Abstract: A drilling tool for producing a bore with a cylindrical inner wall can be rotatable in a rotary movement with a predetermined rotational direction (VD) about a tool axis (A) extending through the drilling tool, and at the same time is movable in an axial forward movement (VB) in a forward direction axially to the tool axis. The drilling tool comprises at least one drilling area (3) arranged in a forwardly located region of the drilling tool at a forward or free end, but preferably not having a thread forming region. The drilling area has a number n of drilling edges which are arranged offset to each other in the rotational direction, and at least one chip divider is arranged on at least one or each of the n drill cutting edges, where the chip divider forms an interruption of the respective drill cutting edge.

Abstract: An assembly is provided for forming holes in a workpiece. The assembly includes an arbor, a pin sleeve and a cutting device. The arbor has a nose having at least one threaded portion and at least one unthreaded portions on an external surface thereof. The arbor also has at least one pin passageway extending therethrough. The pin sleeve has at least one pin extending from a main body. The arbor extends through the pin sleeve. The cutting device has a back plate and a plurality of teeth extending therefrom. The back plate has a passageway defined by a wall with at least one threaded portion and at least one unthreaded portion. The at least one threaded portion of the cutting device is capable of engaging with the at least one threaded portion of the nose, and the at least one pin of the pin sleeve is capable of engagement with the at least one pin passageway of the arbor to secure the components together.

Abstract: The present invention relates to a quick-change attachment means for a hole saw, which is directed to a tool for use with a hole saw for boring holes on a wooden plank, particularly a quick-change attachment means for quickly replacing a longitudinal body, which is a drill bit shank having a driving end, a tool end, and a limiting portion. The present invention is characterized by: it is a quick-change attachment means for assembling a longitudinal body and a hole saw, it has an axial hole for allowing a longitudinal body to move on a quick-change attachment means, a locking component for locking and releasing the longitudinal body on and from the quick-change attachment means. The locking component has a first component and a second component, which when used, the longitudinal body can be easily moved slidably and locked so the shreddings emerging from the hole saw can be cleaned.

Abstract: The hole saw apparatus cuts a hole in an existing work object such as drywall, for example. Floor and ceiling cuts as well as other hole cuts are also provided for. The apparatus enables a hole to be cut in the existing work object while guarding against electrical wire damage. The shank may be hexagonal and is chucked into an existing drill. Any existing wire is pulled through the guarded cylinder and even inserted into the sleeve if needed. The apparatus is then free to rotate around the wire and cut the desired hole. Upon completion of hole cutting, the apparatus is pulled away from the work object without damaging the wire. After cutting, a plug usually stays within a hole saw. The sliding mechanism of the apparatus provides for easily removing the cut plug from the hole saw.

Abstract: A breakage resistant hole saw that reduces damage of the pilot hole drill bit caused by the sudden contact of the cutting teeth on the hole saw's cutting body against the hard working surface after the drill bit has penetrated through the working surface. The hole saw disclosed herein includes a cylindrical cutting body mounted on an arbor. Formed on the circular lower edge of the cutting body is a plurality of angled teeth that cut through a working surface when rotated in one direction. Mounted on the end of the arbor is a pilot hole drill bit with a spiral cutting flute configured at a spiral cutting angle to penetrate the working surface when rotated in a direction opposite the cutting direction of the cutting teeth on the cutting body. Also disclosed herein is a method for forming a hole using a hole saw that reduces damage to the pilot hole drill bit.

Abstract: A saw tool for a machine tool that includes at least two saw tooth sequences. Each of the saw tooth sequences has a plurality of saw teeth, wherein a toothless chip space is arranged between successive saw tooth sequences. The first saw tooth directly adjacent to a chip space has a tooth geometry differing from that of the other saw teeth within a saw tooth sequence.

Abstract: A cutting apparatus may comprise a cutting head having a cutting edge that may be operable to cut through a surface, a pilot drill bit that may be operably coupled to the cutting head, a housing, and an inner shaft that may have at least a portion housed within the housing. The inner shaft may be operably coupled to the cutting head. The inner shaft may also be rotatable to cause the cutting head to rotate according to a rotation of the inner shaft to cut a circular shape. The apparatus may be used to cut through one or more surfaces, such as a soffit and a roof, from underneath the soffit and the roof.

