Abstract: A tool positioning device and a machining element have simple structures which can reduce running cost. In addition to a hole that engages with a shank of an end mill, a channel is provided so that it penetrates through the device such that one end thereof communicates with an upper face of the device and the other end communicates with a lower end of the device. In this case, it is more effective to provide a concave portion that is opened to the upper face and communicates with the hole. The same effect may be obtained by making a cylindrical hole, for example, instead of the channel.

Abstract: A device (20) for orienting a work tool (10) at a predetermined attitude relative to a work piece includes a base (22) having a first surface (34 or 44) abuttable against a work piece, a sleeve (24) coupled to the base, and a shaft (26) slidably receivable within the sleeve. The shaft has a first end portion (80) and a second end portion (82), wherein the first end portion is connectable to a work tool and the second end portion is connectable to an actuator for actuating the work tool.

Abstract: A machining method for machining a superficial portion of a laminate using machine tool having a depth limiter which restricts a maximum depth of the machine tool. A guide frame having an inner guide contour restricts a maximum dimension of the superficial portion, and is secured over the superficial portion. The superficial portion is machined while the machine tool is guided by the guide contour. From another point of view, a machining apparatus for machining a superficial portion of a material is provided. The machining apparatus comprises a guide frame, an inner guide contour for guiding a machine tool, an attachment member for securing the guide frame to an attachment member, adjacent to the superficial portion, of the material.

Abstract: A countersinking-carrier nozzle has a flat front surface with a central hole via which emerges a countersinking drill, such that said flat front surface establishes a limit to the penetration depth of the countersinking nozzle. The nozzle includes a flexible retainer for the nozzle front surface so that it swivels when making contact with a curved countersinking surface, adapting itself tangentially to it while the headstock presses against the countersinking surface. The flexible retainer is defined by a ball-and-socket joint including a curvo-concave retaining receptacle, with the possibility of swivelling, with a complementary curvo-convex portion provided in the rear part of the flat front surface. This portion projects with respect to the receptacle to allow it to swivel when pressed against the countersinking surface, at which moment the complementary curvo-convex portion of the rear part of the front surface swivels in the receptacle of the headstock.

Abstract: A power tool with a tool portion and at least one attachment. The tool portion has a tool body and a drill chuck. The drill chuck includes a rotatable spindle, a plurality of jaws that are coupled to the rotatable spindle and a cover that is disposed about the jaws and which is not coupled for rotation with the rotatable spindle. The attachment is coupled the cover of the drill chuck.

Abstract: A system, apparatuses and methods for anchoring are provided. The system includes two-stage drill bit and a method of anchoring into a two-stage hole drilled by the drill bit. The apparatus of the instant invention includes a two-stage drill bit for drilling a pilot hole for a common nail into a material such as concrete, stone, masonry or cementuous or other materials. The method of the instant invention includes the steps of drilling a first hole within a material to which an object is to be anchored, drilling a second hole concentric with the first hole, and placing an anchor within the holes.

Abstract: A drill bit apparatus having a central shaft and an annular collar mounted thereon. The central shaft is coaxially positioned within the annular collar. The central shaft has a bit end and a cutting tool end. The annular collar is spaced between the bit and cutting tool end. The bit is configured for releasable securement in a chuck of a drill or drill press. The cutting tool end is configured to securably receive a cutting tool therein. The cutting tool lower portion has a central bore cutter essentially coaxial with the shaft. The upper portion of the tool comprises a counter bore cutter having a width greater than the central bore cutter. The counter bore cutter extends below a lower surface of the annular collar a distance less than the distance the central bore cutter extends below the lower surface.

