Abstract: A tool capable of selectively coupling to a fastener.

Abstract: A screw positioning sleeve assembly comprises an inner sleeve slideably received in an outer sleeve, so that the inner sleeve can be engaged with an ordinary tool rod or a screwdriver to screw or unscrew a screw. When screwing or unscrewing, a magnet in the outer sleeve can attract the screw. During the screwing and unscrewing process, the positioning sleeve can move towards the screw to make the magnet keep attracting the screw, thus preventing the screw from screwing or unscrewing falling off. It is noted that the rod body of the tool rod or the screwdriver can connect with the screw positioning sleeve assembly without any additional preformed structure. Therefore, the scope of applicability of the screw positioning sleeve assembly is enlarged considerably.

Abstract: A rotary tool includes a tool holder, a reversible bit, and an outer sleeve. The tool holder includes a socket and a shank. The socket includes an opening extending rearwardly from an end thereof. The shank is integral with and extends rearwardly from the socket and includes a non-circular cross-section. The reversible bit includes an inner sleeve, a first reversible bit driver, and a second reversible bit driver. The inner sleeve is disposed within the socket and rotates with the tool holder. One of the first and second bit drivers contains a bit having an end extending axially out of the socket opening. The outer sleeve is disposed over the socket and includes a first end having an opening. The bit end extends outwardly beyond the outer sleeve opening a distance equal to a desired depth of a drywall dimple.

Abstract: A fastener placement system for placement of screws into bone structure during a medical procedure comprises a power driven screw driver, a fastener carrier system with a series of fasteners temporarily attached thereto and an elongated band structure carried by the fastener carrier system for positioning and advancing the individual fasteners of the series of medical fasteners in a controlled manner to a position to receive a driving tip on the powered screw driver. The head of the fastener and the tip of the screw driver have complementary structures which allow the screw head to be simultaneously grasped by the driver tip and the fastener to be driven in a rotary manner for placement into the bone structure.

Abstract: A tool assembly comprising a handle having first and second sides, first and second ends, and a channel portion. A resiliently biased driver assembly is movably retained within the handle. The driver assembly can be activated from a closed condition to an open condition by pressing a button.

Abstract: An apparatus includes a rotatable device, which may be a keyless chuck, a keyless chuck adapter, a collet chuck, a collet adapter, a set screw bit retaining chuck, or a set screw bit retaining adapter. The rotatable device is configured to be mounted to a power tool for rotational driving of the rotatable device. The rotatable device is configured to receive a first bit device detachably mounted in the rotatable device for powering rotational movement of the first bit device. A generally cylindrical mounting section is defined on the rotatable device, which is capable of being rotatably driven by the power tool. The generally cylindrical mounting section includes at least one locking mechanism on it. The generally cylindrical mounting section is adapted for insertion in and engagement with a bit holding attachment.

Abstract: A hexagonal spanner having an L shape comprises a short driving portion having a groove at one distal end thereof; and a first tightening unit enclosing around the groove of the short driving portion; an outer diameter of the first tightening unit being greater than a maximum diameter of the short driving portion; and a long driving portion having a groove at one distal end thereof; and a second tightening unit enclosing around the groove; an outer diameter of the second tightening unit being greater than a maximum diameter of the long driving portion.

Abstract: A hexagonal spanner has two ends, one end being a long driving end and the other end being a short driving end; the long driving end having a threaded hole for receiving a threaded rod; and the threaded hole being formed near an end portion of the long driving end; two ends of the threaded rod can be engaged to a screw driver; the threaded rod can be driven to protrude from the threaded hole so as to enlarge the size of the long driving end and the long driving end can fit a size of the threaded groove of a screw unit. The threaded hole penetrates through the long driving end. A length of the threaded rod is equal to that of the threaded hole. The short driving end is formed with another threaded hole and another threaded rod is inserted into the threaded hole of the short driving end.

Abstract: An attachment (10) for use with a power tool (12) which can conveniently convert a rotatable chuck (14) or adapter (78) used with a first bit device (22) to usage with a second bit device (36) and vice versa. Either first or second bit device can be used for drilling, fastener driving or for other operations, however the preferred configuration is use with a first bit device for drilling pilot holes and a second bit device for driving of a fastener into the freshly drilled pilot hole. The attachment (10) is easily detachably securable with respect to any chuck (14) or adapter (78) which has a rotating cylindrical surface (18) with a locking aperture (20) therein. A capping ring (52) may be positioned in an annular slot (42) to retain a resilient member (48) positionable within an annular groove (40) for facilitating biasing of a locking pin (44) into a locking aperture (20) on the rotatably driven cylindrical mounting surface (18).

