Abstract: A grinder 1 includes a spindle 9 having a small-diameter section 11 and a medium-diameter section 12 and a motor shaft 5 on which a pinion gear 6 is provided. The grinder 1 further includes a bevel gear 18 which is provided on the small-diameter section 11 of the spindle 9 and engages the pinion gear 6, and a lock sleeve 17 provided below the bevel gear 18 on the medium-diameter section 12. A coupling groove 21 is provided in the lower surface of the bevel gear 18 opposing the upper surface of the lock sleeve 17. The coupling groove 21 has an external diameter coaxial with and equal to the inner diameter of the lock sleeve 17 and further has an inner diameter coaxial with and equal to the external diameter of the medium-diameter section 12. An inner coil spring 22 is fitted around the second peripheral surface such that half the length of the coil spring covers the inner peripheral surface of the coupling groove 21, whereas the other half covers the outer peripheral surface of the medium-diameter section 12.

Abstract: A rotary power tool having a housing (10) with a tubular extension (12), a rotation motor located in the housing, and an output shaft (13), wherein the output shaft (13) comprises a first section (23), a second section (26) and a connection device (30) forming a drive connection between the shaft sections without any radial play but with a flexibility to angle deviations between the shaft sections (23, 26), the connection device (30) including a sleeve element (31) with a conical socket portion (32) for mounting on a conical surface (33) on the first shaft section (23), a recess (34) of rectangular cross section for torque transfer to a matching rectangular projection (35) on the second shaft section (26), and a ball bearing (43) mounted between a cylindrical socket portion (42) on the sleeve element (31) and a cylindrical end portion (36) of the second shaft section (26) for providing an accurate radial guidance and support of the rear end portion (36) of the second shaft section (26) relative to the sleeve

Abstract: A backup pad for engaging and supporting abrasive sheets, the backup pad being mounted securely to a drive shaft to prevent relative rotation thereto, and to allow easy mounting and dismounting of the backup pad to the mounting shaft without the use of tools. The backup pad includes a body comprising a front surface and a back surface, releasable engagement means provided on the front surface for releasably engaging an abrasive article, and a mounting boss provided on said rear surface. The mounting boss includes a first end facing away from the body, and an opening in the first end of the boss, the opening being formed by an inner surface generally perpendicular to said body and defining a non-circular cross-section. The opening includes elastic means such as an o-ring for releasably engaging a drive shaft mounted in said opening. Also disclosed is a method of using such a backup pad.

Abstract: A method is provided for processing a metal foil sheet to produce magnetic recording media. The method comprises providing an elongate metal foil sheet having a first side and a second side. The sheet is advanced through a plurality of processing stations in equal unit length segments such that each segment receives the same treatment to form a magnetic recording medium from each segment. Method are also provided to prepare the foil surfaces by polishing, texturing, cleaning, and stress relieving, to coat the prepared surfaces with at least one metal layer, to finish the coated layers by buffing, burnishing, and lubricating, and to form disk units from the prepared, coated and finished surfaces.

Abstract: A retarding device of a grinding machine comprises a casing and a grinding element, wherein the casing is securely installed with a circular flat plate around the periphery of the output shaft installed thereon. A fixing seat is installed on the rear side of the grinding element, and a fixing seat is installed with a plurality of friction elements so that the grinding element is combined with the output shaft, and thus the friction element contacts with the flat plate. Therefore, as the grinding element is rotating, the rotary speed of the grinding element is retarded by the friction forces between the friction elements and the flat plate.

Abstract: A method and apparatus for finishing a workpiece surface using MR fluid is provided wherein the workpiece is positioned near a carrier surface such that a converging gap is defined between a portion of the workpiece surface and the carrier surface; a magnetic field is applied substantially at said gap; a flow of stiffened MR fluid is introduced into said converging gap such that a work zone is created in the MR fluid to form a sub-aperture transient finishing tool for engaging and causing material removal at the portion of the workpiece surface; and the workpiece or the work zone is moved relative to the other to expose different portions of the workpiece surface to the work zone for predetermined time periods to selectively finish said portions of said workpiece surface to predetermined degrees.

Abstract: A back-up pad for pad for supporting an abrasive article. A preferred embodiment of the invention provides a back-up pad having a dust collection groove, in which the engagement component for securing the abrasive article is attached to the dust collection groove surface.

