Abstract: The invention concerns a unit (210) for a locking device, comprising: a nut (212) comprising two coaxial taps in opposite directions; and a ring (213); said ring including a third tap (38); the first (18) and third (38) taps being capable of engaging with a single first thread (22); said ring including a second thread (40) capable of engaging with the second tap (20) of the nut. The unit further comprises a washer (214) configured (274) so as to be inserted around one (212) of the nut and the ring, the washer comprising an elastic engagement means (272) for engaging with the other (213) of the ring and the nut in an installation position of the unit, so as to prevent the ring and the nut from rotating relative to each other.

Abstract: A bolt tensioning assembly has a bolt with a first end portion and a second end portion at an opposite side of the bolt. The first end portion has an enlarged diameter to form a counter-pressure surface facing the second end portion. The first end portion has external threads to receive a lock nut. A hydraulic bolt tensioning device is for tensioning of the bolt. The hydraulic bolt tensioning device is arranged for enclosing a portion of the bolt such that it abuts the counter pressure surface. A lock nut is arranged on the first end portion of the bolt. The hydraulic bolt tensioning device and lock nut are dimensioned such that upon tightening of the lock nut, the lock nut will tighten against a portion of the hydraulic bolt tensioning device.

Abstract: A bolt-nut (1) includes: a nut body (4) in a substantially cylindrical shape; plural nut divided bodies (4a); a cover body (5) in a substantially cylindrical shape for covering the nut body (4); a cover-side tapered portion formed on an inner wall of the cover body (5); a nut-side tapered portion (4a) formed such that an outer diameter of an outer wall of the nut body (4) is reduced toward one end portion thereof so as to correspond to the cover-side tapered portion; a spring (6) that is accommodated together with the nut body (4) in the cover body (5); and a nut (2) that includes a lid body (7) covering the other end portion of the cover body (5). A bolt screw as a ridge of the bolt and a nut screw as a ridge of the nut body (4) have unequal pitches that are different from each other.

Abstract: There is provided a nut having a thread portion having a female thread, a metallic plate portion having a base segment, and a hardness gradient portion provided between the thread portion and the metallic plate portion. The thread portion, metallic plate portion and the hardness gradient portion are monolithic each other, a metallographic structure of the metallic plate portion differs from a metallographic structure of the thread portion and a hardness of the hardness gradient portion is lower than a hardness of the thread portion and lowers from the thread portion toward the metallic plate portion.

Abstract: Load-bearing ring (120, 220) have segments (121, 122, 221, 222) connected by studs (123) or frangible portions (228), where opposed tapered faces (125, 126, 225, 226) co-operate with complementary faces (114, 115) on hydraulic fasteners (110, 210) on a tapered face (342) on a washer (341), to enable controlled release of the load-bearing rings (110, 210) to enable de-tensioning of a bolt or stud tensioned by the hydraulic fasteners (110, 210, 310).

Abstract: A tensioner for tensioning foundation bolts generally used in securing large utility towers is provided. The tensioner generally comprises a hollow outer body through which the foundation bolt can extend. The lower end of the body, which is adapted to abut onto the foundation surface from which the bolt extends, is provided with an opening allowing access to a foundation nut threaded onto the foundation bolt. The upper end of the outer body slidingly receives therein an inner body with which it defines an annular hydraulic piston, the inner body being configured with a seat portion for receiving and engaging a split nut mounted to the foundation bolt. Upon providing hydraulic fluid to the tensioner, the hydraulic piston urges the split nut, engaged to the foundation bolt, upwardly, thereby tensioning the foundation bolt. The load in the bolt is then maintained by threading down the foundation nut until it abuts onto the foundation surface.

Abstract: Axially expandable spacers (51, 53) are insertable between a nut (20), on a bolt (19) to be tensioned, and a face (F) on a component (C) and have ramp faces (52, 54) to take up the space as the bolt (19) is tensioned by an hydraulic tensioner (25), where the puller bar (35) is engaged with an extension (121) on the nut (120). A segmented collar (60) has radially movable segments (61) to allow quick engagement/release between the puller bar (35) and the end of the bolt (19) on the nut (120).

