Patent ID: 11931875
Assignee: DUBOIS ET CIE S.A.A
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 10:
11. A method for mounting an exchangeable tool head to a hydraulic tool in preparation for performing work on a workpiece, the method for mounting comprising the following steps:
providing a hydraulic tool comprising:
a tool body extending longitudinally along a tool axis to a free end;
a hydraulic cylinder, the hydraulic cylinder including a main piston movable inside the hydraulic cylinder under the effect of an injection of pressurised fluid into an interior of the cylinder;
a quick coupling system arranged at the free end of the tool body and comprising:
an actuation unit; and
a locking unit movable by the actuation unit between a released position and a locked position to secure the exchangeable head to the tool body, and the locking unit comprises a first half-ring and a second half-ring radially movable between the released position and the locked position; and
wherein in the locked position the locking unit is adapted to secure the exchangeable head to the tool body, such that transmission forces can be exchanged between the exchangeable head and the main piston;
wherein in the released position the locking unit is adapted to release any force applied to the exchangeable head in order to remove the exchangeable head;
wherein the locking unit starts in the locked position; and

providing an exchangeable head comprising:
a functional part adapted to apply a force to the workpiece; and
an interface part for coupling with the tool body via the quick coupling system, and the interface part comprises:
a circular groove adapted to receive the locking unit;
a chamfer for facilitating the insertion of the head within the power tool; and
a recess for partly receiving the main piston;

inserting the exchangeable head within the tool body by pushing the exchangeable head along an insertion axis, such that a portion of the main piston enters the recess provided on the interface part and the chamfer contacts the locking unit;
moving the exchangeable head further along the insertion axis toward the tool body such that the chamfer pushes the locking unit from the locked position toward the released position,
moving the exchangeable head still further along the insertion axis toward the tool body such that the locking unit faces the circular groove and the locking unit automatically returns to the locked position; and
wherein the connection between the exchangeable head and the tool body requires a pushing force of at least 80 Newtons.