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 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 an extending position of the toggle levers, wherein the positioning device (40) has a stop surface (41) facing the lifting part (11), said stop surface abutting against a contact surface (60) of the lifting part (11) in the working position (A), wherein the positioning device (40) comprises a pylon (43) that, starting from the base part (17), extends through a cutout (50) in the lifting part (11) and bears, on an end of the pylon facing away from the base part (17), an abutment part (42) having the stop surface (41).