Abstract: The present invention consists of a connection, having an anchored, elongated tension member, a fastening member attached to the elongated tension member, a resisting member that receives the elongated tension member and an expansion device that receives the elongated tension member there through. The expansion device is formed with a sleeve. First and second bearing members are received in the central aperture of the surrounding sleeve A torsion spring connects the first and second bearing members and is located within the surrounding sleeve. The torsion spring biases the first and second members in opposite rotational directions.

Abstract: The present invention consists of a connection, having an anchored, elongated tension member, a fastening member attached to the elongated tension member, a resisting member that receives the elongated tension member and an expansion device that receives the elongated tension member there through and is compressively loaded between the fastening member and the resisting member by operation of the fastening member on the elongated tension member. The expansion device is formed with a sleeve. First and second bearing members are received in the central aperture of the surrounding sleeve and operatively connected to the surrounding sleeve. At least one of the bearing members is threadably connected to the sleeve. This bearing member can rotate in relation to the surrounding sleeve.

Abstract: A double nut for a controlled fixing of a component using a bolt connection, comprising a pulling sleeve having an internal thread adapted to be screwed onto a threaded end of a bolt, and a pressing sleeve adapted to be supported on the component. An internal thread of the pressing sleeve is adapted to be screwed onto an external thread of the pulling sleeve, and engages such external thread to such an extent that the internal thread of the pressing sleeve is spaced by a distance equaling several threads from that end of the pulling sleeve that faces the component. The external thread of the pulling sleeve is furthermore adapted to threadedly receive a pull bushing of a bolt-tightening cylinder that has a support bushing adapted to be supported on the component and to extend over the pulling sleeve and the pressing sleeve.

Abstract: A washer has a body having an axis and provided with a first face surface located at one axial side and adapted to cooperate with a nut, a second face surface located at an opposite axial side and adapted to cooperate with an object to be assembled or disassembled, and at least one additional turning resistant surface adapted to cooperate with a bolt, the additional turning resistant surface of the body being formed as a frictional surface providing a friction between the body and the bolt to frictionally impede the bolt from turning and at the same to allow the bolt to be displaced in an axial direction when the nut is turned, the second face surface of the body being formed to provide a friction between the body and the object and therefore to impede the body from turning, and the first face surface of the body being formed with a smaller frictional characteristic than the second face surface of the body to at least reduce dragging of the body into turning by the turning nut; and a fastener is provided with

Abstract: A casing of a hydraulic machine such as a gas turbine is formed as a horizontally split type flangeless casing. The flangeless casing consists of an upper casing and a lower casing joined together at joint faces and fastened by fastening bolts. The fastening bolt has a screw thread which engages the threaded hole on the joint face of the lower casing. A bolt hole having an internal screw thread and through which the fastening bolt passes is provided in the upper casing. A sleeve having an external screw thread is fitted into the bolt hole of the upper casing by engaging the external screw of the sleeve with the internal sleeve of the bolt hole. An enlarged diameter portion is formed on a shaft of the fastening bolt at the portion where the enlarged diameter portion abuts an upper end face of the sleeve when the fastening bolt is screwed into the threaded hole in the lower casing.

Abstract: A hydraulic nut having a first part connected around the first end of a fixing member the first part having an annular recess which opens to receive a second part forming an annular member which fits within the annular recess, wherein a pressurized medium chamber is defined between the second part and the annular recess. The second part has an annular portion which extends longitudinally away from the first part. The annular portion has an outer surface which is spaced radially inwardly to form a locking part recess. A locking part is placed within the locking part recess, and has an inner diameter which is threadedly engaged with the second part outer surface. The locking part has a surface facing the first part first surface, and movable by the threaded engagement with the second part to an abutment with the first part first surface.

Abstract: A system (150) and method of tensioning a bolt (44) across a flange assembly (42). A tensioning apparatus (40) includes the bolt and an unthreaded nut (48) connected to the shank member by an interference fit. The interference fit may be selectively relaxed by applying a fluid pressure to a groove (54) between the nut and the bolt. A tensioner (58) is energized by a pressure to pre-load the bolt by pulling on the bolt while pushing on the nut while the interference fit is sufficiently relaxed to allow relative movement between the nut and the bolt. The tensioner is sized to achieve the required pre-load in the bolt at the same working fluid pressure that is necessary to relax the interference fit on the stretched bolt, thus permitting a single pressure source (148) to be used for both functions.