Abstract: A hole-saw assembly including a hole-saw having at one end a plurality of cutting teeth and at the other end a base having two holes therethrough. two shafts. The assembly includes a mandrel coaxially aligned with said hole-saw and including a body having two bores therethrough, and an annulus located on top of the body which is coaxially aligned with said mandrel and hole saw. The annulus includes two shafts co-axial with the mandrel bores, and is rotatable around its longitudinal axis from a first to a second position. In the first position the annulus shafts are aligned with the base holes allowing the shafts to be freely insertable and removable and in the second position the shafts are misaligned to lock the shafts to the base. In one embodiment the mandrel bores are shaped to accommodate rotation of the shafts, and in a further embodiment, the shafts are configures to rotate within circular mandrel bores.

Abstract: A power tool combination includes a power driving device having a chuck device attached to a barrel for engaging with a driven tool member, a control ferrule engaged onto the barrel, and a non-circular member, and a tool device includes a housing having a bore for receiving the driven tool member, and having a compartment for receiving the barrel, and having a non-circular engaging member for engaging with the non-circular member and for allowing the housing to be rotated by the power driving device. The tool device includes a tool element attached to the housing, and a securing device for detachably attaching the tool element to the housing.

Abstract: Described is a quick-change arbor for a tool, in particular a hole saw (2), the arbor comprising a longitudinal body (3) having a drive end and a tool end, means (6) for attaching the tool which are provided with a central hole allowing a sliding of the attachment means (6) over the longitudinal body (3), and means for rotationally and axially locking the attachment means (6) to the longitudinal body (3). The attachment means (6) are slidably releasable from the longitudinal body (3), and can after applying a latch (9-1) in the attachment means (6) simply be slid over the body in order to push a plug of the sawn material out of the hole saw (2).

Abstract: A cutting tool of the sort used for deep hole drilling has a cutting head mounted on a shank. The cutting head is formed asymmetrically with respect to a longitudinal axis and has at least one cutting edge. The cutting head has guiding segments that extend from a forward end to a rear end of the cutting head. Each of the guiding segments has a guiding pad in the periphery thereof. A forward end of the guiding pad lies on a cylindrical envelope defined by the cutting diameter of the cutting tool. A rear engagement portion of the cutting head is engaged with a forward engagement portion of the shank. The cutting head is made from sintered carbide powders and the guiding pads are integrally formed with the cutting head.

Abstract: A device for cutting a hole, such as in sheet metal is provided. The device includes an axially rotatably cylindrical body that is operable with a rotatable drive. A distal end portion of the body includes a replaceable cutting tip and a replaceable pilot. The cutting tip is secured within a notch in the body and extends distally from the distal end portion. A shank portion is also provided which is adapted for securement within a rotational drive mechanism, such as a hand held drill.

Abstract: The hole saw assembly provides a structure and method for efficiently and securely connecting a hole saw to an arbor and easily connecting a pilot bit to the arbor. The arbor has a shank opposite the coupling end and a receiving slot proximate to the coupling end. The receiving slot is adapted to receive a mounting tag of the hole saw to couple the hole saw to the adapter body. The arbor also includes a selector sleeve slidably coupled to the body for movement between a first position allowing the receiving slot to receive the hole saw and a neutral position wherein the selector sleeve prevents removal of the hole saw mounting tab from the receiving slot.

Abstract: A drill bit 10 for creating and using a pilot hole 101 in a workpiece 100 to produce a finished hole 102 in the workpiece 100 centered around the pilot hole 101 wherein the drill bit 10 includes an enlarged cutting head member 30 mounted in a concentric relationship to an elongated guide head member 40 wherein both of the head members 30 40 are mounted on a shaft member 20 connected to a power drill 200 such that the elongated guide head member 40 engages the sides of a pilot hole 101 in a workpiece 100 to act as a guide element for the enlarged cutting head member 30 to create the enlarged finished hole 102 in the workpiece.

