Abstract: A nut is configured to be secured to a bolt. The nut includes a main body that defines an axially aligned bore with threads disposed on an inner wall thereof. Further, the nut includes a dome-shaped head that has an axially aligned aperture and that is provided to be deformed by threads on the bolt when a predetermined burst-through torque is applied thereto.

Abstract: A static eliminator (10) includes: a first conductor (11) that is electrically connected to at least a part of a static elimination target object (1); and a dielectric shell (15) that forms, between the first conductor and the dielectric shell, a first space (13) in which a gas (12) providing a condition of lowering a discharge starting voltage is sealed. The dielectric shell is exposed to an external space (9), as examples may be dome-shaped, spherical, ellipsoidal, or semi-ellipsoidal, and may be translucent.

Abstract: An exterior decoration device includes: a garnish frame including an upper surface and a reaction force hook protruding inclinedly from a rim portion of the garnish frame and configured to be elastically deformed; a level difference adjustment bolt configured to form a dispersion adjustment structure in a state of being coupled to the garnish frame, protruding in a direction opposite to the garnish exposure member, and configured to adjust both a surface level difference of the garnish exposure member and a hook level difference of the reaction force hook by inducing a rotation of the dispersion adjustment structure and changing a protrusion length from the garnish frame; and a fastening tool configured to define an excessive torque cut-off structure together with the level difference adjustment bolt.

Abstract: A foreign material exclusion plug is disclosed. The foreign material plug includes a cylindrical body, a slot, and a breakaway tab. The cylindrical body includes an externally-threaded cylindrical structure. The slot is formed in the cylindrical body extending into the cylindrical body from a top surface of the cylindrical body. The breakaway tab is connected to the cylindrical body and extends outwards from the top surface.

Abstract: A test cock is configured to connect to a test cock port. The test cock includes a body portion defining a flowpath between a distal end and a proximal end. The test cock includes an intake stem at the proximal end that has external threads to connect the test cock to the test cock port. The intake stem defines an intake opening connected to the flowpath, the intake opening having a non-circular shape, such as a hexagonal shape. The test cock also includes an extraction tool having an end forming the non-circular shape of the intake opening, the end being sized to fit within and engage the intake opening.

Abstract: Catalytic converter anti-theft devices and systems are described.

Abstract: A two-piece clip for securing an element to another element includes a first component having a head and a shaft extending from the head along a shaft axis having a point. At least one protrusion is provided on the shaft, having a contact surface facing the head, and the head having a contact surface facing the protrusion. The clip further includes a second component having a support surface facing the contact surface of the head, and a contact surface facing the protrusion. The contact surface of the head is supported on the support surface of the second component.

Abstract: A device for torque limiting is provided, including a holding element for a nut or a screw head, the holding element including a top part having an entrainment profile in a rear area of the holding element for the rotatably fixed coupling of the top part with a setting tool, and the holding element including a receiving part having a receptacle in a front area of the holding element for rotatably fixedly accommodating the nut or the screw head. According to the invention, the holding element includes three torque-transmitting webs, which connect the receiving part and the top part and which form a predetermined breaking point. The invention also relates to a fastening arrangement made up of a device of this type and an expansion anchor.

Abstract: A device for torque limiting, which includes a nut and a holding element including a top part having an entrainment profile in a rear area for the rotatably fixed coupling of the top part with a setting tool. A receiving part has a receptacle in a front area of the holding element, in which the nut is rotatably fixedly accommodated. A device for torque transmission from the top part to the receiving part connects the top part and the receiving part and breaks at a limiting torque, interrupting the connection between the top part and the receiving part. The holding element includes at least one holding claw situated on the receiving part and securing the nut in the receptacle on the front side of the nut. A fastening arrangement made up of an expansion anchor and a device of this type for torque limiting as well as a method for manufacturing a device of this type.

Abstract: A device for torque limiting, has a nut having a female thread. A holding element includes a top part having an entrainment profile in a rear area of the holding element for the rotatably fixed coupling of the top part with a setting tool and a receiving part having a receptacle in a front area of the holding element, in which the nut is rotatably fixedly accommodated, the top part having a passage, through which a threaded rod screwed into the nut may be led out of the holding element through the top part along the longitudinal axis of the device. The holding element includes a web connecting the receiving part and the top part and which forms a predetermined breaking point. In at least one longitudinal sectional plane of the device, the smallest wall thickness of the at least one web is present on a line segment of minimum wall thickness, which runs at an angle greater than 45° with respect to the longitudinal axis of the device. A fastening arrangement includes the device.

