An apparatus to remember an angle and its use for lasthaandtering

摘要

A device for seizing and handling a load which has a given inclination includes a frame which is adapted to be suspended at a point of the frame from a handling machine. The frame is adapted to be locked to the load. A device is provided for shifting the suspension point in a reference direction relative to the frame. A level detector is mounted on the frame to pivot in a vertical plane parallel to the reference direction and produces a signal when it deviates from a horizontal position. The device for shifting the suspension point is responsive to the signal and shifts the suspension point, upon the hoisting of the load, to a position in which the load cancels out the deviation from horizontality of the level detector. Regulating apparatus regulate the relative angular position of the detector relative to the frame in the vertical plane so as to bring the detector to a horizontal position in which it stores the given inclination of the load. A control device responsive to the signal of the detector controls the regulating apparatus in such manner as to automatically pivot the detector to the horizontal position prior to the hoisting of the load. A device inhibits the control device so as to maintain, in the course of the hoisting of the load, the level detector in the relative position in which it stores the given inclination of the load.