Abstract: The present invention relates to an orthopedic screw and a corresponding screw driver wherein the screw has a torque driving head with a rounded side a spherical wall for multiaxial use, a self starting, self tapping insertion tip and a threaded portion including a cancellous thread. The threaded portion has a major diameter defined by a spiraling thread and a minor diameter. The head is joined to the threaded portion by an area of from about 2 to about 6 turns of the thread along the longitudinal axis in which the minor diameter tapers by an angle of from about 4° to about 12° and the major diameter of the screw remaining substantially the same. The screw includes a multilobe torque driving recess joined to a cylindrical recess that corresponds to a cylindrical post on the torque driver so as to form a press fit which acts to self-center the screw, to help avoid stripping of the screw/driver interface and to hold the screw in place on the torque driver prior to implantation.

Abstract: One embodiment of the anti-slip slot screw driver having fins 18 which are perpendicular and on opposite sides of the slot driver 14 disallowing lateral slipping from the screw 22 and lateral alignment of the screw 22 in the work piece 10.

Abstract: A sleeve for retaining a fastener against a driver bit includes a resiliently flexible shaft sleeve for frictional engagement against a driver shaft. A lower sleeve is provided having an inner diameter size for engagement over and around the head of a fastener.

Abstract: A screw head and screwdriver for use in combination are provided to reduce the occurrence of stripping a screw head during tightening or removing the screw. The head slot employs slot walls that indent in some portion of the wall, the indent portion forming a ledge under which the screwdriver tip may be retentively captured thereby preventing the tip from lifting from the screw slot and stripping the screw head. The screw slot and driver also generally employ a tapered form, such that the slot widens from a central portion out to the outer circumferential edges. The narrow portion of the slot matching in form a narrow portion of the driver tip such that the driver tip tends not to slide off the screw head during use. Utilizing these inventive design concepts prevents the screwdriver tip from slipping off the head and resulting in the need to apply less downward pressure.

Abstract: A tool for operating a subterranean utility valve having limited accessibility includes a hollow housing with a plurality of elongated members mounted for sliding movement within the housing. Each elongated member is movable in a direction away from the first open end of the housing for placement about a valve nut of such utility valve. A handle is connected to the housing for biasing elongated members for engagement with such valve nut and for generating a torque enabling rotation of such valve nut in order to control flow through such utility valve. A rigid member is connected to plurality of elongated members for retaining and remotely moving them within the hollow housing.

Abstract: The installation tool for a mushrooming expandable anchor has a hollow cylindrical sleeve with an inside diameter, the top having slots for engaging the base of the mushrooming component and a means for engaging and turning a threaded component, which compresses the mushrooming component. The means for turning the threaded component can be a socket, which rotates inside of the sleeve and engages a hex head at the base of the threaded component or alternatively the means for turning the threaded component can be a threaded rod for threading into the base of the threaded component until it reaches the end of the threads in the base. Another means of turning the threaded component is a screwdriver engaging a slot in the treaded component. All of the means for turning the treaded component may be by a powered drill with a connective adapter.

Abstract: A rotary tool includes a tool holder, a reversible bit, and an outer rotatable sleeve. The tool holder includes a socket and a shank. The socket includes an opening extending rearwardly from an end thereof. The shank is integral with and extends rearwardly from the socket and includes a non-circular cross-section. The reversible bit includes an inner sleeve, a first reversible bit driver, and a second reversible bit driver. The inner sleeve is disposed within the socket and rotates with the tool holder. One of the first and second bit drivers extends axially out of the socket opening. The outer rotatable sleeve is disposed over at least a portion of the socket and the bit driver extending axially out of the socket opening. The outer rotatable sleeve further includes a magnet in an end proximate the bit driver extending axially out of the socket opening.

Abstract: A screw fastener assembly includes a resilient sleeve sleeved on a head portion of the screw fastener in a close-fitting manner such that a free end of a shank portion of the screw fastener extends outwardly of a first end of the sleeve. The sleeve permits extension of a bit of a screw driver thereinto via a second end thereof, and is sleeved on the screw driver in a close-fitting manner. An engaging groove in the head portion of the screw fastener engages the bit of the screw driver such that the screw driver is capable of moving and rotating an assembly of the screw fastener and the sleeve until the first end of the sleeve comes into contact with a surface of an object so as to allow movement of the screw fastener relative to the sleeve and a threaded hole in the object.

