Abstract: A grinding apparatus for grinding the hard metal inserts or working tips of drill bits (percussive or rotary), tunnel boring machine cutters (TMB) and raised bore machine cutters (RBM), said grinding apparatus having means for holding one or more bits to be ground and a grinding machine carried by an arm or lever system that permits movement of the grinding machine relative to the longitudinal axis of the button of the bit to be ground wherein means are provided to assist with aligning the grinding machine with the longitudinal axis of the button to be ground.

Abstract: A blade-mounting adaptor for a power tool has a blade-mounting stud on which the blade is mounted at a first end. The blade is mounted upon the stud in a manner such that it is capable of axial motion along the length of the stud when exertion is applied to the blade. The blade is provided with an adjustable pre-set bias force against the axial motion.

Abstract: The invention concerns a grinding head for a mobile grinding machine which is suitable for grinding floor surfaces, and a mobile grinding machine comprising such a grinding head. The grinding machine is driven by a motor and has a rotatable planet disc and grinding heads (5–7) rotatable relative to this. The grinding heads (5–7) comprise a carrier (8) which is designed to be rotated by means of the motor, and a grinding disc (9) designed to be driven by the carrier (8) by means of a coupling element (10). The coupling element (10) comprises a multiplicity of plates (11–13) which are stacked on each other, each with a central opening (14) and drain holes (15) distributed around this, and a compression spring (16) which extends through the central opening (14) of the plates (11–13) and by means of screw elements (17) is clamped between the carrier (8) and the grinding disc (9).

Abstract: A semiconductor manufacturing apparatus includes a wafer support having a grinding base on which a wafer is disposed, and a grinding assembly disposed above the grinding base. The grinding assembly includes a grinding plate having grinding projections at the bottom thereof and at least two fixing pins protruding at a the top thereof, and a grinding mount to which the grinding plate to which the grinding plate can be initially coupled and then secured to quickly. The grinding mount has first fixing grooves in a bottom surface thereof and in which the respective fixing pins are inserted and held. A vacuum system and/or mechanical fasteners are used to then secure the grinding plate to the grinding mount.

Abstract: A pair of hydrostatic radial bearing devices 42, 43 is mounted on right and left side surface of a front portion of a wheel slide 34 in order to support rotatably wheel shafts 45, 52 respectively. A thrust bearing device 45 mounted in either one of wheel shafts 45, 52 supports either wheel shaft 45 or 52 in a thrust direction. A shaft coupling mechanism 60 is installed in wheel shafts 45, 52. A taper cylindrical portion 61 is projected from either one of wheel shafts 45, 52 and fitted tightly with a taper inside opening 65 formed in remaining of wheel shafts 45, 52. A vertical end surface 52t, 49t or Fb extending from a base of the taper cylindrical portion 61 is fitted tightly with another vertical end surface 45t, 52t or 45t of the remaining wheel shaft 45 or 52.

Abstract: A grinding disk (13) for manually held, motor-driven grinders (1) has a centrally arranged fastening recess (15) open at the grinding disk upper side with an internal thread arrangement (16), with which the grinding disk (13) can be screwed onto a connecting part (8), which is arranged on the side of the grinder and is driven for the grinding motion during operation, and which connecting part has a thread section (11) with an external thread arrangement (12), which is associated with the internal thread arrangement (16) of the grinding disk (13). The internal thread arrangement (16) is formed by a multiple thread with at least two thread courses, which are arranged angularly offset to one another. The diameter ratio between the diameter of the internal thread arrangement (16) and the outside diameter of the grinding disk (13) is at least approximately 0.25.

Abstract: A jig is structured to guide a grinder along the inner surface of the base or cover of a combustion turbine. The jig includes a base having a bottom surface with a plurality of rollers arranged in substantially the same radius as the portion of the casing being repaired. Side rollers locate the base horizontally during movement. A top platform may restrain the base vertically by supporting a pivot block that bears against the rotor of the turbine. The grinder may be moved vertically or horizontally with respect to the base upon which it is secured.

