Abstract: A screwdriver tip structure includes a main body provided with an operation end. The operation end is provided with multiple first working sections and multiple second working sections. Each of the first working sections has a convex shape. Each of the second working sections has a concave shape. Each of the first working sections is provided with multiple grooves. Each of the first working sections has a first end and a second end. The second end has a diameter more than that of the first end. Each of the first working sections has a periphery provided with a phantom side face. The side face extends from the second end to the first end. Each of the grooves is provided with a first concave face. The first concave face of each of the grooves includes a first single arc.

Abstract: An orthopedic screw extractor device including a shaft, an end portion about a first end of the shaft for securing to a handle, and a screw extracting tip about a second end of the shaft opposite the first end. The screw extracting tip further includes a generally frustoconical shape having a side at an angle of about 5 to 15 degrees relative to a longitudinal axis of the screw extracting tip. The screw extracting tip further includes first, second and third screw threads and first, second and third flutes circumferentially spaced about the screw extracting tip and extending across an entire length of the screw extracting tip. Each of the screw threads has a lead of about 0.07 to 0.12 inches, a pitch of about 0.02 to 0.04 inches, a thread angle of about 40 to 50 degrees, and a depth of about 0.01 to 0.02 inches.

Abstract: A hex lobular headed bit and socket for efficient torque force application having a hex lobular shaped head and multiple engagement fins each with contoured fastener engagement surface channels defining pairs of omni-directional alternating first and second fastener engagement resistant points. The contoured first fastener engagement channels on the apex of the fins engages the fasteners displacing material imparting enhanced grip while the second engagement channel defines additional surface contact point to prevent slippage therebetween.

Abstract: An extraction device of a platform for holding a blade fitted with an upstream flange, out of a turbomachine rotor disc, and extraction method using the device. The device includes a handle fitted with a radial annular shoulder extended by a threaded pin, a proximal ring and a distal ring having a tube extended by a radial collar and a sleeve. The proximal ring is arranged around the pin, the tapped distal ring being screwed onto the other end of the pin and the sleeve being arranged around the two rings between their respective collars. Screwing of the handle results in moving the distal ring towards the proximal ring, radial deformation of the distal part of the sleeve against the flared part of the cylindrical orifice of the flange and its being joined to the latter. It is possible to conjointly extract the platform and the device from the disc.

Abstract: A locking device (100) is operable to lock a tool (150) in an opening. The locking device includes a base (104) positionable with respect to a lifting member (152) of the tool when a first end of the lifting member is positioned within the opening. The locking device also includes a lift (106) coupled to the base for movement relative to the base. The lift includes an interface portion (110) coupleable to the lifting member such that the lifting member is moveable with the interface portion in an extraction direction of the opening when the lift is moved from a first position to a second position relative to the base.

Abstract: An orthopedic screw extractor device including a shaft, an end portion about a first end of the shaft for securing to a handle, and a screw extracting tip about a second end of the shaft opposite the first end. The screw extracting tip further includes a generally frustoconical shape having a side at an angle of about 5 to 15 degrees relative to a longitudinal axis of the screw extracting tip. The screw extracting tip further includes first, second and third screw threads and first, second and third flutes circumferentially spaced about the screw extracting tip and extending across an entire length of the screw extracting tip. Each of the screw threads has a lead of about 0.07 to 0.12 inches, a pitch of about 0.02 to 0.04 inches, a thread angle of about 40 to 50 degrees, and a depth of about 0.01 to 0.02 inches.

Abstract: A screw bit body which allows for efficient torque force application onto a socket fastener. The screw bit body includes a plurality of laterally-bracing sidewalls, a first base, and a second base. The laterally-bracing sidewalls are radially distributed about a rotation axis of the screw bit body with each further including a first lateral edge, a second lateral edge, a bracing surface, and an engagement cavity. The engagement cavity creates an additional gripping point to prevent slippage in between the screw bit body and the socket fastener. The engagement cavity traverses normal and into the bracing surface. Additionally, the engagement cavity traverses into the screw bit body from the first base to the second base. The engagement cavity is specifically positioned offset from the first lateral edge by a first distance and positioned offset from the second lateral edge by a second distance.

