Abstract: The self feeding drill bit comprises a shank that has one end adapted to be connected to a chuck of a rotary tool. The opposite end of the shank supports a cutting head having a series of teeth formed on the edge thereof for cutting the periphery of the hole. A screw tip may be provided for feeding the bit into and through the wood. A plurality of cutting blades is provided for boring the interior of the hole. The cutting blades define a plurality of cutting edges that are disposed at different angles to a plane perpendicular to the axis of rotation.

Abstract: A drill plug ejection system includes a drill and a drill bit coupled to the drill. The drill rotates the drill bit. A hole saw is mounted on the drill bit and includes a base wall and a perimeter wall that is attached to and extends away from the base wall. The perimeter wall has an terminal edge defining an opening into the hole saw. The terminal edge comprises saw teeth for cutting into material and removing a plug from the material. A plate has a first side, a second side and a peripheral edge. The plate has an aperture therein extending into the first side and outwardly of second side. The drill bit extends through the aperture and the second side faces the opening of the hole saw. A pair of biasing members is mounted on the plate and bias the plug outwardly of the hole saw.

Abstract: A hole saw has an arbor and a cup shaped cutting member. The cup shaped cutting member has an annular skirt with a plurality of teeth at its free end. A drill bit is secured on the arbor. The drill bit includes a pilot point with a first cutting edge. A second edge is formed on the body portion of the drill bit to form a constant diameter hole in the workpiece.

Abstract: The present invention describes electroformed thin-wall nickel core drills that are impregnated with diamond abrasives. The thin-wall core drills are formed with a plurality of raised portions and an equal plurality of recessed portions, with each raised portion alternating with a recessed portion, the raised and recessed portions are substantially parallel and are connected by transition portions. In another embodiment, some of the transition regions are formed with intermediate steps or partially raised and recessed portions. These intermediate steps or partially raised or recessed portions allow more uniform distribution of matrix material across a kerf width D1 as the core drill is spun, thereby, giving the cut edge a substantially square profile.

Abstract: To provide a user-friendly core drill which, when forming a large-diameter cut hole by the core drill with respect to an object to be drilled, such as concrete, is able to easily form, for example, a chamfered portion or a countersunk portion with respect to an opening end portion of the cut hole. In a core drill comprising a base body (1) including a shank (5) and a drill core body (2) including a drill cutting blade (13), a connection opening portion (11) of the drill core body (2) being attached to the base body (1), the connection opening portion (11) of the drill core body (2) is provided with a concave portion forming member (3) including a large-diameter hole cutting blade (15), and the large-diameter hole cutting blade (15) is provided outside the drill cutting blade (13) in a radial direction of the connection opening portion (11).

Abstract: A circular cutter is provided for use in cutting a hole through a main pipe wall from within a branch pipe, the circular cutter including a shaft rotated about a rotational axis, a circular cutter having at an outer end cutting teeth and an inner end secured to the shaft, and at least one centering ring secured to the circular cutter external cylindrical surface and of external diameter greater than the circular cutter external cylindrical surface and less than the internal diameter of the branch pipe, the centering ring serving to centrally position the circular cutter as it is rotated within the branch pipe and also serving to provide a positive stop to axial advancement of the circular cutter after it has cut through the main pipe wall.

Abstract: A hole saw includes a shaft, a hole-cutter and an adjustable outer cutter unit. The shaft has a bottom coupling hole for receiving a pilot drill, a top coupling rod for fastening to a driving tool, and an outer thread extending around the periphery thereof. The hole-cutter has a top center inner thread threaded onto the outer thread of the shaft. The adjustable outer cutter unit has two locating rods perpendicularly affixed to the shaft at two sides in a line and two cutters respectively movably mounted on the locating rods, locked thereto with a respective lock screw and abutted against an outer periphery of said hole-cutter.

Abstract: A one-piece drilling head (4), which is securable, in a material-locking manner, on an axial end of a helical shaft of a drill, is formed of a hard material and has four radially extending, in a cross-shaped manner, legs (5) forming respective cutting edges (6), and a tangential reinforcement (7) provided at a radially outer rim of each leg (5) in an axial region of a cutting edge (6).

