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 hole saw having efficient slug removal includes a saw cup, a shank portion, a spade bit, a compression spring and a contact disc. 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 with any suitable fastening process. The spade bit includes a cutting bit and a shank. A shank opening is formed through the shank portion to receive the shank of the spade bit. Preferably, a set screw or the like is used to retain the spade bit in the shank opening. The shank of the spade bit is inserted through the contact disc and then the compression spring, before insertion into the shank opening. A hole slug is ejected from the saw cup, when the hole saw is removed from a hole.

Abstract: A rotary hole punch (T) comprising a cylindrical head (10) with circular section, the free end (11) of which can be gripped by a means able to drive said hole punch rotationally, a cylindrical tube (20) of circular section, attached to the inner end (12) of the head (10), and ending in a cutting edge (21), characterized in that the head (10) of the hole punch includes at least one duct (13) making it possible to feed a fluid under pressure inside the tube (20) at the level of the inner end (12) of the head (10).

Abstract: A hole saw having a tubular cutting portion, a pilot drill bit, an ejection plate disposed within the tubular cutting portion and a compression spring cooperating with the plate further includes a guide structure fixed to the ejection plate and slidingly cooperating with a helical flute of the pilot drill bit. The compression spring and cooperating guide structure provide a combination of linear and rotational ejection of a waste plug from the hole saw. A duel set screw feature facilitates waste plug removal if needed and includes a first set screw frictionally engaged with a flat surface of the drill bit and a second set screw cooperating with a circular groove running about the drill bit.

Abstract: A hole saw includes a depth stop for limiting the depth of penetration of the hole saw into a workpiece. The blade of the hole saw includes a plurality of slots, one of which is used to receive the depth stop. The depth stop is mounted to the blade by positioning a portion of the depth stop within the slot and sliding the depth stop from an unsecured position to a secured position. Once in the secured position, a locking member is moved within the depth stop to secure the depth stop in place. In use, the blade is advanced through the workpiece until the depth stop contacts the proximal surface of the workpiece.

Abstract: A hole saw having efficient slug removal preferably includes a saw cup, a shank portion and a pilot cutting device. A cutting surface is formed on an open end of the saw cup. An inside surface of the saw cup is given a low friction treatment and preferably an outside surface thereof. The shank portion is retained on a closed end of the saw cup. The pilot cutting device is preferably a drill, but other cutting devices may also be used. A second embodiment of a hole saw having efficient slug removal preferably includes a saw cup, a shank portion and a pilot cutting device. The saw cup includes a prior art saw cup, at least two side openings and a cutting surface. The at least two side openings are formed through the prior art saw cup to remove a substantial portion of a side wall.

Abstract: A lock body in a locked state is inserted radially inward of an outer surface. A stopper body in a contact state holds the lock body in an unlocked state. The stopper body in a non-contact state is retracted from the lock body. A pressing body is switchable between a standby state and a retracted state. The pressing body in the standby state selectively contacts a central shaft when an insertion portion is inserted in a support cylinder. The pressing body in the retracted state is retracted from the stopper body. An urging member urges the pressing body into the standby state, and urges the stopper body into the contact state. The urging member detachably engages the pressing body to the stopper body. Thus, the structure of the cutter holder is simple.

Abstract: A cutting tool includes a tool body having a first end engageable with a workpiece and a second end engageable with a spindle of a power tool. The tool body includes first, second, and third gullets opening through a first end of the tool body and being spaced asymmetrically around a circumference of the first end. The cutting tool also includes a blade extending outwardly from the first end of the tool body adjacent to the first gullet.

Abstract: A electrical housing knockout device (4) having a bracket (5) with a horizontal side (7) perpendicularly secured to a vertical side (6) and a sleeve element (8) connected to the horizontal side (7). The sleeve element (8) includes a shaft (9) and a base (10) wherein a central opening (12) extends through the shaft (9) and base (10). The sleeve element (8) also includes a collar (11)located between the shaft (9) and base (10) wherein the collar (11) has an aperture (14). The sleeve element (8) extends from the collar (11) at a predetermined angle. The collar (11) is adjacent to the horizontal side (7) and is positioned such that the collar aperture (14) is pivotal about a stopper (15) which extends from the horizontal side (7). A means for securing the bracket (5) to the interior of a junction box (1) or circuit breaker box (26) is also included.

