Abstract: A drill bit is provided which has a central tine and first and second cutting tines, provided one on each side of the central tine. The lowermost end of each of the cutting tines is sharpened for cutting the stock. Thus the drill bit cores the material to form a hole thereby reducing the amount of material that must be cutaway. Further, the cutting tines are formed so as to have an enlarged distal head so that the main body portion of each of the tines has a slightly smaller cross-section than the cutting head. In this manner, friction can be reduced between the edges of the tines and the edges of the material being worked. Even further, the tine bit includes cutting blades between the central tine and the cutting tines in the event the stock is thicker than the length of the cutting tines.

Abstract: A cutting tool assembly including an elongated pilot holder and a cutter blade adapted to be transversely positioned in a transverse slot in the pilot holder. The cutter blade includes cutting edges along one transverse edge of the blade and notches in the upper and lower transverse edges of the blade for respective coaction with a set scrw received in a threaded central axial bore in the lower pilot end of the pilot holder. In use, the lower pilot portion of the pilot holder is positioned in a previously provided pilot hole in a plate member, and the pilot holder is lowered and simultaneously rotated to move the cutting edge of the cutter blade into the upper face of the plate member to perform a cutting operation in the upper face, whereafter the pilot holder and cutter blade are raised, the set screw is loosened to allow removal of the cutter blade from the pilot holder, the pilot holder is lowered to dispose the slot below the lower face of the plate member, the cutter blade is rotated through 180.degree.

Abstract: A drill includes a plurality of lips with enlarged portions at one end defining heads therefore. The heads form frusto-conical surfaces and cutting edges extend from the frusto-conical surfaces to remove chips. The cutting edges are limited in size with respect to the frusto-conical surfaces to control the removal of chips and a pocket behind each head readily receives the shavings to convey the latter away from the one end.

Abstract: A cutting tool assembly of the type including a pilot holder and a cutter blade received in a transverse through slot in the pilot holder. The cutter blade is mounted in the transverse slot in the pilot holder in a manner to allow ready replacement of the pilot blade and in a manner to allow the cutter blade to self-align with respect to the central axis of the pilot holder to minimize the stress loading in the cutter blade and minimize blade breakage. In one embodiment, the cutter blade is mounted in the pilot holder by a cartridge which is received in a threaded bore in the pilot portion of the pilot holder and which includes a spring biased pin projecting upwardly into the transverse slot in the pilot holder. In another embodiment, the cutter blade is mounted in the transverse slot in the pilot holder by a pin and slot connection provided by a slot in the blade and a pin passing through the pilot holder.

Abstract: A twist drill having a longitudinal axis and major flanks ground by helical face grinding by means of a grinding wheel having a grinding face perpendicular to its axis of rotation and a circumferential profile, each major flank terminating in a cutting edge and having a surface which defines a clearance angle relative to the cutting edge wherein: the drill has an outer diameter and a central solid core having a thickness equal to 25% to 40% of the outer diameter; and each major flank is ground by a grinding operation performed by rotating the grinding wheel while its grinding face forms the major flank, effecting angular movement of the drill about its longitudinal axis and relative to the axis of rotation of the grinding wheel, effecting relative radial movement between the grinding wheel and the drill in the direction perpendicular to the drill axis and away from the axis of rotation of the grinding wheel, and effecting axial movement of the drill along its longitudinal axis toward the grinding wheel in a p

Abstract: A drill for piloting holes, drilling holes, countersinking and counterboring holes in wood or wood-like materials comprises:(a) a plurality of coaxial, stepped sections with cutting interfaces between,(b) at least one radial flute,(c) chucking means, and(d) a counterboring section.

Abstract: A cutting tool especially for use on KEVLAR comprises a rotatable holder and an insert which is attached on the holder. The insert has a particular shape useful for shearing the KEVLAR fibers and forming a countersink.

