Abstract: A binding strap for holding the coiled cord of an electrical tool is provided. The binding strap is comprised of an elongate strap with Velcro connecting material on opposite faces. The end of the strap is split into a top flap and a bottom flap to receive and permanently affix an electrical cord of a power tool. The strap bends back over itself to encircle and secure by mating Velcro attachment the coiled cord of the power tool for convenience in storage. Further embodiments provide for retaining a drill chuck key at the free end of the strap.

Abstract: A driving-in device for fixing an anchor in a hole with an undercut and comprising a drill adapted to be received in a chuck of an impact drilling machine, and a drive-in sleeve-shaped member secured to the drill for joint rotation therewith. The drive-in sleeve-shaped member has at an end thereof remote from the end at which it is secured to the drill, a bolt portion that engages a threaded sleeve member of the anchor to screw it over a threaded portion of an expanding bolt to displace an expansible sleeve over an expander portion of the threaded bolt.

Abstract: Apparatus is provided for surrounding engagement with an associated truck collet to accommodate a plurality of collet sizes wherein a central H-shaped yoke pivotally mounts a first and second leg downwardly therefrom wherein each leg includes an inner and outer edge where the inner edge includes a first pair of aligned arcuate recesses of a first diameter wherein outer edges of the legs includes arcuate recesses of a second smaller diameter to accommodate chucks of varying diametrical configurations. A collet key member is rotatably mounted through the yoke and includes a first and second bevel gear at each end of the collet key with a handle selectively positionable adjacent each bevel gear to effect rotation of each bevel gear relative to an associated chuck or collet member.

Abstract: A tool bit selection device as an accessory for a hand held commercial drill motor is disclosed. The selection device is in the form of a chambered cylinder that is supported on the face of the drill motor. The chambers of the cylinder hold individual tool bits that are adapted to be placed on the driving end of a drive spindle of the drill motor. The support and alignment of the selection device on the drill motor permits the compliance of the tool bit and the drive spindle in pitch, yaw, roll and radial offset. The selection device merely stores and positions the tool bits and does not provide bearing support of the tool bit when in working position.

Abstract: A drill chuck key bearing includes an elongated support member having a pair of legs pivotally connected to the opposing ends thereof. The support member has an aperture therethrough, through which the shank of a drill chuck key is rotatably and slidably mounted. The legs have their free ends bent towards one another so as to engage a pair of opposing apertures in the drill chuck when the key is engaged with the drill chuck.

Abstract: A drill chuck key for use with a conventional Jacobs-type drill chuck includes a cylindrical shaft having a bevel gear secured adjacent one end. A knob has a central cylindrical boss receiving an opposite end of the shaft. A roll pin extends through aligned apertures in the boss and the shaft, securing the knob for rotation with the shaft. A circular ring is received with clearance on the shaft, between the bevel gear and the knob. The ring has a diameter less than the bevel gear and the cylindrical boss and greater than the shaft, such that the ring is captured on the shaft. A chain is connected to the ring for securing the drill chuck key to a selected mounting point. This arrangement allows rotation of the chuck key, without release of the securing chain.

Abstract: An apparatus for retaining a tile in a secure position to prevent rotation while an opening is drilled through the tile. The apparatus includes a surface having a multiplicity of concentric interior stepped depressions, each interior depression set beneath and within another, with each respective depression sized to be slightly larger than the standard dimensions of a conventional tile. The respective depression can be used to securely hold its respective sized conventional tile while a transverse force is applied to the tile to create an opening through the tile.

Abstract: A center for maintaining a cutting tool, such as a tapping tool or reamer, in axial alignment with a hole to be worked upon includes an elongated body and a centering pin received by a cavity defined in the body for movement between retracted and extended positions. A spring is interposed between the body and the centering pin for biasing the pin from the retracted position to the extended position, and the pin includes an accessible handle which projects through a slot provided in the body. The handle can be manipulated into a position within the slot for releasably locking the centering pin in a retracted position. For mounting the center within a machine tool, the body includes an end portion including a plurality of alternatively-sized cylindrical sections arranged axially along the body so that the body can be mounted within collets of alternative sizes. Moreover, the centering pin includes a live end for engaging the cutting tool when rotating to thereby reduce wear on the pin.

