Chairs and seats – Back movement resiliently opposed in operating position – Back adjusts independent of seat
Patent
1986-01-08
1987-05-12
Dorner, Kenneth J.
Chairs and seats
Back movement resiliently opposed in operating position
Back adjusts independent of seat
248371, 248561, 248609, 297267, 297270, 297303, 297328, A47C 3026
Patent
active
046644458
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a tilting mechanism for a chair seat or the like of the kind where said tilting mechanism comprises a rigid metal plate being connected to a chair support via a retaining means, said chair seat being pivotally connected with said tilting mechanism by the aid of said retaining means, first and second flexibly resilient members, e.g. a rubber pad or a spring, being provided for cooperation with said metal plate and the attaching frame of said chair seat or the like, in such a manner that said first member is compressed when the seat is tilted backwards and that said second member is compressed when the seat is tilted forwards.
For a long time it was deemed desirable to provide a chair that may be tilted backwards as well as forwards and is in a simple manner lockable in its backwards tilted, forwards tilted, or its intermediate position. A small or large extent of forward tilting of the chair may be especially suitable for typing or for working at a worktable or the like, a maximum open angle being then achieved between the upper part of the body and the thighs.
The object of the present invention is to provide a technically simple solution of this problem. According to the invention said tilting mechanism is characterized in that both said flexibly resilient members are arranged in front of and spaced from said retaining means, said first member that is compressed when the seat is tilted backwards being provided on the lower surface of said metal plate, and the second member that is compressed when the seat is tilted forwards being provided on the top surface of said metal plate, said members being arranged coaxially and secured by a screw that extends through said members and said metal plate, the upper end of said screw being connected to the attaching frame of the chair seat and its lower end being connected to an adjusting member, whereby the preliminary compression of said members and, thus, the tilting rigidity are adjustable; and that said tilting mechanism comprises locking means to lock the seat in a forward tilted, a neutral, or a backward tilted position, said locking means comprising a stem pivotally connected to said attaching frame of the seat and extending downward through a split in the metal plate and having at least two locking pins projecting across at different levels, so that all locking pins will lie in one common level aligned with said split when the stem is turned into a first position in which the seat attaching frame may be tilted freely in relation to said metal plate and that at least one of said locking pins is brought into contact with a area on the upper or lower metal plate surface adjacent said split when the stem is turned into a second position, or that locking pins are contacting the upper or lower surface resp. of said metal plate.
The invention will now be disclosed in more detail with reference to the accompanying drawings, wherein
FIG. 1 shows the tilting mechanism according to the invention in perspective, and
FIG. 2 shows an enlarged section of the tilting mechanism according to the invention.
In FIG. 1 a rigid metal plate 1 is shown and a retaining means 2 that is welded to plate 1, as clearly appearing from FIG. 2 as well. Said retaining means 2 is intended to engage a stem of a support structure, e.g. of an office chair. An attaching frame 5 is provided for the chair seat per se, and said attaching frame is transparent in FIG. 1 to simplify the drawing, although, it will be obvious that in a practical embodiment it will consist, e.g. of a rigid suitably bent metal plate. The chair seat is pivotally connected to the tilting mechanism per se by said retaining means 2, a shaft 14 protruding on each side of retaining means 2 and being supported in suitable bearings 14' in the attaching frame 5, as clearly appearing from FIG. 1. In order to ensure that the chair seat is tiltable in a controlled manner both forwards and backwards flexibly resilient member 3, 4 are provided in front of and spaced from said retaining means 2. In FIGS. 1
REFERENCES:
patent: 2374350 (1945-04-01), Herold
patent: 2635675 (1953-04-01), Buck
patent: 3430901 (1969-03-01), Cauvin
patent: 3936094 (1976-02-01), Conrad
patent: 4555085 (1985-11-01), Bauer et al.
Brown Peter R.
Dorner Kenneth J.
Hag A/S
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