Abstract: A drill accessory kit for mounting screw-type fasteners is comprised of several drill bit holders and a screwdriving attachment. The bit holder engages a common twist drill bit in the chuck of a drill and allows one to drill a pilot hole to a desired depth in a workpiece with a cutting action which provides a proper-shaped hole for clean flush mounting or countersinking of a screw. Subsequently, the screwdriver attachment slips over the drill bit and engages with the bit holder, allowing a quick change from drilling to powerdriving of a screw.

Abstract: The present invention concerns in brief a drill (1) for making of preferably through installation bores, through which bores flexible shafts, cables and the like can be lead in. The drill (1) comprises a bore crown (2) and a shank (3). The bore crown (2) has main cutting edges (6, 7) for forward drilling, side cutting edges (8) for radial drilling, and end cutting edges (9) for rearward drilling. The shank (3) preferably has a significantly smaller thickness than the area being drilled by the main cutting edges (6, 7).

Abstract: An improved tool holder for a metal removing machine includes a generally cylindrical head having a longitudinal passageway formed co-axially therethrough. The outer cylindrical surface of the head includes means for supporting one or more cutting tools thereon. The inner surface of the passageway formed through the head includes a threaded intermediate diameter portion and a relatively smaller diameter portion. An insert ring is disposed within the passageway at the junction of the intermediate and smaller diameter portions of the passageway. The insert ring includes a ramp surface which provides a smooth transition from the intermediate diameter portion to the relatively smaller diameter portion. A generally hollow cylindrical collet is provided which is sized to fit within the threaded intermediate portion of the passageway. The collet includes an enlarged end portion having a first chamfered edge adapted to abut the ramp surface of the insert ring when the collet is inserted in the passageway.

Abstract: The invention provides a specialty tool useful for cleaning out broken off or cut off plastic pipe and glue in plastic fittings and plastic couplers. An arbor for use with a manual or electrical operated drill is provided with a smooth portion and a threaded portion. The threaded portion terminates in a screw head. Positioned on the arbor adjacent the screw head is an internal guide disc sized to fit inside the broken off or cut off plastic pipe to be removed from the plastic fitting or coupler. A circular cutting head having sharpened protrusions along the circumference is positioned next to the internal guide disc. A retaining nut slipped down over the smooth arbor shaft is tightened down against the circular cutter and retains both the cutter and the internal guide disc firmly on the arbor shaft. The assembled device is useful for the removal of broken off or cut off plastic pipe remaining in an otherwise useable plastic fitting or coupling.

Abstract: The bit (1, 101, 201) includes a pointed tapered drill portion (10, 110, 210) with cutting edges (14, 114, 214), an abrasive frustoconical grinder portion (20, 120, 220), and an abrasive cylindrical reamer portion (30, 130, 230). The drill portion (10, 110, 210) produces a hole. The grinder portion (20, 120, 220) grinds and enlarges the hole. The reamer portion (30, 130, 230) finishes the hole. The drill portion (10, 110, 210) is carried by a shaft (12, 112, 212) that is received into an axial opening (40, 140, 240) through the grinder and reamer portions (20, 30, 120, 130, 220, 230). The drill portion (10) and grinder portion (20) may form a substantially continuous taper. In another embodiment, the drill portion (110) has an arrowhead configuration. In another embodiment, a radial slot (224) extends through the grinder portion (220), and the drill portion (210) extends axially and radially from the slot (224).

Abstract: The cutting rate of a spade bit is greatly improved by the provision of radial flutes on the lateral shoulders of the bit, extending transversely to the bit axis. Further improvements are obtained if the shoulder flutes are stopped by spurs positioned at the outer ends of the shoulders.

Abstract: The invention pertains to a self-cleaning high speed core boring tool for enlarging an existing deep hole. The elongated tool includes a shank held within a rotating tool holder, a central portion upon which cutting elements are mounted in diametrically located relationship, and the forward end of the tool comprises a cylindrical extension having a pair of spiral flutes defined therein each of which communicates with a cutting element for receiving chips. The flutes spiral in a direction opposite to the direction of tool rotation during boring whereby chips received within the flutes are displaced forwardly of the cutting elements to keep the cutting area free of chips.