Abstract: A detachable fixture of a rotary machining tool (3) on the tool spindle (2) of a machine tool and in particular of a grinding wheel flange (4) on the spindle nose (1) of a grinding spindle (2) is provided with two clamping rings. By means of the Cardanic located clamping rings (10, 13), the clamping force F generated by turning a clamping screw (7) is distributed uniformly on the spindle flange (6). The tool fixture according to the invention permits even large and heavy driven tools with high demands on stiffness and repeatability with respect to radial and axial runout and quality of balance to be changed with little time expenditure.

Abstract: A polishing jig of a hydraulic integral system is improved to increase efficiency. A polishing jig 1 for bearing for use in back-up roll of rolling mill including a shaft member 2 on which an inner ring 104 of a bearing 100 for use in back-up roll of rolling mill is fitted; and a pressure-oil chamber 12 operative in association with the feeding of a pressure oil into the shaft member 2 to protrude an outer circumferential part of the shaft member 2 radially outwardly, the polishing jig includes an inner-ring fixing portion 16 for axially fixing individual inner rings 104 of a plurality of the bearings 100 fitted on the shaft member 2 as axially arranged, wherein a plurality of the pressure-oil chambers 12 are formed internally of the shaft member 2 in correspondence to the plural bearings 100 fixed on the shaft member 2.

Abstract: An abrasive drill bit and method of use on glass, ceramics, tile, stone and similar solid materials, both natural and synthetic. A circle is ground into the material using a cylindrical drill bit, which grinds a loose abrasive between the bit cylinder and the material. When the circle is complete, a punch-out piece of the material falls out, leaving a smooth hole. Alternatively, the loose abrasive is ground between a solid bit and the material to grind out a hole. In both methods, the loose abrasive is preferably mixed with water to form a slurry.

Abstract: Arrangement for releasably fastening a grinding wheel or a group of grinding wheels on a wheel spindle, for example, a group of grinding wheels in a spectacle-lens-edging machine. The machine has a grinding-wheel-retaining shaft that is arranged, in an axially displaceable manner, in a coaxial bore of the wheel spindle, a retaining disk that may be fastened in a releasable manner at the free end of the grinding-wheel-retaining shaft, and clamping elements arranged between the wheel spindle and the grinding-wheel-retaining shaft for axially bracing and releasing the grinding wheel or the group of grinding wheels between the wheel spindle and the retaining disk.

Abstract: A machining apparatus comprises a rotating spindle mounted rotatably, a rotating drive source for rotationally driving the rotating spindle, a rotary tool detachably mounted on the rotating spindle, and a screwed member rotated and screwed to the rotating spindle for mounting the rotary tool on the rotating spindle. The machining apparatus is further provided with selective rotation inhibiting means for selectively inhibiting the rotation of the rotating spindle.

Abstract: A power tool having a receptacle for securing a tool to a drive shaft thereof is disclosed. The receptacle comprises a receiving opening, preferably being arranged on the tool. The receiving opening engages a securing section preferably being provided in a raised fashion on the drive shaft of the power tool, thereby effecting a positive fit. The securing section comprises a plurality of rounded tips arranged at even radial distances from said longitudinal axis, at angular intervals between each other, each rounded tip having a pair of lateral flanks extending from a common apex toward an intermediate section connecting lateral flanks of a pair of adjacent rounded tips. Preferably the receiving opening comprises a number of rounded tips which is twice the number of rounded tips provided on the raised section.