Abstract: A drill bit 10 for creating and using a pilot hole 101 in a workpiece 100 to produce a finished hole 102 in the workpiece 100 centered around the pilot hole 101 wherein the drill bit 10 includes an enlarged cutting head member 30 mounted in a concentric relationship to an elongated guide head member 40 wherein both of the head members 30 40 are mounted on a shaft member 20 connected to a power drill 200 such that the elongated guide head member 40 engages the sides of a pilot hole 101 in a workpiece 100 to act as a guide element for the enlarged cutting head member 30 to create the enlarged finished hole 102 in the workpiece.

Abstract: A rotary cutting tool has an axially moveable drill pilot supported in the forward end of an arbor. A first set screw connects the arbor to an annular hole cutter. A second set screw connects the arbor to the drill pilot. The drill pilot has an integral collar that engages the inner end of the hole cutter to prevent the drill pilot from being ejected from the arbor in the event that the second set screw is disengaged from the drill pilot.

Abstract: A plug ejecting hole saw includes a saw cup provided at a front annular edge wall thereof with a plurality of forward protruding angled cutting teeth, and having at a rear end thereof a circular base wall having therethrough a non-circular aperture concentric with the cup. An arbor holder removably attachable to a saw cup of a selected size includes a collar axially slidably holding therewithin a central body having a front nose piece which protrudes axially outward of the collar, the front nose piece having a transverse cross-sectional shape adapted to be inheritably received into the saw cup aperture. The nose piece has formed in longitudinal wall surfaces thereof a pair of diametrically opposed, longitudinally disposed grooves, each of which longitudinally slidably holds therewithin a locking tab member urged forward to abut a separate one of a pair of diametrically opposed, front transversely disposed web ribs formed in the nose piece axially inward of the front transverse face of the nose piece.

Abstract: A drill particularly suited for drilling holes for dental anchors. The drill has a central shaft including a proximal end having conventional connection structure for attachment to a powered rotatable appliance and a distal end bearing a forwardly projecting pin which occupies and is guided within a pilot bore. The pin has a blunt, preferably spherical, enlarged head. The blade is mounted on the central shaft between the proximal and distal ends of the shaft. The blade is preferably annular, having cutting teeth facing the distal end of the shaft. At least one relief communicates between the interior of the annular blade and the exterior thereof.

Abstract: A cutting tool assembly which is adapted for use in combination with a drill for cutting a hole in a work piece. The assembly includes a u-shaped blade and a mandrel assembly for fixing the blade to the drill, a dust shield which surrounds the blade and a stabilizer which can be fixed adjacent the blade. In one construction, the blade includes tips which are removably connectable to a wing portion. Also, a coating of wear-resistant material may be applied to the tips so that the blade is self-sharpening during cutting operations.

Abstract: A holesaw includes an arbor for supporting a pilot drill and a bell-shaped sawblade. The sawblade is attached to a lower threaded portion of the arbor. A pin support with at least one pin engages the top of the holesaw blade and is axially movable but not rotationally movable relative to the arbor. A clamping sleeve is threaded onto an upper threaded portion of the arbor. The clamping sleeve can be screwed down to press against the bell top of the sawblade. A spring may be disposed between the clamping sleeve and the pin support.

Abstract: A multi-function drill bit assembly with slideably positionable hole saw comprising an elongate bit member, a reversible arbor member, and a hole saw member. The elongate drill bit member has a drilling portion and an attachment portion, with the drilling portion having a sharp cutting tip and the attachment portion having at least one flat surface running longitudinally across. The reversible arbor member has a cylindrical cavity extending axially therethrough with the attachment portion of the drill bit member being slideably disposed in the cylindrical cavity. The arbor member has a first portion and a cylindrical skirt portion, the cylindrical skirt portion extending outwardly from the first portion and being generally concentric with the cylindrical cavity. The cylindrical skirt portion has an exterior surface with a first set of threads running circumferentially across. The hole saw member has a cylindrical body with a closed end and an open end.

