Abstract: A dust suction hood includes a tapered outer cover, a cylindrical outer cover, a tapered inner baffle plate disposed in the tapered outer cover, and a first blocking member matched with an opening in the other end of the cylindrical outer cover. A top opening of the tapered outer cover is matched with an opening in one end of the cylindrical outer cover. A side wall opening of the cylindrical outer cover serves as a dust outlet. A first gap is formed in the tapered outer cover. A first dust suction port is formed between bottom openings of the tapered inner baffle plate and the tapered outer cover. A first drill pipe connecting port is formed in the first blocking member. A drill pipe of the mine drill passes through the first drill pipe connecting port to penetrate the dust suction hood on the drill pipe.

Abstract: A device for the sampling and extraction of a granular solid in a pack of granular solids, containing a sampling probe (1), a sample collector (2) connected to said sampling probe (1), and a controller (3), the sampling probe (1) comprising a sampling tube (4) and at least one transfer tube (5), the sampling tube (4) and transfer tube (5) containing at least one central conduit and at least two lateral conduits, wherein the central conduit (6a) of the sampling tube (4) contains a collection chamber (10) containing a system (11) for retaining the granular solid, and the lateral conduits (7a, 7b) of the sampling tube (4) and transfer tube (5) are connected to a source of gaseous fluid (12) which is capable of extracting the granular solid retained in the collection chamber (10) via the lateral conduits (8a, 8b) of the sampling tube (4) and transfer tube (5).

Abstract: A device for mitigating debris travel including a debris barrier, a support-frame, and a ceiling-attachment. The debris barrier includes a ceiling-opening-interface, a closeable-user-opening, an inside-surface, and an outside surface. The support-frame is fixed to the ceiling-opening-interface of the debris barrier. The support-frame is configured to hold open the ceiling-opening-interface, and further configured to hangingly support the debris barrier. The ceiling-attachment is fixed to the support-frame. The ceiling-attachment is configured to couple with a drop-ceiling, and the support-frame is shaped to seal against the support-frame.

Abstract: A method of cutting a microtrech in which the buried utility is exposed by opening an access hole in a roadway above the buried utility using a roadway access hole drill that rotates and vibrates the drill bit. A roadway access hole drill having a down-the-hole jack-hammer drill bit and a motor to rotate the down-the-hole jack-hammer drill.

Abstract: A device for effectively controlling and collecting debris created when cutting or trimming a material. This device includes a hollow generally prismatic and rigid transparent body, an evacuation penetration in the body for the removal of debris, an interface opening in the body where the device is intended to contact a cutting substrate, a tool access penetration in the body where the blade of a cutting tool, such as a jab saw, can be inserted through the body and into the cutting substrate as well as edge protection around the tool access penetration to prevent damage to the device body if contact with the cutting tool is made when in operation. Debris created during the operation of the cutting tool is contained within the device body and evacuated via vacuum through the evacuation penetration.

Abstract: A support includes a support element for supporting a drilling tool used in rock drilling. The support element is inside a suction housing of a rock drilling unit at least during drilling. The support is located at a front end portion of a feed beam and is used to support the tool especially during the collaring phase of the drilling. A method of collaring is disclosed wherein the drilling tool is supported by the support.

Abstract: The invention provides a roof bolt installation tool which has a central drill bit. A plate surrounds the central drill bit and has radial drill bits attached to it so that when the central drill bit rotates, the plate rotates. A boot surrounds the plate and is rotationally isolated from the plate and central drill bit. When the drill bit cuts a central bore into a mine roof, the radial drill bits cut a recess having a horizontal surface. A roof bolt and support plate are installed such that the bolt is inserted in the central bore and the support plate abuts the horizontal surface.

Abstract: A dust-collecting device adaptive to a power drill comprises a container having atop a tapered portion, the tapered portion including an opening, the container having a through hole at bottom, and a positioning seat being raised around the through hole; a shaft assembly passing through the through hole, the shaft assembly having at least one bearing received in the positioning seat; a spring member being mounted around the shaft assembly; and a spacing member being coupled to one end of the spring member, the spacing member having a round hole for a bit of the power drill to pass therethrough and then pass through the shaft assembly and the opening, whereby, when the power drill drills, drill dust thus generated is guided by a taper of the tapered portion and converged in the container.