Abstract: A tether is disclosed for attaching a drill chuck key to the handle of a motor housing of a cordless drill. A length of elastic tubing defines a notched opening adjacent one end for the inserted reception of a drill chuck key handle leaving the handle unobstructed for insertion into a handle receiving recess provided in the cordless drill. The remaining end segment of the elastic tubing is provided with a similar notched opening for the formation of a looped segment enabling placement about the cordless drill handle or motor housing. A modified form of the tether includes a post structure for adhesive attachment to a cordless drill housing.

Abstract: A tap wrench comprising a handle portion and a chuck is provided with a joint arrangement that allows for axial misalignment of the handle portion and the chuck. The joint comprises a stem that extends from the chuck and provides four planar pins equidistantly spaced thereabout which slidably engage four slots equidistantly spaced about a central opening defined in the handle portion. The stem is retained within the central opening by the engagement of each pin in a respective slot. Oscillation of the stem within the central opening provides for the above-noted axial misalignment.

Abstract: A safety key for a toolroom lathe chuck having (1) a housing having a top end, a bottom end and an internal bore opening on the bottom end and extending towards the top end, (2) a sleeve concentrically surrounding said housing and axially slidable thereon between a first position and a second position, (3) a handle connected to and extending transversely to the top end of the housing, (4) a key member sized to be movably received in the internal bore of the housing at the bottom end thereof, (5) securing apparatus for securing the key member to the sleeve, (6) a spring for biasing the sleeve into its first position when no axially downward pressure is applied to the sleeve, whereby the key member will be completely withdrawn into the internal bore of the housing, and (7) a lever attached to the handle for applying axially downward pressure to said sleeve, the lever being adapted to provide such downward pressure to the sleeve when the lever is moved towards the handle, whereby the sleeve may be moved axially

Abstract: A tool bit such as a screw driving bit for use with a rotary power tool is conventiently stored in a cavity in the rotary power tool housing when not in use in a power tool chuck. The tool bit is retained in the recess by frictional engagement with a retainer spring. A push-button protruding from the rotary tool housing communicates with the bit holding cavity and retainer spring in a manner such that, upon depression of the push-button, the retainer spring is moved out of frictional engagement with the bit to enable its release from the storage cavity.

Abstract: An apparatus is set forth wherein a hand drill includes a conventionally configured elongate housing with an elongate orthogonally extending handle relative thereto, with a forwardly mounted collet to receive drill bits therewithin. The apparatus further includes a transparent drill bit housing pivotally mounted to an upper surface of the central housing body of the drill formed with a snap-fit cover to receive drill bits in a convenient and accessible manner. A bifurcated chuck-key holder includes resilient legs defining a slot to resiliently secure a chuck-key therewithin. A series of spirit levels are further provided wherein the levels include a mercury encapsulate leveling member to accommodate vibration in use of the drill, wherein the levels are positioned within an extension housing of the drill bit housing to provide various visible orientations of the levels during use of the drill.

Abstract: A hand crank for use on a drill press mounted chuck during a tapping operation. The crank comprises a body having an aperture which permits the crank to be installed on and in surrounding relationship to the drill press chuck body. A spring biased pin enters into the wrench anchor hole of the chuck body to secure the crank to the chuck. The illustrated crank has four equally spaced radial arms.

Abstract: A machine tool table for supporting a workpiece beneath a cutting tool during operations requiring that the cutting tool pass completely through the workpiece and into the table.

Abstract: An accessory storage retainer (11) is used for alternatively storing a screwdriver bit (13, 15) or a chuck key (17) having a handle (21) and a spindle (23). Retainer (11) comprises first and second parallel spaced cavities (33, 35) in base (25) for receiving either a screwdriver bit (13, 15) or a chuck key handle (21). A third cavity (49), which is disposed in base (25) perpendicular to and intersecting with cavities (33, 35), is for receiving chuck key spindle (23). A fourth cavity (81) may also be provided intermediate the first and second cavities for receiving another screwdriver bit (79). Retainer (11) is preferably embodied in a power screwdriver/drill (12), is used to store only screwdriver bits (13, 15, 79) when the power tool is equipped with a keyless chuck and is used to store a screwdriver bit (79) and a chuck key (17) when the tool (12) is equipped with a keyed chuck (29).

Abstract: A rotary machine, such as a hammer drill, comprises a tool-carrying shaft (12), which is rotatably supported in the machine housing (11) by means of a ball bearing (24). The outer race ring (25) and the inner race ring (26) of the bearing are axially secured in the housing (11) and on the shaft (12) respectively. In order to make possible a limited axial movement of the shaft (12) relative to the housing (11) one of the race tracks (27) of the inner race ring (26) and the outer race ring (25) is formed cylindrical.