Abstract: An adaptor for stable mounting of a rotating tool in a drilling machine is disclosed, said adaptor comprising a continuous shaft (1), provided in one end with means (2) for fastening in a drilling machine and in the other end with a thread (3) for mounting of the tool, and an element (4), which in relation to the shaft, is movable in axial direction and fixed in the rotating direction, said element being provided with at least one driving pin (5) placed parallel to the shaft, but radially spaced in relation thereto, at least one driving pin being able to engage into a corresponding hole of the tool, characterized in an abutting element, which at least partly can be displaced in axial direction and clamped against the tool.

Abstract: A coring reamer for use in removing a bone core for use in a graft. A cylindrical tunnel is aimed at a bone. The coring reamer is inserted through the cylindrical tunnel and operated to form a bone tunnel. The bone core is removed from the coring reamer and a ligament replacement is attached to form the graft. The coring reamer includes a cylindrical hollow tube with a series of cutting teeth projecting from its distal end. At least one opening is provided in the wall of the coring reamer tube so that the bone core may be more easily removed from the reamer.

Abstract: A new long bit hole saw arbor for allowing a user to drill a hole in a material using readily available EMT conduit as a cutting saw member. The inventive device includes an arbor member, an attachment shank extending from the arbor member to permit mounting of the invention to a power tool, a saw member inserted into the arbor member, and a chuck member and a drill bit extending from the arbor member through the saw member.

Abstract: A shaft sized to fit conventional hole saw mandrels has two set screw flats and a retaining head. A cylindrical roller is mounted on the shaft against the retaining head, and a cylindrical spacer is mounted by set screws on the shaft above the roller. The roller is sized to fit the diameter of holes typically desired to be enlarged. The shaft, roller and spacer assembly is mounted in the mandrel of a conventional hole saw using the second set screw flat so that the roller extends beyond the cutting edge of the saw. The roller is inserted into the existing hole and guides the hole saw as the hole saw is turned by a drill or other means. In an alternate embodiment, the roller has side flats, allowing the device to enlarge oblong holes having parallel sides.

Abstract: A bone contouring tool for removing bony tissue surrounding an implanted dental implant and having an elongated shank with a blade and a pilot pin disposed at one end. The pilot pin extends downwardly from the blade and provides guidance during removal of the bony tissue.

Abstract: A hole saw arbor includes an arbor body defining an axial rotation axis and has, at one end, a shank for mounting to a drill chuck, and at the other end, a hole saw receiving, axially directed, threaded shaft. The arbor includes a thrust member coaxially received by the arbor body such that the thrust member is movable in the direction of the rotation axis. The arbor further has at least one movable pin retained by the arbor body in the direction of the threaded shaft for engaging a corresponding hole in a bottom surface of the hole saw, to prevent rotation of the hole saw relative to the arbor body; and an adjustable locking member for locking the thrust member against the bottom surface of the hole saw. Thereby the hole saw, when engaged by the thrust member and the at least one pin, does not wobble off-axis.

Abstract: A device is provided for cutting dowels from a bone mass which is easily disassembled for cleaning and sterilization. The dowel cutter includes an axial mounting member having a proximal end portion configured for engagement with a drill chuck and a distal end portion configured to receive a cylindrical cutting blade, an elongated supporting shaft having a distal end portion configured to support a drill guide, and a securement mechanism formed integral with the mounting member for releasably maintaining the relative orientation of the supporting shaft and the axial mounting member during utilization.

Abstract: A tube cutter tool is insertable into a tube for cutting a coupon from a damaged site on the exterior of the tube. Prior to using the tool, the damaged site is first located from the interior of the tube using a multi-coil pancake eddy current test probe. The damaged site is then marked. A fiber optic probe is used to monitor the subsequent cutting procedure which is performed using a hole saw mounted on the tube cutter tool. Prior to completion of the cutting procedure, a drill in the center of the hole saw is drilled into the coupon to hold it in place.