Abstract: A hole opener for placement in a drill string having a body generally comprising a collar, a triangular mid-section, a triangular shaped pilot and a bull nose. The collar provides means for attaching the tool body to the drill string. The triangular mid-section has three longitudinal, radially spaced apart blade members that are parallel to the central axis of the tool body so that the blades can cut into the walls of the bore hole to enlarge the size of the bore hole. Three annular flow zones span the distance between the blade members so that fluids and cuttings can circulate through the bore hole. The pilot section also has three longitudinal, radially spaced apart blade members that are parallel to the central axis of the tool body bore and three annular flow zones which span the distance between the blade members of the pilot. The pilot section is downhole from the mid-section.

Abstract: A drill/reamer bit is described that is particularly suitable for high speed operation and which comprises a bit having a "split" pilot or drill portion with four facets and two cutting edges on each web and a "step" or reamer portion having two reliefs and one cutting edge associated with each web, the webs being formed by a pair of flutes angled at from approximately 81/2.degree. to approximately 23.degree., the bit being formed primarily of fine grain tungsten carbide material, the drill portion having an included angle of approximately 118.+-.2 degrees.

Abstract: A method for reducing the incidence of wire breakage in orthopaedic surgery wherein said wire passes through apertures drilled in bone fragments for effecting a wire connection therebetween during healing. Said method comprises removing stress raising corners or edges, caused by the formation of said apertures, from positions in said bone fragments which are in contact with said wire. Manipulation of an aperturing drill or the utilization of novel radius cutters is utilized in effecting removal of said stress raising edges. The novel rotating radius cutters comprise arcuate cutting surfaces and integral drill or aperture positioning means.

Abstract: A twist drill is provided with a countersink and collar assembly. The countersink includes a body with a face which cooperates with a similar face of the collar to trap a pair of balls between them. The faces being conical, enable the balls to be driven radially inward into the drill flutes by tightening the collar onto the countersink. A chip deflector is provided at the cutting edges of the countersink.

Abstract: An extensible drill assembly comprising a plurality of separate drill members having different drill diameters which are arranged to permit assembly of two or more of the drill members into a continuous drill combination having a stepwise increasing diameter from the outermost drill member.

Abstract: A self-feeding, self-aligning drill bit includes a working end with a cylindrical portion having a desired cutting diameter and a conical threaded portion extending therefrom terminating in a threaded tip. The diameter of the threaded portion increases from the tip toward the cylindrical portion such that it approaches the diameter of the cylindrical portion at their juncture. One or more flutes extend longitudinally through both the cylindrical portion and the threaded portion to form one or more cutting edges extending at an angle relative to the axis of the drill bit. The threaded portion may include one or more peripheral grooves staggered along the length of the threaded portion to provide additional cutting edges to reduce cutting torque. The threaded portion not only pulls the bit into the workpart but also the cutting edges thereof function to cut a preliminary hole and also cut apart the workpart debris to significantly reduce chip size.

Abstract: There are disclosed herein power tool boring bits having boring depth indicating markings on the shanks thereof. The markings are produced by colored oxiding of substantially the entire shank of the tool followed by selective abrasion of the shank to remove bands of substantially only the thin surface oxide in alternate array with bands of the colored oxide.

Abstract: A method and tool for drilling countersunk holes in a composite of materials having different strength and elastic characteristics. The tool includes a front hole cutting section for initially generating the hole, and a rear countersink cutting section providing an enlarged tapered entrance to the hole. The tool has a single flute which extends axially along the length of the front and rear tool cutting sections. The front cutting section includes a planar end surface which is inclined relative to the tool axis and which defines with the flute and a cylindrical outer surface of this section, a single end cutting point and adjacent radial and longitudinal cutting edges. The rear cutting section includes an outer surface which extends radially outward and axially rearward from the front cutting section, and which intersects a leading side of the flute at an acute angle to define a countersink cutting edge.