Abstract: A power tool for fastening objects has a housing with a non-rotatable element, a power drive in the housing and provided with a rotatable driving element, and a fastener part including a bolt having a thread and an axis and introducable into parts forming an object, a nut screwable on the bolt and cooperating with the rotatable driving element, and a washer to be applied between the nut and an object and cooperating with the non-rotatable element, the washer having an axis and being provided with a first bearing face surface located at one axial side and adapted to cooperate with the nut, a second bearing face surface located at an opposite axial side and adapted to cooperate with the object, and at least one third turning resistant surface adapted to cooperate with the thread of the bolt, so that when driving element turns the nut with a given active force in one direction and the washer is held stationarily applied by the non-rotatable element of the housing, the nut turns to tighten or loosen the bolt, and

Abstract: A stud tensioning device includes a nut having internal threads and external threads. The internal threads engage corresponding threads on the stud. At least two axial bores are defined by the nut, and posts are disposed in the bores. Each post at a first end thereof engages a stop surface, and at a second end thereof extends external to the bores and axially beyond a free end of the stud in a direction away from the structural member. A load cell threadingly engages the nut applying an axially-directed force on the posts in a direction toward the structural member and on the nut in a direction away from the structural member to thereby tension the stud.

Abstract: A nut includes base portion forming an inner threaded bore and a first sun gear. cap forms a second sun gear of which the teeth is different from that of the first sun gear. The cap is rotatably mounted to the base with the first and second sun gears opposing and coaxial with each other. A control ring carries planetary gears engaging both the first and second sun gears. The nut secures a rotatable member of a rotary machine to a threaded driving axle. The nut is initially and loosely tightened on the axle by manually rotating the control ring. The cap has a high friction surface engaging the rotatable member. When the axle starts to rotate, a relative rotation occurs between the rotatable member and the axle which causes the cap to rotate with respect to the base. The rotation of the cap is transmitted to the base by the planetary gears to securely and completely tighten the nut.

Abstract: A nut includes an extended flange and a center hole. A shoulder is formed onto the edge of the center hole to achieve an easier and faster assembly. The shoulder has an essentially tubular shape and is provided with a thread on its inside wall.

Abstract: A threaded fastener arranged to engage with a threaded shaft and tighten an object to the shaft by stretching the threaded shaft approximately parallel to its own axis. The threaded fastener is arranged so that when screwed on to the shaft the contacting surface are not parallel, thereby leaving a gap. The threaded fastener further comprises a tilting means of levering the surfaces away from one another and enlarging the gap between the surfaces. The tilting means may comprise an additional threaded shaft being threaded into an additional threaded aperture in the fastener or a ball bearing located in a groove on the surface of the fastened and contacting the surface of the object. The tilting means stretches the threaded shaft without bending the bolt requiring far less torque for stretching than a conventional nut and bolt tightened with a wrench.

Abstract: An operating ring (7) is externally fitted, with the ability to rotate, to the main body of the locking nut in between a locking flange (3) and a flange of the locking nut (5); ball bearings (11) are inserted between the operating ring and the locking flange; three or more arc-shaped grooves (54) are formed—facing toward each other and extending in concentric shapes in the circumferential direction—in the mating surfaces of the flange of the locking nut and the operating ring; locking balls (9) are accommodated inside the arc-shaped grooves of the flange of the locking nut (5) and the operating ring which face toward each other; the total dimension—in the axial direction of the rotary drive shaft—of each pair of arc-shaped grooves which accommodate the locking balls (9) is set smaller than the diameter of a locking ball; and a localized indentation is formed at the bottom surfaces on at least one side of said pair of arc-shaped grooves.

Abstract: A clamping screw for holding a tool to a threaded shaft is provided with a body member having a threaded surface for engagement with the threaded shaft. A flange ring is disposed about the body member and clampingly engages the tool when the body is threaded onto the shaft in engagement with the tool. An operating ring is rotatably disposed about the body member and retained from movement axially away from the flange ring. A torque increasing mechanism is operatively disposed about the body member between the operating ring and the flange ring and is configured to transmit torque from the operating ring to the body member.