Abstract: The present invention relates to a hole-saw assembly (10) including a hole saw (26) having at one end a plurality of cutting teeth and at the other end two shafts. The assembly includes a mandrel (16) coaxially aligned with said hole-saw and including a body having two bores there through coaxially aligned with said shafts. An annulus (20) located on top of the body is coaxially aligned with said mandrel and hole saw and includes two holes, the annulus rotatable around its longitudinal axis from a first to a second position. In the first position the annulus holes are aligned with the bores and shafts allowing the shafts to be freely insertable and removable and in the second position the holes are misaligned to lock the shafts to the annulus. The mandrel further includes a pair of driving pins (22) adapted to engage driving apertures (24) found in hole saws especially larger ones.

Abstract: An arbor is provided for small diameter quick change and standard hole cutters. Each hole cutter defines an outer diameter of less than 1¼ inches, a central aperture and at least one drive pin recess. The arbor comprises an arbor body including an end portion engageable within the central aperture, and a drive member having at least one drive pin for engaging a corresponding drive pin recess of the hole cutter for rotatably driving the hole cutter.

Abstract: A core cutter comprises a cylindrical base, a plurality of cutting portions provided at a tip end of the base, discharge grooves configured to discharge chips cut by the cutting portions, and an attaching portion. Each of the cutting portions 2 includes a block and at least three cutting blades. A first cutting blade 2a may be located radially inward relative to the second and third cutting blades 2b and 2c and the second cutting blade 2c is located between the first and third cutting blades in a radial direction, and the cutting blades deviate rearward in a rotational direction. A wall 3b of the discharge groove 3 corresponds to a cutting surface 2k of the third cutting blade, and a gallet 4 is provided adjacent each cutting portion, the gallet formed by cutting an outer peripheral surface of a tip end portion.

Abstract: An arbor is provided for small diameter quick change and standard hole saws. Each hole saw defines an outer diameter of less than 1¼ inches, a central aperture and at least one drive pin recess. The arbor comprises an arbor body including an end portion engageable within the central aperture, and a drive member having at least one drive pin receivable in a corresponding drive pin recess of the hole saw for rotatably driving the hole saw.

Abstract: An arbor is provided for both quick change and standard hole saws. Each hole saw includes a central aperture and at least one drive pin aperture. The arbor comprises an arbor body including an end portion engageable within the central aperture, a drive shank opposite the end portion for engaging a power tool, and an axially extending pilot bit aperture for receiving either a quick change pilot bit or standard pilot bit. The arbor further comprises a drive pin plate having at least one drive pin receivable in a corresponding drive pin aperture of the hole saw for drivingly engaging the hole saw. The arbor further comprises a pilot bit mechanism having a first state for engaging a quick change pilot bit, a second state for engaging a standard pilot bit, and a third state for disengaging and releasing the inserted quick change or standard pilot bit from the arbor body.

Abstract: A hole saw includes an arbor, a saw blade assembly having a saw blade and an adapter connected with the saw blade and provided with a protrusion received in an indentation of the arbor, a lid movably mounted on a body portion of the arbor and movable relative to the arbor between a first position where second coupling portions of the adapter are blocked by a block portion of the lid and coupled to first coupling portions of the arbor such that the saw blade assembly can't be rotatable relative to the arbor, and a second position where the second coupling portions of the adapter are staggered with the block portion and uncoupled from the first coupling portions of the arbor through the rotation of the saw blade assembly. Thus, the hole saw has the advantages of reducing vibration in use and convenience in assembly and disassembly works.

Abstract: A bit (20) for a tool is provided. The bit includes a housing (22) having a cutting portion (24) and a shank (26). The bit also includes a post (40) disposed within the housing and positioned to assist in anchoring the bit to a workpiece (52) during use.

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: A hole saw holder comprising an elongate body having a first end and a second end, wherein the first end has an external thread (6) of sufficient length t receive a plurality of hole saws (16), a support formation (8) at the end of the external thread for supporting one or more hole saws received by the external thread, and a central axial drill bit receiving bore (4) which extends throughout the length of the elongate body. The hole saw holder can used to conveniently store a plurality of hole saws and a hole saw arbour. T hole saw holder can be used with two hole saws of different diameters to enlarge a hole which has already been drilled in a surface.