Abstract: An adjustable drill microstop apparatus is employed with a drill and a drill bit to limit the depth of a hole drilled into an object surface by the drill bit. The apparatus has a housing and a nose piece that is mounted for reciprocating axial movement in accordance with a plurality of user selectable depths of cut. The nose piece projects from one end of the housing and is positioned adjacent the object surface to receive the drilled hole. The nose piece has an opening into which the drill bit is inserted, and an engagement surface that engages with the object surface during the drilling operation. During the drilling operation, the drill pushes the nose piece into the housing as the drill bit performs the drilling operation. A pre-selected distance that the nose piece reciprocates in the housing limits the depth of the hole drilled by the drill bit into the object surface.

Abstract: A depth limiting device includes a stop collar having a an open end portion and an workpiece engaging portion extending along the open end portion thereof for contacting a workpiece; a spindle extending axially through the shell, the spindle including a first end extending from the exterior of the stop collar for attachment to a hole forming apparatus, and an second end interior to the stop collar for attachment to a hole forming bit, wherein the attached hole forming bit projects through the open end portion of the stop collar at a predetermined length corresponding to the desired depth of the hole in the workpiece; and a bearing assembly operatively associated with the stop collar and the spindle for isolating the rotation of the spindle from the stop collar whereby the stop collar ceases to rotate when contacting the workpiece without generating sufficient frictional contact to mar or otherwise damage the workpiece.

Abstract: A stop for use with an electric drill bit, the stop having at least one threaded sleeve for positioning the stop relative to a surface into which the drill bit will extend. The stop may have both an inner and an outer sleeve. The sleeves are mounted coaxially, one inside the other about the drill bit. One of the sleeves, preferably the inner sleeve, provides coarse adjustment of the position of the shoulder relative to the tip of the bit, while the other, preferably the outer sleeve, provides fine adjustment of the position of the shoulder relative to the top of the bit.

Abstract: A device for use in an endodontic root canal, performed using a dental drill hand set has a first upper unit coupled to the drill hand set. The first upper unit is cylindrical in shape and has a first drill shank shaft therethrough. The upper unit has a first threading on its outside surface. A second bottom unit, cylindrical in shape, is also provided, having a second drill shank shaft therethrough. The second bottom unit has a second corresponding threading on its inside surface. When the second bottom unit is screwed onto the first upper unit a root canal jig is formed having a set height and allowing a shank from the drill hand set to pass through the first and second drill shank shafts, such that when the drill shank of the drill hand set is drilled into an affected tooth for a root canal, the drill shank is prevented from drilling along its entire length into the root of the affected tooth when the bottom of the root canal jig contacts the top of the tooth.

Abstract: A method for repairing an insulating glass unit and apparatus to facilitate such repair. A bore is drilled through a frame encasing an insulating glass unit to expose the peripheral spacer of the unit, and a hole is drilled through a wall of the spacer to enable air to enter the space between the panes. The hole in the spacer is then sealed, for example, with a rivet, and the bore in the frame is then filled and sealed as well.

Abstract: A depth stop for use with a drill bit comprises a tubular body having an opening therethrough. Used with a drill bit whose bit portion includes a cutting end, and a shank portion, the depth stop is frictionally positionable on the bit portion at a specified point from the cutting end, thereby indicating a specified depth. Depth stops are manufactured in different colors, each color corresponding to a specified range of drill bits that the depth stops will fit. The depth stops, manufactured from a sterilizable material, are intended for single use. The depth stop can be used with a drill bit and drill extender, where one or more depth stops provide multiple visual points of reference for the operator. The depth stops can be quickly mounted onto most any manufacturer's drill bits.

Abstract: A drill bit includes a body defining an axis and first and second cylindrical portions, a coupling adapted for connection with a rotary driver, and a depth stop adjustably secured to a first portion by a plurality of adjusting fasteners in a manner to limit penetration of the bit into a target surface. A method of drilling a hole into the surface includes locating a drilling machine fitted with a drill bit over a target location, compensating for wear on the bit by setting a depth stop to limit travel of the bit at the predetermined depth, drilling at the target location until the depth stop contacts a surface, where the primary cutting surface forms a portion of the hole defined by a first diameter and the secondary cutting surface forms a portion of the hole defined by a second diameter in a single step, and removing the drill bit from the hole.