Abstract: A screw fastener with a second, additional external thread section apart from the main, external or internal, thread section in a typical bolt or nut, respectively. The axes of the two threaded sections in the nut or bolt are arranged parallel, eccentric, or angled relative to each other and the direction in which the thread travels for any threaded section may be the same, or different from the thread in the other section. A cap may also be formed on top of the externally threaded structure.

Abstract: A collet nut has a nut member for threaded engagement with threads on a collet holder. A sleeve member is rotationally coupled to the nut member in a first tightening mode of the collet nut. An annular ring is rotationally coupled to the sleeve member and rotationally coupled to the nut member in the first tightening mode. Facing ramped bearing surfaces are defined between opposing faces of the annular ring and the nut member and bearing devices, such as balls, are disposed between the opposite faces. In the first tightening mode, the nut member and the annular ring rotate as a unit. In a second tightening mode, the annular ring rotates relative to the nut member so that opposing high sections of the ramped bearing surfaces are brought rotationally closer thereby forcing the annular ring axially away from the nut member which imparts an additional axial force to a collet engaging member of the collet nut.

Abstract: Jackbolts for multi jackbolt tensioner embody a thread construction which taper from a maximum diameter adjacent to torque receiving end of the jackbolt when threadedly engaged with a threaded opening in the outer peripheral part of a jackbolt body. The threads of the jackbolt have a different thread pitch than the threads in the jackbolt body and the tooth flank of the jackbolt threads for an angle with the tooth flanks of the thread in the jackbolt body. By this thread construction, there is formed a helical volume of ever increasing size along the jackbolts commencing at a metal to metal relation at the torque receiving end. Stressing of the jackbolt closes the helical volume bringing the threads to a metal to metal load transfer relation. The end of the jackbolts has a protruding central end portion that elastically flattens under stress to reduce torque requirements.

Abstract: A clamping device for holding a rotating tool or stationary object to a threaded shaft of a power tool or machine includes a body member having an annular ring configured therewith. The annular ring has at least two concentric ramped bearing surfaces defined on an inner axial face thereof. An operating ring is rotationally mounted on the body member and has an axial face with concentric ramped bearing surfaces defined thereon oppositely facing the bearing surfaces on the annular ring. The operating ring has a second axial face with at least one unramped bearing surface defined thereon. A flange member has an inner axial face opposite the operating ring second axial face. The flange member is axially movable relative to the body member and presses against and clampingly holds a rotating tool relative to a drive shaft upon manual rotation of the operating ring in a tightening direction. A bearing device is disposed between the ramped bearing surfaces of the annular ring and the operating ring.

Abstract: A nut has a nut member having a thread for engaging a bolt, a stud and the like and a plurality of screw members extending through the nut member and provided at its one ends with gears to be simultaneously engaged by an additional member and simultaneously turned, so as to simultaneously turn the screw members adapted to abut against an object, and to tighten or to loosen the nut. A tightening device includes the inventive nut and an element which simultaneously engages the gears of the screw members and turns them to tighten the nut.

Abstract: A tamper-proof, precision, torque limiting nut device is disclosed. The device comprises an inner collar member having a threaded bore to receive a bolt, stud or the like and an outer sleeve member interconnected to the collar by pins or by welds having a shear strength up to a predetermined torque value. The nut can be tightened on a bolt or stud up to the predetermined shear value, above which the pins or welds shear, to achieve tightening of the nut to the desired torque without the use of a torque wrench. Overtorquing and undertorquing are prevented, and tampering with the nut is substantially obviated.

Abstract: A mechanical sensor for use with bolts, nuts, eye bolts and other fasteners is provided to sense fastener tension and to mechanically indicate that tension and changes therein by mechanically measuring deformation of the substrate being clamped by the fastener relative to the distortion or lack thereof in the substrate immediately adjacent the deformed substrate. The differential substrate deformation produces measurable and often clearly visible movement of a portion of the sensor. Such movement may be interrogated through utilization of visual, optical, electro-optical means as desired.

