LOCKING DEVICE FOR CHAIR SEATS

Description

[0001] The present invention is related to a locking device for a chair seat with adjustable angle according to the preamble of the claim.

[0002] Several principles are known for adjustment and locking the angular position of seats, especially of office chairs. For a long time it already has been known to use arcuated lamellae secured to the underside of the seat and guided between lamellae blocks in a retainer which again is secured to the base of the chair, whereby a bolt is extending through a centric hole in the lamellae block and a slot in all lamellae. Locking of the seat in a desired position was provided by clamping the lamellae and the lamellae block together whereby the abutment surface which was necessary to achieve sufficient fraction in relation to the force from the locking mechanism, was provided by the width of the lamella on both sides of the slots as well as their number.

[0003] In known embodiments the width or the number of lamellae must be greater due to the slot, thereby to achieve the necessary friction surface in relation to the force which can be expected in connection with the clamping. Additionally manufacturing of the slots in the lamellae and the holes in the fixed lamellae made necessary an additonal operation in the production. Also the assembling consumed additional time for bringing the bolt through the holes in the fixed lamellae and the slots for clamping the lamellae against a fixed abutment. No consideration was made as to tolerances in the production in connection with the assembling of the lamellae.

[0004] With the locking device according to the present invention the above mentioned disadvantages by known corresponding devices are avoided and there is provided a possibility for adjustment of a desired position of the lamellae in the retainer as well as a possibility for later adjustment of the position of the operation handle when the locking device is brought in clamping position. These advantages are achieved with the locking device according to the invention as described in claim 1.

[0005] In the drawing Fig. 1 discloses a section along I-I in Fig. 3, Fig. 2 discloses a section along II-II in Fig. 1 and Fig. 3 discloses a view from the right side in Fig. 1.

[0006] Several arcuated lamellae 1 are secured to the underside of a chair seat and protrude through a retainer 7 secured to the base of the chair. In the retainer are arranged retaining lamellae in such a way that all arcuated lamellae 1 are kept between fixed lamellae. The fixed lamellae 2 are provided with recesses to be received by the side edges of the retainer 7 in such a way that the lamellae 2 are captured in the retainer 7. Against both sides of the lamella package are arranged preferably a cup shaped clamping shoe 3, 4 abutting with preferably an annular surface against a retaining lamella 2. A bolt 5 is arranged through a hole in the retainer 7 and connected turnable with the clamping shoe 3 in such a way that the clamping shoe 3 by turning of the bolt 5 may be displaced against or away from the outer lamella 2. Upon desired adjustment of the bolt 5 by means of threads 6, the bolt may be secured with a nut (not shown).

[0007] Against the opposite side of the lamella package a clamping shoe 4 is abutting against the lamella 2 whereby a bolt 8 releasably is connected with the clamping shoe 4 and threaded through a hole in the retainer 7. The bolt 8 conveniently is extended to the side of the chair and a operation arm 9 is secured to the end of the bolt 8 suitably in a place for operation by the user. Turning of the operation arm 9 will press the clamping shoe 4 against the lamella 2.

[0008] By adjustment of the bolt 5 the locking device may be adjusted upon wear of the lamella and a desired position of the operation arm 9 may be achieved by adjustment. In the same way desired position of the lamellae in the retainer may be adjusted by adjusting the bolts 5 and 8.

[0009] The preamble of the claim is based on DE 2 523 308, which discloses a device for locking a chair seat at a desired height. The device comprises a plurality of displaceable lamallae, which are connected to the chair seat and extend through a retainer. The retainer comprises fixed friction pads. Clamping means for locking the chair seat includes a lever with an eccentric pressure means. When locking the height of the chair seat, the pressure means is caused to press against the outermost friction pad at one side of the retainer, so that the lamallae are clamped between the friction pads.

Claims

1. Device for locking a chair seat in a desired angular position, comprising a plurality of first lamallae (2), which are captured by a retainer (7), a plurality of second lamallae (1) without holes, which extend between the first lamallae (2) and abut against them across their width, the second lamallae being connected to the chair seat at one end and the second lamallae being displaceable in relation to the first lamallae, and clamping means for locking the position of the chair seat, characterized in that the clamping means comprises a first and a second clamping shoe (3, 4) arranged at opposite ends of the retainer (7) and abutting against a respective one of the outermost first lamallae and being clampable by a first and a second bolt (5, 8), respectively; the first and second bolt being axially aligned and providing possibility of adjustment of the clamping points of the clamping shoes (3, 4).

Ansprüche

1. Anordnung zum Verriegeln eines Stuhlsitzes in einer gewünschten Winkelposition, mit einer Mehrzahl von ersten Lamellen (2), welche in einem Halter (7) gehalten sind, einer Mehrzahl von zweiten Lamellen (1) ohne Löcher, welche sich zwischen den ersten Lamellen (2) erstrecken und über ihre Breite an diesen anliegen, wobei die zweiten Lamellen an einem Ende mit dem Stuhlsitz verbunden sind und die zweiten Lamellen in Relation zu den ersten Lamellen verschiebbar sind, und Klemmitteln zum Verriegeln der Position des Stuhlsitzes, dadurch gekennzeichnet, daß die Klemmittel einen ersten und einen zweiten Klemmschuh (3, 4) umfassen, die an gegenüberliegenden Enden des Halters (7) angeordnet sind und an einer Entsprechenden der äußeren ersten Lamelle anliegen und durch einen ersten bzw. einen zweiten Bolzen (5, 8) klemmbar sind, wobei der erste und der zweite Bolzen axial fluchten und die Möglichkeit zur Einstellung der Klemmpunkte der Klemmschuhe (3, 4) vorsehen.

Revendications

1. Dispositif de blocage d'une assise de chaise dans une position angulaire désirée, comprenant une pluralité de premières lamelles (2) logées à l'intérieur d'un organe de retenue (7), une pluralité de secondes lamelles (1) dépourvues de trous, qui s'étendent entre les premières lamelles (2) et sont en butée contre elles sur leur largeur, les secondes lamelles étant reliées à l'assise de chaise à une extrémité et les secondes lamelles étant susceptibles d'être déplacées par rapport aux premières lamelles, et des moyens de serrage destinés à bloquer la position de l'assise de chaise, caractérisé en ce que les moyens de serrage comprennent un premier et un deuxième patin de serrage (3, 4) disposés aux extrémités opposées de l'organe de retenue (7), en butée contre respectivement l'une des premières lamelles les plus à l'extérieur et susceptibles d'être serrés par un premier et un deuxième boulon (5, 8), respectivement, le premier et le deuxième boulon étant axialement alignés et donnant la possibilité de réglage des points de serrage des patins de serrage (3, 4).

Drawing