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).

Abstract: A dust suppression guard includes a shroud defining an enclosed space. The guard also includes a clamp mounted adjacent a first end of the shroud, a reinforcing member attached to a central portion of the shroud, and a boot attached adjacent a second end of the shroud. The dust suppression guard also includes a hose mounted to and extending through the shroud in communication with the enclosed space. A dust suppression system may include a vacuum source having an attached vacuum hose, where the vacuum hose connects to the hose mounted to and extending through the shroud.

Abstract: A rock drilling machine comprising a rotating device (1), a percussion device (2) and a shank (17) where a tool (18) is to be fastened. According to the inventive idea, lubricant used for lubricating the shank is supplied in suitable conduits to pressurize the holes (3a′-3f′) of coupling bolts that join together the different parts of the drilling machine and delivered further in suitable conduits to serve as lubricant on the bearing surfaces between the rock drill and the feed equipment (21).

Abstract: A suction drill unit for the installation of a drill dowel (2) into rock, concrete, masonry and similar materials has an insertion end (3) for insertion into an at least partially rotary and percussive acting hand tool drilling device, with a reduced diameter shank (7) having an open suction passageway (9) extending axially through the shank (7) towards a bit head (8) and a rearward radial communication passage (10) connected thereto for suction-tight communication with a non-rotary suction head (11), wherein the drill bit head (8) is formed with an eccentrically arranged bit head tip (12) for boring of a hole (14) having a diameter (D) greater than that of the drill bit head diameter (B).

Abstract: A power tool of the type comprises a housing (10), a rotation motor (11), an output shaft (12) carrying and rotating a working implement, and a grease lubricated angle drive (13) coupling the output shaft (12) to the motor (11), wherein the angle drive (13) includes a gear chamber (30) containing lubricating grease, a pinion (16) connected to the motor (11), and a bevel gear (17) secured to the output shaft (12). An immovable wall element (24) located in a close vicinity to the bevel gear (17) forms a grease screen for preventing a great part of the grease volume in the gear chamber (30) from getting into direct contact with the bevel teeth and being hot agitated.

Abstract: A dust suppression guard includes a shroud defining an enclosed space. The guard also includes a clamp mounted adjacent a first end of the shroud, a reinforcing member attached to a central portion of the shroud, and a boot attached adjacent a second end of the shroud. The dust suppression guard also includes a hose mounted to and extending through the shroud in communication with the enclosed space. A dust suppression system may include a vacuum source having an attached vacuum hose, where the vacuum hose connects to the hose mounted to and extending through the shroud.

Abstract: A suction module for an electrical hand-held power too land including a housing (11) at least partially receivable in the battery-receiving chamber (15) of the power tool (1) in the power tool, electrical conductors (9) for connecting the module housing (11) with a power source (10), battery contacts (16) for electrically connecting the module housing with the power tool (1), an aspirator (13) having a drive motor (14) for producing vacuum and located in the module housing (11), with the aspirator (13) being connectable with a suction head (7) arrangeable in a region of a working tool.

Abstract: A tool for drilling and/or chiseling for use with a hand-held mechanized tool having a suction device (10) including a housing (11) surrounding the tool (1), with the tool (1) including a tubular shaft (2) and a connection member (3) located opposite a front end of the shaft (2) for connecting the shaft (2) with the housing (11) of the suction device (10) and having a diameter larger than a diameter of the shaft (2), and with the connection member (3) being formed of a core (5) surrounding the shaft (2), and an adapter (6) surrounding the connection member core (5) and having a cross-bore (7) opening into the through-channel (8) formed in the shaft (2).

Abstract: A tool for effecting drilling and/or chiseling and including a tubular shaft (2, 22) having an axially extending through-channel (8, 28) and provided, at one of its axial ends, with a drilling or chiseling head (5), and a connection member (3, 23) connected with another of axial ends of the shaft and provided at its end remote from the shaft (2, 22) with a shank (4, 24), the through-channel (8, 28) being connected with the tool circumference by a cross-bore (7, 27), and the largest cross-sectional surface (A1, A4) of the connection member (3, 23) corresponding at least to 2.5 times of the largest cross-sectional surface of the shank (4, 24).

