Mechanical handling arm with elbow joint cantilevers - projects from post and has upper arm of pinned parallelogram with jack as bracing stay

摘要

The mechanical handling arm cantilevers from a vertical post (1) and has an intermediary joint (15, 16). The arm length (2) nearer the post (1) comprises a pin-jointed parallelogram (9, 11) the arm can pivot about a vertical axis (10) through the post, and the outer arm length (3) can pivot about a vertical axis (22) through intermediate joint. An inclined jack (18, 19) in a bracing position between the post (1) and the inner arm (11) is used to lift or secure the arm at a desired inclination. The arm, thus, resists all vertical forces. The free end of the arm has a plate for the connection of lifting hooks etc. together with a jack control lever (23). The parallelogram is of elongated form with the long members (9, 11) parallel to the long arm axis. The short vertical members of the parallelogram are formed by a plate (12) and the post head (8) to which the long members are pinned (13-15).