Abstract: A dust collector is disclosed for use with a drill bit or a depth stop that is coupled to a drill bit. The dust collector includes a rear attachment portion configured to be axially fixed to a drill bit or to a drill bit depth stop that is axially fixed to a drill bit. An intermediate non-collapsible portion is attached to a front end of the rear attachment portion. The intermediate non-collapsible portion defines a dust-collecting pocket and is structured to inhibit collapse as the drill bit is inserted into a workpiece. A front collapsible portion is attached to a front end of the intermediate non-collapsible portion and at least partially collapses as the drill bit is inserted into a workpiece.

Abstract: The invention relates to a shield structure of a rock drilling apparatus for dampening noise, the rock drilling apparatus comprising a feed beam whose one end is a drilling end, whereby the drilling end of the feed beam comprises a first shield part mounted immovably relative to the feed beam, and a second shield part mounted movably relative to the feed beam. A tubular shield flexible at least in its longitudinal direction is mounted between the shield parts, the shield being tightly attached by its ends to the first and the second shield part.

Abstract: A system and method for soil saturation and digging is disclosed. First, a system for soil saturation and digging is disclosed. Said system comprises a digging tool having a first end and a second end, a pipe having a first end and a second end, a hose socket, a nozzle, a trigger, and a shield. Said pipe having an axial body capable of transporting a fluid between said first end and said second end of said pipe. Said hose socket capable of receiving a hose comprising said fluid. Said nozzle capable penetrating a surface and a subsurface and of spraying said fluid into said subsurface. Said trigger is capable of controlling a flow of said fluid. Said shield capable of redirecting a diverted fluid displaced by said digging tool. Wherein, said nozzle attaches to said first end of said digging tool, said hose socket attaches to said second end of said digging tool, and said shield attached around said pipe. Next, a method for soil saturation and digging is disclosed.

Abstract: An earth drilling device includes an auger, an encasing tube that surrounds the auger, a rotary drive for driving at least the auger in a rotating manner about a drilling axis, and an ejecting device for discharging drill spoil from the auger. The ejecting device has a discharge duct for the drill spoil, and a mast element along which the auger can be moved together with the ejecting device. A device for changing the length of the discharge duct is provided.

Abstract: The invention relates to a water collecting device (30) intended for a core drilling unit (1) that comprises a drilling machine including an electric drilling motor (6), a machine housing (3) with an output shaft (9), that can be composed of many sections, a core drill (4) connected to the machine shaft and means to supply cooling water, as required, to the cylindrical inner part of the of the core drill via the machine shaft (9). The water collecting device (30) comprises a vessel (31) with a bottom (32) and a side wall (33), the bottom (32) positioned below the core drill (4), the vessel (31) arranged to collect spent water as well as drill cuttings from the core drill (4), the vessel (31) further comprising at least a draining duct (58) for drainage of spent water as well as drill cuttings from the vessel (31). The invention also relates to the core drilling unit equipped with the water collecting device.

Abstract: A reinforced stripper rubber assembly with a stripper rubber body including a drillstring engaging portion having a drillstring bore extending axially therethrough. The drillstring engaging portion of the stripper rubber body is made from an elastomeric material, has an inner surface that engages a drillstring when the drillstring is dispose therein and has a reinforcing insert receiving recess within an exterior surface thereof extending at least partially around the drillstring bore. A reinforcing insert is disposed within the reinforcing insert receiving recess. The reinforcing insert includes an elastomeric material bonded to the stripper rubber body within the reinforcing insert receiving recess. A support structure is disposed within a support structure engaging portion of the stripper rubber body. The support structure includes a central opening generally aligned with the drillstring bore thereby allowing the drillstring to pass jointly through the central opening and the drillstring bore.

Abstract: A mobile soil sampling device is mounted on the side of a vehicle such as an ATV or UTV and includes an upstanding frame member which is vertically movable with respect to the vehicle by means of a parallel arm linkage and actuator. A vertically disposed and rotatable auger is mounted on the frame member and is moved upwardly and downwardly with respect thereto through the use of a motor and pinion gear with the pinion gear engaging a gear rack on the frame member. The auger is rotated so as to dig into the ground to the desired depth with the soil sample being conveyed upwardly into a vacuum collection chamber with the soil sample being conveyed to a vacuum chamber mounted on the vehicle. A sample collection device is mounted beneath the vacuum chamber for receiving the desired soil samples.