Abstract: A circular-shank tool including a shank held in a bore of a tool holder by a locking sleeve, the shank being rotatably held in the locking sleeve. The locking sleeve has one or more retaining elements that project inwards and engage in a peripheral groove in the shank of the tool, thus indisplaceably securing the locking sleeve in an axial direction on the shank of the tool. Because the locking sleeve is mirror-symmetrical to the central transversal plane, the locking sleeve can be fixed to the shank in a position that is rotated through 180°.

Abstract: An arbor assembly for connecting a cutting tool to a power tool includes a shaft defining a longitudinal axis and having an end portion configured to couple to the cutting tool, and a plate surrounding a portion of the shaft adjacent to the end portion. The plate has a first surface configured to engage the cutting tool when the cutting tool is coupled to the shaft and a second surface substantially opposite the first surface. The plate is movable along the longitudinal axis relative to the shaft. The arbor assembly also includes a wedge member positioned adjacent to the second surface of the plate and defining an opening to receive a portion of the shaft. The wedge member is movable relative to the plate from a first position, in which the plate is inhibited from moving along the longitudinal axis away from the end portion, to a second position, in which the plate is movable along the longitudinal axis away from the end portion.

Abstract: In a core bit formed with a drill portion in a cylindrical shape formed with a boring blade on one end side thereof and a mounting portion in a cylindrical shape mounted to a chuck portion of a concrete drill on other end side of the drill portion, formed with an engaging portion capable of being engaged with an engaging portion on a side of the chuck portion at an outer peripheral face of the mounting portion for transmitting rotation of a side of the concrete drill via the engaging member, the outer peripheral face of the mounting portion on a side of the boring blade of the engaging member is formed with a flange portion in a shape of a flange having a diameter larger than an outer diameter of the engaging member.

Abstract: A holesaw mandrel has a mandrel body with at least one bore, a pilot drill bit bore, and a first end coupled with the body. The first end is coupled with a driver. A second end extends from the body and includes a threaded spud. A sliding collar is axially movable on the mandrel body. The sliding collar includes at least one pin extending the bore in the mandrel body. A resilient member is positioned adjacent the threaded member to provide enhanced securement of the holesaw. The sliding collar is magnetized to prevent withdrawal of the pin from the holesaw. A positioning member is in the pilot drill bore to provide a desired orientation of the pilot drill bit.

Abstract: A cutter is for driven engagement with an arbor having one of an extending member and a pair of set screws. The cutter includes a shank portion having a central axis and a cutting portion extending from the shank portion along the central axis. A retaining recess is formed in the shank portion for selectively receiving the extending member of the arbor when the arbor is configured to have the driving device. A pair of flats are each formed in the shank portion for engaging the set screws when the arbor is configured to have the set screws. One of the flats extends in a first plane and the other of the flats extends in a second plane perpendicular to the first plane.

Abstract: A cutter is for driven engagement with a driving device of an arbor. The cutter includes a shank portion having a central axis and extends along the central axis between a first end and a second end. A cutting portion extends from the first end of the shank portion. The shank portion defines an entry channel extending from the second end for guiding the driving device of the arbor during insertion of the shank portion into the arbor. The shank portion also defines a retaining channel extending from the entry channel for selectively retaining the driving device of the arbor. Each of the entry and retaining channels have a trough portion extending toward the central axis. The trough portions of each of the entry and retaining channels have a common configuration for slideably receiving the driving device.

Abstract: A holesaw mandrel assembly has a mandrel with a first shanking end, a body, and a second extending end which includes a threaded spud to receive a holesaw. A first member is secured on the second end. The first member is axially slidable on the second end. The first member also includes a friction surface to contact the holesaw. The friction surface moves between a first contacting position and a second release position. A mechanism on the mandrel moves the friction surface between the first and second positions.