Abstract: A spinal construct includes an existing spinal rod implant defining a rod dimension and having at least one mating surface. At least one extension includes a mating surface engageable with the at least one mating surface of the existing spinal rod implant to comprise a connection having a dimension the same as the rod dimension. A coupling member is configured to fix the existing spinal rod implant with the at least one extension. Systems, surgical instruments, implants and methods are disclosed.

Abstract: Fluid treatment assemblies comprising a plurality of adjustable tensioning rod assemblies comprising tensioning rods having a tensioning nut and a locking nut threadably attached to the tensioning rods, and methods of adjusting the tension on the assemblies, are provided.

Abstract: One or more techniques and/or systems are disclosed for a system for noninvasive adjusting fastener tensioning has an elongated shaft having a slot defined therein. The shaft has a first end oppositely disposed from the second end. An associated rod or rods may pass through each end. Selectively adjustable fasteners may have a plurality of magnets disposed in the head of the fastener. An external drive device generating a magnetic field may be used to rotate the fasteners via the magnets in the fastener head externally without the need for surgery. The fasteners may move in and out from the shaft and contact the rod to adjust tensioning.

Abstract: A bolt (1) includes a screw (3) and an insert (2) which can be inserted in the opening (19) of a wall (5). The insert (2) includes an insert head (6) and a shaft (7) including a recess (8), the insert head (6) and the recess (8) being configured such as to, after deforming the recess (8), crimp the insert (7) on the wall (5). The screw (3) includes a break ring (14) designed for engaging with the insert head (6), directly or indirectly, with a view to deforming the recess (8) by rotating the screw and thus to obtain the crimping, and designed such that, once crimping is complete, the ring breaks and releases the screw (3) from the insert head (6), thus making it possible to clamp an accessory (4) to the wall (5). The invention also includes an assembly method using a bolt (1) according to the invention.

Abstract: A torque controlling break screw is provided for securing a wire or cable within a connector. The break screw comprises a nut, a thin-walled, hollow screw and a torque limiting feature between the nut and the screw.

Abstract: A controlled torque fastener for use with a substrate includes a first driver engagement feature and a primary fastener portion connected to the first driver engagement feature. The primary fastener portion includes a threaded fastening portion and a second driver engagement feature connected to the threaded fastening portion. The first driver engagement feature is configured to be engaged by a first driver to enable the first driver to tighten the controlled torque fastener onto the substrate until the first driver engagement feature breaks off from the primary fastener portion. The second driver engagement feature includes a socket configured to receive a second driver and to enable the received second driver to apply a torque to the primary fastener portion.

Abstract: This method of tightening a threaded fastener (6) to a predetermined torque comprises steps in which: axial and rotational coupling is begun, by surface shrinking to a tight fit, of the threaded fastener (6) to a tightening member (2) capable of turning the threaded fastener (6) and thereby tightening it, the tightening member (2) and the threaded fastener (6) being able, from an initial coupled configuration between the tightening member and the threaded fastener, to remain rotationally coupled at a rotary drive torque, transmitted by the tightening member to the threaded fastener, that is less than the predetermined tightening torque, and to be rotationally decoupled from each other at a rotary drive torque, transmitted by the tightening member to the threaded fastener, that is equal to the predetermined tightening torque; and from this initial coupled configuration, a rotary movement is applied to the tightening member (2) up to a rotary drive torque, transmitted by the tightening member (2) to the threade

Abstract: The present invention relates to a security bolt understand a threaded bolt screw body (2) topped by an intermediate part (4) and a bolt head (3), joined together by weakened connections links (5, 6), the weakened connection (5) between the intermediate part and the bolt head torque being less resistant to torque than the weakened connection (6) between the intermediate part (4) and threaded body (2). A cap (8) covers the bolt head (3), the intermediate part (4) and the two weakened connections (5, 6), and is engaged in its lower region with a ring (7) positioned below the intermediate part, around the threaded body (2). The top surface of the cap (8) is formed with an lower formation (12) that cooperates with a formation (13) on the bolt head (3) to transmit rotation of the screw body. After a torque threshold, the first weakened connection (5) breaks, allowing the cap to rotate without transmitting the rotation to the screw.

