Abstract: An aircraft turbomachine (10) comprising a gas generator (12) and a fan (14) located upstream of the gas generator and surrounded by a fan casing (16), the gas generator comprising a high-pressure body (12b) and a low-pressure body (12a) which is connected to a shaft of the fan (32), the high- and low-pressure bodies comprising compressors (22, 20) between which is located an intermediate casing (40) which connects the gas generator to said fan casing, the turbomachine further comprising first decoupling means (60) configured to disconnect the fan shaft from the low-pressure body, following a detection of a critical event, characterised in that it comprises second decoupling means configured to disconnect a blades stator from the compressor of the low-pressure body opposite the intermediate casing, these second fixing means comprising fusible means (62) for fixing the bladed stator to the intermediate casing.

Abstract: A coupling device provides a pre-tensioned coupling between a first member and a second member. The members are arranged to define a sealed compartment. A piston is housed within the compartment and is translated between the first member and the second member. A first ratchet lock is mounted within the second member and on translation of the piston, the first ratchet lock engages with the piston. A second ratchet is mounted within the second member and, on translation of the piston into the second member, the piston engages with the ratchet. The second ratchet is mounted on a piston, and translation of the second ratchet on the piston applies a tensile force to the first piston to tension or pre-tension the piston. As the ratchets substantially prevent reverse movement of the piston, the tensile force is retained.

Abstract: A locking screw for connecting two or more articles together is provided. The screw includes an externally threaded shaft, a head, and an elastic member. The head defines a chamber in which a spiral groove is defined. The shaft extends from the bottom of the chamber; and the elastic member is arranged around the shaft and one end of the elastic member is received in the spiral groove of the chamber and another end abuts against an article. The elastic member can be rotated around the longitudinal axis of the shaft, to change the length of the elastic member, so that enough tension is created to ensure locking the screw in place and prevent any rotation, thus maintain a tight engagement among the articles.

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: An internal combustion engine connecting rod is designed with bolts having a minimum required strength. A strength safety factor Sfa is calculated based on an axial strength limit load FX of the bolt and the maximum load FB to be born by the bolt due to a piston inertia force (Sfa=FX/FB) acting on the connecting rod. A mating surface separation safety factor Sfb is calculated based on the tensile load (FB?FC) resulting from the piston inertia force and the load FE carried by the bolts at a mating surface separation limit, i.e., the maximum bolt load FE at which the connecting rod main body and the cap remain in contact without separating (Sfb=FE/(FB?FC)). The mating surface separation safety factor Sfb of the connecting rod is set to be equal to or larger than the strength safety factor Sfa of the bolts (Sfb?Sfa).

Abstract: The turbine engine of the invention includes a rotor with at least one bearing, mounted on a bearing supporting part, said part being connected to the fixed structure by an uncoupling device, including at least one fusible screw passing through at least one bore, said screw comprising a head and a threaded portion, a fusible portion forming a preferential failure area, located between the head of the screw and its threaded portion. The screw comprises, between its threaded portion and its fusible portion, a portion for blocking the screw in rotation, cooperating with a complementary blocking portion provided in the bore. By means of the invention, the torsional torque related to the tightening of the screw is not transmitted to its fusible portion.

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 fastener system and method of inserting it, that includes a screw or bolt having two interleaved helical threads, which brackets or forms a groove for a helicoil. The helicoil expands and torques by various means to maintain hold and purchase between the screw coil combination and the substrate into which the screw and helicoil are inserted even when the substrate recedes a significant distance from the screw and helicoil combination. The fastener system includes means for latching the tilt of the coil so as to minimize the constraining forces and optimize the motion of the helicoil, that results in the screw or bolt being pushed into the substrate. The fastener may be actuated after it has been partly or completely turned into the substrate.

Abstract: A pull type swage fastener including a pin and a collar adapted to be swaged into a locking portion on the pin shank and with a removable mandrel being threadably securable in a pull cavity at the end of the pin shank and with the mandrel adapted to be gripped by an installation tool for applying a relative axial force between the pin and collar to swage the collar into the locking portion with the mandrel being releasable from the tool and removable from the pull cavity.

Abstract: A separable connector assembly includes a connecting member having a threaded end, and a hollow housing having a cylindrical wall that contains a body rotatably mounted therein. This body is threadably engageable with the threaded end of the connecting member. A first mechanism releasably restrains the body from rotating, and a second mechanism is included for winding a spring about the cylindrical wall of the housing. A third mechanism is included for releasing the spring. A fourth mechanism is included for restraining the threaded end from rotating. A fifth mechanism is included for applying a selected tensile load. When the load is applied, a thread geometry of the connecting member causes the load to be resolved as a torque applied to the body sufficient to cause the body to rotate enabling the connecting member to translate out of engagement with the body and subsequently separate from the body.

