Abstract: A boring tool is proposed which has a cutting portion at one end thereof, a driver engaging portion at the other end thereof, a shank arranged between the cutting portion and the driver engaging portion. The shank is formed with a helical groove for discharging cuttings. The driver engaging portion has a hexagonal outer shape and is formed with a hexagonal hole and a recess at bottom of the hexagonal hole for receiving the tip of a driver. The cutting portion has a pointed tip and a substantially conical shape, a first recess formed by cutting off substantially a 180° section of the cutting portion as seen axially from the pointed tip with an edge in the rotational direction forming a cutting edge, and a second recess formed by cutting off substantially a 90° section of the remaining 180° section. The second recess is separated from the first recess by a thin-walled partitioning wall.

Abstract: A power drivable chuck 30 includes a body 72 which is formed with a shank-receiving opening 34 having a triangular cross section. A spring 104 is located about a forward section 78 of the body 72, and is captured within a chamber 102 between a base surface 98 of a sleeve 76 and a forward surface 100 of an intermediate section 80 of the body. A ball 90 is located in a passage 86 formed through the body 72 from an exterior surface 96 to the opening 34. A pair of slots 106 and 108 are also formed in the body in communication, and aligned, with the passage 86 on opposite sides of the passage. The ball 90 is formed with a through hole 112 and receives a pin 114 therein, with opposite ends of the pin extending from the ball and into respective ones of the slots 106 and 108. The spring 104 engages and normally urges the opposite ends of the pin 114 against the base surface 98 of the sleeve 76 normally to extend a portion 90a of the ball 90 into the opening 34 for locking a shank 42 within the opening.

Abstract: A countersink bit device suitable for quick-exchange chucks, the device comprising a body (4) having distal and proximal sides, said body (4) having a shank of hexagonal cross-section (2) projecting from the body proximal side (4), and two tips (9 and 10) attached to notches provided on said body (4), said tips (9 and 10) projecting from said body (4), presenting cutting edges.

Abstract: A drill bit has a chuck engaging shank portion having a geometric cross-sectional shape; a plurality of projections formed on at least a part of at least one of said surfaces; said projections (a) varying in height across said surface, and (b) engaging an inner surface of a chuck to prevent slippage of said bit in said chuck.

Abstract: A twist drill is made of a carbide alloy and has a pair of helical flutes. The flutes are defined by heel surfaces. Each heel surface bulges, or is formed arcuate, and contacts a margin. The center of the arc is located in the drill. The radius of curvature of each heel surface is from one sixth to one third of the diameter of a drill portion. Stress that acts on heels due to forming holes is dispersed by the arcuate shape. This improves the rigidity of the twist drill. Also, swarf is reliably cleared and is not stuck in the flutes. This improves the smoothness of the surface of the formed hole.

Abstract: On a drill with a base body and a replaceable cutting insert, the cutting insert lies in a receptacle that runs through the base body at a right angle to the latter's longitudinal axis and is open toward the drill tip, whereby the cutting insert is in contact by means of two diametrically opposite contact surfaces against the side walls of the receptacle. Between each contact surface of the cutting insert and a side wall of the receptacle, there is a groove that extends in the direction of the longitudinal axis, in which groove a clamping wedge sits with a form-fit and a friction-fit, and interacts with the base body and the cutting insert in the manner of a self-locking device that acts toward the drill tip.

Abstract: A chuck 30 is formed with a generally cylindrical body 54 formed with a bore 60 at a forward end 58 thereof. A fixed clamp segment 134 and a movable clamp segment 166 are located in radial opposition in the bore 60. A pair of ribs 142 are formed on the fixed segment 134 and extend radially inward. A single rib 172 is formed on the movable segment 166 and extends radially inward. The ribs 142 and 172 cooperate to clamp a shank 42 therebetween in a clamping mode. A sleeve 78 is positioned about the body and is movable axially relative thereto. A camming section 88 formed on an interior wall of the sleeve 78 is captured between a head 124 of a pin 122 and a detent ring 132 to latch the sleeve in an unclamped mode. When the shank 42 is inserted into the bore 60, the forward end of the shank engages the pin 122 to move the head 124 against the camming section 88 which, in turn, moves the section past the detent ring.

