Abstract: A cutting tool that has a body with an insert receiving a pocket at an extremity thereof and an insert on a support body which has surfaces complementary to support surfaces of the tool body and seated in the pocket. A cylindrical locking member is received in a bore that extends parallel to the pocket and a locking screw extends through the support body and through an open ended slot that joins the pocket and the bore and threadedly engages the locking member in such a manner that when the locking screw is tightened the insert and support member are locked into the tool body pocket and when the screw is loosened the insert, the support body, the locking screw, and the locking member can be removed from the tool body by sliding the same from the open ended slot.

Abstract: A sprocket wheel, bearing and bearing plate of a chain saw guide bar are mounted as a separate unit between the side plates of the guide bar.

Abstract: A tool shaft is detachably fastened in a tool holder by means of a plurality of gaskets which are each sandwiched between a pair of press rings. The tool shaft extends through the press rings and gaskets. A screw is provided for compressing the gaskets between the press rings. The gaskets are disposed in recesses of larger volume. The gaskets are nonsymmetrical about the longitudinal axis of the tool shaft. When compressed, the gaskets force the tool shaft laterally against the rings to prevent radial misalignment of the tool shaft.

Abstract: A file comprises a handle and a tool connected to the handle. The tool comprises a body and a sleeve encompassing the body. The sleeve is formed of grinding material and includes an exterior grinding surface. Portions of the sleeve are disposed in recessed portions of the body and are fixed therein by tongue portions of the body which are deformed against the sleeve. The file is manufactured by positioning circumferential ends of the sleeve in a longitudinal recess on opposite sides of a ridge extending outwardly from the recess. The tongue portions extend from the ridge and overlie the recess. The tongues are deformed toward the recess and against the sleeve.

Abstract: A rotary drill comprises a shank, two axially extending chip removal recesses, and at least two radially oriented cutting inserts. One insert is peripherally located and is arranged adjacent one of the chip removal recesses. The edge of the peripheral insert extends radially so as to form the wall of the hole to be drilled. Another insert is located radially inwardly of the peripheral insert and is arranged adjacent the other chip removal recess. The inserts extend axially to generally the same extent. The inner insert is offset from a 180 degree relationship with the peripheral insert by an angle, which angle is of such magnitude that the drill is radially balanced.

Abstract: The circular saw blade of the invention is composed of different materials and consists of three concentric zones, -- an inner zone, intermediate zone and an outer zone, -- welded together. The material of the outer zone is a high-speed steel, the outer and intermediate zones are joined together by, for instance, electron beam welding, while the intermediate and inner zones are joined together by a welding method other than electron beam welding.The present invention relates to the saw art, and is concerned with the provision of an improved circular saw blade.

Abstract: The electric plug of the present invention including a base plate, a yoke, a case movable over said yoke and a pair of flat contact pins of American type and also a pair of round pins of European type. The flat contact pins are fixed in the base plate of the plug, while the round contact pins are located in that part of the plug consisting essentially of yoke and case. When the case is drawn upwardly over the yoke, the two components can be tilted as a unit about journals in the base plate so as to expose the flat contact pins for use. When the case is pushed down over the yoke, the round contact pins are exposed for use.

Abstract: A pair of pointed, rearwardly toothed wedge members are pivotally mounted at their rear or blunt ends to spaced positions on a drive handle head, whereby they may be successively and alternatingly driven into a saw cut in a tree by pumping the handle.

Abstract: The rotary cutter tool assembly, including cutting insert, of the present invention is adapted to perform a finishing operation within a tube in such manner that tube wall thickness is ensured. To this end, the novel insert is provided with a guiding surface adjacent to the cutting edge of the insert, which guiding surface is displaced towards the central portion of the insert at a distance corresponding to the desired depth of cut. The insert is secured to the rotatable cutter head in such relation that said guiding surface precedes the cutting edge in the direction of rotation of the cutter head.

Abstract: A metallic body in which great wear resistance is coupled with excellent mechanical strength and toughness is composed of sintered cemented carbide particles in a matrix of graphitic cast iron-base alloy, the content of carbon plus other constituents known to be equivalent to carbon in their influence on the cast iron amounts to 2.5 - 6.0%, preferably 3.5 - 5.0%.

Abstract: For fastening a cutting die on a base plate, the device of the invention comprises clamps insertable in recesses provided in the die, the lower part of the die being received in a slot in the base plate. The clamps are composed of bridge elements, and the recesses in the die are keyhole-shaped and open downwards.

Abstract: The drill of the invention comprises a drill head having at least one guide pad, at least one outer cutting insert located at the periphery of the drill head surface and at least one inner cutting insert, having an active cutting edge, located nearer to the center of the drill head surface. The active cutting edge of the inner insert is situated within the outer edge of the guide pad or pads. Preferably, a plurality of cutting inserts are so arranged on the drill head that the resulting cutting force at all engaged inserts is on a level with the outer end of the guide pads.

Abstract: In the percussion drill rod assembly of the present invention rotary force is transmitted through a tubular member of the assembly while impact force is transmitted through the rod member centrally located in the tubular member. Either of said rod and tubular members is provided with radially extending protrusions which guide said member with respect to the other member while enabling flushing medium to pass between said members.

Abstract: The invention concerns a cutting insert, having the shape of an isosceles triangle, which comprises a polygonal flat plate the top and bottom surfaces of which intersect with two edge surfaces of equal length to define main cutting edges, and at least one other edge surface adjoining said two edge surfaces at two cutting corners while intersecting with the top and bottom surface at right angles. The plate has the shape of an isosceles triangle the base of which is formed by said other edge surface. Secondary cutting edges are provided. The invention also involves a rotary milling cutter provided with a plurality of the cutting inserts.