Abstract: A broken bolt extractor is disclosed having a counter clockwise cutting tip section for drilling a bore into a broken bolt, a tap section having counter clockwise orientated threads, an intermediate shaft section, a chuck end portion, and a channel formed in the tip section, the tap section, and the shaft section.

Abstract: A bit for removing damaged screws includes: a shaft portion and a head portion connected to the shaft portion. The head portion includes a tip section, a threaded conical section, and scraping portions extending continuously from the tip section to the threaded conical section. The scraping portions are able to perform continuous and non-stopping scraping operation toward the damaged screw. The scraping portions on the threaded conical section can scrape out a space big enough to allow passage of the threaded conical section, thus reducing resistance when the threaded conical section performs scraping and cutting operation. The threaded conical section can be guided to bite into and unscrew out the damaged screw, right after the scraping operation is performed by the tip section, so that the scraping and unscrewing operation can be performed more smoothly.

Abstract: Methods and apparatus for an asymmetrical fastening system according to various aspects of the present invention include a driver and a fastener that are configured to have corresponding conforming surfaces suitably adapted to provide substantially complete engagement between a torque surface of the driver and a recessed socket area of the fastener. The driver and fastener may each be configured to include a driving surface that is aligned with a longitudinal axis and a removal surface that intersects a radial extending from the longitudinal axis at an oblique angle. The driver and fastener may further include corresponding tapering surfaces that allow the torque surface of the driver to wedge against the recessed socket area of the fastener.

Abstract: A broken bolt extractor is disclosed which comprises a counter clockwise cutting tip section for drilling a bore into a broken bolt, the cutting tip section being tapered, an intermediate gripping section having a gripping edge for gripping a side of the bore drilled into the broken bolt, the intermediate gripping section being tapered, and a shaft section for attachment to a tool for rotating the extractor.

Abstract: An anti-slip fastener driver includes a body portion and a driving portion formed at one terminal end of the body portion. The driving portion includes at least one peripheral face. A contact face is formed at one distal end of the driving portion opposite to the body portion. The contact face is beveled and at an inner included angle less than 90 degrees to the peripheral face. The contact face is adapted to abut against a terminal section of a bottom surface of a socket formed in a fastener to increase the contact area between the socket and the anti-slip fastener driver for providing enough friction to turn the fastener.

Abstract: Disclosed is a tool having a tapered first portion configured to translate a rotational force to the stuck member, a second portion connecting with the first portion and configured to translate the rotational force to the tapered first portion, a planar tip at an end of the first portion and perpendicular to a central axis passing through the first portion and the second portion, a plurality of left-handed splines extending helically around the central axis from the tip toward the second portion, a driver engaged with the second portion and configured to receive a third rotational force from a mechanical manipulator, and a leak seal connected to the driver and configured to form a seal around the stuck member and at least a portion of the driver and prevent gases opposite the stuck member from escaping.

Abstract: The combination of a driver and fastener that allows a user to insert and remove the fastener by applying larger than normal torque loads to it includes: (a) a fastener with a proximal end handle and a distal end head configured to provide a standard indentation and an additional recess that provides additional surface area that allows larger torque loads to be applied to the fastener, (b) a main driver with a shaft having a central bore, a handle at its proximal end and a head at its distal end configured to allow it to be temporarily inserted into the fastener's head, and (c) an awl driver having an awl shaft with an awl handle affixed to its distal end and its proximal end including a tip configured to allow it to pass through the main driver's bore and be brought into contact with the fastener's head where it is used to cut into the fastener cannula so as to temporarily adhere the awl driver to the fastener.