Abstract: A body 52 of a chuck 30 has an axial opening 34 and is formed with three spaced radial slots 58 which receive three respective locking fingers 68 extending radially inward from a circular band 66. The band 66 is located outside of, and rotatable relative to, the body 52. The band 66 and the locking fingers 68 form a latching unit 64 which is confined to a transaxial plane 61. A spring 70 is attached the latching unit 64 and to the body 52 and normally urges each of the locking fingers 68 against one end of the respective slots 58. A plurality of spaced ribs 54 extend radially inward from an inner wall of the opening 34. A bit 36 is formed with a shank 38 having a plurality of axial grooves 42 which extend through a free end of the shank. A wall of each groove 42 is formed with a transaxial groove 50 at a prescribed distance from the free end of the shank 38.

Abstract: A rotatable cutting tool includes a rotatable tool body and a replaceable cutting tip for chip removing machining. The tool body includes a forward free end having a first dovetail coupling part formed thereon. The cutting tip includes a front cutting end and a rear mounting end. The mounting end includes a second dovetail coupling part joined to the first dovetail coupling part. An actuator, such as a screw, is provided which is arranged for elastically deforming one of the dovetail coupling parts to create a tightly clamped relationship between the first and second dovetail coupling parts. Insertion of a replacement cutting tip is performed by laterally mating the dovetail coupling parts until one of the coupling parts abuts a laterally facing stop surface of the other coupling part.

Abstract: The invention relates to a machining tool with a detachable head comprising: a head (2) carrying at least one cutting blade (3), a slender body (4) and means (5) for detachably fastening the head to the slender body. It is characterized in that: the head (2) comprises, in the rear part, a rotating cylinder (6) centered on the axis of rotation of the tool, and in its so-called front end, at least one lug (8) projecting from the cylindrical surface, the slender body (4) has, opening into its side facing the head, a boring (9) for housing the aforementioned rotating cylinder and a hook (10) mounted on a pivot pin (11), which hook is movable, by a control means (12), between a so-called locked position in which said hook is engaged with the so-called pivot pin of the head and a so-called released position that makes it possible to insert and remove the cylinder from the boring, and in the cylindrical wall delimiting the boring (9), at least one notch (13) for receiving the aforementioned lug (8).

Abstract: A separation type hole saw, includes: a hole saw (3); a hole saw mounting metal fitting (2); a shank (5); a spherical body (13) inserted to the hole portion (12); an annular spring (14) inserted to the annular groove (15) and urging the spherical body (13) so that the spherical body (13) presses the fitting convex portion (2a) of the hole saw mounting metal fitting (2), thereby preventing the fitting recess portion (5a) of the shank (5) from being taken out from the fitting convex portion (2a) of the hole saw mounting metal fitting (2) due to the pressing operation of the spherical body (13); a center pin (6) inserted to a center portion of the shank (5) and guiding the hole saw (3) at a time of drilling a material in which a guide groove (19) is formed in an outer periphery of an end portion of the center pin (6) inserted to the shank (5); and a fitting member (22) provided in the shank (5).

Abstract: A drill gauge for the drilling of blind boreholes of a pre-determined depth in board-shaped parts, preferably into furniture parts, has end faces forming reference edges. An abutment body, which can be applied to the end faces and which is provided with devices for fastening to the board-shaped parts, is provided so as to be able to apply blind boreholes of a pre-determined depth at pre-determined points of board-shaped parts. The abutment body has a borehole flush with the blind borehole to be drilled for the insertion of the drill at whose outer rim an abutment part applied to the shaft of the drill is supported which determines the penetration depth of the drill.

Abstract: A drill steel-chuck assembly which includes a drill steel which has a plurality of faces and opposite ends. The drill steel has one portion adjacent one of the opposite ends thereof and a mediate portion spaced apart from the one portion. The drill steel further has one transition portion between the one portion and the mediate portion so as to join the one portion and the mediate portion. The one portion of the drill steel presents a first orientation of the faces. The mediate portion of the drill steel presents a second orientation of the faces. The one transition portion of the drill steel presents a twisted orientation of the faces comprising a generally constant twist of the faces from the first orientation of the one portion to the second orientation of the mediate portion. There is a chuck for attachment to the drill steel through engagement with the transition portion of the drill steel.

