Abstract: The chain of an electromotive chain saw is quickly stopped by the combined use of an electric brake and a mechanical brake when a trigger member is turned off. The rear end of a brake band disposed to tighten a brake drum by operating a hand guard is secured to a bent rod. When the trigger member is released, the brake band is normally tightened around the outer periphery of a brake drum by the urging force of a coil spring. When the trigger member is released, a circuit provided with a brake winding is closed, thereby applying a dynamic braking force. When the dynamic brake force is applied, a centrifugal clutch is released quickly and the speed of stopping the brake drum is accelerated.

Abstract: A method of sharpening cutting blades of the type made from bar stock type material, the method comprising producing relief surfaces on the cutting profile surface. The method comprises forming first and second relief surfaces on the cutting profile surface. The first relief surface extends from a location inward of the cutting edge to the back face and is oriented at a first relief angle with respect to a side surface. The second relief surface extends from the cutting edge to the first relief surface and is oriented at a second relief angle with respect to the side surface with the second relief angle being smaller than the first relief angle.

Abstract: An extruded plastic strip contains abrasive grains or minerals embedded homogeneously therein throughout is scored along the machine or extrusion axis direction, such scoring including elliptical or pointed perforations with the long axis or generally pointed ends aligned with the scoring and parallel to the machine or extrusion axis. The preferred plastic material is a 612 nylon, although other plastics may be employed. The material is heat workable, yet relatively stiff and can be used to form a wide variety of power driven abrasive tools such as shown in applicant's prior application Ser. No. 07/471,385 filed Jan. 29, 1990 entitled "Abrasive Tool and Method of Making", now U.S. Pat. No. 5,155,945. The present application also discloses a rotary wheel type tool utilizing the perforated strip, and a method of making that tool using a gel type cyanoacrylate as an adhesive. With the strip of the present invention, rotary wheel tools as well as many other tools can economically be produced.

Abstract: In a method for forming a semiconductor wafer with an orientation flat along a cleavage plane, a groove or hole is formed in the substrate on a line along which the substrate is cleaved to form an orientation flat and the substrate is treated to produce a mirrorlike surface. Then, the substrate having the mirrorlike surface is cleaved from the groove or hole to form the orientation flat. Accordingly, edges of the cleavage plane are not rounded due to the surface treatment. In addition, the substrate is easily cleaved along the cleavage plane from the groove or the hole. As a result, a semiconductor wafer having a sharp cleavage plane as an orientation flat is produced with improved yield, and alignment is performed with high precision in a subsequent process, such as photolithography.

Abstract: Apparatus and a method are disclosed for grinding opposed faces of the hub of a dicing blade flat and parallel while preserving the capability of electroplating the hub with a membrane. Apparatus and a method are also disclosed for obtaining a single or dual rectilinear or curvilinear radial taper of the dicing blade.

Abstract: The machine for abrasive treatment comprises an abrasive tool (1) and a device for establishing the holding-down force within the machining zone, said device having a housing (3) provided with guideways, wherein poppet sleeves (4) carrying spindles (5) are free to reciprocate so as to translate the holding-down force to the abrasive tool (1), and a feed mechanism (14) located on the housing (3). According to the invention, in the device for establishing the holding-down force the poppet sleeves (4) are interlinked through an elastic member which is regidly coupled to the feed mechanism (14), while the latter mechanism is adapted to damp the travel of the elastic member in the forward and reverse directions of feed.

Abstract: An abrasive wheel for grinding the cutting pins of a button-type drilling bit in a grinding machine of the kind provided with a rotatable holder for fixating the pins of the bit in a grinding position and for rotating thus fixated pins. The machine also includes a spindle on which the abrasive wheel can be mounted in a given position. The spindle/holder is linearly movable in a plane which extends through and is contained by the respective rotational axes of the holder and the spindle and in a direction parallel with the rotational axis of the spindle. The abrasive wheel includes circular flange parts which embrace a profiled groove therebetween. To enable cutting pins to be ground to an obtuse tip-profiled shape with the aid of such an abrasive wheel, the profiled groove, when seen in cross-section, is formed symmetrically around a line which intersects the rotational axis of the abrasive wheel at an angle whose complementary angle is equal to the angle of inclination of the spindle.

Abstract: A device for low-cost and convenient sharpening of wood jointer and planer blades or knives.

Abstract: A finishing article comprising a backing member defining a central opening and having two opposed surfaces each carrying an abrasive material thereon; an intermediate member, having a central bore therethrough, being positioned in the opening and attached to the backing member, the central bore is capable of being at least partially threaded for supporting the finishing article to a support member. The partially threaded bore of the finishing article is detachably connectable to a threaded portion of a support member to provide rotational movement from the support member to the finishing article for finishing an object wherein the partially threaded portion of the central bore lies substantially in the plane of the backing member so that both abrasive surfaces of the finishing article can be used for abrasive sanding and, if desired, the abrasive surfaces of the article can carry different grades of abrasives.

Abstract: An accessory is provided for a conventional workshop table saw that allows the table saw to be utilized to sharpen the blades of knives. The accessory includes a channel follower adapted for engagement in a guide channel formed on the flat planar surface of the table saw. A knife cradle is connected to the channel follower and is selectively movable in a transverse direction to adjust the spacing of the knife cradle from both the guide channel and a rotary blade element slot defined in the planar work piece table top. A grinding disk is mounted as a rotary blade element in the table saw and a knife, positioned in the knife cradle, is advanced past the grinding disk to hone the knife blade.

Abstract: A marble and tile cutting apparatus and method wherein the apparatus comprises a support, a tray on the support moving between a cutting and a non-cutting position, the motor mounted on the support and rotary cutting blade driven by the motor to cut marble or tile material and wherein the improvement comprises a motor support wherein the motor may be moved laterally on the table support between preselected cutting positions and wherein the tray is characterized by a plurality of generally longitudinally preselected cutting grooves so as to permit the cutting blade to cut the marble or tile material in a cutting position with the grooves of the tray matching the preselected position of the transversely movable molding and cutting blade for each particular cutting position.

Abstract: A hand tool convertible for chopping and splitting comprises a head including a blade end with a cutting edge, an eye hole extending in an axial direction through the head for receiving a handle, a pair of opposing major side faces extending from the cutting edge around and past the eye hole, and a recess extending into at least one of the pair of side faces, and a wedge element removably received in the recess. In the preferred embodiments the wedge element is asymmetrically positioned with respect to any other wedge elements that may be attached to the head and is generally non-movably mounted to the head by a stud portion received in a recess in the head.

Abstract: A grinding machine for grinding epitrochoidal, hypotrochoidal, and circular bearing races in one set-up without having to move the part and to insure near perfect concentricity between all of the bearing races.A machine blank is mounted on an upper rotary table that is in turn mounted on a lower rotary table. The upper table is driven both by the lower table and by an independent servomotor. The net speed of the upper table is the difference between the two driving speeds of the tables. The axis of rotation of the upper table is capable of being offset from the axis of rotation of the lower table. The two tables are rotated in opposite directions while a grinding wheel is moved laterally into contact with the surface of a rough-machined part to form thr trochoidal surface. The characteristics are determined by the amount of the offset, the diameter of any rollers that are to be positioned between the trochoidal surfaces in the speed change device, and the relative speeds of the two tables.