Abstract: A cutter bit for use in combination with a rotary cutter, the cutter brick comprising a removal boss integrally formed on the cutter bit shank adjacent to cutter bit body to allow removal of the cutter bit from the rotary cutting tool with a wrench ordinarily used to operate the chuck mounted on the rotary cutting tool. A boss includes a pair of spaced apart annular flanges extending outwardly from the shank and a concave angular area extending between the flanges.

Abstract: A security device includes a stop member for a rotary drilling instrument used in particular in dental surgery. The stop member is capable of being positioned at a desired depth of drilling and of preventing the depth from being exceeded. The two elements drilling instrument and the stop member include coupling elements directly or indirectly linking them together and co-operating elements capable of transforming their movement, such that when the device is operating, the drilling instrument is retracted rearwards relative to the drilling direction and to the position of the stop member under the action of the elements when the front part of the stop member comes in contact with a neighboring surface. The co-operating elements preferably consist of a screw-nut system, the direction of the thread(s) of the system and the rotating direction of the drill being opposite. A device comprising a gauge containing a piston enables to pre-calibrate and store the desired drilling depth.

Abstract: A depth adjusting system for a screw gun comprises a base supported on the screw gun, an on/off collar removably attached to the base, and an adjusting collar and a depth locator mounted to the on/off collar. The adjusting collar rotates but cannot move axially relative to the on/off collar. Rotation of the adjusting collar causes the depth locator to move axially relative to the on/off collar for adjusting the depth setting. An indexing system is provided between the adjusting collar and the on/off collar for retaining the angular position of the adjusting collar and the depth setting. The on/off collar can be easily attached and detached from the base with a simple axial force applied to the on/off collar.

Abstract: An adjustment device comprises a first portion and a second portion. The first and second portions are adjustably engaging one another. The adjustment device has an overall length that is adapted to be adjusted by adjusting the first and second portions relative to one another. The overall length is adapted to be adjusted to vary a distance between the drill motor and the work piece. Another embodiment of the invention comprises a slip fit member and a threaded member opposite the slip fit member. The adjustment device has an overall length that is adjustable to vary a spatial relation between the drill motor and work piece. Yet another embodiment of the invention comprises a drill motor, a support, and an adjustment device. The adjustment device comprises a slip fit member and a threaded member spaced apart from the slip fit member. One of the members is engageable with the drill motor and the other member is engageable with the support.

Abstract: Driving engagement is obtained between an arbor held in a machine tool and a collet holder that supports a drill bit by locking balls that are secured in engagement with drive surfaces by a locking ring. A nose cone is adjustably attached to the front of the locking ring and when the nose cone bottoms out on the workpiece, continued movement of the drill bit assembly relative to the nose cone assembly causes the locking ring to allow the locking balls to disengage the collet holder after ½″ additional travel. Inner and outer springs reposition the clutch mechanism in its initial position for subsequent drilling operations.

Abstract: A holder for holding a tool bit having an elongated connector means with a first end and a second end. The elongated connector means has a central longitudinal hole, of a cross-section corresponding to the cross-section of a mounting portion of the tool bit, at the first end, and a tool mount at the second end, and where the elongated connector means has a first circumferential groove adjacent the second end and a second circumferential groove adjacent the first end. A first sleeve is arranged to reciprocally slide over the connector between a first end position and a second end position, where the first sleeve has a third end facing the tool bit and a fourth end facing the hand tool.

Abstract: The stop element is set forth for solving a problem of the clinician only being able to visualize a depth marking on a drill bit or a similar tool. The detachable stop element limits the penetration of the drill bit beyond a predetermined axial distance on the drill bit. The stop element consists of a connecting portion and an extending portion, both having an inner wall defining a bore extending entirely through the connecting portion and extending portions. The connecting portion has a surface that contacts the drill bit for restricting the axial movement of the stop element relative to the drill bit. The extending portion terminates in a lower end for engaging the bone surrounding the bore to limit the penetration of the drill bit. The stop element may include a plurality of grooves for altering its length so that the penetration depth of the drill bit can be altered.