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 tool holder for releasably coupling a bit with a non-circular outer connector surface to a rotary driver. The tool holder includes a socket and a retaining mechanism coupled to the socket and operable in a retaining mode and a released mode. The socket includes a forward end with an opening extending rearwardly from the forward end. The opening also includes a non-circular cross-section adapted to receive the outer connector surface of the bit to couple the bit for rotation with the socket. The retaining mechanism is adapted to permit disposable of the bit into an operative position within the opening and to prevent axial movement of the bit out of its operative position when the retaining mechanism is in its retaining mode. The retaining mechanism is further adapted to permit axial displacement of the bit out of its operative position when the retaining mechanism is in its released mode.

Abstract: A method and apparatus mitigates vibration associated with the rotary cutting machines by providing a first dampening member which is disposed around a tool holder and positioned so as to be compressed intermediate the tool holder and spindle of the rotary cutting machine. A cutting tool is shrink fit to the tool holder. A neck is formed in an elongate shank of cutting tool and has dampening material disposed thereabout. The dampening material disposed around the tool holder, the dampening material disposed around the neck, and the shrink fitting of the cutting tool to the tool holder cooperate so as to minimize undesirable vibration of the cutting tool.

Abstract: A cutting tool includes a working portion adapted to cut a threaded hole or a hole in a predetermined workpiece, a first clamp portion provided at an end opposite to the working portion and adapted to be clamped by a clamping device to facilitate local application of force, and a weak portion disposed between the working portion and the first clamp portion and adapted to bear a torsional force smaller than that borne by other portions. The weak portion, during use of the cutting tool in a cutting operation, is always located on the surface of the workpiece and will break when the cutting tool cannot stand an excessive torsion. The broken portion will likewise always be located on the surface of the workpiece, whereby the user can easily clamp the portion exposed on the outside of the workpiece.

Abstract: In a method for the manufacture of a drilling tool a conical seat is constructed by abrasion on the drilling tool (11) for the preferably positionally accurate, oriented connection of drill head and drill shank. Abrasion preferably takes place by milling or erosion.

Abstract: Two-piece drill bits and methods of manufacturing same provide a preferably hexagonal shank, and a drill portion having a proximal end inserted into an axial hole in a distal end of the shank. In a preferred embodiment, at least part of the area adjacent the proximal end of the drill portion is knurled. Alternative embodiments have wings, polygons, tapers or other irregular shapes, or combinations of same. A variety of means may be employed to mechanically capture the drill portion in the shank.

Abstract: Two-piece drill bit and methods of manufacturing same provide a preferably hexagonal shank, and a drill having a proximal end inserted into an axial hole in a distal end of the shank. In a preferred embodiment, at least part of the area adjacent the pr drill portion is knurled. Alternative embodiments have wings, polygons, tapers or other irregular shapes, or combinations of same. A variety of means may be employed to mechanically capture the drill portion in the shank.

Abstract: A tool holder holds a shank of a cutter tool. The tool holder comprises a supporting cylinder. An operation body moves between a locking positionand an unlocking position A locking member is supported by the supporting cylinder. The locking member moves radially in accordance with the position of the operation body. An engaging member is located between the supporting cylinder and the operation body. The engaging member moves between an engaging positionand a disengaging position When the engaging member is in the engaging position, the operation body is prevented from moving relative to the supporting cylinder and is held in the unlocking position and when the engaging member is in the disengaging position the operation body is allowed to move relative to the supporting cylinder. This mechanism facilitates smooth insertion of the cutter into the supporting cylinder.

