APPARATUS AT A VERTICALLY ADJUSTABLE WORK BENCH FOR GIVING A LINEAR VERTICAL MOVEMENT TO THE WORK PLATE

Abstract: The invention refers to an apparatus which at a vertically adjustable work bench gives a linear vertical movement to the work plate (1) which work bench comprises a support having vertical side portions (4) at which mutually parallel arms (6, 7) by means of a first end portion are mounted for a pivoting movement which pair of arms (6, 7) by means of a second end portion are also mounted for a pivoting movement at a vertically arranged raising beam (8) which by means of its upper portion is fixed to the work plate (1) or to a frame (2) comprised in said plate. According to the invention the two vertical side portions (4) of the support are provided with telescopic extensions (9) fixed to the plate (1) or its frame arranged to give to the same at the vertical adjustment a linear vertical movement. The raising beam (8) is at its fixing to the plate (1) or its frame (2) arranged sliding horizontally in relation to the same in order to make the linear movement of the plate (1) in the vertical direction possible.

Description: APPARATUS AT A VERTICALLY ADJ USTABLE WORK BENCH FOR GIVING A LINEAR VERTICAL MOVEMENT TO THE WORK PLATE TECHNICAL FIELD The present invention relates to vertically adjustable tables preferably work benches at which there is a need to fast and easily raise or lower the work plate depending on the work carried out or in order to change work position to avoid injuries by enabling an ergonomi- cally correct work position. This is particularly important when the same table is used by two or several persons of different tallness. BACKGROUND ART Several different types of vertically adjustable tables are available on the market. In the Swedish patent 501 178 a common vertically adjustable table is shown. This table comprises a support having vertical side portions and parallel pivoting arms which by means of a first end portion are journalled in said vertical side portions. The pivoting arms are by means of the other end portion journalled in a vertical beam, a so called load carrier the upper end portion of which is fixed to the plate or to the underside of a frame arranged on said plate. By means of gas supported springs acting on the pivoting arms the weight of the plate and the possible load on the plate can be eliminated and the vertical adjustment of the plate may be facilitated. This type of table has, however, the drawback that the plate when adjusted vertically is also moving horizontally. This horisontal movement causes problems if the work benches are to be set up in limited spaces, close to walls, in a group of benches or at co- operating benches or groups of benches. Tables at which these drawbacks have been eliminated have been available on the market. These tables have in common that they are using complicated mechanisms of different kinds which considerably raise the price of the tables. BRIEF DESCRI PTION OF THE I NVENTION The object of the present invention is to eliminate said drawbacks by providing a more simple and cheaper form of vertically adjustable tables. This is achieved by means of the apparatus the characteristics of which appear from the following claims. DESCRIPTION OF THE DRAWI NGS An embodiment of the invention will be described more in detail with reference to the enclosed drawing on which figure 1 , in a side view, shows a vertically adjustable table according to the invention, the figures 2A, 2B and 2C are also shown in a side view, but in somewhat smaller scale the same table with different vertical adjustments, more precisely in figure 2A the table in its highest position, in figure 2B the table in an intermediate position and in figure 2C the table in its lowest position. Figure 3 shows in section and in a front view a frame comprised in the plate of square tubes which frame by means of a guide arrangement is connected to a raising beam arranged for vertically adjusting the level of the plate and figures 4A and 4B show in released position and locked position respectively a locking mechanism arranged for locking the frame in relation to the raising beam. PREFERRED EMBODIMENT In figure 1 a vertically adjustable table is shown the plate 1 and associated frame 2 of which rest on a support arranged to be put on the floor one of the side portions of which support is generally designated 3. In the side portion 3 of the support a vertical side portion 4 is comprised which by means of beams, not shown, is connected to a corresponding side portion of the opposite side portion of the support, not shown. The side portion 4 rests on a foot 5 which extends along the whole side. I n the vertical side portion 4 are additionally mutually parallel arms 6, 7 by means of a first end portion mounted for a pivoting movement which pair of arms by means of a second end portion are also mounted for a pivoting movement at a vertically arranged raising beam 8 which by means of its upper portion is fixed to the frame 2 in such a way that it at vertical adjustments can be displaced horizontally in the direction towards or away from the side portion 4. At vertical adjustments of the plate this plate is guided by means of a guiding means 9 associated with the vertical side portion 4 giving the plate a vertical linear movement. This vertical linear movement is possible due to the fact that the upper end portion of the raising beam, as mentioned above, is con- nected to the frame 2 moveable in the horisontal direction. The vertical movements are facilitated by a gas supported spring 10 ar- ranged between the side portion 4 and the upper of the parallel arms 6. The plate 1 is locked in the desired position by means of a hydraulic damp and locking cylinder 7 arranged in the arm 7. The figures 2A, 2B and 2C are also showing in a side view, but in somewhat smaller scale, the same table as in figure 1 with different vertical adjustments, more precisely in figure 2A the table in its highest position, in figure 2B the table in an intermediate position and in figure 2C the table in its lowest position. The figures illus- trate on one hand the extent of the displacement of the raising beam 8 in the horisontal direction and on the other hand the change of length of the guiding means 9 at different vertical positions. Figure 3 shows in section and in a front view on one hand a part of the plate 1 and on the other hand the frame 2 which is made of square tubes which frame by means of a guiding means 1 1 with bearing balls is arranged movable horizontally connected to an angle-iron 12 arranged at the upper end portion of the raising beam 8. For locking the raising beam 8 in relation to the frame 2 a locking mechanism 1 3 is arranged journalled in the frame 2. A pivoting wedge 14 forming part of the locking mechanism is reaching into the space between the frame and the angle-iron 12. This locking mechanism is controlled by means of a wire 15 which is illustrated in figures 4A and 4B which figures show the locking mechanism 13 with its pivoting wedge 14 in locked and released position respectively. When the wire is not activated the locking mechanism 13 is caused to lock by means of a spring 16 in which position the pivoting wedge 14 is pressed against the frame 2 as well as the angle- iron 12 which is shown as a detail within the circle in figure 4A. The corresponding released position is shown in figure 4B and its detail. The control wire is connected to a pedal which suitably is arranged at the foot of one of the side portions. The control wires to the hydraulic locking cylinders 17 are connected to the same pedal.

