Chairs and seats – Back movement resiliently opposed in operating position – Back and seat adjust simultaneously
Reexamination Certificate
1999-03-24
2001-11-27
Cuomo, Peter M. (Department: 3636)
Chairs and seats
Back movement resiliently opposed in operating position
Back and seat adjust simultaneously
C297S301100, C297S301700, C297S344190
Reexamination Certificate
active
06322144
ABSTRACT:
The invention pertains to a seat holder with the characteristics of the general concept of claim
1
.
Such seat holders for swivel chairs, especially office swivel chairs, consisting of a tub-shaped metal piece with attachment provisions on top for the underside of a seat or a seat plate, a lower receptacle for the conical end of a support column of adjustable height, rear connections for connecting to a holder for a backrest, and at least one side or front passage for at least one operating lever, are known for example from DE-C-34 24 756. This seat holder, which is T-shaped in the top view, has a welded-on conical socket and a welded-on holding element and requires relatively heavy-gauge sheet metal.
The task of the present invention is to create a seat holder of the type named at the beginning, in which sheet metal of the lightest possible gauge can be used, in which welded seams are kept to a minimum and whose assembly is as simple as possible.
This task is solved with the features named in the characterizing part of claim
1
. Refinements and advantageous versions of the invention are included in the additional claims.
According to the invention, the tub-shaped metal piece of a seat holder of this type has side walls which are at least partially open obliquely at an angle of between 20° and 70° to the longitudinal center axis of the seat holder toward the front; there they join a front wall, and the horizontal cross section of the tub-shaped metal piece formed by the side walls and the front wall decreases in size toward the bottom of the tub. This design makes it possible to dispense with the welded-on holding element of DE-C-34 24 756, and in addition to achieve high strength by means of creases and edges or rounding in the sheet metal, which allows the thickness of the sheet metal to be reduced.
The receptacle for the conical end of the support column is a conical socket of known type, which is connected to the bottom of the tub at its lower end and which is advantageously held in a higher area by a horizontal reinforcement sheet, with the reinforcement sheet braced in or on the side walls and/or the front wall. It is advantageous for the reinforcing sheet to be clamped to the conical socket, and the reinforcing sheet is clamped, creased, stamped or riveted into the side walls and/or the front wall by means of slits, straps and/or bends.
The connecting elements for the connection with the backrest holder consist in known manner of at least two lateral holes to receive a horizontally positioned transverse pin; the holes can be executed with a deep-drawn reinforcing rim. The attachment provisions for the seat plate or seat consist of at least three horizontally bored holes in projections or tabs of the metal piece.
With the designated design it is possible to produce the tub-shaped metal piece with the attachment or connecting provisions in a single piece.
The holes for the connection with the backrest holder can be strengthened by an insert or the like; preferably this insert is a reinforcement piece with U-shaped cross section inserted transversely between the side walls, whose sides overlap the holes and have holes which are concentric to them.
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Cuomo Peter M.
Morrison Law Firm
Sifa Sitzfabrik GmbH
White Rodney B.
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