Abstract: A DIY electric hand tool is provided to include a hand grip portion. A battery received in the interior of the hand grip portion supplies electric power necessary for the operation of the hand tool. A lower end of the hand grip portion is enclosed by two half-shells pivotably mounted thereto. an inner space suitable to accommodate tool heads and having a lower end opening is formed between the walls of the hand grip portion and the walls of the half-shells. A tool head receiving plate assembly has means for attaching it to a bottom end of the battery with the battery being located centrally on an upper surface of the plate assembly when they are held together. Along each of two longer edges of the plate assembly is provided with a plurality of tool head receptacles, each of which is suitable to receive a tool head.

Abstract: A resilient C-shaped clamp subtending an angle substantially more than 180 degrees, such clamp being internally conformable to a cylinder and being of a diameter such as to frictionally grip the quill of a milling machine, and having an entrance of greater width than the diameter of the spindle of the milling machine to facilitate axial alignment with and engagement on the quill. The clamp has a radial extension diametrically opposed to the entrance that is provided with an opening parallel to the cylindrical axis of the clamp for adjustably accepting shanks of accessory items.

Abstract: A storage system for cutting tool collets comprises a cylindrical drum with a plurality of bored recesses on the front face. These recesses serve to hold individual collets. A pair of cut slots serve to allow easy access to the collets. The drum is mounted upon an elongated version of the normal pivot pin of a milling machine. A rotating cover provides for individual access to the collets and keeps away foreign debris.

Abstract: An auxiliary handle is attachable by a band-shaped clamping member of a clamping device to a housing part of a hand tool such as a drill. A bearing part, supportable on the housing part, has alignable through openings for an axially extending depth stop. A U-shaped separate part is in engagement with the clamping member and has a through guide alignable with the through openings. When the clamping member is tightened on the housing part, it displaces the separate part transversely of the axis of the through opening for clamping the depth stop in the through openings.

Abstract: This is an improved method for quickly changing and holding drill bits in electric drills. It includes hexagonal-ended drill bits and a holder with safety device for the bits. The holder is a steel sleeve with a male hexagonal end for insertion into 1/4" and larger drills. The opposite end is a female hex to receive the hex-ended drill bits. The holder is magnetized to hold the bits. The holder also supports a spring loaded two-piece safety split sleeve device surrounding the holder. The drill bit end of the split sleeve is folded over a fit into a circular groove in the drill bit and is held firmly in the groove by spring tension. This device keeps the bit in the holder when removing the bit from the material being worked. The split sleeves pivot at their attachment point to the holder, thus permitting rapid changing of drill bits (and other hex accessories) by simply squeezing the chuck end of the split sleeves causing them to pivot, thus opening the opposite end so that bits can be inserted and removed.

Abstract: The present invention provides a multipurpose handle grip for holding electric tools, more particularly a handle for slipping on an electric driver or electric drill to effectively carry and release the driver head or the drill and to stably facilitate the operation of the electric tools and comprises a driver head strap, a handle plate and a locating bushing; the driver head strap comprising a plurality of slip holes around the circumference arranged in good order, an inner thread at the rear end for connection of the strap with the holder plate of the handle plate by way of a screw joint, and a transparent revolving cover, the revolving cover having a circular outlet; the locating bushing having a smaller inner diameter for easy insertion of the bushing into the locating hole of the holder plate for fixation of electric tools of different size; the handle plate comprising a handle and a holder plate, the holder plate having a locating hole for fixation of electric tools, a flange at the front and an outer t

Abstract: A floating tap holder has a shank rotatably connected to a hollow sleeve. The hollow sleeve has opposed longitudinally extending slots. A drive shaft connected to a conventional chuck is axially movable within the hollow sleeve. A hand operated drive rod extends transversely through the opposed slots and is secured to the drive shaft. A coil spring received within the hollow sleeve biases the transversely extending drive rod and connected drive shaft axially downward. In use, the freely rotatable shank is received in the chuck of a conventional drill press, milling machine or lathe. A tap is mounted in the chuck of the floating tap holder and positioned in a previously drilled hole to be tapped. The spindle of the machine tool is moved downwardly, thus compressing the spring within the hollow sleeve. Then, the hand operated drive rod is rotated, thus rotating the drive shaft and chuck. The sleeve also rotates with the hand operated drive rod.