Abstract: Provided is a bit holder device which is capable of driving a screw into a workpiece, while holding the screw having a groove in which a bit body is inserted, and which makes it possible to change the bit body without removing it from a chuck of an electric tool, etc. A bit holder device facilitating the attachment and detachment of a cylindrical body is also provided. A bit holder device for driving a screw, while holding the screw against detachment from a bit body with retaining a state where an end of the bit body is inserted in a groove on a head of the screw, has a cylindrical cover member removably fitted about the bit body from the end of the bit body, the cover member has an end including a magnetic attracting portion for magnetically attracting the head of the screw, and the bit body protrudes from the end of the cover member.

Abstract: Provides is a screwdriver-and-nut wrench-combined tuning tool for radio frequency filter which is capable of preventing a movement of a tuning screw occurred when locking it with a tuning nut by making their combined body, preventing a difficulty of tuning resulted due to a separate use of a screwdriver and a nut wrench when a space for access to a tuning unit is not sufficient, and minimizing an interruption of turns of the tuning screw and the tuning nut by locking or turning the screwdriver and the nut wrench independently. The screwdriver-and-nut wrench-combined tuning tool for radio frequency filter comprises a case, a nut wrench positioned to rotate inside the case for turning or holding a tuning nut, a screwdriver positioned to rotate inside the nut wrench for turning or holding a tuning screw, a nut wrench locking unit that is fitted to the nut wrench or the case for locking the nut wrench; and a screwdriver locking unitthat is fitted to the case for locking the screwdriver.

Abstract: A threaded screw fastener is provided with a head portion that has integrally incorporated therein dual drive structure whereby the single threaded screw fastener can be rotatably driven by alternative rotary drive socket implements or tools, such as, for example, hexagonally configured or Phillips head configured drive tools or implements, or a combination drive tool. A drive socket implement or tool also has integrally incorporated therein both hexagonally configured drive structure, Phillips head drive structure, and domed contour structure for not only structurally engaging both the hexagonally configured structure and the Phillips head structure integrally incorporated upon the head portion of the threaded screw fastener, but in addition, accommodates the low profile domed structure of the head portion of the threaded screw fastener.

Abstract: A magnetic device for attracting and retaining a fastener which has a bit, a generally ring-shaped keeper having a bottom surface, at least some portion of which bottom surface is magnetized, at least one pair of magnets, each pair of magnets having two magnets with alternating poles, adjacent to the magnetic bottom surface of the keeper and arranged around the bit such that an even number of magnets with alternating poles is arranged around the bit, and a non-magnetic holder that secures the keeper and the magnets and surrounds the bit. The magnets provide magnetic flux to the keeper and the fastener. Each pair of adjacent magnets provides a closed magnetic flux path through a first magnet of the pair, the keeper, a second magnet of the pair, and the fastener. The location of the magnetic device along the bit may be adjustable or fixed.

Abstract: A cordless screwdriver, having a housing (12, 18) equipped with a handle (14), having an in particular permanently installed rechargeable battery (40), and having a transmission (72), is particularly compact, lightweight, and strong because the transmission (72), embodied in the form of a sun-and-planet gear, is simply inserted into a hollow, cylindrical transmission housing (18) and can be secured in position in it by an axial securing plate (62); the transmission housing (18) is also provided with an internal gearing and serves as the sun gear as well as being integrated into the reinforcing structure of the cordless screwdriver (10).

Abstract: A driving tool includes a driving shank having a handle for rotating the driving shank and having an engaging hole formed by two or more spring blades for receiving a fastener, and an actuating device for actuating the spring blades to move radially inward and to force and grasp the fastener to the driving shank, for preventing the fastener from being disengaged from the driving tool inadvertently. The actuating device may include a barrel slidably engaged onto the driving shank for moving the spring blades to grasp the fastener to the driving shank with such as an inclined engagement. A control ferrule may be used to move the barrel relative to the driving shank.

Abstract: A combination fastener driver and fastener, the fastener driver including a generally hourglass-shaped tip which flares from the shank to the tip and the fastener includes a generally hourglass-shaped slot in the fastener head with under cut side walls. The flared walls of the driver tip engage the undercut side walls of the fastener slot to lock the tip in the slot when driving the fastener. A waist portion in the driver tip engages a waist portion in the fastener slot to prevent the tip from laterally slipping out of the slot during use.

