Abstract: Disclosed herein is a silencer constituted by a casing, open at the lower extremity made to communicate with the source of compressed gases, and closed at the top by a cover, inside which are placed, from the bottom upwards, a first element, a filter and a second element which, jointly with the inner surface of the casing, define a first, a second and a third expansion chamber, respectively, for the compressed gases.The first expansion chamber communicates with the open extremity of the casing, the second contains the aforementioned filter, while the third, via a slit made in the cover, communicates with the outside. The first and second expansion chamber are inter-communicating because of through holes drilled in the first element, and likewise the second and third expansion chamber are inter-communicating because of through holes drilled in the second element.

Abstract: A pneumatic gun for forcibly inserting fixing elements, such as nails, metal staples and the like. The gun has an operating piston, carrying an arm for firing the fixing elements. The arm slides in a cylinder open at one extremity towards a compressed air tank provided in the stock of the gun. The operating piston is moved by a control piston located above the open extremity which, in turn, is operated by a valve, which is actuated by the trigger of the gun and is movable between two extreme positions. The gun is equipped with an efficient safety device and is so constructed that no torsional stress is applied to the compressed air infeed duct; and so that it can be easily locked onto a suitable support.