CZ404497A3 - For height adjustable leg support, particularly for assembly benches - Google Patents

Abstract

A height-adjustable foot support (20), in particular for an assembly table (10), is guided on at least one vertical guiding bar (15) with a first guiding surface (16) and a second guiding surface (17). The first guiding surface (16) has a toothed rack (18) upon which rolls a toothed wheel (31) rotatively mounted on the foot support (20). A prestressed traction spring (35) engages the foot support (20). The foot support (20) has a swivelling thrust bearing (29) on its guiding surface (17) opposite to the toothed rack (18). In an inclined position of the foot support (20), a clamping jaw (27) assisted by the force of the traction spring (35) engages the guiding surface (16) opposite to the guiding surface (17) for the thrust bearing (29), so that the foot support (20) may be locked in the inclined position on the guiding bar (15).

Description

Height adjustable foot opSra, especially for mounting tables

The invention is based on a height-adjustable foot rest, in particular for assembly tables, according to the nature of claim 1.

A foot support of this type is known from DE 41 29 496 C1. It is held on the stand by a spring and is guided at least unilaterally in the vertical guide of the stand. The vertical guide is in the design with a toothed rack into which the toothed wheel fits on the footrest. A locking pawl is provided to lock the foot rest in the corresponding position, which engages a toothed rack located on the vertical guide and removes the foot rest distant from the gear.

SUMMARY OF THE INVENTION

The height-adjustable foot rest according to the invention with the features of the claim has the advantage that it has a locking pawl.

The wear of the toothed rack is simpler in construction, with no need to fit into the toothed rack. This eliminates the rods caused by the engagement of the locking pawl.

Due to the tensioned spring, the thrust bearing is pushed against the first guide surface and the clamping jaw against the second guide guide surface, thereby causing the guide to jam, resulting in the locking of the inclined footrest in the desired position. The footrest is thus infinitely adjustable.

By means of the measures set forth in the subclaims, further preferred embodiments of the height-adjustable foot are possible.

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99. 99 9 abutments as recited in claim 1. Good guiding of the foot abutment is achieved during the height adjustment when the abutment bearing is rotatably supported and has a abutment surface for the guide surface.

As a result, jamming during the two vertical guides is avoided since the gears on both guides are rigidly connected to each other by a shaft.

BRIEF DESCRIPTION OF THE DRAWINGS

An exemplary embodiment of the invention is illustrated in the figure and explained in more detail in the following description. They show:

FIG. 1 shows a section through the assembly table with a height-adjustable foot rest according to the invention; FIG. 2: a section II-II through a vertical guide for the height-adjustable foot rest according to FIG. 1; FIG. 3: section III-III according to FIG.

Examples Embodiments of the invention

Referring to FIG. 1, a mounting table having a base 11 of sectional elements 12, which is partially shown in section, and a worktop 13, is designated as 10. well known.

On both narrow sides of the mounting table 10, there is just one vertical guide bar 15 fixed with one rear guide surface 16 and one front guide surface 17, as seen by the worker at the assembly table. The guide rods 15 are also formed, for example, by profile elements which are fixed to the base 11 of the mounting table 10. In the present embodiment, the guide rods 15 are fixed only at the bottom of the pedestal.

The profile elements of the guide rods 15 have, for example, a T-shaped groove 12 at the rear at least on the rear guide surface 16. The rear guide surface 16 is provided with a toothed rack 18. The toothed rack 18 consists of toothed segments 18U. T-shaped 19 on the rear guide surface 16. The fixing and positioning of one toothed segment 18 'after the other is based on DE 41 29 496.

The two guide bars 15 serve for guiding the height-adjustable foot supports 20. However, it is also possible to have only one guide rod 15 over which the height-adjustable foot support 22 is guided. The foot support 20 is expediently formed by a frame 21 of profile elements, which is covered by the plate 22.

The guidance of the foot rest 20 over the guide bars 15 is more clearly apparent from Fig. 2a 3, with only one of the two guide bars 15 being shown. Just opposite one support plate 24 is mounted on opposite side profiles of the foot rest frame 21. are bushings .25. for the shaft 26 extending from the right to the left bearing plate 24 / the journal 22 for the thrust bearing 29 as well as the clamping jaw 27.

In the rear part of the foot support 20, there is one spring 35 on both sides which are fixed by a fixed spring hinge 36 on the guide rod 15 or on the chassis 11 and by a movable spring hinge 37 on the height adjustable foot support 22 /. on the mounting plate 24.