Abstract: A double arbor has a shaft with a slideable first arbor at one end and a fixed second arbor at the other. A first hole saw of the already-cut, incorrect diameter is mounted on the first arbor. A second hole saw which is the size of the desired diameter hole is mounted on the second arbor. The assembly is attached to a drill or other rotating driving means and the first hole saw is placed into the existing opening where it acts as a pilot bit for the second hole saw. Use of the first hole saw as a pilot can also be applied to rabbeting, bevelling, grooving or sanding the existing hole by attaching different blades in place of the second hole saw.

Abstract: This disclosure relates to a hole cutter comprising a spindle having a rearward end shaped to be engaged and rotated by a drive machine, the spindle further having a front end and an axial center bore. A cylindrical blade is attached to the front end of the spindle. A centering pin is supported in telescopic relation within the center bore of the spindle, the pin engaging with the spindle to limit the forward movement of the pin relative to the spindle. A spring is supported in the center bore and urges the pin forwardly relative to the spindle to normally project a portion of the pin forwardly from the spindle and the blade. A center drill is attached to the front end of the spindle and projects forwardly from the blade, the drill having an axial center bore which receives the projected portion of the pin. The drill further has a bit attached to its front end.

Abstract: Quick-release arbor for hole saws has a generally cylindrical shaft with a threaded end portion for a screw-fitted connection to the threaded bore of a hole saw. A collar is disposed about the shaft, includes a shank, at one end, adapted for connection to a power driven chuck and, at its other end, a pair of diametrically spaced-apart drive-pins. The collar and shaft are characterized, respectively, by inner and outer diameters which provide a clearance therebetween so that the collar and the shaft are both axially movable and rotatable relative to each other. A retainer carried by the collar and another retainer carrier by the shaft for interengagement with the one retainer.

Abstract: A sealed, quick-disconnect, hole-saw arbor is disclosed for affixing a hole saw to a drill. The arbor enables a standard hole saw to be firmly "snugged up" to a shoulder on the arbor, and then rotated without being "backed off" the shoulder, in order to align drive holes in the hole saw with adjustable drive bosses on the arbor. In the preferred embodiments, the sealed hole-saw arbor produces a gravity-responsive, reversible, one-way lock effect on a threaded mounting sleeve. Letter indicators "T" and "L" on the arbor help the user position the arbor in a tighten or loosen position. Holding the arbor so that the "T" is upright, positions the arbor in the tighten position. The mounting sleeve is thereby secured against movement in a tighten direction and the hole saw is then threaded onto the sleeve and "snugged up" to the shoulder on the sleeve.

Abstract: A surgical bone reamer includes a rotatable, elongated shank having a proximal end, a distal end and a longitudinal axis, and a reaming head mounted on the distal end. A plurality of equally spaced walls are radially disposed on the reaming head around the longitudinal axis, and tip edges for penetrating bone are defined on the radial walls to be disposed angularly with the longitudinal axis. Reaming edges joined to the tip edges extend longitudinally from the tip edges in the proximal direction parallel to and an equal radial distance from the longitudinal axis for reaming a cylindrical tunnel when the reaming head is rotated in bone. Tapered flutes disposed angularly between the tip edges and the radial walls permit bone to be evacuated through the reaming head when forming a tunnel in bone.

Abstract: A threaded insert for drywall with a structure comprises a cylindrical body which includes an axial entrance hole at one end, an axial cavity at the other end, a high auger disposed thereon, a low thread disposed between the auger, a pair of drilling bits, diametrically opposed to each other, attaching to the bottom periphery of the axial cavity and extending therefrom to terminate a separately attached drilling tip. Extending from the entrance hole through the cavity, the body includes an internal passage for the insertion of a threaded fastener and facilitating the expelling of dusts. The drilling tip are separable upon the advancement of the fastener driven through the internal passage. The low thread strengthens pull-out resistance while the insert installed in the wall.

Abstract: Quick-release arbor for hole saws has a generally cylindrical shaft with a threaded end portion for a screw-fitted connection to the threaded bore of a hole saw. A collar is disposed about the shaft, includes a shank, at one end, adapted for connection to a power driven chuck and, at its other end, a pair of diametrically spaced-apart drive-pins. The collar and shaft are characterized, respectively, by inner and outer diameters which provide a clearance therebetween so that the collar and the shaft are both axially movable and rotatable relative to each other. A retainer carried by the collar and another retainer carried by the shaft for interengagement with the one retainer.