Abstract: A chuck 30, 232 includes a pair of jaws 178, 304, 306 which are located within an axial opening 114, 246 of a body 106, 234 for receipt of a shank of a bit therein. A roller 186, 238 is located in a slot 134, 272 of the body 106, 234 and can be pressed into the shank of the bit to clamp the shank between the jaws 178, 304, 306 and the roller. A sleeve 196, 240 is biased and structured to normally urge the roller 186, 238 into the shank-pressing position, and is movable relative to the body 106, 234 to facilitate removal of the shank from the chuck 30, 232.

Abstract: The invention is a tool bit for use in a socket or chuck mechanism. The tool bit includes an elongated shank having an operative tip end and an opposite tail end. A polymer jacket is molded about the tail end of the shank, and the jacket in the lateral cross-section, has a hex-shaped outer surface.

Abstract: A tool for milling and drilling where the rotating tool has a bearing surface provided to cooperate with another bearing surface to take up radial cutting forces. The two surfaces are mutually separated by a fluid and are essentially axially non-slidable when the cutting tool is engaging the workpiece.

Abstract: A drilling tool includes a shaft having a front end to which a cutting body provided with cutting edges is detachably connected. In the front end of the shaft, a seat is formed which is delimited by spaced-apart protrusions between which there is a bottom surface. In the protrusion, there is a threaded hole for a screw, which when tightened applies pre-stressing forces to the cutting body. On the inside of the opposite protrusion, there is a supporting shoulder against which the cutting body is pressed when the screw is tightened and applies a lateral pre-stressing force to the cutting body. The protrusions are laterally displaced in relation to each other in order to freely expose the screw beside one of the protrusions.

Abstract: A drill bit for boring non-linear holes in a workpiece, the drill bit having a generally elongate post, for mounting the drill bit to a tool; a generally elongate shank; and a head. The head has a front portion, a rear portion and there between a main body portion. A plurality of flutes are arranged in a generally helical shape along the main body portion, arched with respect to a longitudinal direction of the drill bit, each flute having an outer cutting edge arranged on an outside edge of the flute, to provide cutting capability in a direction substantially sideways compared to the longitudinal direction of the drill bit. A central point, arranged on the front portion of the head, is connected to at least one flute via a tapered first cutting portion, the first cutting portion being provided with a first cutting edge, to provide cutting capability in a direction substantially forwards.

Abstract: The invention relates to a tool system that can be coupled to the drive shaft of a lathe. Said system comprises a tool holding fixture which can be connected to the lathe, and a took which is stored in a polygonal recess in the tool holding fixture so as to be torsion-proof yet removable. This tool has a tool shank and at least one functional section extending coaxially therefrom. The tool rests axially on a centering area in the polygonal recess, and rests radially on several identical locking elements. These are arranged in radial cavities in the tool holding fixture, at equal angular distances and at an axial distance from the centering area. This enables centering of the tool in the tool holding fixture.

Abstract: A tool tip and tool body assembly includes a tool tip having a first end for contacting a workpiece and a second end, the second end having a patterned surface of recesses and protrusions, and at least one through hole extending through the tool tip from the second end. A tool body has a first end having a patterned surface corresponding to the patterned surface of the tool tip for mating with the patterned surface of the tool tip, and at least one threaded hole adapted to align with the at least one through hole in the tool tip. At least one fastener having a threaded end and a securing end is provided, the fastener extending through the at least one through hole such that the securing end abuts against a surface in the at least one through hole, the threaded end mating with threads in the threaded hole. Torque is transmitted between the tool tip and the tool body solely by the at least one fastener and the patterned surface of the tool tip and the patterned surface of the tool body.

Abstract: Apparatus and methods for coupling a driving shaft and a mating tool shaft to transmit rotational forces and axial tension and compression forces between the shafts. The coupler provides for axial tension transmission through tension transmission surfaces spaced-apart from torque and compression transmission surfaces of the mating tool shaft. Reversible shaft locking means prevent accidental disconnection of the driving shaft and mating tool shaft. A separate safety lock release attachment is preferably removed during tool shaft rotation and can automatically hold the driving shaft stopped when used to release the shaft locking means for a tool change. An optional reversible mechanical interlock further ensures that the driving shaft will remain stopped during a tool change. Malfunciton (e.g., improper seating) of the shaft locking means with the attachment ring in place results in a positive visual indication of the malfunction.

