Abstract: A pivot motor, particularly for a vibration exciter for construction machines, has a pivot motor housing that is mounted so as to rotate on a pivot motor shaft. At least two pressure chambers to which a hydraulic oil is to be supplied are provided, by way of which oil the pivot motor can be driven. The pivot motor shaft is provided with an axial bore, into which a lance disposed in torque-proof manner projects, through which lance axially at least two channels for supplying oil to the pivot motor are passed, which end in ring grooves introduced on the outside of the lance, at least in certain regions, at a distance from one another. Radial bores for connecting the at least two ring grooves of the lance with the at least two pressure chambers are introduced into the pivot motor shaft.

Abstract: A gas powered device includes a vaporisation system. The vaporisation system includes a conduit connected at one end, or configured to connect at one end, to a regulator for a high pressure fluid source. The other end of the conduit supplies an operating mechanism of the device The path of the conduit is such that a substantial length of the conduit is adjacent the operating mechanism.

Abstract: An integrated module of cylinder and reversing assembly of a reciprocating pneumatic tool is arranged between an air pressure guiding seat and a guiding cylinder of piston rod in the groove of a reciprocating pneumatic tool. The integrated module includes a cylinder body with a hollow body shaping an inner/external end and a chamber. The chamber is used for accommodating the piston of the piston rod. Several air flow ducts are laterally set at interval onto the chamber. A reversible actuating slot is recessed into the inner end of the cylinder body, and provided with a through-hole connected with the chamber of the cylinder body. A reversing brake block is accommodated movably into the reversible actuating slot. A spacing ring is accommodated into the reversible actuating slot to limit the reversing brake block. The cylinder and flow reversing body can be combined to simplify the structural members.

Abstract: A vibration generating device is provided. Where a bucket link is replaced by the vibration generating device, the vibration generating device is connected to a main operating valve by conduits. Since both flow rate control valve and fluid motor are housed within a casing, a high pressure conduit for connecting the vibration generating device and main operating valve is not necessitated, thereby making the structure compact, and making the working of conduit arrangement easy and improve reliability. The center axial line of the cylinder chamber, rotary axial line of the valve element of the rotary valve and center axial line of the valve element of the flow rate valve are made parallel to one another so that these cylinder chamber, rotary valve and flow rate control valve are arranged in a superposing fashion, thereby making the entire vibration generating device compact.

Abstract: A pneumatic linear vibrator comprises a piston guide sealed on one side and delimited by detachable end parts (14,16), a piston (10), a sound-absorbing pipe (52) which forms the housing, and means for supplying and removing a gaseous or vaporized pressure medium. Relative motion between the guide with the end parts and the piston is ensured by automatic alternating delivery of the pressure medium to a working volume (V,V1,V2) located on one face of the piston. The piston (10) has a longitudinal axial bore (22) with a snap ring groove (26) in the region of the ends of the longitudinal median plane of the piston. The snap ring grooves are connected to a face of the piston (10) by at least two axisymmetric channels (27) which run in the axial direction (A) and are sealed off from the longitudinal axial bore (22) of the piston (10).

Abstract: Miniature engine operated by an expanding gaseous fluid, which comprises a cylinder (18), piston (20) and inlet valve (29), the upper part of the piston (20) cooperating with a radially expansible resilient diaphragm (28), which is secured to the piston (20) and performs momentarily a pneumatic seal-engagement function along the periphery of said cylinder (18) during the gaseous expansion phase.

Abstract: A pavement breaker having a valveless piston reciprocating cycle is disclosed. Means is provided for cushioning the shock effect transmitted by the reciprocating piston to the outer housing.

Abstract: A hydraulically operable hammer and more particularly a hydraulically operable hammer having improved cycling of a hammer piston reciprocable therewithin.

Abstract: Hydraulically powered percussive apparatus for breaking rock, drilling etc. in which a combined spool valve and hammer reciprocates in the bore of a cylinder structure. A high pressure fluid inlet leads to the bore and a low pressure outlet leads from the bore. A fluid flow passage communicates with the bore at two axially spaced locations. As the hammer reciprocates, it cyclically connects, via the bore, the inlet to the passage and the outlet to the passage. Pressures in the inlet and outlet fluctuate between fairly narrow limits whereas the pressure in the passage fluctuates between a pressure approximating inlet pressure and a pressure approximating outlet pressure. The hammer has two operating faces. The first of these is exposed to the relatively steady inlet pressure and the second is subjected to the widely varying pressure in the passage.

Abstract: A down-the-hole hammer of the type adapted for receiving a bit at the lower end and for being connected to the lower end of a drill string through which compressed air is supplied to the hammer. The supply of air to the hammer when the bit at the lower end is resting on the bottom of the hole causes a piston in the hammer to reciprocate and to beat upon the upper end of the bit so that the material at the bottom of a hole is reduced. The piston, by reciprocating in the hammer, accomplishes the valving of the fluid which causes the piston to reciprocate, and when the hammer is lifted from the bottom of the hole and the bit moves downwardly, the piston ceases reciprocation while air blows off through the bit to the bottom thereof to clear debris from the hole being drilled.

Abstract: A fluid operated reciprocating piston rock drill wherein the piston has a stem portion closely slidably received in a guide bushing and the cylinder of the rock drill provides clearance space around the head of the piston.