Abstract: A hammer device in the form of a needle gun. The gun includes a cylinder housing containing a cylinder, in which a flying piston is displaced and an anvil, against which the piston strikes. A needle carrier is located on the anvil, and the needles of the gun are held in the carrier so that the needles can be longitudinally displaced. To reduce the wear on the needle carrier and to preserve the needle heads of the needles, the needle carrier is configured from several layers, at least in the vicinity of the guide plate. The layers are of alternating hard and soft material.

Abstract: A press device to be modified such that profile rods can also be removed by a shearing movement. The tool is configured so that a cutting plate can be fixed to each pivoting arm and is displaceably mounted in the opposite pivoting arm. The clamping arms of the pivoting arms have a fork-shaped slit and the cutting plates are maintained in the clamping arms with fixing bolts.

Abstract: It is suggested to machine contaminated surfaces, in particular radioactively contaminated concrete surfaces and masonry with pneumatically actuated striking tools. It has been shown that this is an extremely low-dust machining method with which the essentially the particles are struck off in the size order of 0.2 to 2.0 mm. The method may be realized with a device (1) with which in a housing (2) several chambers are arranged over one another. Most preferred at the top a pressurized air feed chamber (10) is fed via a pressurized air connection (3). Therebelow there is located a pressurized air suction chamber (12) which comprises a suction connection (4). At the bottom there is arranged a collecting chamber in which chisel-like hammer bolts (51) are effective. The hammer bolts which are part of the striking tools (5) project out of the housing (2).