Abstract: In a hand-held electrical grinder with a tool holder (22) driven by a rotating eccentric plug (20) which, for receiving a grinding tool has a quick-action locking device (24) with locking elements (40, 41) fixed on the tool and tool holder sides and corresponding with each other, the locking elements (40) on the tool side are formed, on the one hand, by hooks (42) disposed on a circular line and, on the other hand, the locking elements (41) on the holder side are realized by means of a spring wire (43), which is bent in the shape of a ring, in order to transmit a greater output from the tool holder (22) to the (10). The spring wire (43) has a number of radially inward directed indentations (431) corresponding to the number of the hooks (42) on the tool side, which extend behind the hooks (42) on the tool side for locking the grinding tool (10) in.

Abstract: An improved process for lapping a surface according to the present invention comprises:a) providing a work piece with two surfaces to be lapped,b) providing two rotatable platens, each having i) a back surface and ii) a front surface,c) providing a sheet of abrasive material having an abrasive face and a back side, the back side being on the front surface of each of the two rotatable platens with the abrasive faces of each sheet facing the other sheet,d) placing the work piece with two surfaces to be lapped between the two rotatable platens, so that each abrasive face faces only one of the two surfaces to be lapped,e) rotating the two platens at a rotational speed of at least 500 revolutions per minute,f) contacting each of the abrasive faces with the only one of the two surfaces to be lapped, andg) lapping said two surfaces of said work piece simultaneously.

Abstract: The invention is directed to an extended wear stone polishing disk for use with an automatic polishing head. The disk consists of a first plastic plate of prescribed flexibility having a pair of mounting studs secures therewith to extend above its upper face. The mounting studs form a quick release securing members which locks with the mounting plate and secures it with the first plate. A second plastic plate and a resilient foam pad secured there between. A plurality of diamond faced grinding and polishing segments are secured with the lower face of the second plate in a prescribed pattern to form a polishing face. In use, the resilient foam pad evenly distributes resistance to pressure applied against the second plate during polishing while allowing the polishing face to distort in conformance with the contour of the surface being polished.

Abstract: A portable power grinder for operating a wheel type of grinding tool, comprising an output spindle (12) drivingly connected to a rotation motor (11) and provided with a threaded coaxial bore (23) for receiving a grinding tool clamping screw (24) and with a radial support flange (25) for backing the grinding tool when clamped to the output spindle (12). An easily exchangeable tool support element (28) is sandwiched between the grinding tool and the support flange (25) and is provided with a coaxial through opening (30) for the clamping screw (24) and a forwardly directed tubular neck portion (27) for centering cooperation with a corresponding opening in the grinding tool.

Abstract: An abrading tool adaptable to function as a needle scaler or chisel type device. Said abrading tool acts upon a surface to be treated in a efficient and environmentally safe manner, by removal of a work surface coating or fouling film, lead paint, rust, weld spatters, or the like, with low loss and collection of removed material dust and debris for safe filtering and disposal thereof so that operations such as boat hull and auto body cleaning or paint removal, for example, may be carried out without an inordinate hazard of contaminating the ambient work area environment.

Abstract: An auto body buffing and grinding machine has a fixed handle with a trigger mechanism, a surface with threaded opening for attachment of an adjustable handle, and an adjustable handle that is quickly and easily attached, adjusted, or detached. The adjustable handle has two angularly adjustable mechanisms working in mutually perpendicular planes, each being secured by a hand operable nut. One attachment mechanism works by insertion from the outside of the threaded opening and then the tightening of its associated nut against the surface surrounding the opening. The other attachment mechanism works by securing parallel plates with roughened surfaces together, and includes a spring normally urging the roughened surfaces of the plates apart. The plates are rotatable by more than ninety degrees.

Abstract: An angle grinder with a reversible drive mechanism includes a hollow arbour with a bottom flange and a polygonal coupling piece which is keyed into a corresponding polygonal recess in the bottom of the arbour. A retaining bolt extends through the arbour and is threaded into the coupling piece. The coupling piece both couples the arbour and the retaining bolt for simultaneous rotation and retains the disk tool against the flange of the arbour. The retaining bolt is accessible by means of a slide which engages crenelations in the rim of the arbour to lock the arbour against rotation when accessing the retaining bolt.

