Abstract: A handgrip in a handle structure for hammer tools comprises a wing-shaped portion for applying a thrust force on the tool. The force of the recoil which occurs when impacts are delivered is absorbed by the mass of the hand and arm and by the resilience of the limbs of said parts of the body. To advantage, the handgrip is turned when the pressure-applying-grip is changed to a lifting-grip.

Abstract: An elastomer muffler for the exhaust of a pneumatic percussive tool, which comprises an outer and an inner side wall. The cross-sections of the side walls are C-shaped and the side walls are longitudinally unified for forming a cavity therebetween. The muffler is detachably mounted to the tool by resilient snap action. To advantage, the muffler may be used in connection with a pusher leg arrangement for a rock drill. The muffler, then, is mounted on the pusher leg and the inlet mouth thereof is arranged substantially concentrically with the axis of the hinge connection between the pusher leg and the rock drill but spaced axially from said hinge connection. The exhaust port of the rock drill is also substantially concentrically with the hinge connection but spaced axially therefrom.