Chairs and seats – Movable back
Patent
1997-11-10
1999-03-16
Brown, Peter R.
Chairs and seats
Movable back
248412, A47C 740
Patent
active
058820787
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a clamping arrangement for height-adjustable back rests.
Such clamping arrangements, consisting of a guide section for a tubular section of the back rest and a clamping means such as a screw for clamping the tubular section in the guide section, have long been known. Known from DE-U-295 10 446.5 is a back rest clamping arrangement in which a clamping body can firmly engage with the tubular section of a back rest by means of a laterally arranged. However, known clamping arrangements often have the disadvantage that the tubular section will loosen in time.
The objective of the present invention is to create a clamping arrangement for height-adjustable chair back rests which will not loosen over the long term and which are easy and comfortable to operate.
Further developments and advantageous embodiments of the invention are described hereinafter.
According to the invention, a clamping arrangement for clamping the tubular section of a back rest consists of a clamping body pivotably mounted to an upper pivot point to swivel on the tubular section in the guide section or an adjacent section firmly mounted to same, and an actuator body, whereby the actuator body is pivotably arranged behind the clamping body, below the pivot point of the clamping body, to swivel on the tubular section, and whereby the actuator body has at least two different diameters, seen from its pivot axis.
According to a preferred embodiment of the invention, the actuator body has a helical cross section. The clamping body is mounted on a bolt in the lower guide section by a pivot arm pointing downward, and the bottom end of the pivot arm adjoins the actuator body in at least one of its positions.
It is an advantage when the clamping body or the pivot arm is provided with an elastically mounted catch for a recess in the tubular section of the back rest.
The invention is described below by way of example and with reference to the drawings, in which:
FIGS. 1 to 3 show three views of a clamping arrangement including a sectional view in FIG. 1;
FIGS. 4 to 6 show three views of the clamping body of FIGS. 1 to 3.
The clamping arrangement according to FIGS. 1 to 3 consists of a guide section 2 with one rear wall and two lateral walls, so that the top view shows a U-shaped cross section, whereby the rear wall is provided with two inwardly bent notches 2', so that a tubular section 3 of a back rest can slide in the guide formed by notches 2' and the rear wall, and of a clamping means for clamping tubular section 3 in the desired insertion depth. The clamping means consists of a clamping body 10 which together with a pivot arm 4 is pivotably mounted to a bolt 5 which is attached laterally and above in guide section 2, and of an actuator body 6. As is shown in the top view, clamping body 10 adjoins the tubular section 3. For this purpose, as is shown more clearly in FIG. 5, its contour 14 is adapted to tubular section 3. The clamping body 10 is fastened to the side walls of pivot arm 4 by means of a pin 12, catches or some such. For bolt 5, it is provided in its rear wall with a groove 17 shown in detail in FIG. 4. The rear wall of pivot arm 4 is recessed in this area. In the position shown, the clamping body 10 only adjoins tubular section 3 and does not clamp it. The side walls of guide section 2 are provided with holes 9 for fastening to a seat carrier.
Pivot arm 4, which in top view has a U-shaped cross section open toward the tubular section 3, and whose side walls partially surround clamping body 10, is extended toward the bottom and can be made to engage with an actuator body 6. The actuator body 6 is mounted on a pivotable lateral bolt 7 in the side walls of guide section 2. As shown in FIG. 3, lateral bolt 7 is extended on one side and provided with a hand wheel. In the cross sectional view, the actuator body 6 has a helical contour. In FIG. 3, the side of actuator body 6 with the smallest circumference is turned toward the bottom end of pivot arm 4. If the actuator body 6 is turned clockwise, the side with the greate
REFERENCES:
patent: 1630870 (1927-05-01), Strunck
patent: 4430017 (1984-02-01), Stefancich
patent: 4932622 (1990-06-01), Hayakawa
patent: 5449004 (1995-09-01), Parsons et al.
Brown Peter R.
Sifa Sitzfabrik GmbH
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