Abstract: Control device of an impact mechanism operable by a pressure media having an element for reversing the axial pressurization of the percussion piston and the return of the medium. In order to achieve a controllability of impact mechanisms by which the energy and the frequency of the moved percussion piston can be adjusted, at least one channel switchable by the reversal as a return line for the medium from the percussion hammer has at least one switchable element for the flow control.

Abstract: In a hand-held power tool, in particular an impact drill driver, having a gearbox assemblage, a hammer impact mechanism, and a tool spindle, the gearbox assemblage includes at least one gear stage element which is provided in order to split a power flow so as to make available different rotation speeds for an impact mode and a rotation mode.

Abstract: Impact tool and method for a hammer device that includes impact tool housing and tubular piston structured and arranged for axial displacement in impact tool housing via pressure medium. Tubular piston has essentially radial pressure surfaces structured and arranged on opposite portions of tubular piston to be acted on with pressure medium. Grooves are formed in impact tool housing that are structured and arranged for a reversal of a direction of a pressure medium impingement on pressure surfaces and discharge or recirculation of medium. Grooves include a control recess formed in tubular piston and at least two control grooves for a shift of pressure medium impingement on pressure surfaces that are arranged axially offset in impact tool housing. A controller is structured and arranged to alternatively activate one of the at least two control grooves via connection channels.

Abstract: A method for lubricating a drill shank of a rock drilling machine, wherein at least part of the flow of the pressure fluid of a hydraulic circuit of a device of the rock drilling machine performing at least one function is directed to the rotation mechanism of the drill shank for the purpose of lubricating the rotation mechanism of the drill shank.

Abstract: A percussion adapter for a positive displacement motor including a housing, a torque tube and a reciprocating percussive piston operable by application of fluid pressure thereto. The piston can be driven to create a percussive effect by rotary movement of the torque tube. The percussion adapter can have a bypass option to allow flow through the percussion adapter without operation of the piston.

Abstract: A compact pneumatic hand tool having a cylinder assembly received in a space of a body, wherein, the bottom inlet opening of the cylinder assembly is communicated with the air inlet in the space, meanwhile, the rear inlet passage of the cylinder assembly is corresponded to the control knob mounting portion of the body. Moreover, a control knob is extended through the control knob mounting portion of body as well as the rear inlet passage of the cylinder assembly, and a rotor of the cylinder assembly is coupled with a second coupling portion of a striking assembly. In addition, the front opening of the body is covered with the front cap and a sealing pad is provided between the body and the front cap, meanwhile the central axle is extended out of the front cap.

Abstract: A compact pneumatic hand tool composed of a body, a cylinder assembly, a sealing pad, a striking assembly, a front cap, a control knob, a ventilation cap and threaded bolts. A first bearing is mounted around a rear end of the striking assembly and an outer rim of the first bearing is securely received in a central hole of the cylinder assembly. A second bearing is mounted on a central shaft of the rotor in the cylinder assembly. The control knob is mounted on the cylinder assembly. A front end of the central shaft of the striking assembly extends out of a front cap and the body is connected to the front cap via threaded bolts so that the striking assembly and the cylinder assembly are sealingly enclosed between the front cap and the body to accomplish the compact and light-weight requirements.

Abstract: A compact pneumatic hand tool composed of a body, a cylinder assembly, a sealing pad, a striking assembly, a front cap, a control knob, a ventilation cap and threaded bolts. A first bearing is mounted around a rear end of the striking assembly and an outer rim of the first bearing is securely received in a central hole of the cylinder assembly. A second bearing is mounted on a central shaft of the rotor in the cylinder assembly. The control knob is mounted on the cylinder assembly. A front end of the central shaft of the striking assembly extends out of a front cap and the body is connected to the front cap via threaded bolts so that the striking assembly and the cylinder assembly are sealingly enclosed between the front cap and the body to accomplish the compact and light-weight requirements.

Abstract: Generally, a pneumatic rotary tool of the present invention comprises a housing formed of a plastic material and includes a motor receptacle having a front end and an open rear end. An air motor is disposed within the motor receptacle of the housing. An air inlet passage extends to the motor for delivering pressurized air to the motor to power the motor to drive an output shaft. An end plate of the motor has air passaging formed therein, at least part of the air passaging defining a portion of the air inlet passage. A torque selector is at least partially received in the end plate and includes a portion disposed in the air passaging defined in the end plate and at least partially blocking the flow of air in the air passaging except through the portion of the torque selector.

Abstract: A driver attachment (12) for a collated screwstrip (13) carrying screws (16) in which a slide body (20) is slidable in a housing (18) parallel a longitudinal axis (52) about which a drive shaft (34) is rotatable. The slide body (20) receives a screwstrip (13) such that a screw feed activation mechanism coupled between the housing (18) and the slide body (20) advances successive screws (16) into a position to be driven by the drive shaft (34) with relative sliding of the slide body (20) relative the housing (18) between an extended and a retracted position. A latch system is provided to latch the slide body (20) to the housing (18) against extension towards the extended position beyond an extension limit position. With the slide body (20) and housing (18) latched together, the drive attachment (12) may be used to drive or withdraw separate screw (16) independently of the screwstrip, with or without the screwstrip (13) engaged in the slide body (20).

Abstract: Pressure fluid operated percussion drilling machine comprising a frame (1) forming a cylinder space (2) for an axially movable percussion piston (3). The frame is provided with channels (4,7) connectable to a pressure fluid source (5) and to a pressure fluid container (8) respectively for pressurizing the cylinder space alternately on each side of the percussion piston in order to move it back and forth. The frame is also provided with means (12) for connection of a drilling rod (13) to the frame for directing strokes on the drilling rod by means of the percussion piston. A pressure fluid operated rotation mechanism (18) is mounted on the frame for rotating the drilling rod, which mechanism is connected to said channels for rotating the mechanism by means of a pressure fluid. The frame is provided with two outlet channels (7,19) terminating in the cylinder space at a distance from each other in the direction of movement of the percussion piston.

Abstract: A drilling machine including a rock drill comprising a striking piston fitted to reciprocate in a cylinder. The piston is driven by a pressure medium. A rotation motor is provided and is driven by a pressure medium. A pump piston is permanently connected to a striking piston in concentric relation and arranged to travel in a pump cylinder. The cylinder is concentric with the cylinder that operates the striking piston and is axially spaced therefrom. The pump piston is arranged to provide a pump pressure medium to the rotation motor.

Abstract: A hydraulic rotary and percussive device, for example a hand-held hammer or a rock drill, comprises hydraulic reciprocatory percussive means and hydraulic rotary drive means. The means are connected in series hydraulically with the rotary drive means on the exhaust side of the reciprocatory percussive means. The rotary drive means comprise a drive motor actuated by an exhaust pressure pulse on the return stroke of the reciprocatory percussive means, a rotary bush in which a tool is received and a ratchet mechanism coupling the motor to the bush. Valve means are provided by which the rotary drive means can selectively be rendered operative or inoperative.

Abstract: An air-powered, self-feeding screw driving tool and screw-containing pods capable of being assembled into a continuous belt of screw-containing rods for use with the tool. The belt of screw-containing pods are coiled within a canister for selective feeding therefrom by an air-powered pawl operated star wheel. The pods are sequentially positioned forward of the bit of a carriage mounted air-powered screwdriver which is selectively operated in coordinated relationship with the orientation of the screw-containing pods by a common air source utilizing a single trigger control.Each of the screw-containing pods has means therein to retain a screw and to guide the screw as it is being driven into the workpiece.