Patent ID: 7775755

Claim:
A limit stop support device for fitting variable-width plasterboards upon an appliance for lifting and handling said boards, comprising a one-piece receiving support which fulfills various adjustable-position sliding functions along an arm of a board holder or panel holder of the appliance, the support receiving a board or panel limit stop which is retractable in opposition to elastic return means located in said receiving support and a locking unit which fulfills a dual function of locking the receiving support in position on the arm and limiting travel of the limit stop in opposition to the elastic return means in an operating phase in order to place boards and panels on a ceiling or wall, wherein the receiving support has a parallelepiped configuration and comprises a vertically and transversely open base part to allow, respectively, accommodation and guidance of the limit stop and to allow the limit stop to pass through and slide around the arm of the board holder or panel holder, the base part comprises in a central and transverse position a cavity through which said arm passes and is guided and two inner walls which act as an intermediate separator and delimit two chambers through which wings, shaped like a fork joint, of the limit stop pass and are guided, the base part of the receiving support is arranged with two opposite lateral outer walls having a shaped cut-out which matches protruding shapes on the wings of the limit stop, and a positioning plane of the limit stop and of the wings is parallel to a central guide path for receiving the arm of the board holder or panel holder so that the device can slide, the retractable limit stop has a U-configuration with an upper base and two shaped wings which fit in the chambers formed between the inner walls and opposite lateral walls, the wings are internally and externally arranged to slide and be guided in the receiving support and receive means of limiting travel of the limit stop, and the unit for locking the receiving support in position and limiting the travel of the limit stop comprises a horizontally placed U-shaped pin.