DE20017803U1 - Gradually adjustable table leg - Google Patents

Description

Grahl GmbH

31595 Steverberg / Voigt i

Stepwise length-adjustable table leg

The invention relates to a table leg consisting of a telescopic tube arrangement comprising an outer tube and an inner tube that can be moved relative thereto.

In order to adapt the table height to different working or usage conditions and to different body sizes of the people sitting at a work table, for example, it is known to use table legs made of two telescopically movable tube profiles relative to each other. As a rule, the outer tube is rigidly attached to the underside of the table top, while the inner tube is slidably guided in the outer tube and forms the lower end of the table leg. The length of the table leg can be changed either continuously, for example using a spindle, or in certain increments, i.e. step by step.

The invention is based on the object of creating a system for a table leg that is simple in design and manufacture and also easy to use for gradually adjusting the table leg length.

The features of claim 1 serve to solve this problem.

By pressing the pivot lever against the force of the spring, the locking lug can be moved out of a single recess in the inner tube so that the inner tube can be moved relative to the outer tube. When the desired table leg length is reached, the pivot lever is released again so that the return spring loads the pivot lever in such a way that the locking lug can engage in a corresponding recess as soon as it is opposite it.

The spring is preferably a leaf spring which is attached to the pivot lever with its ends under prestress such that it is supported with its central region against the inner tube and slides along the inner tube during displacement of the inner tube relative to the outer tube.

In a modified embodiment, it is also possible to provide a stop on the pivot lever itself to support the central leaf spring area, although this requires more construction effort than the first described embodiment. Further features of the invention are dealt with in the subclaims.

The invention is explained in more detail below with reference to the drawing.

Figure 1 shows a partial isometric view of a table equipped with the table leg according to the invention;

Figure 2 shows an isometric partial view of a section of the inner tube; Figure 3 shows a detail of a longitudinal section of the table leg according to the invention; Figure 4 shows a sectional view along the line IV-IV in Figure 3; Figure 5 shows an isometric partial view of the table leg according to the invention.

Figure 1 shows a table 1 with a table top 2 to which table legs 5 consisting of an outer tube 6 and an inner tube 7 are attached by means of a crossbar 3 and connecting pieces 4, to the lower ends of which table feet 8 are attached. The outer tube 6 and the inner tube 7 preferably consist of extruded tube profiles and can, for example, have a substantially elliptical cross-section, as shown.

According to Figure 2, the inner tube 7 is provided with several recesses or openings 9 arranged in a row in the longitudinal direction of the tube. On the outside of the outer tube 6, as can best be seen in Figure 5, a U-profile 10 is formed which runs in the longitudinal direction of the tube, with inward-facing flanges 10.1 formed on the ends of the U-profile legs. According to Figure 3, a horizontally running pivot axis 11 is inserted into the legs of the U-profile 10, on which a pivot lever 12 is mounted. A locking lug 12.1 for locking into one of the recesses or openings 9 is attached to the pivot lever 12 below the pivot axis 11. Above the pivot axis 11, a return spring 13 is assigned to the pivot lever 12 in such a way that the locking lug 12.1 is pressed into the respective opening or recess 9.

The return spring 13 can preferably be a leaf spring which is attached to the pivot lever 12 with its ends under prestress and which rests with its middle region against the outside of the inner tube 7. According to Figure 3, the leaf spring 13 is clamped with its ends in two slots in the pivot lever 12 which are arranged at a vertical distance from one another and which are arranged in the pivot lever so as to run obliquely in essentially the same direction. In this way, a secure fixation of the leaf spring 13 to the pivot lever 12 is ensured, so that the pivot lever 12 and leaf spring 13 can be delivered as a pre-assembled unit.

The flange strips 10.1 formed on the leg ends of the U-profile are provided with recesses in the area of the pivot lever 12 as shown in Figure 5.

If one wants to accept an increased design effort, the pivot lever 12 can be provided in the area of the middle section of the leaf spring 13 with a

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be provided with a stop against which this central leaf spring area rests, and not, as in the embodiment shown, sliding against the inner tube 7.

Claims (6)

1. Stepwise length-adjustable table leg, consisting of a telescopic tube arrangement comprising an outer tube ( 6 ) and an inner tube ( 7 ) which can be moved relative to it, the inner tube ( 7 ) being provided with a plurality of recesses or openings ( 9 ) lying in a row in the longitudinal direction of the tube , and a pivoting lever (12 ) which can be pivoted about a horizontal pivot axis ( 11 ) and which has a locking lug ( 12.1 ) which can be latched into one of the openings ( 9 ) under the influence of a return spring, characterized in that a U-profile ( 10 ) running in the longitudinal direction of the tube is formed on the outside of the outer tube ( 6 ), and the pivot axis ( 11 ) is mounted between the vertices of this U-profile ( 10 ). 2. Table leg according to claim 1, characterized in that inwardly directed flange strips ( 10.1 ) are formed on the ends of the legs of the U-profile, which have recesses in the region of the pivot lever ( 12 ). 3. Table leg according to claim 1 or 2, characterized in that the spring is a leaf spring ( 13 ) which is attached under prestress with its ends to the locking lever ( 12 ). 4. Table leg according to claim 3, characterized in that the leaf spring ( 13 ) is clamped with its ends in two slots located at a vertical distance from one another in the pivot lever ( 12 ). 5. Table leg according to claim 4, characterized in that the slots ( 13 ) are arranged in the pivot lever ( 12 ) so as to run obliquely in substantially the same direction. 6. Table leg according to one of claims 3 to 5, characterized in that the leaf spring rests with its central region against the inner tube ( 7 ).