Abstract: A protective deployment apparatus for guarding the cutting regions of a rotary cutting tool against damage, wear and injury to users, which could be caused by such a cutting tool during packaging, transporting, handling, storing, and installation into conventional tool holding and processing implements. An apparatus housing includes a gripping region for securing the conventional gripping collar which is affixed around a rotary cutting tool, so as to facilitate insertion and retraction of the tool between tool holding implements and the apparatus itself. The gripping region maintains the rotary cutting tool in a centered aligned position with respect to the longitudinal axis of the apparatus, while at the same time, keeping the entire cutting portion of the tool isolated within the confines of the apparatus housing itself, while in the retracted position.

Abstract: A holding device that attaches directly to the motor or handle of an electric drill, allowing the user to store the drill paraphernalia needed for a particular job on the tool.

Abstract: A tool housing includes first and second coaxial openings on opposite sides of the housing. Wall structure is provided for guiding the key head into the interior of the housing, where the key head is engaged by retaining structure. The second opening has an ejector member mounted therein for movement toward and away from the first opening. When the user of the tool wishes to eject the key from the housing, he pushes on the outer portion of the ejector member, causing the portion of the member innermost to the housing to contact the key head and to disengage and displace it outwardly through the first opening, thereby releasing the key from the housing.

Abstract: A manual tap guide having a base member which includes a drawer and a stiffening member for stiffening the base, a vertical upright, a horizontal support bar, and an arbor is shown and described. In this vertical tap guide, the arbor is rotated by hand, and may be positioned to any location on the table by means of adjustment of the horizontal support bar with respect to the vertical support.

Abstract: An electric drill's chuck key holding device is made up of an L-shaped chuck key receiving groove which comprises a first recess formed across the upper junction of the two half-housings of the drill body, and a second recess extended from the first recess in such a manner that it is perpendicular to the first recess. The two recesses receive an L-shaped chuck key. The first and second recesses have rubber members in such a manner that the rubber members protrude therein, thereby to positively hold the chuck key in the L-shaped chuck key receiving groove.

Abstract: An apparatus for retracting the tool from a machined piece on a machine comprising a movable assembly for holding the tool or the piece having a guide means for taking up play by lateral biasing.This apparatus involves means intended for providing lateral displacement of the said movable assembly away from its position for taking up play so as to separate the tool from the piece after machining.For a machine tool with an indexible rotating tool-holding spindle, the tool is indexed in a plane approximately parallel to that of the means for taking up play prior to activation of the above mentioned means which is utilized to separate the tool from the piece.

Abstract: A chuck key pad (10) disclosed has a unitary construction that is snapped onto an associated chuck key to permit application of a greater torque than would otherwise be possible during tightening and loosening of a chuck. The pad (10) includes a body (28) having a central hole (30) that receives the conventinal shaft of the chuck key and also includes spaced retainers (32) that engage the chuck key handle on opposite sides of its shaft upon mounting such that locking portions (34) of the retainers resiliently deflect over the handle with a snap action. In its preferred construction, the pad body (28) includes a central portion (36) defining the shaft hole (30) and also includes a pair of opposite end portions (38) including spaced pairs of the retainers (32). An elongated groove (40) extends through the central portion (36) and the end portions (38) of the pad to receive the key handle.

Abstract: The tool herein is used for guiding and ensuring the correct position for cross drilling a rod. Further, the tool will function as various types of work holders or tool holders. The tool is a cube with chamfered corners that form an eighteen sided symmetrical polygon. Each side has bored holes therein arranged in an appropriate size and location to permit the tool to be used for its many functions.

Abstract: A two-speed gear box for handheld electric drills and the like has the movable parts associated with gear changing on or associated with a lay shaft. Gear changing is preferably effected by moving a pair of dogs, slidably mounted in holes through a lay shaft gear, to drivingly engage in either of two dog clutch members on the lay shaft. A thin flexible arm, preferably including a ring around the lay shaft, mounted in cantilever fashion from a movable base effects movement of the dogs. Should the dogs not be in proper register with a respective dog clutch member when changing speed, then the arm flexes and urges the dogs into driving engagement when proper register occurs. A family of two-speed drills having different specialized functions, e.g. a drill, a hammer drill, a screwdriver/drill, a screwdriver, etc., can be produced with the maximum parts in common enabling greater manufacturing flexibility and lower cost of manufacturing the family.

