Abstract: A rapid releasable coupling for the tang of a work tool to a percussion apparatus. A tip of cylindrical shape extends the body of a percussion apparatus towards the front. Three longitudinal grooves are spaced an equal angle apart in the tip. A roller can move in each groove. Each roller has a pin with ends adapted to roll or slide on the edge of the groove. A ring threaded onto the tip and moveable longitudinally is returned rearward and against the rollers by a spring. The ring has section in the shape of a circular arc that partially surrounds the rollers. Displacement of the ring toward the front is by another ring which surrounds the assembly and which has an annular projection on its inner wall for holding the spring. A screw connection between the up and the other ring so that the other ring is moved longitudinally by being rotated.

Abstract: Peg-type device for the injection and retention of a treatment product in a masonry wall, of the type consisting of an elongated hollow body [1] in the shape of a slightly tapered, truncated cone, that is fitted at its rearward extremity with a splayed or flared portion in the shape of a truncated cone [10] and is fitted along its entire length with a series of flanges.

Abstract: An injection device is disclosed for the treatment of wood without the necessity of a rivet-set. The injection device has a deformable elastic body having an internal cavity intended to receive a conical injection head and including an anti-return valve system therein. The upper part of the body has a double wall which consists of an external wall and an internal wall. The external wall absorbs deformations due to the driving-in phase of the injection device. The internal wall insures the nondeformation of the circular ridge of the cavity to guarantee the seal between the conical injection head and the injection device during the injection phase of the treatment product.