Patent ID: 9475678
Filing Date: 2016-10-25
CPC Classification: B25J,B66C

Claim Text:
1. Load manipulator comprising: a boom arm and a return arm mounted parallel to each other and hinged at their ends by a loading bar and by a counterbar so as to form a deformable parallelogram, an approximately horizontal rotation axis on which the boom arm or the return arm is articulated, the rotation axis being supported by a frame, the rotation axis intersecting the boom arm or the return arm, the rotation axis not being free to translate relative to the frame during operation, and a balancing device applying forces including a force to compensate for a given value of the force due to the load, at an application point called the compensation application point, said compensation application point being a point on at least one of the counterbar and the arm among the boom arm and the return arm which is not articulated about the rotation axis such that it is always in line with a point of the loading bar at which the force due to the load is applied and a point on the rotation axis located in the plane of the deformable parallelogram, in which the balancing device comprises a first counterweight and a second counterweight designed to balance the manipulator at no load and a compensator for compensating the value of the force due to the load, the weight of the first counterweight and the force to compensate the given value of the force due to the load being applied on the compensation application point and the weight of the second counterweight being applied on the arm which is articulated about the rotation axis.