Abstract: One or more embodiments of the present invention relate to a torque-limited attachment device, having a first head piece with at least one shaped element for the purpose of establishing a positive-fit connection to an attachment tool, and having a second head piece which has at least one threading, wherein both head pieces are connected to each other, forming at least one predetermined breaking point which breaks at a limit torque between the two head pieces such that a first breakaway surface, the same being functionally assigned to the first head piece, and a second breakaway surface, the same being functionally assigned to the second head piece, are created, and wherein at least the second head piece has a base material inside, the same having a corrosion-resistant surface coating.

Abstract: A bolt (1) includes a screw (3) and an insert (2) which can be inserted in the opening (19) of a wall (5). The insert (2) includes an insert head (6) and a shaft (7) including a recess (8), the insert head (6) and the recess (8) being configured such as to, after deforming the recess (8), crimp the insert (7) on the wall (5). The screw (3) includes a break ring (14) designed for engaging with the insert head (6), directly or indirectly, with a view to deforming the recess (8) by rotating the screw and thus to obtain the crimping, and designed such that, once crimping is complete, the ring breaks and releases the screw (3) from the insert head (6), thus making it possible to clamp an accessory (4) to the wall (5). The invention also includes an assembly method using a bolt (1) according to the invention.

Abstract: A polymeric fastener includes a body having multiple sides adapted to accept a tool for applying torque to the body to axially rotate the body with respect to a body longitudinal axis. A flange integrally connected to the body extends perpendicular to the longitudinal axis. A wave-shaped washer integrally connected to the flange has multiple valleys interposed between multiple oppositely directed peaks. Multiple triangular shaped frangible connectors integrally join the flange to the wave-shaped washer. Each frangible connector is integrally connected at a first end to the flange, and is integrally connected at an opposite connecting tip to an individual one of the peaks. The connecting tip has a reduced thickness compared to the first end to induce fracture of each frangible connector at the connecting tip.

Abstract: One or more embodiments of the present invention relate to a torque-limited attachment device, having a first head piece with at least one shaped element for the purpose of establishing a positive-fit connection to an attachment tool, and having a second head piece which has at least one threading, wherein both head pieces are connected to each other, forming at least one predetermined breaking point which breaks at a limit torque between the two head pieces such that a first breakaway surface, the same being functionally assigned to the first head piece, and a second breakaway surface, the same being functionally assigned to the second head piece, are created, and wherein at least the second head piece has a base material inside, the same having a corrosion-resistant surface coating.

Abstract: A fastener with a breakaway and methods of using the same. In one embodiment the fastener is a screw having a head and elongated stem, adapted to be easily manipulated by a user when using the screw as a fastener in a hinge or joint. A means of holding a screw by providing a breakaway tab or non-threaded second portion of the elongated stem which can be used to align and insert the screw into a screw hole in the process of engaging threads in the screw hole with threads of the screw. After engaging the threads in the screw hole, such as after the screw has been essentially completely inserted into the screw hole, the breakaway tab or non-threaded second portion of the elongated stem of the screw may be broken off at a breakaway and discarded.

Abstract: A screw with an integrated screwdriver, the screw having a screw shaft with a thread, a screw head, and a longitudinal axis, and the screwdriver being connected coaxially with the longitudinal axis over a specified breaking point with the screw head, characterized in that the screw head has an external thread.

Abstract: A retaining device is designed to retain a portion of an assembly device. The portion of the assembly device is released during failure of the assembly device. The retaining device includes a fixed part, a mobile part capable of sliding with respect to the fixed part, a housing, formed with both the fixed part and the mobile part, a return device, which can be compressed during a parts assembly operation. The return device can be relaxed when the assembly device fails, which causes sliding of the mobile part with respect to the fixed part, such that the portion of the assembly device is retained in the housing.

Abstract: A screw having a screw-threaded shank and a circular head, the head being provided with three radially extending screwdriver tip receiving portions defined between three first, off central integrally formed projections designed to become shaved-off the screw head by a pre-set force applied during tightening of the screw, and three second, integrally formed projections designed to withstand a shear force greater than the pre-set force applied during slackening of the screw.

Abstract: Fastener (1) includes a head (2) and a body (3). The head (2) has a transverse stop (5) able to bear on the first piece (23). The body (3) has a first spacer (10) and a second spacer (11), coaxial and disposed in line with each other in an axial direction. The first spacer (10), adjacent to the head (2), has a diameter greater than that of the second spacer (11) which extends starting from the first spacer (10), on the opposite side from the head (2). Each of the spacers (10, 11) has at least one lug (13; 18).