Claims: CLAIMS 1 . Apparatus which at a vertically adjustable work bench gives a linear vertical movement to the work plate (1 ) which work bench comprises a support having vertical side portions (4) at which mutually parallel arms (6, 7) by means of a first end portion are mounted for a pivoting movement which pair of arms (6, 7) by means of a second end portion are also mounted for a pivoting movement at a vertically arranged raising beam (8) which by means of its upper portion is fixed to the work plate (1 ) or to a frame (2) comprised in said plate. The apparatus is characterised in telescopic extensions (9) arranged at the two vertical side portions (4) of the support which are extendable by means of guiding means or the like and are fixed to the plate (1 ) or its frame arranged to give at the vertical adjustment of the plate (1 ) a linear vertical movement to the same and in that the raising beam (8) at its fixing to the plate (1 ) or its frame (2) is arranged sliding horizontally in relation to the same in order to make the linear movement of the plate (1 ) in the vertical direction possible. 2. Apparatus according to claim 1 characterised in that the plate (1 ) can be set to a desired level and be fixed in the same in that the parts (2, 12) in a guiding means which make the horisontal movement of the raising beam in relation to the plate (1 ) possible can be locked in relation to each other.

Inventors: YTTERHAG ARNE, YTTERHAG, ARNE
Applicants: INERGO PROD AB, YTTERHAG ARNE, INERGO PRODUKTION AB, YTTERHAG, ARNE
Application year: 1998
Main classification: A47B9
IPC codes: A47B9, B25H1