Abstract: The golf spike removal tool includes a primary shank with opposite proximal and distal ends. A handle is secured to the proximal end of the primary shank and projections extend from the distal end of the primary shank for engaging apertures in a golf spike. A supplemental shank is telescoped relative to the primary shank and can be releasably engaged in either a first position or a second position with respect to the primary shank. The supplemental shank includes an array of sharply pointed teeth at the distal end thereof. The teeth project distally beyond the primary shank when the supplemental shank is in the distal position.

Abstract: A screw positioning device for a screwdriver comprises a connecting rod assembly, a screw positioning sleeve and a magnetic member. The screw positioning sleeve is axially defined with a slide hole for insertion of an end of the connecting rod assembly, the magnetic member is installed on inner peripheral surface of a front end of the screw positioning sleeve, the screw positioning sleeve is axially positioned at the end of the connecting rod assembly, and the positioning sleeve can move back and forth a predetermined distance with respective to the connecting rod assembly.

Abstract: A tool for installing threaded parts with lock nuts onto a machine is disclosed. The tool includes an outer tube and an inner mechanism that rotate together or independently using cogs. When the outer tube and inner mechanism rotate together, the threaded part is tightened onto a machine. When the outer tube and inner mechanism rotated independently, the lock nut is tightened onto the threaded part.

Abstract: A slip-resistant magnetic sheath includes a hollow sleeve that can be fit onto the screwdriver's shank. A magnetic part positioned at least on one end of the hollow sleeve, provides auxiliary attraction to improve the connection between the shank and the screw with a fastening rim and groove set correspondingly on the sleeve of the magnetic sheath and the shank. The groove allows the fastening rim to move within a pre-set distance so that the magnetic sheath can slide within certain distance and not fall off the shank. The invention installed on an electrical screwdriver can effectively address the slipping problem caused by shocking. The forceful magnetic attraction of the magnetic sheath can prevent the screws from slipping and therefore improve working efficiency.

Abstract: The present invention relates to an extension rod assembly for a screw driving tool, which includes a base, a slide sleeve, a rear compression spring, a front compression spring, a fixing ring and a magnetic iron. The rear and front compression springs are disposed in the slide sleeve. When pushing the slide sleeve toward the tool head, the magnetic iron at end of the slide sleeve can provide a magnetic force to make the tool head pick up a screw to be screwed easily, besides, when pushing the slide sleeve toward the rod, the tool head will be caused to slide out of the slide sleeve, so as to facilitate replacement of the tool head.

Abstract: The invention relates to an instrument system for pedicle screws having a thread in their head which has a clamping screw in the direction of their screw axes, which can be actuated by a power screw driver, with holders for the absorbing of a torque contacting the head of the pedicle screw in a shape matched manner. Since the holders have a tubular part which is coordinated with its inner diameter to the guiding of the clamping screw and with centring parts being able to be fastened in the heads of the pedicle screws instead of the clamping screws, said pedicle screws being engageable when the holder is mounted on, the contact to the inserted pedicle screw can also be maintained with a non visible, i.e. smaller operation field, in order mount the same holder or other holders a plurality of times.

Abstract: Disclosed is an insulated magnetic screwdriver, including a shank having a tip at an end or each end thereof and a peripheral groove formed around a central portion thereof so that the central portion of the shank has a diameter smaller than that of each end thereof, a handle having a locking recess into which the shank is fitted and fixedly or detachably locked thereto, an insulator mounted rotatably around the peripheral groove of the shank while having the same circumference to the shank; and a cylindrical magnet mounted around the peripheral groove of the shank to have the same circumference to the shank while being positioned at an end or each end of the insulator to magnetize the tip. Practically, a current-charged screw in a deep narrow hole can be easily loosened or firmly tightened by means of the inventive screwdriver, without the risk to electric shock.

Abstract: A device for rotating with a rotatable first member includes a second member having a portion engageable with the first member. The portion has a first part and a second part which is resiliently biased away from the first part. The second member tightly engages the first member. There may be a device for measuring rotation of the shaft such as a potentiometer. The rotation measuring device may include an electrical connector for the potentiometer including a socket and a post which is pressable into the socket. The device may also include a rotationally adjustable connector. There may be a coupling connected to the second member which includes a third member with a portion having n sides and a fourth member with a portion having n sides which receives the portion of the third member in a mating relationship, thereby allowing the device to be adjusted to a total of at least m.n rotational positions.