Abstract: A system is disclosed to use a first rotary milling head to break or cut the bond of a heat transfer fin base to a boiler tube, thereby removing the heat transfer fins from the boiler tube, and a second rotary milling head to bevel the exposed end of the boiler tube, thereby facilitating the more efficient repair of the boiler tube.

Abstract: A hole saw includes a shaft, a hole-cutter and an adjustable outer cutter unit. The shaft has a bottom coupling hole for receiving a pilot drill, a top coupling rod for fastening to a driving tool, and an outer thread extending around the periphery thereof. The hole-cutter has a top center inner thread threaded onto the outer thread of the shaft. The adjustable outer cutter unit has two locating rods perpendicularly affixed to the shaft at two sides in a line and two cutters respectively movably mounted on the locating rods, locked thereto with a respective lock screw and abutted against an outer periphery of said hole-cutter.

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: A coring bit provides easy core removal by utilizing a series of lateral blades which extend from the top cutting surface to the base of the bit. The lateral blades and inner faces of the coring bit are biased to provide a conical shape to the core thus permitting the core to be easily extracted. Vents positioned approximate the lateral blades allow chips, debris and waste to be quickly dispelled. Various types of small center drill bits aid in the initial coring stages.

Abstract: A core bit for abrasive cutting including a cylindrical tube (3) provided at its end surface with cutting or abrasive bodies (2) and a cover (4) provided at an opposite end surface of the cylindrical tube (3) and secured thereto and having, along its central axis (A), a shank (5) to be received in a rotary power tool, with the cover (4) being dimensioned, with respect to a set excitation frequency, for forming a whole number of maximum amplitude oscillations of a concentric flexural oscillation, and the cylindrical tube (3) being dimensioned, with respect to a set excitation frequency, for forming a whole number of maximum amplitude oscillations of axial longitudinal oscillations.

Abstract: A sheet metal hole cutter has a cap plate defining a substantially circular peripheral groove and an annular shelf extending radially outwardly from the peripheral groove. An elongated band forming an approximately circular shape with opposite ends of the band contacting each other defines a base edge received within the circular peripheral groove in an abutting relationship with an inner edge of the groove. The band defines an axial depth of about ½ of an inch or less, and an outer diameter within the range of about 9/16 of an inch through about 6 inches. A weld region fixedly secures the base edge of the band to the cap plate. The annular shelf of the cap plate extends radially outwardly from the base edge of the band and defines a radial depth of at least approximately 1/16 of an inch in order to prevent over-feeding of the hole cutter through a work piece.

Abstract: A tool assembly comprising a cylindrical hole saw having an annular cutting surface and at least one rebate blade positioned adjacent to the exterior sidewall of the hole saw having a cutting surface in a plane approximately parallel with the cutting surface of the hole saw and the rebate blade located a predetermined distance below the cutting surface of the cylindrical hole saw.

Abstract: The present invention is directed to a coring drill and method for preparing a block for containing a receptacle assembly. The coring drill comprises a generally cylindrically-shaped corer hub having a longitudinal drilling axis. A generally cylindrically-shaped first corer has a first-corer axis coaxial with the longitudinal drilling axis and a first coring end having a first-coring diameter. The first-corer is removably attachable to the corer hub. A generally cylindrical-shaped second corer has an second-corer axis coaxial with the longitudinal drilling axis and a second coring end having a second coring diameter greater than the first coring diameter. The second-corer is attached to the corer hub. A generally cylindrical-shaped counter-borer has a counter-borer axis coaxial with the longitudinal drilling axis and a counter-boring end having a third coring diameter greater than the second coring diameter. The counter-borer is attached to the corer hub.

Abstract: A hole saw for cutting standardized holes in the web portion of an I-joist features a light weight three spoke body having a rim with continuous circumference and three inserted cutting blades fixed in an offset to the circumference, which is dimensioned in accordance to standard web heights.