Abstract: A drill jig for making a channel in a timber for containing flowable preservative comprises a body (10) having a first or perpendicular guide bore (20), a second or oblique guide bore (22) and a third or vertical guide bore (24). The guide bores (22) and (24) intersect in a cylindrical locating spigot (18) and the axes of the guide bores (20) and (22) intersect in the timber to be drilled. A collet (26) on the shank of the drill bit (28) limits the depth of penetration by the lower face (32) of the collet abutting an abutment face (34) on the body (10). The depth of pentration when using the guide bore (20) or (24) is limited by the collet (26) coming into abutment with an adjustable stop (38) on the body (10). No adjustments are necessary as between drilling perpendicular or oblique bores and it is ensured that the bores formed in the timber intersect to form a continuous channel for receiving flowable preservative.

Abstract: A precision hand-driven tapping system for use with an inert rotating-spindle machine which is employed for stability and guidance, comprising a wrench body, guide means and non-integral tap adapter and is secured within said machine by its chuck, collett or clamping device. The wrench body has thereon, and out of the tap line-of-sight, handles spaced 120.degree. apart, or a wheel-like device, for applying hand force to rotate the body. A series of tap-holding adapters are used to secure various sized taps by their shanks. Adapters are press-fitted into the wrench body. A machine clamping device holds the system guide means which, in turn, allows the adapter and tap holding body of the wrench to be manually advanced toward a work piece, manually operated to tap it, and to subsequently be retracted and removably secured at the machine clamping device without the machinist removing his or her hands from the wrench.

Abstract: A keyless chuck for a power drill having a drive spindle projecting from the drill housing. The chuck body is fixed on and rotatable with the spindle and has a plurality of jaws mounted for movement on axes inclined with respect to the spindle axis. The collar is mounted for rotation with and with respect to said body and has a split nut connected to the jaws to move them on said axes to grip or release a tool shank when there is relative rotation between said collar and said body. A ring is splined on the housing and is spring biased toward the housing. The ring is manually movable toward the collar to bring the axially projecting lugs on the ring in engagement with lugs on the collar to retard the collar from rotating which causes relative rotation between the body and the collar when the body is rotated. Inclined faces on the lugs force the lugs apart when movement of the jaws is prevented and the lugs cause an impacting action to overcome static friction.

Abstract: A power hand drill is clamped in the carriage which is slideably mounted on the vertical column. The lever arm is moved about a fixed pivot to control movement of the carriage. The lever arm is tubular and has a push rod extending from the handle into the interior of the housing to actuate a switch which, when closed, connects the power supply cord to a receptacle into which the drill power cord is plugged. The drill power switch is tied in the closed position. Therefore the user can control drill feed and operation with one hand.

Abstract: A quick-change system for power feed and positive feed drill motors having quick-change capabilities whereby a nosepiece may be separated from the drill motor employing a quick-release coupling that does not utilize threaded means. The quick-change system utilizes a quick-change nosepiece, chuck and shank adapter means such that the oil line to a fluid inducer remains attached during nosepiece removal.

Abstract: The chuck for holding a drill bit by its drill bit shaft comprises a chuck body connected to a drive shaft, a mounting opening in the chuck body in which the drill bit shaft is held coaxial with the chuck axis, a plurality of clamp jaws guided in the chuck body so as to be centrally advanceable to and retractable from the chuck axis in the mounting opening, an axial passage in the chuck body between the drive shaft and the mounting opening, through which hammer blows are transmitted to the drill bit shaft found in the mounting opening. In the mounting opening a chuck sleeve is clamped rigidly between the clamp jaws and in the chuck sleeve the drill bit shaft is guided slidably axially.

Abstract: A drill chuck for a hammer drill with a plurality of clamp jaws fed in feed channels to engage a drill in a tool holder, the clamp jaws being adjustable by means of a support ring, the support ring bearing a restraining casing having teeth thereon which can engage gearing in the support ring so as to lock it against further rotation. The restraining casing is lockable in two axial positions, in one position in engagement with the support ring, in the other out of engagement with the support ring. The restraining casing is slid into engagement with the support ring in a covering jacket which holds the restraining casing axially tightly so that drilling waste can not impede engagement of the restraining casing with the support ring. Cleaning passages run through the chuck body from the tool holder to the surroundings so that drilling waste will be removed from the tool holder and the chuck interior during drilling operation.