Abstract: A drill head for drilling machines having a protective screen for conveying the drilling slurry discharged from the drivers drill rods and related sleeves. A screen constructed according to the principles of the present invention reduces the slurry fallout area in the vicinity of the drilling zone. The screen panel has a generically U-shaped cross section, or in any case such a cross section as to cover wholly or partly at least three sides around the area where the slurry is discharged from the drivers of the drill rod (A) and related sleeve. In one embodiment, the screen panel is coupled to the structure of the drill head by connection supports and translation devices, so to translate the screen panel parallel to the rod and the sleeve.

Abstract: A water treatment pad for core drill, attached on a drilling surface in performing drilling work while supplying cutting water with a core drill, wherein the water treatment pad for core drill comprises: a roughly cylindrical pad main body 10 mounted to surround the core drill and having a drain outlet on a side surface; an inner wall plate 20a detachably attached on the inside of the pad main body and formed into an arc shape in cross section when attached and wherein a pressure space communicating with the drain outlet is formed between the inner wall plate and an inner surface of the pad main body. As an attachment structure of the inner wall plate 20a, preferably, the guide 12 formed with a fitting groove 13 in the top rear face of the pad main body 10 is provided on a circumference thereof so that the inner wall plate 20a is fitted.

Abstract: A rotary deck bushing having an outer body held in a fixed orientation within a drill deck and an inner bushing portion that is configured for rotatable positioning within the outer body portion. A floating center bushing is removable positioned within the inner bushing and can be replaced as wear occurs. A dust deflector made up of a dust canister and a live rubber face with an opening is connected to the inner bushing portion so as to rotate with the inner bushing and to seal out the bushing portion from dust and grit and thus decrease the amount of wear upon the bearings of the device.

Abstract: A surge device providing a vent for bleeding pressure off an air drilled well and providing connectors for surge lines in the blooie line. The surge device has a hollow, abrasion resistant, tapered chamber into which two surge lines and the blow down line enter the surge device. The device is provided with a flange at each end of the chamber for attaching the device into a blooie line with the narrow end of the tapered chamber attached to the downstream end of the blooie line and an enlarged end of the tapered chamber attached to the upsteam end of the blooie line. An abrasion resistant shield pipe penetrating the enlarged end of the tapered chamber and extending into the tapered chamber a sufficient distance to serve as a shield for the terminal ends of the surge lines and the blow down line.

Abstract: A debris collecting apparatus for use with ceiling cutting equipment for collecting debris resulting from the cutting of an opening in a ceiling. The debris collecting apparatus comprises a collection basket having an open upper end and a seal thereat for engaging the ceiling. A cutting blade extends through the basket and is oriented toward the open upper end. A position adjusting mechanism allows relative vertical position of the cutting blade and cutting basket to vary such that the collection basket to remain positioned against the ceiling as the cutting blade penetrates through the ceiling to ensure the collection of all debris, and allows the collection basket to remain stationary as the cutting blade rotates axially therethrough.

Abstract: There is provided a fluid circulating apparatus for a drill that requires only a small amount of coolant, as a suspension is collected and reused. The apparatus (1) for use with a drill (2) includes a suspension collecting device (3) that collects a suspension derived from the coolant mixed with chippings (S) through cutting and drilling operations, a suspension filtering device that filters off the chippings included in the suspension, thereby making the resultant coolant to be stored in a reservoir (4a), and a coolant supplying means that supplies the coolant obtained by the suspension filtering device and stored in the reservoir to the bit. The suspension collecting device includes a vacuum pump used to collect the suspension from a water-receiving pad so provided as to surround a point to be drilled by changing a pressure in the reservoir to subatmospheric pressure.

Abstract: In a device for sealing a bore hole and discharging drill cuttings and stripped excavation material, including a housing adapted to receive sealing elements and an opening capable of being connected to the bore hole, one side wall of the housing is provided with at least one opening for the connection of a haulage duct, wherein the housing end side facing the bore hole is equipped with a lockable, particularly screwable, sealing flange (13) for the detachable connection with a bore hole lining (11). The sealing flange (13) is rotationally and sealingly mounted within the housing and carries projections, in particular an annular brim (15) which is overlapped by a stop (14) of the housing.