Abstract: A removal tool includes an elongate rod. A first end of the elongate rod is to be connected to and driven by a drive device, and a second end of the elongate rod is connected integrally to the first end. A direction from the first end toward the second end, which is substantially parallel to a longitudinal center axis of the elongate rod, is defined as a first direction. Along the first direction the second end is conically tapered and formed with plural splines which obliquely extend relative to the longitudinal center axis according a twist direction, wherein the twist direction generally conforms to a direction in which the removal tool is used to unfasten a fastener. Each spline has a circumferential surface having plural first teeth which obliquely extend relative to the longitudinal center axis according to the twist direction along the first direction.

Abstract: A removal tool includes an elongate rod. A first end of the elongate rod is to be connected to and driven by a drive device, and a second end of the elongate rod is connected integrally to the first end. A direction from the first end toward the second end, which is substantially parallel to a longitudinal center axis of the elongate rod, is defined as a first direction. Along the first direction the second end is conically tapered and formed with plural splines which obliquely extend relative to the longitudinal center axis according a twist direction, wherein the twist direction generally conforms to a direction in which the removal tool is used to unfasten a fastener. Each spline has a circumferential surface having plural first teeth which obliquely extend relative to the longitudinal center axis according to the twist direction along the first direction.

Abstract: A bit for removing a broken fastener comprises a tip from which extend two or more notches separated by traction or biting surfaces formed from two-sided frusto-conically-shaped regions. The surfaces are bounded on one side by a nonlinear cutting edge and on the other side by a non-cutting edge and are configured to cut into the fastener when the bit is rotated in a direction opposite to the fastener's direction of engagement. Specific embodiments include configurations where the cutting edges extend at different angles with respect to the bit axis, where the biting surfaces comprise a plurality of serrations, and where the cutting edges are separated by flutes which spiral along a longitudinally extending periphery of the bit.

Abstract: A damaged fastener extractor is provided with a body defining generally cylindrical coordinates ?, Z and R about an axis and having a rear body portion communicating with a front body portion. The rear body portion has an outer surface shaped to be engaged by a tool to be used in rotating the body circumferentially about the axis and sized to present a working outer dimension OD to said tool. The front body portion has a front terminus and an inner surface in which the front terminus is oriented substantially perpendicular to the axis and provides a generally circular receiving aperture communicating with the inner surface. The inner surface is shaped to engage a damaged fastener to be extracted and sized to present a working inner diameter ID to the damaged fastener.

Abstract: A screwdriver blade and method for driving a conventional screw having a single transverse slot is disclosed. The driver blade has an elongated body having a central longitudinal axis and a tip. The tip has a distal end in the form of a planar end face that is arranged to engage the bottom surface of the screw's slot. The end face includes a sharply tapered symmetrical spike projecting outward from it along an axis parallel to the central longitudinal axis of the blade. The spike is arranged to dig into the material of the screw at the bottom surface of the screw's slot to prevent slippage of the tip within the slot and without marring the appearance of the slot.

Abstract: For certainly handling a screw member, a screw member 1 includes a male screw 2, and an inner peripheral face of the hole 4 has an engaging recessed part 5 to be engaged with an engaging projected part 11 of a tapered engaging part 10 of a rotary tool 9, and a stepped part 6, said inner peripheral face is parallel or make close to a center axis 7 of the screw member 1 from the head part 3 in a direction of the male screw and from the stepped part 6 in the direction of the male screw, and head part side end edge 8a and an end edge of the stepped part 8b to be engaged with the engaging projected part 11 have an angle of said inner peripheral face being 90±5 degrees with respect to the head part 3 and the stepped part 6.

Abstract: A bit for removing a broken security fastener having an elongated shaft with a longitudinal axis. The shaft has a first end and a second end. The first end terminates in a tip region having a recess for receipt of the post of the security fastener, the recess being disposed substantially along the longitudinal axis. The second end of the shaft is configured to be received by the chuck of a tool which provides rotational torque.