Abstract: A hole saw having efficient slug removal includes a saw cup, a shank portion, and a location drill. A plurality of cutting teeth are formed on an open end of the saw cup and the shank portion is attached to the other end of the saw cup. The location drill is retained in the shank portion. At least two inward cutting teeth are formed on an inside surface of the saw cup. The at least two inward cutting teeth may be two existing cutting teeth bent/formed inward, or at least two inward cutting teeth formed on an inside surface of the saw cup. The location drill is preferably modified such that the cutting diameter has a short length and the remainder of the length is relieved. A compression spring may be added to the hole saw to eject a slug.

Abstract: A hole saw having a cylindrical shape includes a plurality of repetitive groups of saw teeth. The repetitive groups include a first inboard set tooth and a first outboard set tooth. The inboard set tooth is displaced a distance greater than the outboard set tooth. Each repetitive group further includes taller straight teeth. The set teeth have a smaller back angle and a longer shoulder than the straight teeth.

Abstract: A pilot tool assembly for a core drill comprises a pilot tool unit that fits within the core drill and expandable means engagable with the interior surface of the core drill for releasably locking the pilot tool unit to the core drill, the pilot tool assembly being removable from the core drill by application of an axial force to the pilot tool unit. The pilot tool unit comprises a pilot tool that projects from the front end of the core drill and serves as a centering aid for the core drill. The pilot tool may be inserted into a predrilled pilot hole whereby to keep the core drill centered on a desired location. The pilot tool may be a small diameter drill that is used to drill the pilot hole.

Abstract: A reaming device for reaming a pipe, which may have electrical wires passed therethrough, is attachable to a power tool, has at least one reaming blade thereon, and is adapted to receive at least one driving bit.

Abstract: A pilot tool assembly for a core drill comprises a pilot tool unit that fits within the core drill and expandable means engagable with the interior surface of the core drill for releasably locking the pilot tool unit to the core drill, the pilot tool assembly being removable from the core drill by application of an axial force to the pilot tool unit. The pilot tool unit comprises a pilot tool that projects from the front end of the core drill and serves as a centering aid for the core drill. The pilot tool may be inserted into a predrilled pilot hole whereby to keep the core drill centered on a desired location. The pilot tool may be a small diameter drill that is used to drill the pilot hole.

Abstract: A hole saw having a cylindrical shape includes a plurality of repetitive groups of saw teeth. The repetitive groups include a first inboard set tooth and a first outboard set tooth. The inboard set tooth is displaced a distance greater than the outboard set tooth. Each repetitive group further includes taller straight teeth. The set teeth have a smaller back angle and a longer shoulder than the straight teeth.

Abstract: A tool assembly for creating an opening in a hollow core structure that includes a cylindrical hole saw having an annular cutting surface and at least one rebate blade positioned adjacent to the exterior sidewall of the hole saw and having a cutting surface in a plane approximately parallel with the cutting surface of the hole saw. The rebate blade is located a predetermined distance below the cutting surface of the cylindrical hole saw. The assembly is powered by a conventional hand drill.

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 connection device is, designed to connect a boring saw to a rotating tool and is formed of a shaft, a locating member, a sleeve, and a nut. The shaft is provided with a shaft hole to receive a bit, and a connection portion for fastening the shaft with the rotating tool, a first outer threaded portion which is engaged with the nut, and a second outer threaded portion which is engaged with the inner threaded portion of the rotating body of the boring saw. The shaft is fitted into the sleeve which is urged by the nut to press against the rotating body to be fastened securely with the rotating tool.

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: The present invention is a low profile self-adhering drill having a feed mechanism having an axis of rotation, which is generally perpendicular to the axis of rotation of the drill motor. The feed mechanism includes a quill housing which houses a quill. A spindle is disposed within the quill for holding the tool. The spindle is in engagement with the quill and rotates about the travel axis of the quill relative to the quill and is moveable along the axis with the quill. A rack on the quill is parallel to the travel axis and engages a feed gear such than when the feed gear is rotated the rack and quill move along the travel axis.

