Abstract: A male terminal is formed on a dust collecting device so as to protrude therefrom, while a plug-in port into which the male terminal can be inserted, and a female terminal that is located inside the plug-in port and can be electrically connected to the male terminal, are provided in a hammer drill. When the dust collecting device is joined to the hammer drill and the male terminal is electrically connected to the female terminal, a driving source is supplied from a battery pack to the dust collecting device.

Abstract: Disclosed is a drilling and/or striking hammer that includes a lubricating device having a lubricant reservoir and a volume of lubricant contained therein. The lubricating device conveys lubricant to at least one a transmission system within the hammer's housing, a percussion system, and/or a tool holder at a variable dosing or flow rate. The dosing or flow rate varies as a function of tool stress which can include use intensity and/or temperature. A flexible tube extends between the reservoir and the lubricated component(s). At lease part of the flexible tube vibrates with the lubricated components during use and modifies a viscosity of the lubricant therein, based on tool use intensity. A pressure generating device can pressurize the lubricant, helping convey the lubricant to a targeted area for lubricating movable parts.

Abstract: A rock breaking machine and to a method of lubricating a tool of a rock breaking machine. The lubricating system comprises at least one lubricant channel (23) into which lubricant is fed by a lubricating device (24). Lubricant is supplied to the bearing members (19) of the tool (6, 13) of the rock breaking machine. The lubricating device comprises a lubricant container (25) and a transfer device (26). The transfer device (26) controls the feed of lubricant into the lubricant channel. The lubricant container (25) is integrated into the body (17, 18) of the rock breaking machine.

Abstract: A hydraulic drilling outfit has a hydraulically driven hammer drill which is fastened pivotally to a hydraulic thrust unit. A control for the hydraulics utilizes the flushing water for the drill bit as the power-source for all of the motions executed by the drilling outfit. One hydraulic supply line to the control of the thrust unit and one line from the control to the hammer drill are sufficient for operating the system in an open circuit. A rotary slide valve simultaneously controls the thrust and withdrawal motions as well as the operational states of drilling and not drilling. The desired value adjustment for the speed of thrust is arranged on the rotary slide valve.

Abstract: This invention pertains to a hydraulic reciprocating device having a housing and a piston in the housing. The piston has a first and second surface, and a means for intermittently communicating the first surface of the piston with a hydraulic pressure source. Also provided is a means for continuously communicating the second surface of the piston with pressurized fluid such as pneumatic fluid. The piston moves in a first direction when the hydraulic pressure source communicates with the first surface of the piston and the piston moves in a second direction when the hydraulic pressure source does not communicate with the first surface of the piston.