Abstract: A polishing jig of a hydraulic integral system is improved to increase efficiency. A polishing jig 1 for bearing for use in back-up roll of rolling mill including a shaft member 2 on which an inner ring 104 of a bearing 100 for use in back-up roll of rolling mill is fitted; and a pressure-oil chamber 12 operative in association with the feeding of a pressure oil into the shaft member 2 to protrude an outer circumferential part of the shaft member 2 radially outwardly, the polishing jig includes an inner-ring fixing portion 16 for axially fixing individual inner rings 104 of a plurality of the bearings 100 fitted on the shaft member 2 as axially arranged, wherein a plurality of the pressure-oil chambers 12 are formed internally of the shaft member 2 in correspondence to the plural bearings 100 fixed on the shaft member 2.

Abstract: The invention is based on a hand power tool that comprises a motor (12)—with a motor shaft 14—located in a housing (10), which said motor shaft is supported via a shaft bearing (18) located on a side closest to a backing pad (16) and that is interconnected in torsion-resistant fashion with an eccentric sleeve (22) in a seat (20). It is proposed that the eccentric sleeve (22) projects in the axial direction (56) at least partially into the shaft bearing (18), and at least part of the axial space of the shaft bearing (18) is used to form a drive connection with the eccentric sleeve (22).

Abstract: A bi-directional rotation pneumatic grinding tool for surface grinding operation consists of an operating section and a handgrip. The operating section includes an actuator to drive a transmission axle to rotate in two directions that has a spline section and a screw hole to couple with a first and a second splined trough of a coupling member and a fastening member, and a fastening element which has screw threads to run through the fastening member and fasten to the screw hole of the transmission axle. The invention may rotate in a positive or inverse direction to meet different requirements without loosening off. The design of spline section and splined troughs makes fabrication and assembly easier without concerning screwing direction. And sparks, grinding debris or dusts generated during grinding operation may be directed in a desired direction without polluting the working environment, hurting people, or damaging the work pieces.

Abstract: The invention is based on a tool receiver for a grinder, in particular for a handheld angle grinder (10), having a carrier device (12, 14, 16, 182, 184, 300), via which an application tool (18, 32, 186, 188) can be actively connected to a drive shaft (54). It is proposed that the application tool (18, 32, 186, 188) be actively connectable to the carrier device (14, 16, 182, 184) via at least one detent element (24, 26, 190, 192, 194, 196, 198, 200, 302) movable against a spring force that snaps into place in an operating position of the application tool (18, 32, 186, 188) and immobilizes the application tool (18, 32, 186, 188) with positive engagement.

Abstract: Abrasive article including a backing plate. Backing plate has a first major surface and a second opposite major surface. A central aperture extends through backing plate. An abrasive layer is secured to the first major surface of backing plate. A fastener is press fit to backing plate so as to define the central aperture.

Abstract: A stabilizing collar for a concrete saw blade provides a rigid blade structure for smoother cutting operations, particularly in partially cured concrete. A pair of the present collars are secured to the blade shaft on each side of the blade, clamping the blade securely therebetween. Each collar has a slightly recessed central area and a raised toroidal rim therearound. Clamping the blade and collar assembly tightly on the shaft, compresses the recessed areas and clamps the rim portions of the collars tightly against the blade at some distance outward from the shaft, thereby providing a rigid assembly and essentially eliminating lateral vibration and flexing of the blade. This enables an otherwise conventional concrete saw to be used for cutting “green” concrete, i.e., relatively soft concrete which has only partially cured, without risk of spalling and breaking up of the edges of the cut due to blade vibration thereagainst.

Abstract: This device for the treatment of surfaces is specifically conceived as an addition to motor-driven hand tools. It includes a device mounting that can be installed securely in position on a housing component of a motorized driving unit in such a way as to be removable at will. The device also includes a tool mounting, which is designed specifically for an instrument that rubs and polishes surfaces. The device further includes a peripheral component, extending from the center, which is connected to the tool mounting in a manner such that the turning of the peripheral component, around a rotation axis, of this peripheral component sets the tool mounting in motion. The tool mounting is mounted in relation to the device mounting, in a manner such that it can be tilted, and a mechanism is envisioned, which will basically prevent the tool mounting from turning about on the rotation axis of the peripheral component, and which will simultaneously allow for the tilting of the tool reception.