Abstract: A chuck 40 includes a body 42 having a plurality of angularly spaced ribs 166, 168 and 170 formed in a forward cylindrical opening 48 thereof. A locking element 236 is movable within a passage 180 of the body 42, and is formed with a defined portion 242 which is extendable from the passage 180, through an inboard peak surface 172 of the rib 166 and into the opening 48. An actuator 44 is coupled to the locking element 236 and is biased by a spring 250 to urge normally the defined portion 242 of the locking element into the opening 48. A bit 62 is formed with a shank 96 with three grooves 100, 102 and 104 extending axially to a free end 112 thereof. A pocket 114 is formed in a base of each of the grooves 100, 102 and 104. The bit 62 can be manually inserted into the opening 48 of the chuck 40 such that the grooves 100, 102 and 104 are located drivingly over at least portions of the ribs 166, 168 and 170, respectively.

Abstract: An improved insulated, heat shrink tool system and method of assembly, which utilizes an insulating sleeve within the internal opening of a heat shrink tool holder wherein the insulating sleeve has a thermal conductivity less than that of the tool holder. In use the tool holder, is heated by means of an induction heating system, or hot air. As the tool holder is heated it expands outwardly thereby enlarging or increasing the internal diameter of the holder. The internal section of the holder is lined with an insulating sleeve prepared from titanium or a titanium alloy having a thermal conductivity less than that of the holder. The insulating sleeve is brazed to the inner wall of the holder so that the expansion of the holder during heating will result in a simultaneous, and equal expansion of the inner diameter of the insulating sleeve. The shank of a cutting tool is than inserted within the insulating sleeve of the holder and the holder is allowed to cool.

Abstract: In the broader aspects of the invention, there is provided a new and improved tool driver having a shaft with a longitudinal axis and opposite ends and tools therefor. A boss is secured at one of said shaft ends by which the tool driver is connected to a rotary tool. A tool collate is secured at the other of the shaft ends by which the tool driver may be driven by a surgical hand piece having a chuck in which the collate may be positioned. The boss has a surface which engages the tool and positions the tool exactly coaxially of the tool driver. A latch mechanism is provided to hold the rotary tool on the boss, whereby the rotary tool is held exactly coaxially of the driver during use. The rotary tool which is used with the driver has a bottom tool driver opening which has the same dimensions as the boss of the tool driver of the invention. The boss thus fills the opening and the opening is complementary to the boss.

Abstract: A shank fitting structure simple in structure and easy to machine and assemble. A shank (20) has an external diameter large enough to allow it passage in a state where a detent member (5) is moved bach radially outward, and includes a stepped portion (21) for butting by providing a small diameter portion on the end side an d a recess (23) for housing the projecting part of the detent member (5) formed in the tip part. On the internal circumferential face of an opening part (2) of an arbor A, a first sleeve (6) is provided and pressed by an elastic member (8) toward the edge of the opening in such a way that its tip comes into contact with the stepped portion (21) of the shank (20) and its external circumferential face can keep the detent member (6) back toward the external circumference.

Abstract: A drill bit and a manufacturing method thereof that ensures integral mounting of a drill and a drill holder with a simplified construction and in a simplified manner are disclosed. The drill bit has a drill with a bit and a shank, and a drill holder formed with an axial insertion hole for fitting the shank. An engaging part is formed at a base end of the drill. A blind hole that intersects the insertion hole is formed in the drill holder to form a restricting part, or a stopper equivalent to the restricting part is fitted in the bottom of the blind hole. Engagement of a top of the stopper or the restricting part with the engaging part prevents a relative rotation of the drill to the drill holder.

Abstract: A machine tool extension for use with a cutting tool having a generally cylindrical shank portion. The machine tool extension comprises an elongate, generally cylindrical shank which is fabricated from a thermally expandable material and includes a first end and a second end which defines a peripheral edge. Extending axially within the second end of the shank is a bore having a diameter which is slightly less than the diameter of the shank portion of the cutting tool. The second end of the shank is formed with a slight inward radial taper such that the bore terminates inwardly of the peripheral edge of the second end.