Abstract: A hole saw arbor assembly connectable to a source of torque comprises an arbor having a first end and a second end. A power tool mount is disposed on the first end, and threads are disposed on the second end of a construction capable of mounting a hole saw thereon. A collar mount area is disposed on the arbor proximate to the second end, and a collar retraction area is disposed on the arbor proximate to the first end. A drive collar has a central bore therein, and the arbor is disposed through the central bore. The drive collar is capable of translation between the collar mount area and the collar retraction area, is rotatable about the collar retraction area independent of the arbor, and is incapable of rotation about the collar mount area independent of the arbor. Means for retaining the drive collar about the collar retraction area is disposed on the arbor. The drive collar has drive pins associated therewith, and the drive pins are insertable into apertures in the hole saw.

Abstract: A hole saw and drive includes a cup-shaped saw body having a closed end and a plurality of cutting teeth. A left-hand threaded collar is secured to the closed end and defines one or more drive tabs extending into the saw body interior. A left-hand threaded mandrel is received within the threaded collar and includes a pilot drill and intermediate outwardly extending flange. An additional set of one or more drive tabs extend upwardly toward the threaded collar from the flange. The drive tabs cooperate to couple rotational power from the mandrel to the saw body. The left-hand threads on the mandrel and collar cooperate to permit the reverse rotational operation of the mandrel to expel a cutting plug from the saw body interior.

Abstract: In one embodiment, the bodies of the mandrel and the drill have radially opposing portions thereof which are threadedly engaged about the axis of the drill. Through bores in the respective body portions make it possible to latch the drill to the mandrel for the drilling operation, using a pin that is inserted through the bores, and then when the drilling operation is completed, withdrawn from the bores to enable the core of work material to be ejected from the drill by advancing the mandrel on the threading while the drill is restrained against rotation. In other embodiments, the bodies of the mandrel and the drill have axially opposing portions thereof which are equipped with raised steps on the axially opposing faces thereof. The steps enable the drill to be latched to the mandrel for the drilling operation by engaging the faces of the body portions with one another so that the steps abut in one axial plane of the drill.

Abstract: A rotary cutting devbice for cutting holes in a workpiece and a method of making a rotary cutting device. The method includes machining a notch across a face of a generally cylindrical body. The body has a longitudinally extending central axis and a central bore formed concentric therewith. Machining the notch forms at least one generally arcuate protrusion on a face of the body. A slot is formed through each of the protrusions resulting in two teeth being formed on either side of the mouth of the slots. A cutting tooth and a stabilizing tooth is formed on each side of the mouth of each slot formed in the body. The cutting tooth removes material from the workpiece and the stabilizing tooth limits the feed rate and prevents grabbing when a rotary motion is applied thereto.

Abstract: A shank structure for holding an annular hole cutter used for drilling a large circular hole, comprising a hollow cylindrical body, a center drill inserted in the inner cavity of the body and clutch means for inhibiting and allowing relative motion between the body and the center drill. In normal or initial state, the body and the center drill are inhibited from their relative motion by the clutch means and, in drilling operation, a central guide hole is first drilled by the center drill. When the guide hole reaches a suitable depth, the clutch means is actuated to allow the relative motion between the body and the center drill and the center drill stops drilling and sinks into the inner cavity of the body. Then, the annular hole cutter secured to the body starts to drill a main hole and, upon completion of the main hole, the center drill is pushed out from the inner cavity by spring action and, at the same time, discharges a disc-shaped chip formed within the annular hole cutter.

Abstract: A one piece hole saw assembly with mandrel permanently affixed to the hole saw cup. The mandrel contains a hollow shaft, a locking flange and reinforcing flange which are integrally formed as by machining. The locking flange of the mandrel mates with a locking hole or slot in the top surface of the hole saw cup. The reinforcing flange on the mandrel is welded during manufacture to the top surface of the hole saw cup. A pilot drill bit is inserted into the shaft core and welded to the shaft. The resulting product is a one piece hole saw assembly intended for use by simple insertion of the mandrel or shaft end of the pilot drill into the chuck of a conventional electric drill.