Abstract: The invention is based on an insert tool with a rotationally driveable disk-shaped hub and an abrasive disposed in particular in a radially outer region, in particular of the kind used for a cut-off wheel, a grinding disk, a rough grinding disk, a cutting disk, or an abrasive paper.

Abstract: An insert tool with grinding blade and a supporting disk, and with a hub, which has at least one opening that permits the hub to be clamped to a driver flange of a grinder, which flange is connected to a drive shaft, wherein the hub is constituted by a component that is separate from the supporting disk, the hub can be operatively connected to a driver device of the grinder by means of at least one detent element, which is supported so that it can move in opposition to a spring element and which engages in detent fashion in an operating position of the hub and fixes the hub in a positively engaging manner.

Abstract: A device for attaching two units (17,18) provided for rotation in unison about an axis, having axial and radial attachment of the units relative to each other. The attaching involves first engagement members (28,29) engageable with each other and provided on the first and second units, the engagement members being arranged to cause engagement with each other by radial relative moment between the units (17,18).

Abstract: A polishing jig of a hydraulic integral system is improved to increase efficiency. A polishing jig 1 for bearing for use in back-up roll of rolling mill including a shaft member 2 on which an inner ring 104 of a bearing 100 for use in back-up roll of rolling mill is fitted; and a pressure-oil chamber 12 operative in association with the feeding of a pressure oil into the shaft member 2 to protrude an outer circumferential part of the shaft member 2 radially outwardly, the polishing jig includes an inner-ring fixing portion 16 for axially fixing individual inner rings 104 of a plurality of the bearings 100 fitted on the shaft member 2 as axially arranged, wherein a plurality of the pressure-oil chambers 12 are formed internally of the shaft member 2 in correspondence to the plural bearings 100 fixed on the shaft member 2.

Abstract: A power tool having a receptacle for securing a tool to a drive shaft thereof is diclosed. The receptacle comprises a receiving opening, preferably being arranged on the tool. The receiving opening engages a securing section preferably being provided in a raised fashion on the drive shaft of the power tool, thereby effecting a positive fit therebetween. The receiving opening has a cross section comprising a plurality of bulges displaced outwardly from a center axis of the drive shaft.

Abstract: In a depressed-center abrasive wheel assembly a reinforcement layer of polygonal shape is located between a front face of the abrasive wheel and a front flange. The reinforcement layer is dimensioned to entirely cover the depressed center portion of the wheel. An example of polygonal reinforcement layer has a hexagonal shape and is made of fiberglass cloth. A polygonal shape reinforcement layer can also be employed between the front flange and the front face in an abrasive flat wheel assembly that employs a wheel without internal reinforcement.

Abstract: A guide for a machine tool including a housing adapted for mounting onto and traversal along an elongate track, the housing including a carriage for mounting a guide arm for controlled movement relative to the track. The guide arm has a mount for fitting said machine tool and said housing has at least one top track wheel, at least one side track wheel and at least one oblique track wheel adapted for rolling along the top, side and edge of the elongate track, respectively.

Abstract: A grinding machine tool receptacle for a hand-guided angle grinding machine has a slaving device by which an insert tool is operatively connectable to a drive shaft, the insert tool is operatively connectable to the slaving device via at least one detent element supported movably counter to a spring element, which detent element snaps into place in an operating position of the insert tool driven by the spring element and fixes the insert tool by positive engagement, the detent element is displaceable in the axial direction counter to the spring element, and the insert tool is connected to the slaving device in the circumferential direction via at least a first element and in the axial direction via at least a second element, with the second element arranged for fixing of the insert tool with a spring force.