Abstract: A fastener for securing an object to a threaded spindle comprises a nut portion and a flange portion rotatably connected so as to rotate independently. The fastener includes a bore therethrough having threaded and unthreaded regions, the threaded region for securing the fastener to the spindle.

Abstract: A lock nut for connecting a joint having a threaded connector has a first nut member which is engageable with a threaded connector and is axially displaceable, a second nut member which is engageable with the first nut member and is rotatable about an axis, a third nut member which is non-rotatably but axially displaceably connected with the first nut member and has a substantially smooth surface over which the second nut member moves during rotation, so that when the second nut member is rotated about the axis against the smooth surface of the third nut member, the first nut member is displaced axially to apply a load to the threaded connector and to tighten the lock nut, and a locking element which non-rotatably connects the first and second nut members with one another after tightening of the lock nut.

Abstract: A clamp screw for clamping a rotating member including a threaded member, a flange member axially movable with respect to the threaded member, and an operating ring for actuating the clamping screw. The clamp screw includes a ball screw transmission mechanism between the operating ring and the threaded member, the ball screw transmission mechanism being configured to transfer rotational movement of the operating ring to axial movement of the flange member for actuating the clamp screw.

Abstract: A self-tensioning, disc spring assembly is provided. The assembly has a circular disc spring with an outer diameter and an inner diameter defining a center hole. The disc spring has a height greater at the inner diameter than at the outer diameter. The disc spring is also resiliently compressible such that it can be flattened. A zinc element, being zinc or a zinc alloy, is provided in the form of a ring or other shape, or a surface deposit on the disc spring or nut, to prevent rusting of the lug bolt. In addition a method of fastening a rim to a hub is also provided. The method has the steps of: positioning the rim on the hub so that the at least one lug bolt passes through the at least one mounting hole of the rim; providing a tensioning disc spring assembly on the at least one lug bolt; screwing a nut onto the at least one lug bolt to a preselected torque so that the disc spring flattens when a preselected torque amount is achieved.

Abstract: A pre-tensioning device is used with a fastening element for fastening pieces together, the fastening element having a tightening element movable longitudinally along a first region thereof, which fastening element is to be subjected to a pre-tensioning expansion. The device comprises a locking piece fixedly attachable to the first region of the fastening element and extending over the tightening element; the tightening element being movable with respect to a piece to be fastened independently of the locking piece; and an annular sleeve made of a shape memory metal and positioned between the locking piece and the piece which is to be fastened to another piece, whereby when the annular sleeve is heated it undergoes an expansion due to a phase transformation and forces the locking piece upwards such that the fastening element is stretched and the tightening element can be tightened against the piece to be fastened.

Abstract: An hydraulically assisted fastener has a pressure means (13) nested in a recess (15) or groove in a nut (11) or a thrust washer with a filler neck (20, 31, 44) whereat a nipple (14) can be used as a means of pumping grease or oil to the pressure means. The pressure means can be a bladder (13) or two parts with mated channels (42, 43). Alternately the pressure means (13) can be a single part with open channel (45) nested in a channel (46) in a nut body or thrust washer.

Abstract: Vehicle wheel inserts adapted to extend into the stud-receiving openings of a vehicle wheel and particularly, a non-ferrous vehicle wheel and lug nut assemblies thereof. The inserts are effectively stamped from sheet metal, and are relatively thin and light in weight. The inserts are uniquely designed so that the inserts can be permanently locked in the stud-receiving openings of the vehicle wheel. The inserts are preferably, although not necessarily, provided with a ring flange and the peripheral edge of this ring flange engages a shoulder-forming wall in the stud-receiving opening to tightly retain the insert within the stud-receiving opening. In accordance with this construction, the inserts may be provided with a depending skirt but which does not provide any locking function for securing the inserts in the stud receiving openings. Further, it is not necessary to provide any depending skirt on the insert whatsoever.