Abstract: A tool holder comprising an elongated connector means having a first end and a second end, where the elongated connector means has a central longitudinal hole, of a cross-section corresponding to a cross-section of a mounting portion of the tool bit, at the first end, and a tool mount at the second end, and a first sleeve arranged to reciprocally slide over the connector means between a first end position and a second end position, the first sleeve having a third end facing the tool bit and a fourth end facing the hand tool.

Abstract: A countersink cage for controlling a rotating countersink cutter to penetrate to a predetermined depth through a curved surface along a cutting axis. More specifically, the countersink cage comprises a top cage member with a top aperture which is formed for receiving the rotating countersink cutter axially therethrough. Rotatably attached to the top cage member is a bottom cage member. The bottom cage member has a bottom aperture aligning itself with the top aperture for receiving the rotating countersink cutter axially therethrough. Further, two contact members extend from the bottom cage member. The two contact members are sized and configured to contact the curved surface when the countersink cutter penetrates therethrough along the cutting axis to the predetermined depth.

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 tool for use with a power drill for removal of rivets in light alloy panels and other structures. A hollow, cylindrical drill cage is mountable to the bottom of a tool body having a reciprocating drive shaft. A drill bit which is mounted on the lower end of the drive shaft extends downwardly through the cage and passes through a guide bushing at the lower end thereof. The guide bushing has an axial bore for receiving and guiding the drill bit, a central socket for receiving and holding the head of the rivet, and a broad annular surface which extends around the socket so as to engage the surrounding material and stabilize the tool and bit perpendicular thereto. The drill cage has port openings formed in the sides thereof for discharge of shavings which are pulled upwardly by operation of the bit, and a channel is also formed across the annular stabilizing surface for discharge of chips and shavings therethrough.

Abstract: The present invention provides an orthopaedic instrument system and method for reaming a long bone to a predetermined depth. The instrument system includes an elongate reamer having a proximal portion and a bone contacting surface with an integral cutting element. A stop indicating sleeve having an axial bore and a stop indicating element is removably disposed about the reamer. The stop indicating sleeve may be provided with a stop element and a distal bone contacting surface. Reaming beyond the predetermined reaming depth forces the stop indicating sleeve proximally and urges the stop element on the sleeve into engagement with a stop engaging element provided on the reamer.

Abstract: A method and apparatus for controlling the penetration depth of a cutting tool of a numerically controlled machine. A substantially cylindrical collar extends around at least part of the cutting tool with the collar being axially movable with respect to the axis of rotation of the cutting tool. An electronic sensor, secured to a non-rotatable housing of the numerically controlled machine transmits a signal to terminate further penetration of the cutting tool. The sensor is situated adjacent the collar and axially rearward thereof. A locking pin is provided for preventing an axially rearward end of the collar from touching an axially forward end of the electronic sensor when the collar is not being subjected to a force acting in a rearward axial direction. A nose bush for pre-positioning of the collar relative to the cutting tool in the axial direction is advantageously provided.

Abstract: A hand tool (1) having a drive motor (12), a depth stop (16) by which the drive motor (12) can be automatically switched off when it is in contact with a workpiece (4), and a switching mechanism (21) in an electric circuit (22). The electric circuit (22) includes a switch (24) for switching the drive motor (12) on and off, a first contact element (25) for reversing the polarity of the drive motor (12) and a second contact element (26) for switching off the drive motor (12) by the use of the depth stop (16).