The shaft 26 is mounted on both sides in the two bearings 32 located on the clamping jaws 27. However, it is also possible to locate the bearings 32 in the bearing plates 24. The shaft 26 projects beyond the frame 21 of the foot support 20 on both sides,

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The protruding ends of the gear 31 which the shafts 26 are located after are rigidly connected to the shaft.

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The thrust bearing 29 is rotatably supported on the journal

The thrust bearing 29 has a thrust surface 30 which acts on the front guide surface 17. The axis of rotation of the thrust bearing 29 and the axis of rotation of the gear 31 lie in one horizontal plane when the footrest 20 is horizontal. The clearance between the gear 31 and the abutment surface 30 of the thrust bearing 29 is dimensioned such that when the foot rest 43 is horizontal. there is a play between the front guide surface 17 and the abutment support surface 30, and the gear 31 can roll along the toothed rack 16.

The clamping jaw 27 is block-shaped and consists, for example, of a steel plate that is welded to the bearing plate 24. The clamping jaw 27 has an edge 33 which is spaced from the abutment surface 30 of the thrust bearing 29 in the direction of the spring-loaded tilt moment. As the clamping jaw 27 is made of steel and the profile of which the guide bar 15 is made of aluminum, the guide bar 16 is effectively covered by a steel sheet in the edge engagement section 33.

By the action of the spring 35, the bearing surface 30 of the bearing 29 is pressed against the front guide surface 17 and the edge 33 of the clamping jaw 27 against the rear guide surface 16 of the guide rod 1.5. As a result, between the thrust bearing 29 and the clamping jaw, the guide rail 15 is jammed, thereby locking the foot rest 20 in an inclined position.

To adjust the height of the footrest, it is in the front of the footrest 20.

that is, in the part facing the worker, pushed upwards. In doing so, the heeling moment acting by the two springs must be overcome.

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This creates a play between the support surface 30 of the support bearing 29 and the guide surface 17 of the guide rod 13. At the same time, the edge 33 of the clamping jaw 27 is lifted away from the guide surface 16 so that the clamping jaw 27 runs freely over the guide surface 16 and only the gear 31 with the gear rack 18 is engaged. The bar 18 and the height-adjustable foot support are moved upwards by the force of the spring 35. By means of the two interlocking gears 35 fixedly connected to the shaft, it is guaranteed that the foot support 20 does not laterally buckle during height adjustment.

Conversely, if the back of the footrest 20 is pushed down by a force that is greater than the force of the spring 35 / the footrest 20 moves down until the pressure on the footrest 20 is relieved again. wherein the abutment surface 30 of the abutment bearing 29 is pressed against the guide surface 17 and the edge 33 of the clamping jaw 27 is pressed against the guide surface i. of the guide bar 15, and thus the foot rest 20 is locked to the guide bar 13.

Because of the one-sided fastening of the guide rod 13 at the bottom of the pedestal 11, the pedestal 11 does not necessarily have to be a table 10, but it can also be a frame or stand which serves to secure the guide rod 13.

Claims (5)

Claims A height adjustable foot rest, particularly for a mounting table, with a pedestal having at least one guide having one first guide surface and one second guide surface, the first guide surface being a toothed rack design, further having at least one gearwheel which is rotatably mounted on a foot support engaging a toothed rack, with at least one support bearing acting on the gearwheel and associated with a second guide surface facing the toothed rack, and with a tensioned spring engaging the foot support, characterized by characterized in that it is provided with a clamping jaw (27) which engages in the inclined position of the foot support (20) by means of a spring force (35) behind the first guide surface (16) opposite the second guide surface (17) for the support bearing (29) ), in that the leg support (20) is locked in the inclined position. Foot support according to claim 1, characterized in that the clamping jaw (27) engages the first guide surface (16) in the direction of the force of the spring (35) remote from the support bearing (29). Foot support according to claim 1, characterized in that the clamping jaw (27) has an edge (33) which presses against the first guide surface (16). Foot support according to claim 1, characterized in that the support bearing (29) is rotatably supported and has a support surface (30) which, in the inclined position of the foot support, bears against the second guide surface (17). Foot support according to claim 1, characterized in that at least one bearing plate (24) is provided on the foot support (20), which is provided with a clamping jaw (27) and has • · ·· · ·· · * · ·· ·· ·· • · · • · · · • ···· · Φ · · ♦ * • · · · Φ · ··· ·· ·· bearing the pin (28) for the thrust bearing (29). Foot support according to claim 1, is č u j í c í se that The foot support (20) is guided on both sides lines (15) and that the gears (31) that engage on both lines (15) behind the respective toothed racks (17) are fixedly connected to the shaft (26).