Releasable coupling for a work tool to a percussion apparatus

A releasable rapid coupling for coupling a tang of a work tool to a tool assembly, the coupling comprising:

• an apparatus having a front adapted to extend toward the tang of the tool, a generally cylindrically shaped tip of the apparatus extending toward the front of the apparatus and shaped for receiving the tang of the tool in the tip;
• at least one longitudinally extending groove in the tip;
• at least one roller supported in the at least one groove for being movable forwardly and rearwardly longitudinally along the groove, and the groove being of a longitudinal length enabling such movement;
• the groove having an access cutout therein enabling the roller to engage the tang in the tip when the roller is in the groove;
• a roller engaging first ring located around the tip and movable forwardly and rearwardly with respect to the tip, the first ring being engageable against the roller for preventing the roller from moving forward;
• a spring supported to the tip and pressing the first ring rearwardly against the roller;
• a second ring disposed around the first ring, the roller, and the groove, the second ring having an inward protrusion which engages the first ring for setting the position of the first ring against the roller as the first ring is urged rearward by the spring;
• wherein upon forward movement of the second ring with respect to the roller and along the first ring, the second ring being so shaped as to then free the roller to move out of the groove for releasing the tang to move free of the tip;
• a screw connection between the second ring and the tip for causing rotation of the second ring around the tip in one direction to move the second ring forward for freeing the roller to move out of the groove, and for causing rotation of the second ring in the opposite direction for enabling the spring to urge the first ring against the roller to hold the roller in the groove.