Abstract: A tool support is provided for removably supporting a twist drill of high speed steel and a pair of indexable cutter blades of tungsten carbide. The cutter blades are triangular and provide three cutting edges about the periphery thereof, and the cutter blades are removably mounted on the tool support to enable selective indexing of the cutting edges to a cutting position. The cutting edge to be used is axially and radially stabilized in the cutting position by engaging edge and bottom portions of the blade in a pocket provided on the tool support. The tool support includes a channel adjacent each of the cutter blades defined by walls extending axially of the tool support in planes parallel to the tool axis and perpendicular to one another to optimize the available area for chip removal, and the entrance ends of the channels are provided with relief surfaces to promote the feeding of chips into the channels.

Abstract: This disclosure relates to apparatus and method of forming circular holes in plate glass. A circular cut is made in the glass to a predetermined depth, which is less than the thickness of the glass by approximately 0.5 to 1.0 mm. After this cut has been made, the cutting apparatus is removed and the glass is softly struck adjacent to the circular cut in order to break loose the glass disc enclosed by the cut. The edge or margin of the hole may then be smoothed by grinding or polishing. The glass cutting apparatus includes a circular saw or glass cutter which is rotated to cut the glass. A stopper of the apparatus is adjustably mounted adjacent the cutting edge of the saw and stops the saw from cutting further after a predetermined depth has been reached. The position of the stopper may be adjusted for different thicknesses of glass.

Abstract: Bit for drilling wood or the like consisting of a spade from which extends a centrally-located point, the point being provided with a groove defined by two plane surfaces extending at an obtuse angle.

Abstract: A drill assembly has two inserts clamped in the respective radial recesses formed in the body. One insert has a straight edge and the other insert has a notched edge. The arrangement is such that the notched edge of the other insert is disposed slightly above the straight edge of one insert.

Abstract: A boring tool of the self-feeding type is disclosed which includes a plurality of cutting members secured to a body and a self-feeding member operative to draw the boring tool into the workpiece. The cutting elements are positioned on the body in such a manner as to provide a depth of cut correlated to the rate of advancement effected by the feed member thereby insuring smooth even efficient cutting action of the boring tool. Additionally, the body is provided with a work engaging surface portion operative to further insure controlled even advancement of the boring tool through the workpiece. A retaining member is also provided in the body member which is operative to retain a one piece feed membershank within the body and to maintain the self-feeding member in close proximity to an adjacent cutting member so as to prevent wrapping of wood fibers or the like about the self-feeding member.

Abstract: A boring tool is disclosed for machining holes in various materials which comprises a one piece body have a plurality of cutting members secured thereto in circumferentially spaced relationship. The cutting members are designed so as to enable them to be interchanged between a variety of different diameter bodies, the number of such cutting members increasing with greater diameter bodies. The body is provided with mounting surfaces positioned in such a manner so as to automatically accurately locate the cutting elements with respect to the body and to substantially eliminate any shear loading on the fastening elements securing the cutting members thereto thereby enabling use of only a single fastener element to secure each of the cutting members to the body. The cutting members are preferably circumferentially and radially spaced relative to each other so as to substantially balance the cutting loads thereby assuring positive accurate hole formation.

Abstract: Tool for drilling holes, such as cylinder head drill, woodworking drill, and the like, which includes a carrier member having at least one endwise arranged end face cutter, or first cutting means, and at least one precutter, or second cutting means, extending in endwise direction, and circumferentially beyond the carrier member, the precutter defining the diameter of the hole to be produced with the tool and including at least one cutting edge. At least the part adjacent the cutting edge of the precutter is approximately parallel to the pertaining circumferential portion of the carrier member. The outer side of the precutter includes at least one guide surface parallel to the outer circumferential portion of the carrier member. The end face cutter and the precutter are removably securable with at least one clamping element to the carrier member and can be in the form of reversible cutting elements.

