Patent ID: 11951577
Assignee: MANITOWOC CRANE GROUP FRANCE
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 23:
24. A dismounting method for dismounting a connecting pin used for an end-to-end assembly of two frame elements of a crane structure, the dismounting method comprising:
providing the mounting/dismounting device of claim 1;
mounting the connecting pin, of tubular shape, through the two frame elements in order to assemble them, and the connecting pin has a distal end provided with an enlarged head and a proximal end which are opposite to each other, the enlarged head being disposed on a first side of the structure;
setting up the base on the structure with the nut being disposed on the first side of the structure in alignment with the connecting pin, and with the bushing which is mounted on the base, on the first side of the structure, and which is interposed between the nut and one of the two frame elements, the first open end of the bushing surrounding the enlarged head of the connecting pin;
pressing and passing the mounting/dismounting rod through the connecting pin and the bushing until the threaded distal portion comes into contact with the nut;
coupling the head of the mounting/dismounting rod to a bit of a screwdriver, which is located on a second side of the structure, opposite the first side of the structure;
activating the screwdriver to screw the threaded distal portion into the nut, leading to an axial displacement of the proximal stop which comes into abutment against the proximal end of the connecting pin, thus pushing the connecting pin axially in a direction from the second side towards the first side of the structure, so that the connecting pin comes out at least partially from the two frame elements while entering inside the bushing; and
once the proximal stop is in abutment against one of the two frame elements, activating the screwdriver in the opposite direction to unscrew the threaded distal portion from the nut and then remove the mounting/dismounting device.