Abstract: An improved tool for use in association with a deformable nut of a fastener includes a socket having inner surface that forms a cavity on the socket. The inner surface includes one or more engagement surfaces that are tapered inwardly at an angle that approaches a taper of a deformable wall of the deformable nut. In one embodiment the tapering of the engagement surfaces is provided by configuring the engagement surfaces to extend in a tapered fashion generally toward a central axis of the socket. In another embodiment, the tapering is provided by configuring the engagement surfaces to each extend in a spiral fashion about a spiral axis that may, for example, be parallel and spaced-apart from the central axis of the socket.

Abstract: A sealing assembly designed to co-operate with a screw provided with a tightening slot by being mounted therein in such a manner that once said assembly is sealed the tightening slot is hidden in a manner that is not reversible except by destroying the seal, and further comprising a breakable drive suitable when the sealing assembly is subjected to a tightening action, for driving the screw in a tightening direction inside a receptacle provided for this purpose and for breaking once the screw becomes blocked, so as to prevent any loosening action being applied via the breakable drive.

Abstract: The present invention relates to a screw nut (10) for limiting an acting torque and a method corresponding thereto. The screw nut (10) has a threaded section (1) and a tubular section (2), where a predetermined breaking point (3) is arranged between the threaded section (1) and the tubular section (2), and where the threaded section (1) has a first shoulder structure (6) for a wrench and the tubular section (2) has a second shoulder structure (7) for an additional wrench.

Abstract: A concrete embedding anchor includes. An anchor including an anchor body having a head at one end of the shank and a stopper at the other end, a fitment concentrically mounted to said head and having an external thread and easy breaking portion formed on the round bar portion thereof, and a hemispherical shell-shaped former fitted with the middle portion of said anchor shank. A retainer is secured to the concrete form in advance, said anchor fitment is inserted into and screwed up to said retainer, said anchor is combined with the concrete form, then concrete is poured, and said concrete form is taken away after the concrete has hardened.

Abstract: A multiple diameter tangential set screw particularly for securing a rod within a hook shaped rod receiver includes a threaded mounting segment, a threaded rod engaging segment, and an abutment surface at a transition between the mounting segment and the rod engaging segment. The mounting segment has a larger diameter than the rod engaging segment and is received in a threaded bore formed in the rod receiver. The abutment surface has a concavely radiused surface of revolution. The rod engaging segment is positioned so that threads of the rod engaging segment cut into the surface of the rod to secure the rod from rotational movement. Engagement of the rod engaging segment and the abutment surface cooperate to urge the rod into frictional engagement with the rod receiver and to secure it from axial, radial and rotational displacement relative to the rod receiver.

Abstract: A torque lock/indicator including first and second members and a compression ring for sealingly contacting a surface of the first member. The first member has first and second contact surfaces and structure for generally axially accommodating a connector. The second member has a ring member and a plurality of extensions extending from the ring member, each extension has an angled first contact surface and a second contact surface proximate the first contact surface. The connector is tightened until the compression ring is compressed to a predetermined degree. As the compression ring is being compressed the first member first contact surface is slidingly displaced against the second member contact surface. When the connector has been tightened to a predetermined level of torque, the first member first contact surface has been displaced past the second member first contact surface and the first member second contact surface strikes the second member second contact surface generating a mechanical vibration.

Abstract: A torque shearing nut system and method incorporating a hybrid “twistnut” constructed of a metallic force bearing member and a thermoplastic rubber (Vyram®, etc.) and/or plastic (polyamide (nylon), polypropylene (PP), etc.) surrounding support member is disclosed. The present invention permits the use of one or more steel washer inserts formed to permit shearing of an external axial element for the purposes of ensuring the application of a predefined torque to the external axial member. The primary advantage of the present invention is one of cost, in that the present invention can be manufactured using stamped steel washers that are surrounded with and impregnated with molded thermoplastic rubber (Vyram®, etc.) and/or plastic (polyamide (nylon), polypropylene (PP), etc.). This encapsulation process is significantly less expensive than traditional hot-forging methodologies used to manufacture prior art twistnuts and the like.

