member and is lockable by snap locking to the other end of said front portion of the slide member, the front portion of the cushion holder member being provided with means for engagement with the rear side of the cushion.
The invention also indicates means for closing the opening appearing on the front of the back rest, on top, and below the back rest cushion, respectively.
These and further characterizing features of the present invention will appear from the following claims as well as from the following description with reference to attached drawings.
FIG. 1 shows a phantom view, as seen from one side, of a first embodiment of the arrangement according to the invention.
FIG. 2 illustrates a chair having a back rest and back rest cushions provided and supported according to the present invention.
FIG. 3 is an enlarged section of the arrangement according to the invention as shown in FIG. 1.
FIG. 4 is a cross section of the arrangement of FIG. 1.
FIG. 5 illustrates the arrangement of FIG. 3 in a front view, and FIG. 5a is shown for completeness and corresponds to FIG. 4.
FIG. 6 shows a modification of the embodiment shown in FIG. 5 and is intended for motorized displacement of the back rest cushion.
FIG. 6a is shown for completeness and corresponds to FIG. 5a.
FIG. 7 illustrates another embodiment utilizing the screw principle for motorized displacement of the back rest cushion.
FIG. 8 is a cross sectional view of the arrangement of FIG. 7.
FIG. 9 illustrates the arrangement of FIG. 7 in a front view, and
FIG. 9a is shown for completeness and represents a diminution of FIG. 8.
FIG. 10 shows a third embodiment of the arrangements according to the invention where displacement should be manual and the cushion is locked in place by the aid of a special friction member.
FIG. 11 shows the arranement of FIG. 10 in cross section.
FIG. 12 is a front view of the arrangement of FIG. 10, and FIG. 12a is a cross sectional view of the arrangement in diminution relative to FIG. 11.
In the chair comprising a back rest 1 and a seat 2, a contoured rail 3 is provided in back rest 1 at a distance from the front side of the back rest. A toothed rack or toothed belt 6 may be provided inside the contoured rail. A slide means is used for displacing back rest cushion 10 and consists of a cushion holder member 4 which in its front portion is provided with member 8 intended for engagement with a support plate 9 for cushion 10, as clearly appearing from FIG. 1. The slide means, additionally, comprises a slide member 5 which at its rear portion is provided with a toothed rack segment 7 which is shaped for selective engagement with toothed rack or toothed belt 6. The two parts of the slide means are pivotably connected by the aid of a hinge 14, which is preferably provided at the upper portion of the slide means. At the lower portion of slide means a snap lock is provided comprising a pin portion 15' and a clamp portion 15". To displace the back rest cushion it is pulled out of the back rest at its lower portion causing snap engage

REFERENCES:
patent: 2905230 (1959-09-01), Gabriel
patent: 3880463 (1975-04-01), Shephard
patent: 4221430 (1980-09-01), Frobose
patent: 4256341 (1981-03-01), Goldner et al.
patent: 4451084 (1984-05-01), Seeley
patent: 4573737 (1986-03-01), Korn
patent: 4616877 (1986-10-01), Slaats et al.
patent: 4711492 (1987-12-01), Asbjornsen

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