Abstract: An end mill comprises an arbor, a tool body attached to an end of the arbor, and throw-away chips detachably attached to an end face of the tool body. Each throw-away chip has a cutting edge having a peripheral circular cutting edge section for shaping, and an end straight cutting edge section for end milling.

Abstract: A method for supplying the working parts of a cutting tool with a lubricant which both cools and lubricates the cutting tool. A dispenser is connected directly or indirectly to the cutting tool to enable lubricant to be fed to the working parts of the cutting tool through at least one channel in the cutting tool. A cutting tool is also disclosed with a shaft, a cutter, at least one internal lubricant channel and at least one reservoir being fitted as a dispenser for the lubricant. The reservoir is directly or indirectly connected to the cutting tool by mechanical connections and to the at least one lubricant channel to permit the passage of lubricant. In addition, a tool holder designed to hold the cutting tool is disclosed. The tool holder has an internal dispenser for the lubricant. The dispenser is connected, when the cutting tool is fixed in place, to the at least one lubricant channel in the cutting tool to permit the passage of lubricant.

Abstract: In a shaft-type cutter body of hard material including a shaft for mounting the cutter in a chuck and a head including cutting areas with cutting edges disposed around the circumference of the head, the shaft and the head are formed integrally by injection die casting of powdered raw material followed by sintering. The unfinished cutter body includes cutting edge sections with recessed areas adjacent the cutting edge front surface area for receiving wood chips and delimiting the cutting edge surface area and a surface area receding radially inwardly from the rear cutting edge surface area of the cutting edge so as to limit the rear cutting edge surface area.

Abstract: A method for producing cutting tools incorporated in the present invention is carried out as follows: a shank portion and a drill portion are formed separately such that the inner diameter of a hole made in the shank portion is slightly smaller than the outer diameter of the drill portion. The rear of the drill portion is forcibly inserted into the hole of the shank portion at normal temperature which is room temperature. The diameter of the inner wall of the hole is thereby enlarged, resulting in a tight fitting. After the insertion of the drill portion in the shank portion, the drill portion may be ground to form a drill edge. Before the insertion of the drill portion in the shank portion, the shank portion may be quenched under vacuum or the like, or the surface of the shank portion may be hardened by nitriding.

Abstract: A fluid container draining device (10) for use in draining a fluid container, such as an oil filter (12) in a controlled manner. It has a drill bit (14) with a sharpened tip (16) and exterior channels (20) on its shaft (18) extending from its tip (16) to a rear region (22). The drill bit (14) is immobilized in an axial bore (3) of a drill bit holder (24) which has a threaded front region (26) which is preferably frustum-shaped. Located rearwardly of the drill bit holder (24) is a valve (42) which when opened up permits fluid to be drained from the fluid container (12) through the channels (20) on the drill bit's shank (18), through the axial bore (30) in the drill bit holder (24), and out through the valve (42).

Abstract: The tool drive system for use with a chuck having a throughbore including an outer bore portion for receiving a tool or tool holder and an inner bore portion constructed to receive and be mounted on an outer end of a motor shaft of a power tool comprises: an insert received in the inner bore portion; structure for preventing rotation of the insert relative to the chuck; structure on the insert for engaging an inner end of a tool or tool holder; and a mechanism for holding the tool or tool holder against axial movement relative to the insert.

Abstract: The elongate rod shaped non-impact and non percussion drilling tool comprises: a non-impact and non-percussion drilling tool or implement formation at an outer end of the shank, a portion of the shank having a polygonal cross section at a location on the shank other than at an inner end of the shank, an annular groove in the shank which is only wide enough to receive a detent to prevent axial movement of the tool when it is received in a snap-in chuck assembly and a spline formation at an inner end of the shank. The chuck assembly includes either a polygonal drive structure in a center bore of the chuck assembly or a rotatable nose collar or an axially movable nose collar whereby a tool received in the center bore is held by friction in the polygonal drive structure or by a rotatable movement or an axial movement of the nose collar.