Abstract: An apparatus and a method for transferring a rotational torque from a hub frame to a one-piece hub shaft onto which a pad conditioning disc is attached are described. The apparatus is a one-piece hub shaft for mounting into a hub-frame. To provide a great improvement over the conventional design wherein a hub spacer is mounted to a hub shaft by screw means, the present invention conditioning head is assembled together by frictionally engaging a key and a flat surface on the hub shaft to a slot opening on the hub frame such that any catastrophic failure due to a screw breakage can be avoided. The present invention novel frictional engagement further provides a more uniform torque transfer between the two components.

Abstract: In a depressed-center abrasive wheel assembly a reinforcement layer of polygonal shape is located between a front face of the abrasive wheel and a front flange. The reinforcement layer is dimensioned to entirely cover the depressed center portion of the wheel. An example of polygonal reinforcement layer has a hexagonal shape and is made of fiberglass cloth. A polygonal shape reinforcement layer can also be employed between the front flange and the front face in an abrasive flat wheel assembly that employs a wheel without internal reinforcement.

Abstract: A holder for an abrasive disc allows for a quick manual change of the abrasive disc. The holder including an uncoupling mechanism that in turn includes a handle comprising a pin and an adjacent hub comprising a partial annular channel. The handle and hub have a limited rotational engagement wherein the pin travels in the channel. When an operator desires to replace an abrasive disc, the operator grasps the handle with one hand and rotates the disc, face plate, and hub, together as a unit, with the other hand. This counter-rotation breaks the tight attachment of the disc on the shaft of the finishing tool, so that disc can be easily unthreaded from the shaft.

Abstract: A method and apparatus for deburring nonmetallic machined workpieces. A deburring material of sufficient hardness to debur nonmetallic workpieces without causing scarring thereto is rubbed against a workpiece to effect deburring. The deburring material has a durometer hardness and consequently a coefficient of friction whereby frictional engagement of a burr with the deburring material is stronger than the attachment of the burr to the workpiece and therefore the burr is removed as the deburring material is actuated and brought into contact with the burr. The deburring material can be, e.g., polyisoprene and may be mechanically actuated or actuated by hand.

Abstract: The present invention provides a grinding cup (1) having a lower grinding section (2) and an upper body section (3) integrally connected to form a grinding cup having top (4) and bottom (5) surfaces. The grinding section (2) is formed from a material capable of grinding the hard materials such as tungsten carbide inserts of button bits etc. A centrally disposed convex recess (7) is formed in the bottom surface (5) having the desired profile for the button to be ground. One or more passageways (15) in the upper body section (3) and grinding section permit a coolant, preferably water, optionally mixed with cutting oil or a water/air mist, to be provided to the surface of the button (5) during grinding, through outlet(s) on the bottom surface. Drive means (8) are provided on or in the upper body section that cooperate with the output shaft of the grinding machine.

Abstract: A sanding machine comprises a housing with a drive arranged in the housing. A substantially flat sanding sole having a main plane is mounted on the housing for movement in the main plane. The sanding sole is adapted to drive in an oscillating movement. The sanding sole has a first part on which the drive engages and a second part adjacent to the first part, which is releasably connected to the first part. The second part can be removed and replaced with a third part, the third part being releasably connected to the first part. The third part can be an additional sanding surface or a base for another tool. A sanding element for use in a sanding machine in the form of a sanding sole assembled from a first part and a second part.

Abstract: A method of detachably mounting a rotating tool provided with an attachment portion having a cylindrical inner circumferential surface (or outer circumferential surface) to a mounting portion having a cylindrical outer circumferential surface (or inner circumferential surface) of a spindle. The inner diameter (or outer diameter) at normal temperatures of the attachment portion is made larger (or smaller) than the outer diameter (or inner diameter) at normal temperatures of the mounting portion. The attachment portion is heated (or cooled) and/or the mounting portion is cooled (or heated) to make the inner diameter (or outer diameter) of the attachment portion larger (or smaller) than the outer diameter (or inner diameter) of the mounting portion to fit the mounting portion onto (or into) the attachment portion.