Abstract: A hydraulic bolt tensioner having a first chamber and a second chamber, a first hollow piston movable in the first chamber and partially extending into the second chamber, a second piston displaceable inside the first piston and movable in the second chamber, the second piston having connecting means for connecting with an end of a bolt, and a hydraulic fluid supply into the first chamber so that when hydraulic fluid pressure is applied to the first chamber, the first piston moves so that the first piston displaces the hydraulic fluid in the second chamber and moves the second piston to pull the end of the bolt.

Abstract: A high-strength bolt and a high-strength nut is suited for use in combination with a standardized nut and a standardized bolt, respectively. The high-strength bolt and the high-strength nut have an external triangular thread and an internal triangular thread, respectively, of which the angle no greater than the range of each thread ridge differs by an angle of 0.degree.55' to 2.degree. from the angle of standardized thread ridges.

Abstract: A lock nut to connect a joint having a threaded connector has a first nut member engagable with the threaded connector and axially displaceable, a second nut member engagable with the first nut member and turnable about an axis, a third nut member which is non-rotatably but axially displaceably connected with the first nut member and has a first substantially smooth surface over which the second nut member moves during rotation and another substantially rough surface which is embedable into a surface of the joint, and a locking element to achieve non-rotatability of the nut members. When the second nut member is turned about the axis against the smooth surface of the washer, the first nut member is displaced axially to apply a load to the threaded connector, while the rough surface of the third nut member embeds into the surface of the joint. When the lock nut is sufficiently tightened, the locking element eliminates the rotation of the second nut member.

Abstract: The tightening screw of the invention comprises a screw member forming a female threads or male threads in the shaft core part, a flange ring fitted to the outer periphery of the screw member to contact with the object to be tightened, an operating ring for feeding a rotational force by fitting oppositely to the flange ring on the outer periphery of the screw member, and a torque transmitting member interspaced between the screw member and operating ring for transmitting the rotational force of the operating ring to the screw member. The torque transmitting member comprises a reduction mechanism for transmitting the rotational force of the operating ring to the screw member by reducing the speed, and a unidirectional torque limiter for cutting off transmission of torque in the tightening direction of the screw member to the object to be tightened at a specific load.

Abstract: A tightening screw in which a rotating ring is rotatably held on a flange ring, a screw member having female threads in the same pitch as the male threads of the bolt to be fitted, with the female thread diameter formed larger than the male thread diameter, is rotably held eccentrically so that some of the female threads of the screw member may be engaged with the male threads preliminarily, and the flange is fixed at the time of tightening so that the rotating ring may revolve the screw member, and thereby the decelerated rotation created in the screw member produces a large tightening force to increase the torque.

Abstract: An annular fluid type pusher for tightening a part on a shaft comprises, a body mounted on the shaft, a pushing piece for pushing the part with a fluid pressure, a sealed fluid path formed annular in the body for sealingly containing a fluid and slidably holding said pushing piece in part, a fluid pressure adjusting section for adjusting the fluid pressure, an indicator cylinder chamber communicated with the sealed fluid path, an indicator piston slidably provided in the cylinder chamber, a spring to urge the piston against the fluid pressure, and a thrust indicating bar. Thrust graduation lines have been marked on the thrust indicating bar. And one end portion of the thrust indicating bar is connected to the piston, and the other end portion is provided in such a manner as to be protruded in association with the movement of the piston which is slidably moved in proportion of the fluid pressure.

Abstract: Vehicle wheel nut inserts adapted to extend into the stud-receiving openings of a vehicle wheel and particularly, a non-ferrous vehicle wheel and lug nut assemblies thereof. The inserts are uniquely designed so that the inserts can be permanently locked in the stud-receiving openings of the vehicle wheel. In one embodiment, the wheel inserts can be locked by means of an interference fit, and in another mode, the inserts can be locked by swaging and still further, the inserts may be locked by means of staking the inserts in the stud-receiving openings. Not only are the inserts permanently affixed within the stud-receiving openings, they will also operate to bear against the lug nuts. In this way, a spring-type loading is imposed on the lug nut preventing an unauthorized vibrational unwinding of the lug nut. The insert will deflect when tightened against the wheel opening by a lug nut to thereby provide a Belleville spring effect.