Abstract: A tool holder includes a shank including a tool holder portion and a central bore for accommodating a cutting tool, and a first shrink fit sleeve disposed about the tool holder portion of the shank. An application of heat to the tool holder causes the tool holder portion and the first shrink fit sleeve to expand outwardly, and the removal of heat will cause the tool holder portion and the first shrink fit sleeve to contract inwardly to rigidly maintain the cutting tool within the tool holder by shrink fit. The tool holder may also include a second shrink fit sleeve disposed about the first shrink fit sleeve to provide increased torque capability.

Abstract: An alignment device for hole saw includes a first alignment member having a first end having an outer width slightly less than an inner diameter of the hole saw and serves as an alignment bearing surface therefor and a second end configured with a nose to be received adjacent a hole of a work piece and a draw bar and tightening member therewith for drawing the first alignment member against the work piece in a manner wherein the nose is self centering within the hole and thereby maintaining the first alignment member in a predetermined aligned position with respect to the work piece.

Abstract: A holesaw mandrel has a mandrel body with at least one bore, a pilot drill bit bore, and a first end coupled with the body. The first end is coupled with a driver. A second end extends from the body and includes a threaded spud. A sliding collar is axially movable on the mandrel body. The sliding collar includes at least one pin extending the bore in the mandrel body. A resilient member is positioned adjacent the threaded member to provide enhanced securement of the holesaw. The sliding collar is magnetized to prevent withdrawal of the pin from the holesaw. A positioning member is in the pilot drill bore to provide a desired orientation of the pilot drill bit.

Abstract: There is provided a hole saw system comprising a hole saw including a bottom portion and a body portion; a mandrel, including apparatus for receiving the hole saw; wherein the hole saw includes a plurality of slot pairs, the slot pairs being offset from each other on the body portion allowing a tool to be inserted into one of the slot pairs for removal of a slug.

Abstract: An adjustable drill comprising a drill body having a longitudinal axis, comprising a face surface comprising an aperture extending into the drill body; a directional feature adjacent the aperture extending toward an edge of the drill body; a longitudinal gullet extending from the face surface along at least a portion of the drill body; a cartridge adjacent the face surface and selectively slidable along the directional feature comprising a slot along the directional feature; and a cutting face comprising an insert pocket positioned adjacent the edge of the drill body; a fastener through the slot into the aperture releasably affixing the cartridge to the drill body; and an insert releasably affixed in the insert pocket.

Abstract: A core cutter that enables debris generated by cutting from inside of the core cutter to be easily discharged therefrom is disclosed. A core cutter comprising a core body 4; cutting chips 1 arranged to be suitably spaced apart from each other in a circumferential direction thereof on a tip end of the core body 4 and a shank portion 2 provided at a base end of the core body 4; wherein a plurality of cutting chips 1A, 1B, and 1C arranged adjacent each other in the circumferential direction, which are included in the cutting chips 1 arranged to be suitably spaced apart from each other, protrude radially inward farther than cutting chips 1D, 1E, and 1F other than the plurality of cutting chips arranged adjacent each other.

Abstract: The present invention relates to a hole-saw assembly (10) including a hole saw (26) having at one end a plurality of cutting teeth and at the other end two shafts. The assembly includes a mandrel (16) coaxially aligned with said hole-saw and including a body having two bores there through coaxially aligned with said shafts. An annulus (20) located on top of the body is coaxially aligned with said mandrel and hole saw and includes two holes, the annulus rotatable around its longitudinal axis from a first to a second position. In the first position the annulus holes are aligned with the bores and shafts allowing the shafts to be freely insertable and removable and in the second position the holes are misaligned to lock the shafts to the annulus. The mandrel further includes a pair of driving pins (22) adapted to engage driving apertures (24) found in hole saws especially larger ones.

Abstract: The slug retrieval apparatus is used with a hole saw with chuck mechanism, after a pilot hole is drilled. The apparatus is fitted within the chuck mechanism and the hole saw then used to cut a hole in the workpiece. The shaft of the apparatus guides the hole saw cut, as would the shaft of a pilot bit. The springs within the slot of the shaft compress within the slot to allow the shaft to pass through the pilot hole drilled in the workpiece. The springs then expand to capture the shaft within the hole. When the slug is cut from the workpiece by the saw, the springs capture the slug until the user compresses the springs to remove the slug. The springs provide for expansion no matter the speed of the apparatus used to drive the hole saw.