Abstract: A multistage bit is provided with a base part having a profile of stepped conical body with its tip cut off, and with a tip drill having a blade B of the smaller diameter than the blade B which is formed on the stage 2 at the foremost end of the base part A, the latter being provided freely detachably at the tip of the base part A.The stopper S for the above multistage bit comprises a ring shaped member having elasticity in the radial direction with its free diameter slightly smaller than the diameter of each stage of the multistage bit, a part of said ring shaped member being cut, and at least one cut end 18 thereof is bent to the center side of the ring so as to be stopped in the vertical groove 19 formed on the outer periphery of the multistage bit, and the height of the ring H is constituted to be equal to or slightly higher than the height of the stage 2.

Abstract: A drill instrument with calibrated depressions as markings on the shaft set at determinable distances apart, e.g. at 1 mm increments is disclosed. These calibrations are designed to give a visible depth gauge indication when the tip or point of the drill is at the full length of the depth of a drilled hole. A stop means is variably fixable to the drill at determinable locations. This stop defines a predetermined length available for drilling a hole into bone or a tooth canal up to the precise location of the stop on the drill corresponding to the depth desired to be drilled.An organizer block or kit accommodates the drills and stops of the invention and preferably provides an alignment device for preparing drills having the pre-determined lengths according to the invention via a drill-length determining device for applying the stop means to the drill at the desired pre-determined length.

Abstract: A boring tool includes a depth stop for regulating cutting depth of the boring tool. The boring tool has a shank and an elongated cutting head. The depth stop includes a sleeve body which is selectively, detachably fixed to a shank of the boring tool by a sleeve body attaching mechanism and a cutting depth regulating structure that is rotatably mounted to the sleeve body. A depth stop for regulating cutting depth of a rotary cutting tool having an axis of rotation includes a cutting depth regulating structure having circumferentially spaced, radially extending tines including a portion extending substantially in parallel to the axis of rotation and may be selectively, detachably fixed to the rotary cutting tool by a collet.

Abstract: A depth stop is provided that is selectively attachable to a cutting tool at an operator-selected location. The end of the depth stop that comes into contact with a work piece during operation is covered with a rotating cap. The cap prevents the work piece from being marred because the cap stops rotating when it comes into contact with the work piece while the cutting tool and the rest of the depth stop continue to rotate. The cap is rotatably mounted on the depth stop by a flange that engages a groove formed in the depth stop. An annular ring is provided between the cap and the end of the depth stop body to facilitate the rotatability of the cap with respect to the body.

Abstract: A quill stop for a milling machine, drill press, or other like machine. The quill stop includes means for automatic control of coolant flow. The quill stop includes a passage through which high pressure air flows. A valve in the passage controls the air flow. The valve is activated by contact of the quill stop with a dog stop on the machine. The quill stop may also include a self contained mist unit activated by the valve.

Abstract: A drilling jig for surgical drilling tools is disclosed. The drilling jig comprises two sleeves of identical design mounted alongside each other on a common holder, with each sleeve being mounted on the holder so as to be pivotable in relation to each other about an axis of rotation extending perpendicular to their respective longitudinal axes. Each sleeve is hollow to allow a drilling tool to pass through. At the rear end of each sleeve is a stop surface for the drilling tool to rest against, the stop surface delimiting the depth to which the drilling tool penetrates the sleeve. Each sleeve is of two-part design and includes a bearing part and an adjusting part, with the bearing part carrying the front end of the sleeve and the adjusting part carrying the stop surface.

Abstract: A device to stop the penetration of a cranial drill that is used to pierce the skull during neurosurgical procedures. The device uses a plurality of spacers that each have a body in the form of a cylinder having a bore extending therethrough with a flat disc adjacent the cylindrical body with a plurality of tabs fixed to the disk in a circumferential pattern around the bore and axially aligned therewith. The periphery of the disk having a diameter larger than the cylindrical body portion to form a gripping member. Each of the tabs having an indent positioned on an outer surface and an interior surface of the cylindrical body portion having a bead positioned around the interior diameter of the cylindrical body portion so that the indents in the tabs are adapted to engage and retain a bead of another spacer when the spacers are fitted together to define a drill stop. Each of the plurality of spacers are of different lengths than at least one of the other spacers.