Abstract: A drill chuck is secured on a drill spindle so as to be actuated thereby. The drill chuck has an axial passage through which the impact effect of a central anvil shaft is transferred to the end of the drill held in the drill chuck. The drill chuck can be connected to the drill spindle by coupling elements respectively arranged in coupling retainers of the drill spindle and/or the chuck body. The coupling retainers are axially of greater longitudinal dimension than the coupling elements, and permit axial displacement of the drill chuck. A contact ring which can not be displaced in axial direction presents an annular surface towards a further annular surface at the drill chuck body. Abutment projections can preclude axial displacement of the drill chuck on the drill spindle, and associated abutment recesses are also provided into which the abutment projections fit at least to a depth equivalent to the axial displacement movement of the drill chuck.

Abstract: A boring bar and associated measuring gage device, according to the invention, includes a gaging surface on the measuring gage device that is engagable with a gaging surface on the boring bar. By such engagement, a measuring surface on the measuring gage device remains perpendicular to a reference plane defined by the cutting tip of the boring bar's cutting tool and the rotational center line of the boring bar, thereby substantially assuring accurate measuring, gaging, or positioning of the radial position of the cutting tip. Preferably, attachment means are provided for releasably fixing the measuring means to the boring bar in order to maintain such engagement of the gaging surfaces during such measuring, gaging or positioning of the cutting tool.

Abstract: A pistol grip, bone drill with a lever lock for convenient locking of the drill chuck for manipulation of the chuck jaws, particularly for facilitating advances of the drill bit, the bone drill having a contoured pistol grip handle with a hand crank for rotating an elongated drill barrel by a conventional bevel gear mechanism, the drill barrel having an end chuck with a connected revolver cylinder having engagement holes for receiving a locking pin displaced by the lever lock.

Abstract: A tool is disclosed for both drilling a hole and thereafter securing a screw anchor therein in a quick and expeditious manner. The tool comprises a handle with a threaded stem extending therefrom. The threaded stem allows a screw anchor and a hard plastic drill tip to be threadably mounted thereon. The tool facilates the manual application of sufficient drilling pressure to the thus mounted drill tip so as to form the appropriately sized hole for the screw anchor.

Abstract: An improved threading tool kit for forming threads on cylindrical members that have different diameters is provided and consists of a holding member that is pivotally threaded to the underside of a stock. The holding member can accommodate one of a plurality of different size bushings to guide one of the different diameters cylindrical members into the stock to be threaded.

Abstract: A tool that contains a chuck key, and a locking pin. When the key is placed in one of the pilot holes of a chuck such as found on a hand drill, the locking pin is inserted into one of the two remaining pilot holes. This holds the key in a positive position with the chuck when being tightened.

Abstract: The power tool has a magnetic base with superimposed permanent magnet assemblies. The upper assembly can be moved relative to the lower assembly to shunt or reinforce the magnetic field. When the sensing probe is pushed into the base the electric motor can be switched on to rotate a spindle on which a rotary cutting tool is axially mounted. The tool feed is controlled by a handle which can be mounted on either side of the tool housing. A coolant reservoir on the base has a hose connected to a pump which is connected to a manifold supplying coolant to the interior of the cutting tool. The cutting tool is biased upwardly and pinches off the coolant when the tool is raised from the work.

Abstract: A portable drill with drill bit storage capability, and with mechanized bit feeding from bit storage to chuck.

Abstract: A wear pad assembly is provided for machine tools or the like in the form of a generally frusto-conical pad member having a support surface on its base to receive a work piece and a base having a frusto-conical opening supportingly receiving the apex end of the pad member and a threaded attachment member removably connecting the apex end of the pad member with said base. The support surface is preferably knurled or otherwise toothed and hardened to hold a work piece against slipping.

Abstract: A drill chuck has a body carrying jaws displaceable between inner and outer positions and an adjustment ring operatively connected to the jaws for movement from outer to inner positions on rotation of the adjustment ring in a tightening direction. This adjustment ring has teeth engageable by an antiloosening detent and is urged by a spring into the teeth. The antiloosening detent is angled relative to the adjustment ring such that when engaging the teeth it blocks rotation of the adjustment ring opposite to the tightening direction and permits rotation of the adjustment ring in the tightening direction. An antitightening detent engageable with the teeth of the adjustment ring is urged by a spring outward into the teeth and is angled relative to the adjustment ring such that when engaging the teeth it blocks rotation of the adjustment ring in the tightening direction and permitting rotation of the adjustment ring opposite to the tightening direction.