Abstract: A drill for forming undercuts in cylindrical bores formed in stone or concrete and including a drilling member (2;22) having a stem (3;23) provided, at its opposite longitudinal ends, respectively, with a shank (4;24) receivable in a chuck of a hand-held drilling tool and a cutting head (5;25) with abrasive cutting bodies, and a sleeve (7;27) for receiving the drilling member (2;22) and having, at its end adjacent to the shank (4;24), a radial collar (8;28), a drag bearing (11) arranged in side the sleeve for supporting the drilling member (2;22), and at least one opening (15;35, 36, 37) formed in a front, in a direction toward the cutting head (5;25), section of the sleeve and spaced axially from the drag bearing (11) by a distance (a) amounting to from about 0.05×D to about 0.6×D, where D is an outer diameter of the sleeve in the drag bearing region of the sleeve.

Abstract: A water pressure operated post-hole digging tool. The tool includes a vertically elongate pipe with an enlarged mandrel member having a generally circular cross section mounted on its lower end, and an attachment for connecting the upper end of the conduit to a source of water pressure. The water pressure is discharged through an open end at the bottom of the mandrel member, so that soil is dislodged at the bottom of the post-hole bore. The flow of water then passes upwardly through the annular cavity around the sides of the mandrel member so as to scour out of the sides of the bore. The lower end of the mandrel member is tapered so as to accelerate the flow of water as this passes into the annular cavity around the body, and upper taper slows the flow as it exits the cavity and flows up the excavated bore. The mandrel member may be formed of solid plastic material.

Abstract: A device, for collecting drilled material and dust produced by a drilling tool, has a flange part (1) with a central axis to be secured to a housing of the drilling tool, and an axially extending container (2) for receiving the drilled material and dust and connected to and extending axially outwardly from the flange part (1) and being compressible in its axial direction towards the flange part. A ring-shaped sealing element (3) is arranged to contact a rotating part of the drilling tool. A radially outwardly extending annular rib on the sealing element is rotatably supported in an annular recess (26) in the flange part (1) and the recess is open towards the axis of the flange part so that no harmful wear can arise in spite of adequate sealing between the sealing element and the rotating part of the drilling tool.

Abstract: A drilling apparatus, having a drilling tower, tiltable for angle drilling, on a drilling platform with an aperture for a drill string, includes a dust seal holder that extends into the aperture in the platform, the dust seal holder being connected to the tower, so as to move up and down in the aperture in an arcuate path along with the drilling tower, as the tower is tilted for angle drilling, the dust seal holder being disconnected from the tower, so as to be not movable, as the tower is moved between a horizontal and vertical position.

Abstract: The present invention relates to a method for use in connection with a drilling apparatus for drilling a hole and also filling the drilled hole with a filler. A hole is drilled by using a tubular drill rod with a crushing tool provided at the end of the drill rod, with the crushing tool substantially defining the diameter of the hole to be drilled. A first flushing medium is supplied in the course of drilling, through the hole in the tubular drill rod to at least one opening in the crushing tool and into an annular space defined between the walls of the drilled hole and the outer surface of the drill rod, for carrying crushed material out of the drilled hole. After completion of the drilling operation and removal of the crushed material, a filler is delivered into the hole in the tubular drill rod, into the drilled hole and/or into the ground or bedrock surrounding the hole.

Abstract: A drill hole filling method involves drilling of a hole by using a tubular drill rod through which, in the course of drilling, a flushing medium is supplied through at least one opening in a crushing tool into an annular space, defined by the hole and the outer surface of the drill rod, for removing crushed material from the hole. The tubular drill rod is used for delivering a filler into a hole and/or into the ground or bedrock surrounding a hole, at the end of the drilling operation. An apparatus for filling a drill hole includes a drilling machine provided with a passaged neck member for fastening a tubular drill rod thereto. Aligned with the neck member is a supply housing which includes at least one chamber adapted to communicate along at least one connecting duct included in the neck member with a passage in the neck member. The supply housing is provided with a valve which is adapted to carry into said chamber a medium required both in the actual drilling and in filling the drill hole.

Abstract: A fluidtight housing such as a banjo box receives and redirects the debris-laden upward flow of fluids from a reservoir. The housing connecting the wellhead of the reservoir with a flowline positioned at an angle other than the vertical receives fluid and debris from the wellhead and redirects them into the flowline. A replaceable and repositionable insert having at least one high wear zone is mounted within the housing so that the flow of fluid and debris impinges against a wear zone on the interior of the insert. Fresh wear zones can be exposed at the point of impact of the fluid stream without the need to remove the housing or insert from its position between the wellhead and the flowline, preferably by rotating the insert within the housing.