Abstract: The present invention relates to a device that is hand held and independent of a drill, either hand held or powered by electricity. This device consists of a tubular housing with a turn screw plunger shaft and a scale for measurement in inches on one side and metric on the other side of a liner window opening on one side of said tubular housing The user selects the depth of the hole to be drilled, sets the turn screw to that depth as indicated on the outside scale. The leading end of a drill bit is then inserted in the receiving end opening in the tubular housing that is opposite to the turn screw plunger. Thereafter, a collar with a set screw is placed over the flat end of the bit and secured by the set screw to the bit at the receiving end wall of the device of the present invention. The bit, on which the set screw collar is secured, may then be inserted in any type of drill and when used will drill only to the depth of the collar as measured and set by the device of the present invention.

Abstract: A depth adjusting system particularly for power-driven screwdrivers comprising an adjustment collar that is releasably fitted to the housing of the tool and a depth locator which screws onto the collar. The adjustment collar has a forward cylindrical portion and an enlarged rearward cylindrical portion that includes a pair of diametrically opposed, axially extending cantilevered spring fingers for detachably connecting the adjustment collar to a circular opening in the housing. The free ends of the spring fingers are provided with a hook and groove that are adapted to engage and mate with a corresponding circumferential groove and rib in the housing opening, thereby permitting relative rotation of the adjustment collar to the housing which serves to set the relative axial position of the depth locator.

Abstract: Disclosed are methods for applying durable markings to wearing surfaces, such as concrete factory floors, roadways, terrazzo or ceramic tile floors, or for imparting particular floor surface qualities, such as providing a non-skid surface. A diamond surface drill bit rotating at, for example, 2500 to 5000 rpm is employed to form dry recesses in the surface, which recess is immediately receptive to adhesive for attaching a premolded insert, or to an insert formed in situ, such as an insert of an acrylic polymer. The disclosed surface drill bit has a cutting end with two general types of diamond-impregnated cutting element segments attached. Attached around the periphery of the cutting end are peripheral gauge cutting element segments of arcuate configuration spaced from each other.

Abstract: The depth minder comprises a drill bit having a shank and an integrally attached flange, with male threads thereon, which has a larger diameter than the shank so that it prevents drilling to a deeper depth than the length of the drill bit beyond the flange. A primary spacer is also used which has female threads to accept the male threads of the flange partially into the top of the spacer, a bottom surface, and a central hole which is large enough to accommodate the largest sized drill bit of a series of bits, thereby further selectively reducing the drilling depth. One or more adaptor spacers of plastic or of metal are additionally used to provide additional options regarding the depth of penetration desired for the drill bit. Such an adaptor spacer is adhesively attached to the bottom surface of the primary spacer or to the lower surface of the flange, thereby providing a range of drilling depths.

Abstract: The device for producing a drilled hole with an undercut includes a drilling tool having a shank and a drilling head faced with a plurality of diamond chips, a drilling tool-holder structured to hold the drilling tool and a rotatable sleeve having an axial throughgoing passage for the drilling tool and the drilling tool-holder and also having a lateral connecting pipe for a cooling and flushing liquid. So that the drilled hole with the undercut can be made in a single working step using the same drilling tool, the shank of the drilling tool (2) is provided with a stop collar (12) and also a cross-sectionally enlarged portion (17). The shank of the drilling tool (2) tapers uniformly toward the drilling head (11) and also tapers uniformly toward the stop collar (12).

Abstract: A drill chips removing device, comprising a sleeve or a ring formed with a through hole at its central portion for axially passing said drill therethrough and provided with a fixing device for fixing the sleeve or the ring to the drill.

