Abstract: An improved nose sprocket which carries central drive links of a saw chain has a gullet shaped to provide ample space for saw dust to collect and reduce stress concentration within the gullet. The nose sprocket has teeth which define a gullet. The gullet has a bottom portion shaped with a varying radius of curvature. The varying radius of curvature is largest at a deepest portion of the gullet and smallest where the bottom portion meets flank portions of the teeth which carry the central drive links.

Abstract: A chain saw guide bar includes outer side surfaces, a longitudinal groove having side walls, and two edge surfaces. Each edge surface interconnects a side wall and an outer side surface to form therewith inner and outer corners, respectively. To edge-harden the guide bar, the edge surfaces, inner corners, and outer corners are heated above 750.degree. C. Then, the edge surfaces and inner corners are rapidly cooled, i.e, quenched, but the outer side surfaces are cooled more slowly, whereby the inner corners are given a higher hardness than the outer corners.

Abstract: A chain saw includes a drive unit having a drive shaft, and a chain guide bar mounted to the drive unit by two bolts. The guide bar is attached to the drive unit by an insert structure which fits into a longitudinal slot of the guide bar. The insert structure can be oriented in at least two different orientations within the slot for establishing different positional relationships, respectively, between the drive shaft and a longitudinal center line of the guide bar. For example, the center line could be offset either above or below the drive shaft, or the center line could intersect the drive shaft.

Abstract: Cutting insert and tool, wherein the tool has a seat formed by at least 190 degrees of a cylindrical seat surface, and the insert has an outwardly projecting region forming a cutting edge and three convex regions simultaneously touching the cylindrical seat surface at three distinct points. Those points form an imaginary triangle with all angles acute. A center of the cylindrical seat surface lies within the imaginary triangle, and a center of gravity of the insert lies outside of the imaginary triangle. The insert can only be removed from the seat after being rotated by a prescribed angle away from its cutting position.

Abstract: Drive sprocket device for a chain saw, comprising a rim type sprocket located eccentrically in a ring. The ring has recesses on its outside periphery to receive tangs of drive links of a saw chain, and cylindrical surfaces to support the chain radially. On the inside periphery of the ring there are radial protrusions and cylindrical surfaces. The sprocket has recesses to receive the protrusions, and cylindrical surfaces in contact with the cylindrical surfaces formed on the inside periphery of the ring. Alternatively, the recesses in the ring could constitute through-holes, and the tangs of the drive links could extend through the through-holes to constitute the protrusions received in the sprocket recesses.

Abstract: A ceramic monolith coated with a catalytic material is heated by a flat strip cross-section steel wire with at least 15% Cr and at least 0.5% Al. The wire is placed in the monolith near its entry face.

Abstract: Drive sprocket assembly for chain saws, where a saw chain runs around a loose drive ring that rolls upon cylindrical surfaces of a drive sprocket. Drive links of the saw chain project through holes of the drive ring and enter recesses of the drive sprocket to be driven thereby. The recesses of the drive sprocket have an axial dimension substantially larger than the thickness of the drive links, to enable the drive ring and chain to have substantial axial play relative to the drive sprocket.

Abstract: Saw blade, especially a circular saw blade, with replaceable tips wedged in recesses along the periphery of the blade, and held there by elastic forces. Inwards of each recess, but not connected with the recess, at least one tension distributing hole is provided. The contour of the blade body runs inwards from a line between the edges of the tips so far that the bottom of the contour lies farther from the line between the tips than the outer portion of the tension distributing holes, but closer to that line between the tips than the inner portion of said holes. With this arrangement the elastic wedging forces produce tangential tension stresses and only local compressive stresses.

Abstract: Method for making dental crowns or onlays, comprising the steps of forming an aluminium foil (14) after the prepared surface (13) of the tooth or the top (23) of a dental post or implant (21), anodic oxidizing the foil all through to oxide foil, firing the oxide foil at temperatures above 700.degree. C. to alpha-corundum and applying a ceramic top layer.

Abstract: Flat drill bit for drilling holes in wood, comprising a plate (12) with two longitudinal sides (16,17), two main radial edges (14,15) and a pilot point with two converging pilot edges (18,19), where main radial edges, pilot edges and short lateral edges (24,26) being short portions of the longitudinal sides all have positive rake angle, produced by grooves parallel to the edges facing forwards during rotation. For larger diameters the pilot point has two converging pilot edges and two parallel sides (27,28).