Abstract: A mechanical tensioner for elongating and relaxing a stud having an axis and arranged in an object, comprises at least two parts including a first part connectable with a stud to pull the stud in an axial direction so as to elongate the stud and thereby to tension it in an object or to relax the stud, a second part connected with the first part movably in a transverse direction relative to the first part, and a friction element arranged between the first part and the second part and connected with the first part immovably in a transverse direction relative to the first part.

Abstract: The present invention provides a compliant nut that can provide a more consistent compressive force to engine components by using a compliant section to absorb axial deflections. The present invention also provides a self centering feature that positions the nut upon compression, reduces thread stresses and prevents nut and shaft runnout. The invention consists of an annular member having threads on the inner diameter for mating with a threaded shaft and having a conical portion extending axially and radially inward from the annular member for abutting engine components and the engine shaft. The nut includes a plurality of exciter teeth circumferentially disposed and extending radially from the annular member used to provide shaft speed signal for engine controls and a plurality of axial spline members extending axially from the annular member on the opposite face from conical section for mating with torque applying tools and locking mechanisms.

Abstract: Cantilever shafts (34, 40) support bearing assemblies (54, 56). An improved lock nut (70-86) permits precise installation of the bearing assemblies, to improve operation of associated rotary tools (18, 20).

Abstract: An annular piston and cylinder device comprises an annular cylinder and a piston therefor, the piston having sidewall portions which extend into the cylinder towards the base thereof in the form of tapering annular webs which together define between them a recess of asymmetrical cross section.

Abstract: A liveload assembly having a stack guide with a thread on the exterior side wall, a plurality of compressible belleville washers stacked inside the stack guide, and a retainer cap having a thread on an inner side wall for matingly engaging with the stack guide to hold the belleville washers in compression. The gland follower of a fluid flow apparatus is liveloaded by placing the liveload assembly over the bolt extending upwardly from the gland follower. A nut is threaded on the bolt to contact the stack of belleville washers and the retainer cap is unscrewed to a second position on the stack guide and fixed by turning a set screw through a bore in the cap and against the side of the stack guide. Compression of the gland follower is monitored by viewing the relative movement of the stack of belleville washers through a longitudinal slot in the side wall.

Abstract: The present invention provides a method and apparatus for adapting standard threaded fasteners for use with a standard stud tensioner. An adapter has internal and external threads. The internal threads mate with the external thread of the stud to be tensioned. The external threads of the adapter engage the internal threads of a fastening nut having slots on the top thereof for engagement with a turning wrench of the tensioner. The adapter has a central threaded bore on the top portion thereof which is adapted to threadably engage the puller bar of a tensioning apparatus. The stud is elongated by actuation of the tensioner, via the puller bar, lifting the adapter as the stud is tensioned. When appropriate strain is achieved on the stud, the fastening nut is turned down to a fastened position and the stud then can be relaxed.

Abstract: A stud installer is provided that will not transmit torque to the spindle while the stud is being installed. Additionally, the stud installer of the present invention will not transmit force in a direction perpendicular to the stud.The present invention includes a collar having a longitudinal bore therethrough. The collar has a bearing surface at one end and support surface at the other. The collar can be of various geometries such as a straight cylinder or cylindrical with the support surface of larger diameter than the bearing surface.A stud puller of unitary construction is also provided which includes an upper portion and a lower portion. The lower portion is constructed to be received by the bore in the collar. The upper portion has a diameter greater than that of the bore of the collar. In this manner, the upper portion rests on the collar and is free to rotate about the central longitudinal axis of the collar.

Abstract: A device for setting an anchor rod (3) in a borehole includes a housing (4) and a socket (5). The socket (5) is made up of a sleeve (6) and a liner (7). The sleeve (6) is rotatable relative to the housing (4) and the liner (7). The liner (7) is in threaded engagement with the anchor rod (3) by a standard thread and with the sleeve (6) by a fine pitch thread (6c). Due to the fine pitch thread engagement of the sleeve (6) and the liner (7), by rotating the sleeve (6), which remains axially stationary, the liner (7) and the anchor rod (3) are moved axially with the anchor and also moving axially relative to an expansion sleeve (2) so that the expansion sleeve (2) is expanded into an undercut in the borehole.