Abstract: Significantly improved resistance to breaking while drilling in metal can be realized in twist drill bits having a web thickness taper which is about twice the web thickness taper specified in Standards and in common use in the industry. This creates much shallower flutes and flies in the face of conventional wisdom in the art which holds that the web taper rate should be low to maximize the amount of flute volume available to convey chips and sawdust out of the hole. A flute length of about 1/2″ less than the flute lengths specified by the Standards makes it possible to have such a large taper rate but still control variations in tolerances for the flute length. It also provides a marking zone for placing size indicia on the drill bit shank outside the portion which is gripped by the chuck jaws of a power drill.

Abstract: A dental instrument is provided with a pivotally arranged shaft and a head mounted to the shaft. The head is equipped with a plurality of cutting blades. The cutting blades have a clearance angle of 0° and a negative cutting angle. The areas of the blades that trail the cutting edges are either planar surfaces or a partially cylindrical shape. In some embodiments, the front area of head is provided with a circumferential groove that is open at the front side, into which an annular contact element (O-ring) is inserted. The contact element can have the shape of an elastic ring.

Abstract: A drill bit having a drill body and a drill shank including a substantially cylindrical guide portion (10) having at least one guide surface (101, 102), and a locking portion (11) projecting radially beyond the guide portion and having locking surfaces (111, 112) extending substantially perpendicular to a longitudinal axis of the drill bit, with the locking portion (11) having, perpendicular to the drill bit longitudinal axis, a non-circular cross-section; and a drill chuck for receiving the shank.

Abstract: A tool for hand-held equipment and including a shank (2; 22; 32) with a clamping region (3; 23; 33) having a diameter (t) equal to or greater than 12 mm, at least one locking groove (4; 24; 34) provided in the clamping region (3; 23, 33), and at least one drive groove (6; 26; 36) provided in the clamping region (3; 23; 33), with the at least one locking groove (4; 24; 34) and the at least one drive groove (6; 26; 36) having each a depth (v; d) equal to or greater than 2.5 mm and opposite edges (8; 9) lying on a shank circumference, and forming with each other, an aperture angle (&agr;; &bgr;) equal to or greater than 50°.

Abstract: A hand drill extender kit has components which are used with a length of electrical conduit to make an extender, a near end of which can be held in the chuck of a hand drill and a far end of which can hold a tool such as a hole saw, the components comprising a chuckable part, a tool holder part, a coupler for coupling two lengths of the electrical conduit, a jig to drill holes diametrically through the electrical conduit for fastening the electrical conduit to the other components, an auxiliary tool holder for tools with larger shafts, and a sample length of electrical conduit with the holes pre-drilled.

Abstract: An impact breaker has a sleeve which slidably receives an end portion of a tool. The tool is formed over its end portion with a groove extending completely around the end portion of the tool for receiving lubricant for lubricating movement of the tool in the sleeve.

Abstract: The present invention is a combination of a flexible arm with a collet assembly. The assembly includes an elongated flexible arm or tube with a collet at one end and a releasable mounting assembly integral with the opposed end. The collet is arranged to grippingly receive and retain a tubular work item therein, such as a flashlight, magnifying glass or lense, clamping retainer, or the like, with the work device having a circular cross-section and in the form of a tube, sleeve, cylindrical shaft, or the like. The releasable retaining mechanism includes a prong and socket assembly, with the prong portion being preferably integral with the flexible arm, and with the socket portion being adapted to releasably retain the prong and accordingly the flexible arm and collet assembly. The collet is provided with an outer external ring which slidingly engages with the internal gripping fingers, thereby simplifying the attachment to the working device.

Abstract: A machining tool and method of making same includes a blank that is formed to a shank and which is provided with machining faces. The machining faces are configured to expose material of a PCD or PCBN element that is formed in a recess in the blank and fused to the blank using material from the transition group of elements, such as cobalt. The recess has a configuration that is defined by side walls, a base wall, and end walls, so as to define a mold in which the PCD or PCBN material is formed into an element that becomes fused with the blank. Such fusing is achieved by leaching of the cobalt into the PCD or PCBN element during the application of heat. Thus, no additional fabrication process is required for joining the PCBN or PCD material to the blank.