Abstract: A prior art sucker rod tong is improved to remove a coupling completely from a sucker rod assembly comprising sucker rods joined end to end by couplings. The prior art sucker rod tong has a rotatable jaw assembly and a lower backup wrench adapted to cooperate to unscrew a coupling joining first and second rods, where the coupling remains screwed to the second rod after it is unscrewed from the first rod. The improvement comprises a coupling extractor for unscrewing the coupling from the second rod so that the coupling can be replaced. The coupling extractor comprises a shaft having an extractor end portion on each end of the shaft and a shield around each extractor end portion, wherein the coupling extractor is designed and sized to fit within and to be rotated by the jaw assembly. The extractor end portion engages the inside wall of the coupling to unscrew the coupling from the second rod. The extractor end portion is preferably a tapered, left-handed spiral fluted easy-out extractor.

Abstract: An extractor tool for Torx brand and other fluted fasteners comprising an end section for engaging a fastener opening comprising six equally spaced, uniformly sized, pitched flutes separated by uniform depth grooves located at the end of a shank with a cylindrical connecting section joined thereto, in turn, joined to an impact drive end of the shank. The fluted end section has a frusto-conical configuration with the narrow dimension of the fluted end section at the distal end of the tool and wherein the distal end has a flat surface transverse to the longitudinal axis of the shank.

Abstract: A bit for removing a broken security fastener having an elongated shaft with a longitudinal axis. The shaft has a first end and a second end. The first end terminates in a tip region having a recess for receipt of the post of the security fastener, the recess being disposed substantially along the longitudinal axis. The second end of the shaft is configured to be received by the chuck of a tool which provides rotational torque.

Abstract: A bit for removing a broken fastener comprises a tip from which extend two or more notches separated by traction or biting surfaces formed from two-sided frusto-conically-shaped regions. The surfaces are bounded on one side by a nonlinear cutting edge and on the other side by a non-cutting edge and are configured to cut into the fastener when the bit is rotated in a direction opposite to the fastener's direction of engagement. Specific embodiments include configurations where the cutting edges extend at different angles with respect to the bit axis, where the biting surfaces comprise a plurality of serrations, and where the cutting edges are separated by flutes which spiral along a longitudinally extending periphery of the bit.

Abstract: A tool for removing conventional one way fasteners that includes, generally, a member, a collar, and, a shaft that can be removably received by the collar, wherein in the shaft is configured to engage regions of the fastener head. The collar is adjustable to fit fastener heads of different sizes. The member can be configured to correspond to a threaded portion of the outer surface of the collar. The collar may also have a bottom portion that includes multiple splines.

Abstract: A prior art sucker rod tong is improved to remove a coupling completely from a sucker rod assembly comprising sucker rods joined end to end by couplings. The prior art sucker rod tong has a rotatable jaw assembly and a lower backup wrench adapted to cooperate to unscrew a coupling joining first and second rods, where the coupling remains screwed to the second rod after it is unscrewed from the first rod. The improvement comprises a coupling extractor for unscrewing the coupling from the second rod so that the coupling can be replaced. The coupling extractor comprises a shaft having an extractor end portion on each end of the shaft and a shield around each extractor end portion, wherein the coupling extractor is designed and sized to fit within and to be rotated by the jaw assembly. The extractor end portion engages the inside wall of the coupling to unscrew the coupling from the second rod. The extractor end portion is preferably a tapered, left-handed spiral fluted easy-out extractor.

Abstract: A device to extract a fastener from a workpiece. The device includes a shaft having first and second end portions and, a cutting end tool adapted to engage and bore into the fastener as the shaft is rotated, a drill bit portion proximal to the cutting end tool and adapted to engage and bore into the fastener, and a socket disposed about the shaft and a collet collar disposed about the socket.

Abstract: A tool for removing conventional one way fasteners that includes, generally, a member, a collar, and, a shaft that can be removably received by the collar, wherein in the shaft is configured to engage regions of the fastener head. The collar is adjustable to fit fastener heads of different sizes. The member can be configured to correspond to a threaded portion of the outer surface of the collar. The collar may also have a bottom portion that includes multiple splines.