Abstract: A bi-directional grinder for allowing an operator to change the direction of rotation of the wheel, having a housing, a motor capable of bi-directional rotation, and a shaft. The grinding wheel is mounted on the shaft within a shroud and attached to the shaft with a locking mechanism. The shaft has a left threaded bottom portion and a right threaded bore therein. Once the grinding wheel is positioned on the shaft, a nut is tightened onto the threaded bottom portion of the shaft to tighten the wheel against the shoulder. A bolt with a broad head is inserted into the shaft bore so that the broad head is tightened against the nut. A spring loaded pin extends through the housing and is mateable with an off center transverse hole in the circular gear. When aligned, the pin may be inserted into the gear hole to cause the gear and shaft to cease rotation.

Abstract: A method for grinding, polishing, buffing, scaling, and grooving a finish onto and into a workpiece. This method provides the versatility of a hand held type angle grinder to be used while being supported frog, a clamping device. Also provided is a means for supporting a hand held type angle grinder from a clamping device such as a tool post, a tool post tool holder, and a bench vice.

Abstract: Improved accuracy of grinding glass pieces for use in stained glass art and the like. The pattern of the final outer boundary of each piece of glass is traced onto frosted mylar tracing paper to create a mask. The mask is then cut to the traced pattern and is adhered to a piece of untrimmed glass of area greater than that of the mask, using water resistant adhesive. The outline of the pattern is rendered opaque, for example by an ink marker. Thus prepared, the untrimmed glass is abraded on a powered abrading machine having a flat, horizontal work table, a rotatable abrading element disposed to engage a workpiece supported on the work table, and lamps operating at low voltage arranged to back light the workpiece from therebelow. The untrimmed workpiece exhibits a brightly illuminated zone extending outside the opaque zone of the mask, thus emphasizing glass to be eroded. The workpiece is urged against the rotating abrading element until the illuminated zone is eliminated.

Abstract: The invention is based on an insert tool with grinding blade (10, 12) and a supporting disk (14, 16), and with a hub (18, 20), which has at least one opening (22, 24, 26) that permits the hub (18, 20) to be clamped to a driver flange (28) of a grinder (30), which flange is connected to a drive shaft (62).

Abstract: The invention is based on a tool receiver for a grinder, in particular for a handheld angle grinder (10), having a carrier device (12, 14, 16, 182, 184, 300), via which an application tool (18, 32, 186, 188) can be actively connected to a drive shaft (54).

Abstract: The invention is based on a grinding machine tool receptacle, in particular for a hand-guided angle grinding machine (10), having a slaving device (12, 14, 16, 300), by way of which an insert tool (18, 32) can be operatively connected to a drive shaft (54).

Abstract: A method and apparatus for deburring nonmetallic machined workpieces. A deburring material of sufficient frictional engagement and hardness to debur nonmetallic workpieces without causing scarring thereto is rubbed against a workpiece to effect deburring. The deburring material has a durometer hardness and a coefficient of friction whereby frictional engagement of a burr with the deburring material is stronger than the attachment of the burr to the workpiece and therefore the burr is removed as the deburring material is actuated and brought into contact with the burr. The deburring material can be, e.g., polyisoprene and may be mechanically actuated or actuated by hand.

Abstract: A method for grinding, polishing, buffing, scaling, and grooving a finish onto and into a workpiece. This method provides the versatility of a hand held type angle grinder to be used while being supported frog, a clamping device. Also provided is a means for supporting a hand held type angle grinder from a clamping device such as a tool post, a tool post tool holder, and a bench vice.

Abstract: A grinding tool for grinding buttons of a rock drill bit includes a spindle having a longitudinal axis of rotation, and a grinding cup mounted on the spindle by a tongue-and-socket connection. A fastener in the form of a coil spring secures the grinding cup to the spindle. The grinding cup can be inserted into the inside of, or around the exterior of, the coil spring. When the spindle is rotated in a working direction, the spring tightens against the grinding cup. To install or remove the grinding cup, the grinding cup is rotated relative to the spindle in a direction corresponding to the working direction, whereby engagement between the grinding cup and the coil spring becomes loosened.