Abstract: A holesaw mandrel assembly has a mandrel body with a first end to be coupled with a drill motor and a second end extending from the body. The second end receives a holesaw. The first member is positioned on the second end. The first member is axially movable on the second end. A friction surface is on the first member. The friction surface is adapted to contact a base surface of the holesaw such that upon contact with the friction surface, the holesaw is fixed in position. The friction surface moves between a first contact position and a second release position. A mechanism on the first member moves the friction surface between the first and second position.

Abstract: A holesaw mandrel assembly has a mandrel body with a first end to be coupled with a drill motor and a second end extending from the body. The second end receives a holesaw. A housing covers a portion of the mandrel. A first member is coupled with the housing and moves between a first and second position. A friction surface is on the first member. The friction surface is adapted to contact the holesaw such that upon contact with the friction surface, the holesaw is fixed in position. The friction surface moves between a first contact position and a second release position. A mechanism coupled with the housing moves the friction face between the first and second positions.

Abstract: A electrical housing knockout device (4) having a bracket (5) with a horizontal side (7) perpendicularly secured to a vertical side (6) and a sleeve element (8) connected to the horizontal side (7). The sleeve element (8) includes a shaft (9) and a base (10) wherein a central opening (12) extends through the shaft (9) and base (10). The sleeve element (8) also includes a collar (11)located between the shaft (9) and base (10) wherein the collar (11) has an aperture (14). The sleeve element (8) extends from the collar (11) at a predetermined angle. The collar (11) is adjacent to the horizontal side (7) and is positioned such that the collar aperture (14) is pivotal about a stopper (15) which extends from the horizontal side (7). A means for securing the bracket (5) to the interior of a junction box (1) or circuit breaker box (26) is also included.

Abstract: A hole saw includes a depth stop for limiting the depth of penetration of the hole saw into a workpiece. The blade of the hole saw includes a plurality of slots, one of which is used to receive the depth stop. The depth stop is mounted to the blade by positioning a portion of the depth stop within the slot and sliding the depth stop from an unsecured position to a secured position. Once in the secured position, a locking member is moved within the depth stop to secure the depth stop in place. In use, the blade is advanced through the workpiece until the depth stop contacts the proximal surface of the workpiece.

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: The invention relates to a cutting element for a hollow drill comprising a cutting area and an essentially cylindrical area. The essentially cylindrical area has recesses, which are arranged on the inside at regular intervals and open toward the cutting area. In one embodiment of the invention, the recesses extend in an axial direction while being arranged in an interspaced manner preferably in the peripheral direction. The recesses arranged at regular intervals in the peripheral direction produce a geometric shape that is generally described as a polygon. The invention also relates to a cutter support and to a hollow drill. The cutting element is connected to the cutter support via a clamping connection preferably in a manner that enables the cutting element to be detached.

Abstract: A holesaw mandrel assembly has a mandrel with a first shanking end, a body, and a second extending end which includes a threaded spud to receive a holesaw. A first member is secured on the second end. The first member is axially slidable on the second end. The first member also includes a friction surface to contact the holesaw. The friction surface moves between a first contacting position and a second release position. A mechanism on the mandrel moves the friction surface between the first and second positions.

Abstract: A holesaw mandrel has a mandrel body with at least one bore, a pilot drill bit bore, and a first end coupled with the body. The first end is coupled with a driver. A second end extends from the body and includes a threaded spud. A sliding collar is axially movable on the mandrel body. The sliding collar includes at least one pin extending the bore in the mandrel body. A resilient member is positioned adjacent the threaded member to provide enhanced securement of the holesaw. The sliding collar is magnetized to prevent withdrawal of the pin from the holesaw. A positioning member is in the pilot drill bore to provide a desired orientation of the pilot drill bit.

Abstract: A drilling attachment for use in wet and dry drilling operations includes a housing having first and second fluid conduits, and a drive shaft mounted within the housing and having fluid transmitting first and second end portions in fluid communication with a respective first and second fluid conduit. In one embodiment, at any time one end of the drive shaft is coupled to a drive unit and the other end of the drive shaft is coupled to a core drill bit. In a dry drilling operation, dust is extracted from the core of the drill bit, is passed through the drive shaft and exits the housing via one of the fluid conduits. In a wet drilling operation, fluid such as water is passed through the other of the fluid conduits, through the drive shaft and into the core of the drill bit.