Abstract: A key for operating a security fastener having a lock pattern includes a retractable key pattern. The key pattern has an operational extension position in which the key pattern is enabled for substantial engagement with a security fastener having a matching lock pattern, thereby allowing operation of the matching security fastener. The key pattern is also capable of retreating a non-operational retraction position in which the key pattern is not capable of substantial engagement with a security fastener having a non-matching lock pattern, thereby preventing operation of the non-matching security fastener.

Abstract: This invention relates generally to systems for the internal fixation of bone fractures, and particularly, to equipment associated with the insertion of intramedullary fracture fixation devices such as those used in the treatment of long bone fractures, such as for example fractures of the femur, tibia, humerus, etc. An implant assembly device of the present invention may comprise a handle, a shaft with a first end and a second end, and an elongated rod extending from the shaft. The first end of the shaft is connected to the handle and the second end of the shaft is configured to engage the head of a connecting screw. The device can be held with one hand while the various components are placed one by one into their proper position onto the rod, leaving the other hand free to manipulate the other components.

Abstract: A friction stir rivet is rotated and driven through a first fusible workpiece into an engaged second fusible workpiece, causing local portions of the first and second workpieces to plasticize. A slideable cap contacts the exposed surface of the first workpiece shortly after the process begins. The contact causes the cap to act as a retaining element, limiting the escape of plasticized material from stir site. Once the rivet is driven into the first and second workpieces, rotation ceases and the plasticized material hardens around the rivet. A weld is thus created, joining the workpieces and encompassing the rivet, which provides additional mechanical strength.

Abstract: A locking screwdriver which engages and locks to the head of a screw preventing unseating of the screwdriver from the screw during screw removal and firmly holding and guiding self-tapping screws during their placement.

Abstract: A combination electrician's tool which is substantially a pair of pliers having a first plier portion pivotally attached to a second plier portion. The first plier portion having a first handle and a first jaw, and the second plier portion having a second handle and a second jaw. The second plier further including a cutting edge in cooperation with the first plier, which cutting edge is used before cutting items such as, but not restricted to wire. The first and second jaw portions further include a hammer formed on the outside surface, such that the tool can be used as a hammer. The first and second jaws further define cooperating groove portions having cutting surfaces sized to cut varying sizes of wire and cable, including ROMEX multi-conductor cable.

Abstract: An improved tamper resistant screw and driver tool. In one embodiment, the present invention provides a tamper resistant screw and screw driver tool. The screw head features a unique tamper resistant design. The screw cannot be turned successfully with standard screw drivers, pliers, vice grips, wrenches or socket type wrenches. It is driven by a specially designed driver tool which, upon application, is centered on the screw head to avoid side-to-side slippage and is driven by angle-to-angle contact. The angle and depth of the drive tool can be changed to maximize the amount of torque delivered to the screw. This design not only discourages an individual from attempting to gain access to a restricted area, it will clearly indicate if the screw head has been tampered with by means of score marks and gouges.

Abstract: The present invention of a connecting shaft device for screws mainly comprises a sliding sleeve having a magnetic element disposed on the inner circumference of the front end, the sliding sleeve is then sleeved on a connecting shaft and can slide on it, the sliding distance is controlled by an elastic element, a slant groove and a groove, the structure is simple and can temporarily position a screw, hold the screw in locking position and at the same time can also control the depth of locking.

Abstract: A screw has a head releasably engaged by a flat blade tip in such a manner so as to prevent the flat blade tip from sliding off of the head of the screw as the flat blade up tip drives the screw. The head of the screw has a blind slot defined by a pair of walls and which extends diametrically and completely thereacross, and a blind bore extending concentrically therein. The diameter of the blind bore is less than the width of the blind slot preventing damage to, or breakage of, a drill bit used to drill the blind bore during manufacture by preventing the drill bit from hitting the pair of walls during drilling. The flat blade tip has a projection depending centrally therefrom that is coplanar with, and is a continuation of, the flat blade tip so as to allow the projection to be readily formed by merely removing material from the flat blade tip.

Abstract: An extension apparatus is provided for connecting a tool with a tool bit. The extension apparatus includes a driving element with a first end for engagement with the tool and a second end for engagement with the tool bit, a telescopic element inserted in the driving element, a magnet attached to the telescopic element and a barrel movably mounted on the driving element for receiving a fastener to be driven via the tool bit.