Abstract: A screen placement apparatus and system wherein the apparatus includes a motor for providing rotational torque to an auger received within a ground screen and a disposable cutting tip having a cutting diameter equal to or greater than the outer diameter of the screen is connected to the end of the auger. The screen is placed into the ground by simultaneously drilling the hole with the disposable cutting tip, drawing the drill cuttings up through the screen with the auger, and inserting the screen into the hole. The drill cuttings, drawn up through the hole, are discharged through discharge openings. After the desired depth is reached, the auger and motor are longitudinally moved with respect to the screen and cutting tip thereby permanently disconnecting the disposable cutting tip and leaving it within the ground. The auger is, thereafter, retracted from within the ground screen.

Abstract: In a percussive tool in which a very high pressure and preferably cavitating water jet is directed through an opening in the working surface of the tool, the jet is formed by a nozzle positioned in a cavity behind the opening and decoupled from the tool by a bearing layer of water from the jet. A supply pipe extends rearwardly of the nozzle without contacting the tool, and is supported externally of the tool, on a machine which operates the tool, by a support which allows the fluid bearing to center the nozzle within the cavity while restraining movement of the nozzle axially of the tool.

Abstract: A cased water well comprising a generally tubular water well casing extending from subgrade to above grade. A flexible pad is attached to the water well casing for preventing aquifier contamination. The pad has an upwardly extending, generally tubular, flexible and water impermeable neck which is circumferentially continuous. The neck has an axially disposed opening which is adapted to be removably received over the upper terminus of the well casing and the neck is compressibly and sealingly attached to the outer surface of the well casing. A water impermeable flexible skirt is sealingly attached to the neck and extends radially outwardly a substantial distance in all directions from the neck. The flexible skirt has a lower surface which is adapted to be in contact with the earth and an upper surface which slopes continuously downwardly and outwardly from the neck to the outermost edges of the skirt.

Abstract: A chip sampler including a sampler barrel aligned with the stern of a drill pipe to form an extended annular space to receive cuttings from a drilled hole. The sampler barrel carries a reject port in communication with the entire annular space and an access port disposed below the reject port. The access port receives a sample extractor that includes a downwardly directed nose opening which extends into a predetermined proportion of the extended annular space. A reasonably sized representative sample of the cuttings travelling up the extended annular space enter the nose opening and are received into a detachable sample container.

Abstract: An improved rotary expansion tool for reaming frustoconical undercuts in the walls of cylindrical holes is disclosed. The tool is comprised of an elongated sheath with a ram disposed in sliding engagement therein. The ram is provided with an enlarged head which is biased away from the open end of the sheath into which the ram is placed. A load bearing collar is disposed around the sheath intermediate the ends for governing the depth of insertion of the tool into a hole being undercut, and the longitudinal placement of the collar along the sheath can be varied in order to select the depth to which the tool is inserted into the hole. A stop ring is circumferentially disposed around the open end of the sheath to provide a stop for limiting the longitudinal progression of the ram into the sheath, and the longitudinal placement of the stop ring can be varied in order to selectively vary the distance the ram can be pushed into the sheath against the bias of the spring.

Abstract: An improved expansible rotary power tool for reaming frustoconical undercuts in cylindrical holes contained in dense concrete, such as flint and chert aggregates, comprises a tool having a hollow elongated sheath provided with a pair of opposing longitudinal slots adjacent to the cutting end of the tool. An upwardly biased tubular ram is reciprocally disposed within the sheath and is provided with a clevis at its cutting end which extends into the longitudinal slots, and a power engaging head at the end of the tool which projects out of hole being undercut. A load bearing collar mounted adjacent the power engaging end of the tool provides a stop against which the tool rests to determine the degree of advancement of the tool into the hole.

Abstract: An apparatus for bolting the roof of an underground mine is disclosed comprising a mobile frame, a boom extending from the frame and a housing provided at the end of the frame. The housing supports an upwardly extending stinger, a drilling mechanism including a drill centralizer having a central bore therethrough and a passageway in communication with the central bore, a device for delivering a container of roof bolting anchoring media through the passageway and through the drill centralizer and into a drilled hole, a device for indexing a roof bolt into alignment with the drilled hole and a spinner for driving the roof bolt into the drilled hole. The present invention also provides a method for bolting the roof of an underground mine comprising the steps of stinging a housing against the roof of the mine, moving a drill centralizer into communication with the roof and drilling a hole in the roof.