Abstract: A tool for effecting drilling and/or chiseling and including a tubular shaft (2) provided, at its one axial end, with a cutting head (5), and a connection member (3) provided at another axial end of the shaft (2) and equipped with a shank (4), with the connection member (3) having a cross-bore (7) opening into the through-channel (8) formed in the shaft (2) and, with the connection member having, along a substantial portion of its axial extent, a diameter (d1) that at most corresponds to 1.6 of a diameter (d2) of the shank (4).

Abstract: A tool for drilling and/or chiseling for use with a hand-held mechanized tool having a suction device (10) including a housing (11) surrounding the tool (1), with the tool (1) including a tubular shaft (2) and a connection member (3) located opposite a front end of the shaft (2) for connecting the shaft (2) with the housing (11) of the suction device (10) and having a diameter larger than a diameter of the shaft (2), and with the connection member (3) being formed of a core (5) surrounding the shaft (2), and an adapter (6) surrounding the connection member core (5) and having a cross-bore (7) opening into the through-channel (8) formed in the shaft (2).

Abstract: The present invention is an improved drill head unit in which the lower portion of the drill chuck has a lobed shaped cross section which fits into a corresponding lobed shaped opening in a shaft connected to a spiral bevel gear mounted for rotation about a vertical axis. The lobed shaped cross section replaces the spline drive previously used in such units. An improved and simplified radial elastomeric seal is provided to separate a vacuum pressurized cavity in the housing from a lubricating cavity in the housing, and the seal is replaceable by removing a cartridge in the bottom of the drill head unit.

Abstract: The present invention is an improved drill head unit in which the lower portion of the drill chuck has a lobed shaped cross section which fits into a corresponding lobed shaped opening in a shaft connected to a spiral bevel gear mounted for rotation about a vertical axis. The lobed shaped cross section replaces the spline drive previously used in such units, and the spiral bevel gears replace the bevel gears previously used. An improved and simplified radial elastomeric seal is provided to separate a vacuum pressurized cavity in the housing from a lubricating cavity in the housing, and a locking mechanism locks against the drill steel such that the drill steel can be withdrawn from a drilled hole by lowering the drill head unit.

Abstract: An electric hand saw has a stationary sword having a lower side, a reciprocatable saw blade received in the lower side of the sword and having a rear end portion, a machine housing having a transmission outlet in which the rear end portion of the saw blade is received. The machine housing has a longitudinal slot located under the rear end portion of the saw blade. A suction passage is mounted on the lower side of the machine housing and has a sucking-in opening extending from the front end side of the suction passage to the longitudinal slot of the machine housing located under the rear end portion of the saw blade.

Abstract: The present invention is an improved drill head unit in which the lower portion of the drill chuck has a lobed shaped cross section which fits into a corresponding lobed shaped opening in a shaft connected to a spiral bevel gear mounted for rotation about a vertical axis. The lobed shaped cross section replaces the spline drive previously used in such units, and the spiral bevel gears replace the bevel gears previously used. An improved and simplified radial elastomeric seal is provided to separate a vacuum pressurized cavity in the housing from a lubricating cavity in the housing, and a locking mechanism locks against the drill steel such that the drill steel can be withdrawn from a drilled hole by lowering the drill head unit.

Abstract: A drilling or chiseling tool (1) includes a suction device (2) with a suction head (3), a suction line (4) extending from the suction head to a suction blower wheel (5) and a separating device (6). The suction device (2) is detachably connected with the tool (1). When connecting the suction device (2) to the tool (1), the shaft (9) of the suction blower wheel (5) can be coupled with the drive shaft (8) of a drive motor (7) for the tool.