Abstract: A prior art sucker rod tong is improved to remove a coupling completely from a sucker rod assembly comprising sucker rods joined end to end by couplings. The prior art sucker rod tong has a rotatable jaw assembly and a lower backup wrench adapted to cooperate to unscrew a coupling joining first and second rods, where the coupling remains screwed to the second rod after it is unscrewed from the first rod. The improvement comprises a coupling extractor for unscrewing the coupling from the second rod so that the coupling can be replaced. The coupling extractor comprises a shaft having an extractor end portion on each end of the shaft and a shield around each extractor end portion, wherein the coupling extractor is designed and sized to fit within and to be rotated by the jaw assembly. The extractor end portion engages the inside wall of the coupling to unscrew the coupling from the second rod. The extractor end portion is preferably a tapered, left-handed spiral fluted easy-out extractor.

Abstract: A tool head structure is used to screw a regular screw or a damaged screw and comprises two cutting portions located at the center of the front portion thereof. Between the two cutting portions is formed a ridge line, and behind the two cutting portions are formed two concave flank portions, and the respective flank portions are correspondingly linked up with scraping grooves. By such arrangements, the tool head structure can solve the problems of easy slipping and being unable to remove the damaged screw.

Abstract: A tool for removing and applying a fastening device from and to a threaded stud is provided. The tool includes an elongated chamber and a retainer having a pair of spaced apart portions configured to hold fastening devices within the chamber. The tool further includes a positioning mechanism for positioning stored fastening devices for later installation onto the stud. In one embodiment, the retainer includes a worm gear. Opposing portions of the catch of the worm gear hold the fastening device. The positioning mechanism includes a cam assembly configured to rotate the shaft wherein the rotary movement of the shaft is translated into an axial movement of the fastening device within the chamber. In a second preferred embodiment, the retainer includes a pair of keepers configured to hold a fastening device. The positioning mechanism is operable to feed a fastening device into the keeper.

Abstract: A device 100 to extract a fastener 102 from a workpiece 104 wherein the fastener 102 has a predetermined direction of engagement with the workpiece 104, includes a shaft 106 having first and second end portions 108 and 110, cutting end tool 112 adapted to engage and bore into the fastener 102 as the shaft 106 is rotated, a drill bit portion 114 proximal to the cutting end tool 112 and adapted to engage and bore into the fastener 102, and cutting threads 116 that penetrate the fastener 102 a predetermined distance while the drill bit portion 114 bores into the fastener 102 at a relatively “slow” speed, whereby the cutting threads 116 secure the shaft 106 to the fastener 102 and promote the rotation of the fastener 102 contrary to the fastener's 102 direction of rotational insertion into the workpiece to ultimately remove the fastener 102 from the workpiece 104.

Abstract: A tool head structure is used to screw a regular screw or a damaged screw and comprises two cutting portions located at the center of the front portion thereof. Between the two cutting portions is formed a ridge line, and behind the two cutting portions are formed two concave flank portions, and the respective flank portions are correspondingly linked up with scraping grooves. By such arrangements, the tool head structure can solve the problems of easy slipping and being unable to remove the damaged screw.

Abstract: Provided according to the invention is a fastening tool (10) for tightening/untightening screw threaded fasteners such as bolts or nuts (18). The bolts (18) comprise a head formed with a series of at least three cavities (18a) deployed therearound. The fastening tool (10) comprises at least three peanut-shaped displaceable locking bodies (16) having spherical portions (16a; 16b), and a restricted neck portion (16c) therebetween. The cavities (18a) of the bolt (18) are configured to receive the spherical portions (16b). A seat member (12) is provided, formed with a series of at least three cavities (22) configured to receive the spherical portions (16a). Further provided is a manipulator (14) for rocking the locking bodies (16) about their neck portions (16c) from a non-operative position wherein the spherical portions (16a) are seated in the cavities (22), into an operative position wherein the spherical portions (16b) are seated in the bolt cavities (18a), and vice versa.