Abstract: A stump cutter is disclosed having a rotatable shank upon which a transverse support bar is attached. Tool holders are mounted in a distributed relation on the support bar and replaceable cutter bits are mounted in the tool holders. Mounted on the forward end of either the shank or support bar is a pilot member that holds the stump cutter engaged to the stump during cutting operations.

Abstract: A countersinking tool comprises a disposable, flat, chip-like cutting insert mounted on a holder rotatable about its axis. The insert is readily assembled or disassembled on the holder by turning a pin which extends through holes in the insert and the holder. The insert has a flat inside surface for seating on a flat surface on the holder, and the insert has a pair of flat, peripheral side surfaces each of which engages against a respective flat surface or locating portion on the holder to locate the insert in a cutting disposition on the holder. The insert and the holder have various features which cooperate to promote the countersinking function.

Abstract: A drill bit for drilling holes of a given diameter in wood or similar material comprising a drill body having a series of stepped cylindrical portions increasing in diameter from the small entry end of the drill to the full diameter of the hole to be drilled whereby the drill body is of generally conical shape. Each of the cylindrical portions extends in a helical direction, and a single flute extends generally lengthwise of the drill body to provide cutting edges for the cylindrical portions and a discharge path for material cut from the workpiece. The flute extends generally parallel to the axis of the drill and forms approximately a right angle in transverse cross section, occupying approximately one fourth of the cross sectional area of the drill body. A male thread extends helically along each of the cylindrical portions excepting the largest full diameter portion and projects radially outwardly from each of such portions to engage the walls of the workpiece and thus feed the drill through the workpiece.

Abstract: A rotary tool having a working part and a shank. The working part is formed by at least two axial portions of which the first portion is made with the profile of a twist drill for making a pilot hole, and the second portion is disposed axially between the first portion and the shank. The second portion is made in such a manner as to enlarge the pilot hole upon entering it and to ensure self-feed of the tool in the axial direction. This permits substantial reduction of required force for axial feed of the tool, improves productivity and allows making holes of different diameter with one and the same tool.

Abstract: The invention relates to a bit for boring a hole in wood or the like, the bit having a surrounding skirt to give the bit axial stability during a boring operation, and, a leading spur to produce a circumambient groove prior to and deeper than the cutting blades to prevent material being cut from the bore, from splintering beyond the perimeter of the bore and thus produce a smooth wall surface.

Abstract: A cutting tool is disclosed which has an axis of rotation and comprises a cutting portion having a tapered body and a generally conically shaped surface. Wall means extend radially into the tapered body and define a curved cutting face wall. A relieved land surface extends to and meets the cutting face wall to define a curved cutting edge. The curved cutting edge is located substantially on or at the conical surface of the tapered body. A lateral support surface is located substantially at or on the conical surface of the tapered body and at a positon generally diametrically opposed to the curved cutting edge. The conical surface of the tapered body is substantially recessed rotatively ahead of the cutting edge to the lateral support surface to provide space for chips and is, also, sufficiently recessed rotatively rearwardly of the cutting edge to the lateral support surface to prevent that area from making contact with the workpiece.

Abstract: Disclosed is a method and apparatus for repairing a buried main having connected lateral service conduits. In the method, a main is opened and cleaned of debris. Thereafter, an elongated conduit liner is axially inserted into a length of the buried main. The lateral service conduits are opened and cleaned from a point remote from their connection to the main. A dispenser is axially inserted through the service conduit to a point adjacent to the connection. At the connection, polyurethane material is dispensed into a portion of the service conduit and in the annular space between the main and the liner. Thereafter, the dispenser means is removed from the service conduit and the polyurethane material is allowed to set. A cutter apparatus is axially inserted into the service conduit and is manipulated to form a port through the polyurethane material and the wall of the liner to connect the service conduit to the liner.

Abstract: Drill bit of the type having a shank, a spade cutter, and a lead point with concave sides.