Abstract: Method for hardfacing of parts of the edges of a chainsaw guide bar, where the chain is guided by a groove, where a wear-resistant alloy is applied in a molten state to parts of the edges (12,13) of a guide bar blank and solidified in nearly final configuration, comprising the steps of:making a guide bar blank (10) having edges located at greater distance from the groove bottom (18) along the sides (17) which are not to be hardfaced than in those parts (12,13) which are to be hardfaced, andapplying a mold (15) with an extending plate (14) against the blank with the edge (23) of the plate in contact with the groove bottom (18), andfilling the space between the wall (19) of the mold and the edges (12,13) of the blank with a paste (16) made from finely powderized hardfacing alloy and a liquid, andheating the paste (16) locally to melt the alloy.

Abstract: A circular saw blade is disclosed with narrow radial slots to avoid tangential stress. In order to lower the noise level and the cracking failure risk, a narrow arcuate cutout is provided in the direction of the slot adjacent to at least one end which cutout is not continuous with the slot. The parts of the cutout closest to the slot comprise at least one of the ends of the cutout, and the distance from the slot end to the nearest end of the cutout is less than the blade thickness.

Abstract: Flow dividers for dividing a hot gas flow into serveral partial flows through parallel internal channels are used in heat exchangers and as catalyst carriers, and can be produced by shaping the flow divider from metallic aluminium through extrusion or winding, then converting it to hydrated aluminium oxide through anodic oxidation while it is slowly moving down into an electrolyte (4), and finally converting it to alpha-alumina through heat treatment.

Abstract: A closed rim-type drive sprocket for chain saws, comprising two axially spaced plates for supporting the side links of a saw chain, a gear surface disposed between the lateral plates. The gear surface comprises circumferentially spaced teeth forming gullets therebetween. Bottoms of the gullets are inclined by an acute angle greater than 20 degrees relative to the rotary axis to force particles entering the gullets to be displaced toward openings formed in one of the plates.

Abstract: Saws are made by grinding teeth in an edge of a continuously advanced steel strip. The grinding is performed by abrasive members mounted on a frame which is oscillated in an endless path within a plane parallel to a plane of the strip so that the abrasive members intermittently contact the edge.

Abstract: A guidebar for powered saws comprises three plates joined by spot welding, where the outer plates are made from a hardenable steel with carbon content over 0.5 percent without boron and the middle plate from a boron alloyed steel with a carbon content lower than 0.25 percent, thus simultaneously achieving high wear resistance at the chain groove, high strength at the spot welds and high resistance to bending.

Abstract: A sawchain designed for resharpening while it is idling around the drive sprocket has cutting links (16) on the left and right sides with depth gauges (10) and spade-shaped cutters (22) which between their front (12) and rear borders (14) have a fold (13) substantially perpendicular to the lengthwise direction of the sawchain with the concave side outwards away from the central plane, permitting the rear border (14) and the side edge (12) to contact the side walls of the kerf. The depth gauge (10) is placed so far forward on the cutter links (16) that the chip thickness (19) is sufficient when the sawchain is straight. The intermediate drivelinks (21) may be provided with raker teeth (17) located so far to the rear that they do not touch the bottom of the kerf when the chain is straight, but only loosen and convey the chips cut by the cutters (22) of the cutter links (16).

Abstract: A device for detachable and repeatable accurate clamping in X-, Y- and Z-directions of a first object to a second object like a working table (2) to a machine table (1), the first object (1) having a house (3) with a truncated conical surface (15) intended to cooperate with a corresponding conical surface (25) of the second object (2) and clamping member (9), each intended when clamping the second object to the first object by pivoting the clamping member to engage a clamping surface (20) of the second object by a nose (12). According to the invention the house (3) is provided with a first stop face (17) extending across the axis (16) of the truncated conical surface (15) and cooperating with a second stop face (21) arranged in the second object, the mutual position in the Z-direction of the first and second objects being unambiguously determined.

Abstract: The invention relates to a method of measuring the dimensions of tools and/or workpieces of metal. The measuring is characterized in that an electro-erosive material-machining discharge in a dielectric is used as transmitter of pressure waves, the time of which through the tool or workpiece to the arrival in at least three well-defined positions is scanned and gives rise to time-responsive current pulses for a digital measuring system.

Abstract: A pipetter diluter for sampling and delivery of a volumetric material. The pipetter diluter has a sampling and delivery tip connected to a cylindrical container. A threaded plunger is rotated by its threads for movement in and out of the inside surface of the cylindrical container. The in and out movement of the plunger facilitates sampling and delivery of the volumetric material.