PIVOTABLE BRACKET

Abstract

A pivotable bracket is provided such that a constant moment of friction is present at the hinge (4). A first hinge part (5) is provided, which has a cylindrical pin (6) and a contact surface (11). A second hinge part (12) is provided, which has a bearing bush (13), which can be pushed over the pin (6), with two friction surfaces (15, 16) directed at right angles to the central axis (14). The second hinge part (12) is braced against the contact surface (11) by means of a tensioning device (7, 19, 20, 21, 22) arranged on the upper side of the pin (6).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings:

FIG. 1 is a longitudinal sectional view of a pivotable bracket according to the invention;

FIG. 2 is a top view of two thrust washers of the pivotable bracket according to the embodiment of FIG. 1; and

FIG. 3 is a perspective view of the bracket according to FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to the drawings in particular, FIG. 1 schematically shows the longitudinal section of a pivotable bracket 1. The bracket 1 comprises a first bracket section 2, a second bracket section 3 and a hinge 4 between the bracket sections 2, 3. The hinge 4 comprises a first hinge part 5 at the first bracket section 2, which [the hinge part] has a vertically upwardly pointing pin 6 with a threaded bolt 7 and cylindrical bushes 8, 9 that are in contact with the pin 6. The pin 6 is arranged on the first bracket section 2 by means of a fastening screw 10 in such a way that it is secured against rotation and has a disk-shaped contact surface 11 projecting from the pin 6 on its underside.

The second hinge part 12 comprises a bearing bush 13 in the second bracket section 3 and two friction surfaces 15, 16 extending at right angles to the central axis 14. The internal diameter of the bearing bush 13 corresponds to the external diameter of the bushes 8, 9. Corresponding to the view in FIG. 1, a friction disk 17 is located between the lower friction surface 15 and the contact surface 11 of the pin 6.

A first thrust washer 22, which is received in a housing section 27 of the second bracket section 3 in such a way that it is secured against rotation, is received on the upper friction surface 16. This is followed alternatingly by a friction disk 24 and a second thrust washer 19, which is arranged at the pin 6 in such a way that it is secured against rotation in relation to the first thrust washer 22. This is followed by the friction disk 24 and again by the first thrust washer 22. The layered structure comprising thrust washers 19, 22 and friction disks 24 is closed on the upper side by the second thrust washer 19.

The thrust washers 19, 22 and the friction disks 24 are braced against the upper friction surface 16 by means of two plate springs 20, which lie on the topmost, second thrust washer 19, as well as a lock nut 21 at the threaded bolt 7 of the pin 6. Since the thrust washers 19, 22 are either connected to the pin 6 in such a way that they are secured against rotation or to the housing section 27, and the second thrust washer 19 lying on the upper side of the layered structure is connected to the pin in such a way that it is secured against rotation, the second thrust washer 19 has no relative motion relative to the lock nut 21 during the pivoting of the bracket sections 2, 3, so that loosening of the lock nut 21 and hence a reduction of the moment of friction cannot occur.

A handwheel 29 with a thrust collar 30, which is turned into an internal thread 32 on the upper side of the pin 6 by means of a threaded stem 31, is provided for the fine adjustment of the moment of friction within the hinge 4. Depending on the depth to which the threaded stem 31 is screwed in, a varying pressing force is applied by the thrust collar 30 on the thrust washers 19, 22 and the friction disks 24 and the moment of friction is thus changed.

FIG. 2 shows a top view of the first thrust washer 22 and the second thrust washer 19. The first thrust washer is provided with an outer notch 23 as a means securing against rotation. The second thrust washer has internal teeth 18.

FIG. 3 illustrates the bracket 1 according to FIG. 1 is a perspective view in the form of an exploded view. Identical components are designated by the same reference numbers as in FIGS. 1 and 2.

The pin 6 has a means securing against rotation in the form of teeth 25, which are arranged distributed over the circumference and mesh with the internal teeth 18 of the first thrust washer 19. A wedge 26, which meshes with the outer notch 23 of the first thrust washer 19, is provided, corresponding to this, within the housing section 27.

While a specific embodiment of the invention has been shown and described in detail to illustrate the application of the principles of the invention, it will be understood that the invention may be embodied otherwise without departing from such principles.

Claims

1. A pivotable bracket comprising: a first hinge part including a cylindrical pin having a contact surface;a second hinge part, said first hinge part and said second hinge part forming a hinge in which said first hinge part and said second hinge part can be rotated in relation to one another, said second hinge part having a bearing bush pushed over said pin, said bearing bush having two friction surfaces directed at right angles to a bearing bush central axis; anda tensioning device fixed to said pin, wherein one of said friction surfaces is located at said contact surface and another of said friction surfaces is loaded via said tensioning device.

2. A bracket in accordance with claim 1, wherein said tensioning device comprises a threaded bolt at the end of said pin, a lock nut, a tensioning spring and thrust washers.

3. A bracket in accordance with claim 2, wherein said thrust washers comprise a first thrust washer connected to said second hinge part in such a way that said first thrust washer is secured against rotation.

4. A bracket in accordance with claim 2, wherein said thrust washers comprise a second thrust washer connected to said pin in such a way that said second thrust washer is secured against rotation.

5. A bracket in accordance with claim 2, further comprising friction disks wherein said thrust washers are arranged layer by layer with respective ones of said friction disks interposed therebetween.

6. A bracket in accordance with claim 2, further comprising an adjusting element acting on said thrust washers to increase contact pressure, said adjusting element being provided on an upper side of said pin.

7. A bracket in accordance with claim 6, wherein said adjusting element is fastened to said pin by means of a threaded connection which changes the relative position between said adjusting element and said pin.

8. A pivotable bracket comprising: a first hinge part including a cylindrical pin having a contact surface;a second hinge part, said first hinge part and said second hinge part forming a hinge in which said first hinge part and said second hinge part can be rotated in relation to one another, said second hinge part having a bearing bush pushed over said pin, said bearing bush having two friction surfaces directed at right angles to a bearing bush central axis; anda tensioning means for loading one of said friction surfaces located at said contact surface relative to another of said friction surfaces.

9. A bracket in accordance with claim 1, wherein said tensioning means comprises a threaded bolt at the end of said pin, a lock nut, a tensioning spring and thrust washers.

10. A bracket in accordance with claim 9, wherein said thrust washers comprise a first thrust washer connected to said second hinge part in such a way that said first thrust washer is secured against rotation.

11. A bracket in accordance with claim 9, wherein said thrust washers comprise a second thrust washer connected to said pin in such a way that said second thrust washer is secured against rotation.

12. A bracket in accordance with claim 9, further comprising friction disks wherein said thrust washers are arranged layer by layer with respective ones of said friction disks interposed therebetween.

13. A bracket in accordance with claim 9, further comprising an adjusting means for acting on said thrust washers to increase contact pressure, said adjusting means being provided on an upper side of said pin.

14. A bracket in accordance with claim 13, wherein said adjusting means is fastened to said pin by means of a threaded connection which changes the relative position between said adjusting element and said pin.