Abstract: A tool and method for cutting a circular opening and retaining the cut portion. The tool comprises a shaft having at least one cutting thread and at least one tapping thread, or at least one cutting thread and at least one male screw thread, or only at least one tapping thread, or only at least one male screw thread, or a cutting tip and at least one tapping thread, or a cutting tip and at least one male screw thread, and a cutting member having at least one cutting bit radially displaced from the shaft. The shaft and the cutting member have a mutual rotational axis. An alternative tool has a spaced distance on the shaft between the cutting member and the at least one cutting thread and at least one tapping thread, or the at least one cutting thread and at least one male screw thread, or the at least one tapping thread, or the at least one male screw thread, or the cutting tip and at least one tapping thread, or the cutting tip and at least one male screw thread.

Abstract: A diamond coated drill capable of drilling large holes in composite materials and then reaming the holes to their correct size includes a pair of prongs extending from a shank. Each of the prongs has a tip, a grinder, and a reamer. The tips initiate a hole, the grinders gradually grind the hole to the proper size, and the reamers control the final diameter of the hole. The tips have a coarse grit diamond coating. The grinders also have a coarse grit diamond coating and are axially tapered toward the tips. The reamers have a fine grit diamond coating and are disposed axially above the grinders and the shank of the drill. The grinders apply a radial load to the composite material resulting in no fiber breakout or splintering. The composite material drilled by the drill naturally falls out of the drill during drilling.

Abstract: A saw blade comprising a basic body (8) lying in a longitudinal center plane (9) and having an edge and including along its edge a group (6) of recurring teeth (1, 2, 3, . . . ), the group (6) comprising at least one unset leading tooth (1) being provided with a phase and having an effective cutting-edge section (10) and a preferably even number of trailing teeth (2, 3, . . . ). The leading tooth (1) has a larger height than all of the trailing teeth (2, 3, . . . ). All of the trailing teeth (2, 3, . . . ) have different plastic deformations at their tips (28) by displacements of material in the running direction (24) of the saw blade. Each of the trailing teeth (2, 3, . . . ) have both a positive enlarged rake angle (gamma.sub.2, gamma.sub.3, . . . ) and a reduced height (h.sub.2, h.sub.3, . . . ) with respect to the leading tooth (1) produced by different plastic deformations.

Abstract: A trepanning tool for making holes having a plurality of tool insert holders with pockets wherein replaceable carbide tool inserts are secured by retaining screws, the inserts being positioned so that alternate tool inserts cut overlapping inner and outer portions of a leading surface. Spiral chip relief grooves are provided on the exterior of the trepanning tool to receive cuttings made by each tool insert and remove cuttings from the hole. A tool insert which is positioned to cut the inner portion of the leading surface may be angled to direct cuttings outwardly, toward an adjacent chip relief groove. The flanks of the tool insert holders are cut back to allow access to the retaining screw in the adjacent tool insert holder for tool insert replacement.

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 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 drilling tool, in particular for rotary percussion drilling preferably of rock, is proposed, with a drill body preferably equipped with cutting tips toward the drilling side and with an axially arranged bore for receiving an exchangeable center drill. In order to carry out easy mounting and demounting of the center drill, the drilling tool is designed in two parts, the center drill being capable of being introduced into the drilling tool on the clamping side.

Abstract: A cutter for use in fabricating dowels, plugs, or tenons has a hex-shaped shank and a body portion. The body portion includes a spur which may be carbide and is the first part of the cutter to contact the wood and which makes an initial depression into the wood. A cutting tooth has a cutting edge that may also be carbide for cutting a trough into the wood and is the widest part of the cutter. The exterior surfaces of the cutter above the cutting tooth are formed at smaller radial distances and consequently have less, if not no, contact with the piece of wood being cut. The cutting tooth may be tapered along its height whereby the bottom of the tooth would be the thickest part of the tooth and would have the most contact with the wood. Also, the portion of the cutter trailing the spur may be formed with teeth and flutes thereby reducing the amount of contact between the cutter and the wood.