Abstract: Pilot drill with coupon retainer and hot tapping machine using the same that positively retains a coupon cut out by a hole saw. The pilot drill bit has a shank having a driving end for attachment to a drill driver and a cutting end having a cutting edge thereon, the cutting edge being sized to drill a hole of selected diameter through a workpiece, and a movable retaining finger mounted on the shank adjacent the cutting edge, the movable retaining finger having a first position fitting within the cutting diameter of the cutting edge and a second, extended position where a portion thereof lies outside the cutting diameter to retain on the drill shank a workpiece through which the drill bit may have drilled.

Abstract: A drilling device is composed so as to drill a drilled object composed of a brittle material with the end of a rotating core bit by using a core bit in which a bit, formed by dispersing and arranging a cemented carbide or super abrasive in a binder phase, is provided on the end of a cylindrical tube, and rotating the core bit around an axis with a direct motor. The drilling device is composed so that the core bit is rotated such that the peripheral velocity at the outer periphery of the bit is 300 m/min or more while the core bit presses against the drilled object at a pressure of 0.6 N/mm2 or more during drilling.

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: The invention is directed at a quick connect mechanism for mounting a hole saw to a tool comprising a hole saw; a mandrel having a first end for mounting to the hole saw and a second end for mounting to the tool; and a drill bit, assembled within the mandrel such that when the mandrel is connected to the hole saw, the drill bit being concentrically centred within the hole saw; a holder, mounted to the tool, for receiving the second end of the mandrel; wherein the second end of the mandrel includes quick connect means for easily mounting the mandrel to and releasing the mandrel from the holder.

Abstract: A hole saw cap for a hole cutter, the cap includes a plate defining a substantially circular peripheral groove and an annular shelf extending radially outwardly from the peripheral groove, the peripheral groove has a recess and a threaded hole extending through a center of the plate. In addition, a hole cutter that includes a cap plate defining a substantially circular peripheral groove and an annular shelf extending radially outwardly from the peripheral groove. The peripheral groove has a recess. There is an elongated band forming an approximately circular shape with opposite ends of the band contacting each other. The band includes a base edge received within the circular peripheral groove in an abutting relationship with an inner edge of the groove and a weld region formed between the band and cap plate and fixedly securing the base edge of the band to the cap plate. The annular shelf of the cap plate extends radially outwardly of the base edge of the band.

Abstract: In a core bit formed with a boring blade at a front end thereof and integrally formed with a mounting portion, at a rear end portion thereof, formed with a guide portion in a cylindrical shape mounted to a chuck portion formed at a concrete drill, a ring-like seal member forming a seal between the mounting portion and a side of the chuck portion is formed at the guide portion in the cylindrical shape of the core bit.

Abstract: The invention relates to a pilot guide and hole-cutting saw system for cutting deep holes through an indeterminate depth of material while eliminating the problem of drift and wobble associated with the use of conventional hole saws. The system comprises a hole saw and a pilot guide, the pilot guide being comprised of a stop, a front guide, a rear guide, and a pilot pin. The pilot pin is created by fitting the central apertures of the stop and front guide over the second end of the pilot pin and by fitting the central aperture of a base portion of the rear guide over the second end of the pilot pin so that the end of the pilot pin terminates inside of the central aperture of the rear guide without passing entirely through the rear guide.

Abstract: A rotary cutting tool fed along its axis of rotation is used for cutting processes in which teeth of the tool do not continuously engage a workpiece, such as forming a cope. A cylindrical body of the tool is fluteless in order to keep the tool's cutting swath to a minimum thickness and thus reduce the cutting forces and heat generation from those of conventional annular metal cutters. Circumferential spacing of teeth about an annular end face of the body acts to contain material removed from the workpiece until reaching a portion of the tool's rotational path in which the workpiece is not engaged, at which point the material is freed from the tool to prevent jamming. An outer surface of the cylindrical body is continuous over a substantial majority of its length in order to ensure adequate tool strength.