Abstract: A fastener impact driver device includes a fastener engagement member having a plurality of projections disposed about a lower portion that engages a corresponding peripheral portion of a fastener. The device further includes a positioning member having an upper portion that ultimately receives a force thereupon, and a lower portion that engages a cooperating upper portion of the fastener engagement member whereby a force such a hammer strike is imparted upon the upper portion of the positioning member to drive the projections of the fastener engagement member into the head of the fastener without damage of the fastener engagement member, whereupon the positioning member is removed from the fastener engagement member and a hand tool is removably secured to the fastener engagement member to impart rotary motion to the member and the fastener thereby removing the fastener from or urging the fastener into a workpiece.

Abstract: A bit for removing a broken fastener comprises a tip from which extend two or more notches separated by scraping surfaces formed from two-sided frusto-conically-shaped regions. The scraping surfaces are bounded on one side by a cutting edge and on the other side by a non-cutting edge and are configured to cut into the fastener when the bit is rotated in a direction opposite to the fastener's direction of engagement. Specific embodiments include configurations where the cutting edges extend at different angles with respect to the bit axis and where the scraping surfaces comprise a plurality of serrations.

Abstract: A fastener extractor and a method of extracting a fastener are provided. The fastener extractor includes a shaft, an engagement end at a distal end of the shaft and an attachment end at a proximal end of the shaft. The engagement end includes a plurality of helical ridges and grooves. The attachment end extends axially from the shaft and includes a hexagonal cross-sectional portion adapted to engage an extraction tool. Adjacent ones of the plurality of the grooves form the ridges therebetween and the plurality of ridges is adapted to engage a pre-formed opening in a fastener to be removed.

Abstract: An extraction tool (20) for extracting spiral threaded inserts includes an elongated basic body (23, . . . , 26), on the one end of which an extracting tip (28) narrowing toward the front and intended for being inserted with a cutting action into the threaded insert to be extracted is provided, and on the other end of which a device (23) for turning the extraction tool (20) about the tool longitudinal axis is provided. In the case of such an extraction tool, extraction of the threaded inserts through inspection ports is made possible in a simple and reliable manner by virtue of the fact that at least a section of the extracting tip (28) has the shape of a steep-angle truncated pyramid (28.1).

Abstract: A screw and a screwdriver of the present invention provide an easy insertion of screwdriver bits and the screwdriver conveys a large torque when fastening so that the screwdriver does not rise up from the screw and does not damage recesses to fasten and loosen the screw. The screw has a high strength structure for shear force. A plurality of recesses for the insertion of the bits of the screwdriver are disposed on a top face of a screw head of the screw. Engaging walls are disposed to engage with the bits between the recesses. The whole shape of the recesses has a tapered cross section. Vertical engaging faces are formed inside the recesses near an outer circumference in a fastening direction of the screw and extend to a thickness direction of the screw head. The vertical engaging faces are parallel to bisectors of the width of the engaging walls through a central axis. The screwdriver has the bits having the same shape as the recesses of the screw head with respect to the central axis.

Abstract: A fastener impact driver device 10 includes a fastener engagement member 12 having a plurality of projections 14 disposed about a lower portion 16 that engages a corresponding peripheral portion 18 of a fastener 20. The device 10 further includes a positioning member 22 having an upper portion 24 that ultimately receives a force thereupon, and a lower portion 26 that engages a cooperating upper portion 28 of the fastener engagement member 12 whereby a force such a hammer strike is imparted upon the upper portion 24 of the positioning member 22 to drive the projections 14 of the fastener engagement member 12 into the head 44 of the fastener 20 without damage of the fastener engagement member 12, whereupon the positioning member 22 is removed from the fastener engagement member 12 and a hand tool is removably secured to the fastener engagement member 12 to impart rotary motion to the member 12 and the fastener 20 thereby removing the fastener 20 from or urging the fastener 20 into a workpiece.