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: A wood coring drill bit comprising a hollow tube having an internal bore (103) and an exterior (100) with equally spaced bodies (10) of substantially uniform width extending in a helical manner from a cutting end (10) of said drill bit, said bodies (10) defining equally spaced flutes (15) between the edges of adjacent bodies (10), each body (10) comprising a land (20) upstanding from a relief (21) at the leading edge of the body (10), a respective cutting face (12) and associated lip (25) being formed at the end of each body (10) at said cutting end. The wood coring drill bit is characterized by having three equally spaced bodies (10) and flutes (15) said cutting face (12) has an included angle which is preferably 125.degree. for hardwood and drywood and 112.degree. for softwood. The lip (25) has a lip clearance angle that is about 6.degree..+-.1.degree. , the lands (20) on the bodies (10) extend for an axial distance of about 65 mm.+-.

Abstract: A hole-cutting device for attachment to a portable electric drill or similar rotating machine. The device has a cylindrical body with a rearward edge and a forward edge; a mounting plate is affixed across the rearward edge, and a series of chipper teeth are affixed about the forward edge. Each chipper tooth has a transverse cutting edge and a second cutting edge in substantial alignment with the wall of the cylinder, but alternate chipper teeth have second cutting edges displaced inwardly and outwardly from the cylindrical member.

Abstract: The present invention discloses an annular hole cutter particularly useful for cutting railroad rails. Railroad rails are extremely hard and normally require drills or cutters which have carbide inserts. The present invention provides uniquely designed cutter with an improved cutter geometry, flute design and thin wall construction to allow the annular cutter to be used with a lower horsepower drill motor making the drill motor portable resulting in a portable rail cutting system.

Abstract: An annular bit (1) having an attachable center drill (6) is proposed, in which annular bit (1), on the one hand, reliable holding of the center drill (6) in the annular bit (1) is ensured and, in particular, distributions of the cutting segments (3) on the annular bit (1) differing from the 90.degree. symmetry are made possible. This is achieved according to the invention in that the center-drill holder (4) has at least one push-in pin (11) and the wall of the annular bit (1) has at least one recess (14, 15, 16) for accommodating the push-in pin (11), which pin and recess are formed in such a way that the push-in pin (11) is retained in the recess (14, 15, 16) in the axial direction relative to the annular-bit axis in the locked state of the center-drill holder (4).

Abstract: A cutter for use in fabricating dowels, plugs, or tenons has a hex-shaped shank and a body portion. The body portion includes a spur which is the first part of the cutter to contact the wood and which makes an initial depression into the wood. A cutting tooth has a cutting edge for cutting a trough into the wood and is the widest part of the cutter. The exterior surfaces of the cutter above the cutting tooth are formed at smaller radial distances and consequently have less, if not no, contact with the piece of wood being cut. The cutting tooth may be tapered along its height whereby the bottom of the tooth would be the thickest part of the tooth and would have the most contact with the wood. Also, the portion of the cutter trailing the spur may be formed with teeth and flutes thereby reducing the amount of contact between the cutter and the wood. By reducing the amount of contact between the wood and the cutter, the cutter has a reduced amount of friction with the wood.

Abstract: A plug cutter has a main body portion having a longitudinal axis, shank portion extending axially from one end of the main body, and a plurality of blades extending axially from an opposite end of the main body. The blades are formed so that at least a portion of the inner surfaces thereof have a measure of radial relief with respect to the leading edges of the blades. A radial distance from the axis of rotation of the plug cutter to the leading edge of each blade is always less than the radial distance from the axis of rotation to any other portion of the inner surface. Accordingly, when a plug is being cut with the plug cutter, a gap is defined between an outer surface of the plug and the radially relieved portion of the inner surfaces.