Abstract: A robust rigid block forming a fastener and tamper evident seal attaches a cover to a tote bin. The seal is formed partially into a C-shaped locking device for insertion into aligned bores in the tote bin cover and bin. The C-shaped device is inserted to an insertion position and then displaced to a locking position with the legs of the device overlying the cover and bin members at the bores fastening the cover to the bin and capable of withstanding high shock loads. A locking element connected to the device by a frangible web has a camming surface that engages an edge of the cover for camming the device during insertion of the element in the bores to the insertion position at which time the web is fractured. The element has a flange plate attached to the element body by a weak web for selective removal of the plate. A resilient tang is attached to the element for engaging a mating locking recess in the body for locking the element to the device and to the bin and cover in the insertion position.

Abstract: The rivet includes a screw element which rotates within a body element. The body element includes an upper collar, integral with the body head, which is longitudinally stabilized with respect to the rotating screw element. The body element further includes a lower collar which is internally threaded and engages the external threads of the shank of the screw element. The lower collar therefore traverses a portion of the shank of the screw element as the screw element rotates. Folding legs join the upper collar and the lower collar. In the uninstalled position, the folding legs are parallel to and abut the screw shank. However, in the installed position, the lower collar approaches the upper collar and the legs fold so as to be substantially perpendicular to the screw shank.

Abstract: A locking device is disclosed for interlocking two members having aligned openings extending therethrough. The device includes a hollow cap and a pin with an enlarged head at one end and a nose at the opposite end. The pin is insertable through the aligned openings of the members, with its nose received in interlocked engagement within the cap, and with the two members captured between the cap and the enlarged head of the pin. A frangible portion of the pin is severable in response to relative rotation between its nose and enlarged head to thereby destructively disassemble the locking device.

Abstract: A pipe fitting comprises a fitting body with a longitudinal axis, having a pipe connection member for the sealed connection of a pipe and a thread for threadedly joining the fitting body to a connection unit, and a member on the fitting body to be driven by a tool, to which a tool for turning the fitting body about its longitudinal axis may be applied for threadedly joining the same to the connection unit. This fitting is provided with means between the tool engaging portion and the fitting body that limit the torque acting on the fitting body when the tool engaging portion is turned.

Abstract: A nut for use with an elongated rod having one end anchored by a hardened resin grouting mix in a drill hole in a mine roof or other such rock formation. The nut has a body portion with a threaded bore through which the rod is advanced and a dome-shaped wall surrounding one end of the bore in radially outwardly spaced relation and an annular lip defining an opening in coaxial, axially spaced relation to the one end of the bore. A metal disc, either solid or with a central opening of smaller diameter than the bore, is positioned in covering relation to the bore and surrounded by the dome-shaped wall. As the rod is advanced through the nut, the disc is moved into contact about its entire periphery with the inside of the dome-shaped wall and rotation of the nut is transmitted to the rod to mix the resin components within the drill hole.

Abstract: An improved set screw with a break off head for use in an osteosynthesis apparatus. The set screw comprising a head or stem preferably having a hexagonal external cross-section, a lower portion having a thread extending around an outer surface thereof and a shank connecting the head to the threaded lower portion. An outer diameter of the shank is equal to a minor diameter of the threaded lower portion, i.e. the outer diameter of the threaded lower portion at the base of the thread. A bore extends into the set screw from an upper surface thereof. The bore has a first bore section and a second bore section wherein the second bore section has a reduced diameter relative to the first bore section and is separated from the first bore section by an internal shoulder. The internal shoulder extends into the bore below an upper end of the thread.

Abstract: An improved set screw, for use in an osteosynthesis apparatus to secure and fix the spinal rod in the bore of the head of a bone screw, hook, connector or the like from translational or rotational motion, which comprises a head of hexagonal external cross-section and a lower portion having a threaded outer surface. A point is centrally formed on a lower surface of the set screw for penetrating into the rod and the point is preferably surrounded by a spaced and sharpened ring. In some embodiments a peripheral notch is formed between the head and the lower threaded portion of the set screw. A cylindrical bore comprising an upper bore section and a lower bore section is formed in the set screw such that the upper bore section extends through the head and the lower bore section extends partially through the set screw lower portion.

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 mine roof support system which includes a steel anchor rod and a threaded fastener. The rod has a threaded end portion, and which is adapted for positioning in a bore hole so that the threaded end portion projects outwardly from a rock face. The threaded fastener includes a body having a pair of opposing end portions and a bore which extends along its central axis. Internal threads complimentary to those on the rod are formed along part of the axial length of the bore, whereby the relative rotation of the fastener and rod moves the rod axially through the bore. A cap member is detachably coupled to one end portion of the fastener covering part of the bore. When coupled, the cap member acts as a positive stop which limits relative movement of the rod axially through the fastener bore, and which when detached allows the fastener to run freely along the threaded portion of the rod.