Abstract: A metal cutting tool is disclosed which includes a cylindrical cutting body (12) having an outer cylindrical surface (13) approximating the size of the hole desired and an inner wall (14) which tapers towards a base (15). The cutter body further includes a notch (17) for removal of cutting chips which has a socket disposed on the leading edge thereof. A carbide cutting tip (26) is disposed in the socket with the cutting tip being substantially pyramidically shaped, having a blunt cutting edge (35) extending above the cutter body. The metal cutting tool further includes a pilot bit (36) extending axially through the center of the cutter body, with the pilot including a short fluted (37) section which extends above the top of the cutting tip and provides a pilot hole for guiding the cutting tip during hole cutting.

Abstract: A plastic closet flange reboring tool having an elongated arbor, a cutting member and two exchangeable non-circular guide members. The arbor having a first end structured of a D-shaped threaded extension, and a second end structured for releasable connection to a rotatable tool chuck. The cutting member is generally concavo-convex in structure with the guide member being generally rectangular and flat with rounded terminal ends. Both the cutting member and guide member have central D-shaped apertures sized for receiving the D-shaped threaded extension of the arbor. Both the cutting member and guide member are releasably adjustably retained on the D-shaped threaded extension of the arbor with threaded nuts.

Abstract: A gap for allowing the cutting chips to escape is formed between the hole saw side wall and the workpiece in order to enhance the piercing efficiency. This hole saw comprises a drill part for determining the center of piercing with respect to the workpiece, a tubular part possessing plural piercing knives at the end surrounding the circumference of the drill part, and a shank part for fixing the drill part and the rear part of the tubular part and transmitting the torque from a power unit to the both, whereby at least the piercing knife disposition positions of the tubular part possess portions sequentially different in the distance from the rotary shaft.

Abstract: A sheet metal drill bit for drilling burrless round holes in thin products. The drill bit is formed by a solid drill body having a drill head and a connecting shaft. The drill head has two diagonally opposed outer cutting edges in a front face thereof each defining a flute geometry. A stabilizing central drill bit extends from the front face and beyond the outer cutting edge. The cutting edge has an elevated leading edge portion and a downward sloping trailing portion. A concave well is defined between the outer cutting edge and the central drill bit. The trailing portion tapers to at least the front face from which the central drill bit extends and to an angulated web portion. The concave well retains undrilled product pieces about the central drill bit whereas the web portion permits evacuation of loose drilled material.

Abstract: A device is disclosed for driving conventional hole saws and for extruding sawed material from within said saws after sawing. An internally right hand threaded shank is attached to the outer base end of a conventional hole saw. A cooperating mandrel is threaded into the shank from within the hole saw. The end of the mandrel remaining in the hole saw forms wing-like projections which spiral into the hole saw as the mandrel is threaded into the shank. A sleeve freely mounted on the shank contains pins which protrude into the saw through complimentary holes provided in the base of the conventional hole saw to obstruct the spiral motion of the mandrel projections to transfer torque from the mandrel to the saw for sawing, and the sleeve is moved away from the hole saw on the shank, withdrawing the pins from within the saw to free the mandrel to thread out through the saw to extrude sawed contents therefrom.

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 tenon forming tool which is an attachment for a powered hand drill.

Abstract: A tool is provided for drilling a hole in a construction material precisely concentric to a nearly inaccessible reference aperture situated opposite the side of the construction material from which the hole must be cut. A typical application is in cutting a sprinkler head receiving hole concentric with the open end of a downwardly directed drop of a sprinkler distribution system. The tool includes an elongated rod which carries a sliding guide member constrained between a stop positioned at one end of the rod and a compression spring urging the guide member toward the stop. Intermediate the length of the rod, there is provided a hole saw retaining shoulder against which a conventional hole saw of the desired diameter cut to receive a sprinkler head may be affixed with its teeth directed toward the rod first end.