Abstract: An improved hole saw for cutting holes having a cylindrical shape that includes, along its cutting edge, a plurality of repetitive groups of saw teeth having at least four radially displaced trailing teeth. The displacement of each trailing tooth is such that it has a substantially greater displacement than for any other tooth of said group preceding said trailing tooth. The displacement of each tooth being such that the cutting edge thereof is characterized as being movable along a cutting path different from the cutting paths of the other teeth of the group as the hole saw is rotated whereby each tooth cuts chips of uniform size. Each group of teeth may include a raker tooth having no substantial displacement with respect to the side surfaces of the hole saw. The raker tooth may be the same height or of greater height than the trailing teeth.

Abstract: A hole saw comprises a cup with two cutting teeth positioned on the open end of the cup. The two cutting teeth are substantially diametrically opposed to one another to provide a balanced cutting engagement of the media and are spaced apart by a chord length of between about 45 to about 180 degrees. A pair of secondary gullets are positioned in the cup proximate to a forward cutting edge of the two cutting teeth. The secondary gullets have a predetermined depth and shape along a longitudinal axis of the cup to suitably remove debris from the cup during a portion of the duration of the hole cut. A plurality of raker teeth may be positioned on the chords defining the spacing between the cutting teeth. The raker teeth are disposed below the cutting teeth, approximately 0.030 inches to engage and move cutting debris formed by the cutting teeth.

Abstract: A rotary tool for forming a blind-tapered hole in a workpiece includes an elongate shaft having a bit shank on one end and a base plate secured to the other end. A collar, mounted for axial movement on the shaft, is biased away from the base plate to a first position on the shaft by a return spring. At least two cutting blades are pivotally attached to the collar. A portion of the length of each cutting blade is fixedly circumferentially and radially supported relative to the shaft by a blade guide that rotates with the shaft such that the angle formed between each cutting blade and the shaft's rotational axis increases with increasing axial displacement of the collar on the shaft away from the first position.

Abstract: A tool for cutting holes in metal provides a shank defining at one end an arbor releasably carrying a circularly annular cutter that defines teeth at each cutter end which may be sequentially used to extend cutter life without sharpening. The annular cutter defines a plurality of spirally arrayed, inwardly extending flutes and alternating outwardly extending lands on both inner and outer sides to provide cutting edges on both cutter sides at each end. The lands are formed with buttress type sides angulated ten to sixty degrees to a radius passing therethrough steeper spiral arrays of lands and grooves are arrayed in shallower spirals with an angle of up to seventy degrees to the axis of the cutter to allow thinner wall construction in my cutter than in prior cutters. The thinner cutter wall allows definition of more cutting teeth than would thicker walls and the cutter configuration allows definition of stronger, more efficient teeth without gullets.

Abstract: A spring loaded automatic plug ejector for hole saws which utilizes a spring 50 which is increasingly compressed while a hole is being drilled. Once the hole is drilled, the spring 50 decompresses and ejects the plug from the hole saw. The amount of spring tension applied to the plug is adjusted by varying the degree to which the spring is compressed.

Abstract: A drill bit includes a one-piece cylindrical drill bit tube having a longitudinal axis and defining cylindrical surfaces including an inner cylindrical surface and an outer cylindrical surface. At least one of the cylindrical surfaces is configured to include deformations comprising at least one of embossments and recesses, all of the deformations appear over an entire length of the tube. At least some of the deformations are finite over the at least one of the cylindrical surfaces, the deformations further being adapted to stiffen the tube in the longitudinal direction without additional material reinforcements being disposed on the tube. The drill bit further includes hard-metal cutting elements disposed on a front face of the tube.

Abstract: A hole producing assembly for a power drill including an adapter having one end operationally connected to the power drill such that the power drill rotates the adapter about an axis of rotation, the other end of the adapter includes a threaded shaft having threads that are of the four-start type, a cutter which has threads thereon that are complementary to the four-start threads on the adapter so that the cutter is threadably connectable to the adapter, the cutter has a cutting projection extending from the base and terminating in a cutting edge, and a spacer positioned between on the shaft of the adapter to aid in removal of the cutter from the adapter after use.