LIFTING APPARATUS HAVING A TOGGLE LEVER MECHANISM

摘要

A lifting apparatus includes a lifting part that can be moved in linear direction between a rest position and a working position. At least one drive device is disposed for moving the lifting part. Each drive device includes a toggle lever mechanism, having a first toggle supported pivotally on the lifting part and a second toggle supported on a base part. A positioning device prespecifies the position of the lifting part in lifting direction and in a direction transverse to lifting direction in working position. To do so, said toggle preferably has a stop surface against which the lifting part is pushed into working position by the at least one drive device. In this working position, the toggle joint angle α of the toggle lever mechanism is smaller than 180° so that the two toggles and are outside the extended position.

主权项

1. Lifting apparatus (10) comprising:
a lifting part (11) that can be moved in a lifting direction (H) between a working position (A) and a rest position (R), said lifting part having arranged on it a support unit (13) for supporting a workpiece and/or a clamping unit for mounting the workpiece, at least one drive device (18) arranged on a base part (17), said drive device comprising a toggle lever mechanism (22) and a drive (19) coupled with the toggle lever mechanism (22), wherein the toggle lever mechanism (22) comprises a first toggle lever (22a) hinged to the lifting part (11) and a second toggle lever (22b) hinged to the base part (17), said toggle levers (22a, 22b) being connected to each other on a toggle joint (31), a positioning device (40) that prespecifies the working position (A) of the lifting part (11) in such a manner that the toggle levers (22a, 22b) are located outside their extending position.