Abstract: A dual bushing centralizer is provided for a rock drill. The one bushing is provided for stabilizing the rock bit and a second bushing is provided which stabilizes the drill rod. An elastomeric stinger encapsulates both bushings and also provides a noise reduction seal around the drilled hole.

Abstract: A tool for drilling a cylindrical hole with an enlarged end undercut portion comprises a shank with cutting edges and a drill collet screwed to the shank by a knuckle thread. The collet is provided with a stop collar having a semispherically-shaped face supported in a matingly configurated recess provided in a stop plate so as to form a swivel bearing. A portion of the collet is closed by a bell connected to the stop plate and formed with a central hole to receive the shank of the tool.

Abstract: A dust seal for a tool device, including a bit receiving end, which comprises typically, an elastomeric material such as neoprene and includes a bit clamping or first end portion having a first axially extending opening of predetermined dimension and having a shape and contour which complements and cooperates with the aligned surface of the tool bit. The predetermined dimension is selected so as to create a first interference fit with the tool bit. The seal includes a tool connection or second end portion axially disposed from the first and connected thereto. The latter includes a second axially extending opening, again of predetermined dimension which has a shape and contour which complements and cooperates with the aligned surface of the bit receiving end.

Abstract: An article of apparel for shielding portions of the body from flying debris such as saw splinters, drill chips, dust, grit, and other particulate matter resulting from overhead work with a hand-held tool, includes a sleeve with an arm-fitting cuff for containing one hand of a user, a porous sleeve-section connecting with the cuff, a transparent sleeve section connected above the porous sleeve section and a loop with a downward angled handle for grasping by the other hand of a user and supporting the upper end of the sleeve against an overhead; pumping action of sawing or the like is prevented by breathing action of the porous sleeve section from blowing debris out of the sleeve, and the transparent sleeve section affords good visibility combined with shielding for the user.

Abstract: A suction attachment for use with a drilling tool includes a muzzle part forming an opening through which a drill bit extends into contact with the material to be drilled. The muzzle part has a suction aperture communicating with the drill bit opening and a suction tube connected to the suction aperture. The suction tube includes a venturi tube section having a transverse plane of smallest cross-section spaced from the suction aperture. Extending from the transverse plane is a connecting passage which terminates at its other end in a suction recess formed in the surface of the muzzle part which faces the material to be drilled. The partial vacuum generated at the venturi tube section is transmitted through the connecting passage to the suction recess for holding the attachment on the material to be drilled.

Abstract: A feed beam for a rock drill has a drill steel centralizer at its front end. The centralizer comprises a thick, cylindrical rubber sleeve which has a clearance to the drill steel. An annular piston is arranged to axially compress the rubber sleeve axially so that it is radially deformed into contact with the drill steel to centralize the drill steel. The centralizer is built together with a dust collecting hood.

Abstract: A rock drill comprises a shaft having a leading and a trailing end, a shank connected to the trailing end, and a drill head connected to the leading end of the shaft. Means for transporting drilling from the leading end toward the trailing end of the shaft are provided which include at least one channel extending parallel to the shaft from the drill head toward the shank. A shell coaxially surrounds the shaft and bounds the channel, which shell has an open front end adjacent the drill head, a closed rear end facing the shank and at least one transverse bore adjacent the rear end of the shaft and open at the outer surface of the shell.

Abstract: An apparatus with a motor driven material removing tool for cutting, drilling, milling, sawing or grinding of concrete, stone or the like. The apparatus comprises three spaced apart operational groups, namely a working group, a vacuum source and control group, and a driving group. The groups are mobile and interconnectable and disconnectable by hoses and electrical cables. The working group comprises an interchangeable tool, such as a drill, drive motor means for driving and advancing the tool, and a tool holding device mounted on the outside of a rigid suction bell. The vacuum and control group includes vacuum producing means and electrical and fluid control units. The driving group has at least one hydraulic pressure pump with motor means for generating the hydraulic power for driving and advancing the tool.

Abstract: A dust cap particularly for use with an overhead rotary hammer. The dust collector is a cup-like member with a bellows side wall, integrally formed in one piece. It has a thickened neck to fit on the tool shank below the chuck, thereby encompassing the chuck and the lower end of the anchor. Dust is efficiently caught in that the bulk of the dust passes through the anchor and chuck, and then directly into the dust collector cup, plus most of the dust outside the anchor is also caught as it falls around the anchor. The bellows side wall facilitates changing tools and removing anchor ends.