Importance

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Abstract

The invention relates to a device for initiating a lifting movement in a lifting mechanism, for instance in lifting tables, of the type of which includes at least one first lifting arm (3) and one second lifting arm (4) being articulatedly interconnected by means of a first joint (10). The lifting mechanism also includes a force applying means (5) acting on one of the lifting arms, the force applying means (5) and the lifting arms (3, 4) in the initial position, before the initiation of the lifting movement, being oriented generally parallel with respect to each other in a common plane in order to achieve a low constructional height of the lifting mechanism. The force from the force applying means (5) is transmitted to the first lifting arm (3) via a double-armed lever (13) connected to the first lifting arm (3) by means of a second joint (17), the force applying means (5) acting on one part (19) of the lever (13) via a third joint (11) in such a way that the force from the force applying means (5) is transmitted eccentrically relative to the second joint (17), the second part (20) of the lever (13) acting against a lever support (15) provided on said second lifting arm (4), preferably between said first joint (10) and said second joint (17). A first abutment (21) on the lever (13) engages the second abutment (14) provided on that first lifting arm (3) after a limited movement of the lever (13) corresponding to the initiation of the lifting movement. By this means the lever (13) is blocked against movement relative to the first lifting arm and is disengaged from the second lifting arm (4) during the continued lifting movement, which results in that the force from the force applying means (5) entirely is transmitted to the first lifting arm (3).

First Claim