Abstract: A hand power tool formed as a hand-guided angular grinder has a tool, and an electric-motor drive for the tool, a housing accommodating the drive and carrying a central bearing pin, a handle composed of two semi-shells, rotatably arranged on the bearing pin, overlapping an end side of the motor housing and having a switch strip, an electrical switch actuated by the switch strip and connected with the drive, and a fixing device for fixing the handle in at least two different positions in a relative rotation to the motor housing and having a manual actuating member arranged on the handle, each of the handle shells being provided with a bearing semi-shell formed on the handle shell and rotatably arranged on the bearing pin, the bearing pin being provided at an end side with a blind hole, and a sleeve is inserted in the blind hole, provided with a radial flange overlapping concentric ends of the bearing pin and the bearing semi-shells, and having a snapping hook located at an end which is remote from the flange a

Abstract: A grinding apparatus including a cylindrical grinding wheel assembly mounted on a vertical drive shaft extending from an electric motor through a horizontal work table. The apparatus includes a pressure sensitive electrical switch for activating the motor in response to downward force on the work table. The work table is supported on a housing adapted to contain the motor and can be interchanged with work tables of various sizes and configurations. The grinding wheel assembly includes a core element and a grinding element where the grinding element is secured to the core element by various mechanisms to allow the grinding element to be removed from the core element while the core element is secured to the drive shaft so as to interchange the grinding element in the event that a grinding element has been worn out.

Abstract: A tapered bearing for the drive drum assembly of a belt grinding machine that employs multiple, parallel, abrasive grinding belts, and back-up shoes for pressing the belts against the surfaces on a workpiece to be ground. The drive drum assembly, in cooperation with small pulleys operatively associated with the contouring head, keeps the abrasive belts properly trained. The central shaft of the drive drum assembly, which has a plurality of large pulleys and spacers positioned therealong, is secured between a fixed bearing support and a laterally movable support bracket. A tapered bearing is fastened to one end of the central shaft, and a complementary shaped aperture is defined in a spindle retained in the movable support bracket. When the movable support bracket is shifted inwardly, by the hydraulic circuitry of the grinding machine, the tapered bearing fits snugly into the aperture so that the drive drum assembly is supported in a rigid, sag-free manner.

Abstract: In an electric hand machine tool, particularly an angle grinding machine, for the purpose of ergonomic handling the handle, together with the switch bar, is designed to be rotatable, relative to the tool mounting on the gear head (11). For the rapid, problem-free changing of the position of the handle relative to the tool mounting, the handle (12) can be locked against rotation on the motor casing, containing the electric drive, in at least two turned positions by a manually operable locking device, and can be clamped on the motor casing by a manually operable clamp device. In a preferred embodiment the locking device (40) and clamp device are coupled together by constraint and are operated simultaneously by means of a single tightening lever.

Abstract: A portable machine tool comprises a drive spindle provided with a tool receiver, a bearing flange which mounts the drive spindle and has a clamping neck, a protective hood which at least partially covers a tool and is held securely against rotation on the clamping neck, and elements for connecting the protective hood and the clamping neck, the connecting elements including a sleeve-shaped plug-on collar provided on the protective hood and having radial projections, an annular groove provided in the clamping neck so that radial projections can engage in the annular groove, and also axial grooves provided in the clamping neck and extending from a free end face of the clamping neck into the annular groove, the axial grooves being arranged and formed so that the radial projections of the plug-on collar can pass through the axial grooves in a plugging-on position which is turned relative to a position of use of the protective hood.

Abstract: A rail maintenance vehicle includes a slide frame along which a grinder may move while the vehicle remains stationary. The grinder may be moved automatically away from the rail as the grinder moves longitudinally along the rail away from the center of a weld bead in order to smooth the grinding at the weld bead. The slide frame is connected by a linkage mechanism such that the grinder may be oriented at different grinding angles over a range of 200.degree.. The grinder is mounted upon a lateral displacer such that the grinder may be moved from one side of the vehicle to the other for grinding on rails on either the right or left side of the vehicle. A turntable system allows the turntable cylinder to pivot up and out of the way to a horizontal position so that the lateral displacer may move the grinder from one side of the vehicle to the other without interference from a vertical turntable cylinder.