Device having a quick coupling system for fastening an exchangeable head

An exchangeable tool head for performing work on a workpiece in cooperation with a power tool including:

• a tool body, a hydraulic cylinder having a main piston, a quick coupling system arranged on tool body and including an actuation unit, and a locking unit movable by the actuation unit between a released position and a locked position;
• and the exchangeable tool 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.

An 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
• an exchangeable tool 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;
• and
• wherein the quick coupling system is removably connectable to the circular groove of the exchangeable head, such that when in the locked position of the locking unit, the exchangeable head is secured to the tool body with the half rings extending inside the circular groove, and in the released position, the exchangeable head can be removed from the tool body;
• 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, and
• 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;
• and

A method for mounting an exchangeable tool head to a hydraulic tool 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 is in the locking 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 insertion head further along the insertion axis toward the tool body such that the chamfer pushes the locking unit from the locked position toward a released position,
• moving the insertion 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 return in the locked position;
• and
• wherein the connection between the exchangeable head and the tool body requires a pushing force of at least 80 Newtons.