Abstract: A guide/drill stop in the form of a hollow one-piece cylindrical sleeve for frictional engagement with a cutting tool, e.g., a drill bit, to regulate the desired depth of a hole to be drilled. The guide/drill stop sleeve extends optionally over the portion of the shank of the drill bit inserted into the collet or chuck of the machine or drill to enable the collet or chuck to secure the positioning of the drill stop during drilling. Alternatively, in another embodiment, the guide/drill stop sleeve may cover only a portion of the drill bit such that the sleeve does not encompass the section of the shank of the drill bit received into the collet or chuck of the particular machine or drill. In general a drill stop, constructed of various materials in various lengths and diameters, to enable precise regulation of drilled holes of varying depth is provided.

Abstract: An apparatus for sampling and collecting wood samples for analysis purposes which includes a boring bit surrounded by a chamber into which the boring bit draws samples and from which the samples are passed to a collection container. The boring bit is housed in a pair of slidably connected housing members which determine the depth that the boring bit enters a wood sample. Collected samples are analyzed for microbial contaminates.

Abstract: A tool for finishing the aperture in the base of a cartridge case. The typical cartridge case has a cylindrical neck and the aperture is located on the axis that extends from the cylindrical neck. A pilot is provided on the shank of an aperture cutting tool coaxial with a cutter on the tool. A limit stop is provided above the pilot and the combination is adjustable and lockable at a desired position on the shank. The combination pilot and limit stop is positioned relative to the cutter so that as the pilot enters the neck, the cutter is guided into the aperture. The stop limit provides the exact amount of cutter entry for removing burrs but without enlarging the aperture.

Abstract: The countersink tool assembly of the present invention is rotatably driven by a conventional drill apparatus and includes an insert having a central aperture and two diametrically opposed ears which extend into the central aperture. A multi-fluted countersink tool is concentrically mounted within the aperture such that the diametrically opposed ears extend into the flutes of the countersink tool at a desired axial location. The ears are adapted to engage and follow the contour of the curved outer wall surface which concentrically surrounds the hole. As such, the countersink tool assembly translates rectilinearly with respect to corresponding changes in the curved contour of the outer wall surface.

Abstract: A controlled depth cartridge case chamfering tool and method for use thereof in firearm cartridge loading and reloading operations, which enables the adjustably set repeatedly uniform taper chamfering of the mouth interior of a sized and trimmed cartridge case to provide a consistently uniform radially aligned and squarely disposed truncated conically shaped gradual taper therewithin and thereby allow for a greater ease of insertion and smoothness of seating of a bullet tip during loading or reloading operations without the otherwise inherent hazard of heel and base marring or damage thereto.

Abstract: Ice auger cutters include a shaft having a handle connected to one end for rotating the shaft about its axis, cutting elements secured to an opposite end of the shaft positioned radially outwardly from the axis, and an adjustable stop coaxially positioned between the cutting elements to control the penetration or feed rate of the cutter according to the density and temperature of the ice and strength of the operator.

Abstract: A drilling apparatus for producing undercut drilled holes and comprising a drill shaft including a bulge portion located between a stop ring mounted on the drill shaft and a drilling head mounted at the free end of the drill shaft, and which narrows towards opposite ends of the drill shaft.

Abstract: A drill for drilling holes in masonry and comprising a depth stop mounted on the drill shank and formed as a resilient anti-vibration element.

Abstract: A fastening element to be driven into a hard receiving material, such as metal, includes a head at its trailing end and an axially extending shank projecting from the head to the leading end with a tip at the leading end. At least an axially extending section of the shank from adjacent the trailing end is threaded. A guide member is in threaded engagement with the shank and is spaced from the head when the fastening element is ready to be driven. The guide member is cup-like shaped with an opening facing toward the leading end. The guide member has a base extending transversely of the axial direction with a conically shaped section projecting radially outwardly from the base and axially toward the leading end. When the fastening element is driven into a receiving material, the guide member moves into contact with the head and is deformed when the driving of the fastening element is braked.