Abstract: A positive release bracket (16) for an object such as an electrical connector part (12) includes first and second semicylindrical shells (18,20) which are releasably held together by plates (36,38). On a separation force applied to the connector exceeding some predetermined maximum, one or both plates (36,38) are withdrawn from engagement with the shells (18,20).

Abstract: A self-locking internally threaded nut has a deltoid shaped locking section having circumferentially spaced protrusions. The protrusions form a surface adapted to be engaged by a deltoid driver which tightens the nut onto a bolt to a predetermined axial load. At the predetermined load the protrusions are plastically deformed inwardly on the nut so that the driver rotates freely on the nut. When the protrusions are inwardly deformed, the deformed material impinges on the bolt, thereby rotationally locking the nut on the bolt.

Abstract: An improved deformable locking fastener system comprises a fastener, a deformable collar and a dedicated installation tool. The fastener has a threaded exterior defining a plurality of axial flutes which are configured to prevent the collar from prematurely capturing the fastener during installation. The collar comprises a cylindrical forward portion, a central portion having an elliptical cross-sectional shape and a rearward portion having an elliptical cross-sectional shape. The collar portions have axial heights selected to maximize the strength of the collar and to minimize the weight of the collar. The installation tool contacts the collar along driving ridges which reduces the radial compression of the collar and increases the tangential driving force turning the collar during installation.

Abstract: A torque nut or screw that allows the nut to be tightened to a preset maximum torque, but prevents excess tightening. The nut or screw includes inner and outer threaded elements that extend along the same axis. The outer threaded element is tapered with respect to the axis. The fastener includes an inner fastening member (7) having fastening threads (8) and an outer female member (10) that is rotatable by means of a spanner, a pair of pliers, a screw driver, or other tool. The female member is connected to the inner fastening member by a coupling (13) having a sufficient strength to transfer to the inner fastening member a torque of a magnitude for which the fastening device is designed. The outer female member (10) is designed to be released upon tightening of the coupling and rotated relative to the inner fastening member (7), but not until the predetermined torque is exceeded. The coupling between the outer female (10) and the inner fastening member (7) includes a conical screw coupling.

Abstract: A tube nut torque limiting method and apparatus provides direct mechanical control of the maximum torque that can be generated when securing a tubular member within an internally threaded component. The torque limiting tube nut includes an externally threaded portion (14), a service head portion (16) and an installation head portion (22). A shoulder (24) is disposed between the service head portion (16) and the installation head portion (22) to mechanically control the maximum torque applied to the externally threaded portion (14). Upon separation of the installation head portion (22) at the shoulder (24), the installation head portion (22) includes a removal passage (40) for allowing the installation head portion (22) to simply be removed from the tubular member (28).

Abstract: A screw comprising, in succession between a first end and a second end thereof: a first polygonal head; a breakable neck; a second polygonal head; and a threaded shank; the diameter of the breakable neck being smaller than the diameters of the heads and of the shank, the screw further comprising a cylindrical bearing surface portion situated between the breakable neck and the second head, and having a diameter not less than that of the breakable neck, but less than that of the second head. A tool for tightening such a screw comprises a tightening endpiece including resilient means that project radially into the inside of the tube while they are in the free state, and that are capable of retracting to allow the first head of the screw to be inserted as far as the engagement portion of the tube and to co-operate with the cylindrical bearing surface portion of the screw when the first head thereof is in said engagement portion.

Abstract: An improved sliding bearing system for railroad locomotives having pedestal legs includes a channel-shaped unit of a wear resistant thermoplastic, including a base and two upstanding flanges ported with mounting apertures, plus two inserts made of strips of a more resilient thermoplastic, with one of the inserts mounted in the base adjacent to one of the flanges and the other insert mounted in the base adjacent to the other flange, so they are operable to compress and expand under loading variations, along with fastening members with undersized bosses relative to the diameter of the apertures in the flanges, operable to secure the unit to the pedestal leg in a manner that its flanges will slip on the associated pedestal leg under loading variations to accommodate the resiliency of the inserts, enabling the unit to shift on the face of the leg to better distribute the loading on the unit more uniformly, whereby the service life of the unit is extended.