Abstract: A polishing device includes a wafer chuck mechanism which retains a wafer while its plane to be polished faces upward, a polishing pad component which possesses a polishing plane which polishes the wafer, a polishing head, and a shift mechanism which enables a relative displacement of said polishing pad component in relation to the wafer. A fixation and retention mechanism fixes and retains said polishing pad component to the polishing head in a detachable fashion while its polishing plane faces downward. The displacement distance of the shift mechanism ranges from the polishing position of the wafer to the exchange position of the polishing pad component, so that the polishing pad component is automatically exchanged.

Abstract: An apparatus and a method for transferring a rotational torque from a hub frame to a one-piece hub shaft onto which a pad conditioning disc is attached are described. The apparatus is a one-piece hub shaft for mounting into a hub-frame. To provide a great improvement over the conventional design wherein a hub spacer is mounted to a hub shaft by screw means, the present invention conditioning head is assembled together by frictionally engaging a key and a flat surface on the hub shaft to a slot opening on the hub frame such that any catastrophic failure due to a screw breakage can be avoided. The present invention novel frictional engagement further provides a more uniform torque transfer between the two components.

Abstract: A grinding wheel replacement safety structure for handheld grinding wheel device is located between a transmission grinding wheel fitting end and an actuating push button, and includes a safety button, a stop in, a limit actuating link, a link spring, and a stop in spring. The safety button is located above an umbrella-shaped gear of the fitting end and has a button face projecting from a grinding wheel housing. The stop pin extends vertically across a rear end of the button face proximate to a hub of the gear. The limit actuating link extends transversely across an offset surrounding wall of the safety button proximate to the actuating push button. The link spring is fitted over the limit actuating link and the stop pin spring is fitted over a neck portion of the stop pin to respectively abut against the inner wall of the housing.

Abstract: A brush element U includes an assembly of annular disks 2 joined together as arranged side by side. Each disk has polishing bristles or cleaning yarns 1 implanted in its outer periphery. The brush elements U are arranged side by side around a shaft 3. The brush element U is engageable with the shaft 3 by keyways 5 formed in both a peripheral surface of the shaft 3 and an inner peripheral surface of the brush element U and by sunk keys 4 fitted in the respective keyways 5. The sunk keys 4 have a length not larger than the length of the brush elements U, and each of the sunk keys 4 is expandable or contractable widthwise and tightly engageable in the keyway 5 when being expanded. The sunk key 4 is disengageable therefrom when being contracted. The sunk key 4 is prevented from slipping out of the keyway 5 by a retainer C when being contracted and fitted in the keyway 5. The brush roll and brush elements thereof are useful for grinding, polishing cleaning or otherwise treating steel sheets, plates, or strips.

Abstract: The invention relates to a clamping device for grinding discs (3, 4) having clamping elements which are formed by a clamping flange (1) and a clamping nut (2). A rigid, preferably metallic intermediate ring (5) is arranged between a clamping element and the grinding disc (3, 4). The intermediate ring distances the grinding disc (3, 4) from the clamping element. The intermediate ring (5) or the clamping element adjacent to the intermediate ring (5) is provided with a fixed damping layer (9, 12, 14, 20) made of an elastic material. The damping layer extends in both a radial and an axial direction.

Abstract: The invention is based on a tool receptacle, in particular for a hand-held angle grinding machine (10) or a circular power saw, having a slaving device (12, 14, 300), by way of which an insert tool (16) can be operatively connected to a drive shaft (18), and having a locking device (20), by way of which, with an actuation button (22), the drive shaft (18) can be locked upon mounting and/or removal of the insert tool (16).