Abstract: A marine or aviation tool for moving and replacing a marine or aviation cover having a pair of spaced holes as a pair of pins which are adjustable to be aligned with the holes. The pins extend from head having socket therein for receiving either extender which cooperates with ratchet wrench handle or another extender which cooperates with a screw gun drill so that one has the option of rotating the head directly as a key or operating the head remotely. The head includes a VELCRO® patch for coupling with a mating VELCRO® patch on the cover so that after the cover is removed it remains attached to the head will not fall overboard due to broken chain.

Abstract: A drive wrench structure includes a drive handle provided with a threaded rod which is provided with a guide rod, and a mounting stud having a first side formed with a screw bore screwed on the threaded rod of the drive handle, and a second side formed with a through hole for passage of the guide rod of the drive handle. The guide rod of the drive handle may protrude outward from the through hole of the mounting stud when in use, and may be retracted into and fully hidden in the through hole of the mounting stud when not in use, thereby protecting the guide rod of the drive handle, and thereby facilitating storage of the drive wrench structure.

Abstract: A tool adapted to releasably retain a fastener. The tool includes a driving portion having a plurality of tool surfaces adapted to form an interface with a fastener. At least one fastener engaging member is attached to the driving portion that extends above one or more of the tool surfaces. The fastener engaging member is adapted to form an interface with at least one surface on the fastener such that the fastener can be releasably retained to the driving portion.

Abstract: An apparatus and associated method for automatically installing a fastener to a fastener receptacle portion of a work piece. A fastener apparatus comprises a central frame supporting a datum member. The datum member defines a fastener position, and the datum member is operably engageable with a characteristic feature of the work piece. The fastener apparatus further comprises a fastening tool supported by the frame and moveable to the fastener position. The fastener apparatus further comprises a biasing member biasing the work piece characteristic feature in operable engagement with the datum member aligning the fastener receptacle with the fastener position.

Abstract: A tool adapted to releasably retain a fastener. The tool includes a driving portion having a plurality of tool surfaces adapted to form an interface with a fastener. At least one fastener engaging member is attached to the driving portion that extends above one or more of the tool surfaces. The fastener engaging member forms an interface with at least one surface on the fastener such that the fastener is releasably retained to the driving portion.

Abstract: A handle for hand tools includes a body and a plug. The body has a front end and a rear end, and a seating hole adapted to hold a hand tool is defined in the front end. An inner cavity is defined in the rear end, and two magnets are mounted in the inner cavity. A magnetizing space and a demagnetizing space are formed between the two magnets and one magnet and a surface of the inner cavity, respectively. The plug is attached to the rear end of the body, and a magnetizing hole corresponding to the magnetizing space and a demagnetizing hole corresponding to the demagnetizing space are defined in the plug. A slot adapted to turn a cup hook is defined in the plug and crosses the magnetizing and the demagnetizing holes. Consequently, the handle has multiple functions.

Abstract: A screwdriver comprises a handle, a hollow outer sleeve, at least an inner pipe, and a bit. The rear end of the outer sleeve connects to the handle. The inner pipe is inserted in the interior of the outer sleeve via the front opening of the outer sleeve. A magnetic chuck is disposed at the front end of the inner pipe. The magnetic chuck is inserted in the rear portion of the bit.

Abstract: The present invention relates to a magnetic connecting tube for a screwdriver head with a main body, a push element, a spring element, a fastening ring, a block member and an engaging element. The main body having an engaging hole at one end thereof for receiving a hexagonal head which is secured by the engaging element in position. The main body includes under the engaging hole a through hole in which two permanent magnets are so arranged that the repulsive poles face to each other. When the hexagonal head is inserted into the engaging hole, it presses against the upper permanent magnet. In order to drive out the hexagonal head by means of the effect of the push element and the engaging element, the repulsive force between the permanent magnets is utilized to repel the hexagonal head out of the engaging hole. Meanwhile, the upper permanent magnet has the magnetic force to attract the hexagonal head such that the hexagonal head can be firmly attached and can't fall out of the engaging hole.

Abstract: A threaded fastener, such as a screw or a bolt, has a central longitudinal axis in a z-axis direction. The fastener has a head and a threaded shaft. The head has an overhanging periphery in an x-y plane and at least two slots, evenly-spaced apart, that extend completely through the overhanging periphery. Each slot has a sloped surface that undercuts the overhanging periphery in the same tangential direction. The screw is turned by using a bit that has a central longitudinal axis in a z-axis direction. The bit has a shank fixed to an end portion and at least two legs, evenly-spaced apart, extend from the end portion in a z-axis direction. Each leg has a sloped surface that extends in the same tangential direction.