Abstract: A screw and driver system includes a range of screws and a driver. Each screw has a head having a driving recess in its surface for engagement by the driver. The recess of larger screws in the range have a plurality of superimposed recess tiers of decreasing size with increasing depth from said surface. Each tier has substantially parallel driving surfaces and torque applied to the driver is transmitted to the screw through the driving surfaces. At least one tier of at least smaller screws in the range has a rib. Engagement of the driver with the recess causes deformation of rib, and hence creation of an interference fit of the driver in the recess.

Abstract: A bit for removing a broken fastener comprises a tip from which extend two or more notches separated by scraping surfaces formed from two-sided frusto-conically-shaped regions. The scraping surfaces are bounded on one side by a cutting edge and on the other side by a non-cutting edge and are configured to cut into the fastener when the bit is rotated in a direction opposite to the fastener's direction of engagement. Specific embodiments include configurations where the cutting edges extend at different angles with respect to the bit axis and where the scraping surfaces comprise a plurality of serrations.

Abstract: A fastener extractor is provided that includes an attachment end having an attachment means for connection to an extraction tool and a receiving end. The receiving end has an interior bore that angles inwardly towards the attachment end. The interior bore has a central axis and includes at least two arcuate grooves that extend along the interior bore towards the attachment end. The arcuate grooves curve radially and inwardly towards the central axis of the interior bore, with adjacent arcuate grooves forming sharp helically shaped ridges. A transition area is positioned between the attachment end and the receiving end and has a plurality of arcuate surfaces. Each of the plurality of surfaces corresponds to each of the arcuate grooves and projects inwardly from the corresponding groove towards the central axis. The interior bore is engageable over a fastener to be extracted.

Abstract: A device for the extraction of broken fastener comprises a left handed cutting tool juxtaposed to a left handed drill bit that is surrounded by a socket. In a specific embodiment the socket has longitudinal slits, a ribbed inner surface, and a threaded outside surface adapted to be received by a collar.

Abstract: The invention concerns a tool for removing fastening members, such as nuts and studs. The tool comprises an elongate body member (30) with first and second ends, the first end having means (31′) for deforming an end face of the fastening member to provide an area of purchase thereon; and means (44) to cause rotation of the fastening member to unscrew the fastening member from the structure. Also within the scope of the present invention is a locating means (38′) for locating the first end of the body member (30′) with respect to the end face of the fastening member as well as a method for enabling removal of fastening members by action upon an end face of a fastening member.

Abstract: A double-ended hexagonal shank tool bit for extracting Phillips head or similar screws with damaged heads. One end of the tool shapes the screw head recess to a flared opening. The other end of the tool is tapered with left-hand screw threads and diametrically opposite longitudinal gashes arranged to enable the tool to engage the sides of the shaped recess and remove the screw.

Abstract: An anti-skip fastener tightening and/or extraction device 10 includes a tool bit end 12 having a plurality of flutes or crossing members 13-16, each crossing member having at least one recess 18 and 26 positioned in a side wall 20,21,28 and 29. The recesses 18 and 26 form edges 36 and 42 that engage corresponding portions of a fastener 17 to maintain engagement between the tool bit end 12 and the fastener 17 when forcibly rotating the fastener 17 to drive the fastener 17 into a workpiece or forcibly rotating the fastener 17 to extract the fastener 17 from a workpiece.

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 fastener extractor is provided that includes an attachment end having an attachment means for connection to an extraction tool and a receiving end. The receiving end has an interior bore that angles inwardly towards the attachment end. The interior bore has a central axis and includes at least two arcuate grooves that extend along the interior bore towards the attachment end. The arcuate grooves curve radially and inwardly towards the central axis of the interior bore, with adjacent arcuate grooves forming sharp helically shaped ridges. A transition area is positioned between the attachment end and the receiving end and has a plurality of arcuate surfaces. Each of the plurality of surfaces corresponds to each of the arcuate grooves and projects inwardly from the corresponding groove towards the central axis. The interior bore is engageable over a fastener to be extracted.