Abstract: A tension control arrangement including a plurality of cams disposed about an opening that accommodates a bolt to which a nut is intended to be secured. Each of the cams has a contoured outer surface, and each of the cams is rotatably supported such that the contoured outer surface operatively engages both the base and a contact member interposed between the cam and the nut. A lever assembly is operatively coupled to the cams, such that movement of the cams is substantially restricted to rotational motion from a first position in which the nut is engaged with the bolt and tightened by hand until it is seated against the contact member, to a second position in which the bolt is elongated to achieve a predetermined bolt tension.

Abstract: A bolt made from shape memory alloy that exists in a first state and is capable of changing to a second state when heated and remains in that second state even when cooled is used to self torque itself and clamp a first fixture to a second fixture. Preferred methods for using the self-torquing bolt are disclosed.

Abstract: A fastener assembly 10, in respect to forces which are subsequently applied, after the installation thereof, when forces is applied in one direction, this fastener assembly 10 is self adjusting incrementally, as needed in travel or actuation; yet when a force is applied in the opposite direction, this fastener assembly 10 is not self adjusting and there is no travel or actuation.

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 threaded fastener has a bolt, a nut including at least one sleeve in which the bolt is threadingly engaged, and a washer having a lower bearing surface adapted to bank on a surface of one of at least two elements to be connected with one another by the threaded fastener, the washer being pressed-fit on a part of the threaded fastener, so that when an active force and an opposite reactive force are applied to parts of the threaded fastener, the washer does not turn, while the bolt also does not turn but moves only in an axial direction.

Abstract: A fastening bolt fastens flanges between a bolt head and a nut attached on the threaded portion of the shaft via spherical washers. The fastening bolt has a cavity formed within the shaft. By application of pressure in the cavity with a hydraulic fluid supplied through a hydraulic pressure port in a plug, the shaft is extended and the fastening bolt becomes unfastened condition. In the unfastened condition, a gap is created between flange and nut, and the nut and the fastening bolt are free to rotate each other, therefore, the nut can be removed easily by hand from the fastening bolt, even the bolt is large in size. The fastening force is adjustable by the width of the gap before releasing hydraulic pressure in the cavity. By releasing hydraulic pressure in the cavity, the fastened condition is obtained. Conversion between fastened condition and unfastened condition can be made quickly and easily.

Abstract: A method of producing and checking a screw connection of parts by a screw under the effect of a predetermined initial tension force. Moreover, a connecting device controls the sequence of process steps automatically. A screw is especially designed for the use together with the connecting device. The effective initial tension force within the screw shaft is measured during production of the connection by a pulling force measuring device, for instance a wire strain gauge, arranged at a screw head pulling device of the connecting device. A predetermined initial tension force can be produced first by pulling on a screw head, and then maintained by tightening the screw so far that the screw head contacts a contact area outside of one of the parts to be connected.

Abstract: A high temperature bolting system for clamping steam turbine housings and similar high temperature parts together while operating at a temperature of 800° F. to 1200° F. An elongated fastener shank and housing material have similar coefficient of thermal expansion. The shank has a tensile strength several times greater than the housing to maintain a clamping force during thermal excursions. The diameter of the shank is reduced due to the large creep strength difference between the elongated fastener shank and the clamped parts. The reduced shank diameter allows an increased in the clamping load by providing an increased surface area in the clamped part. A stress generating flange is provided with jackbolts to establish the clamping load at room temperature. A threaded sleeve is interposed between the threads at the end of the shank and the threads of the housing so that the housing threads have a sufficiently large area for withstanding the clamping load.

Abstract: A fastener system includes a screw or bolt which can be attached in a helicoil. The helicoil expands and torques by various means to maintain hold and purchase between the screw coil combination and the substrate into which the screw and helicoil are inserted even when the substrate recedes a significant distance from the screw and helicoil combination.

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 fastener (1) for connecting at least two components includes a shank (4) having an axis. At least one threaded portion (7) is arranged at the shank (4), and it has a stressed cross section. At least one elongation portion (5) is arranged at the shank (4), and it has a stressed cross section. The stressed cross section of the at least one elongation portion (5) is less than the stressed cross section of the at least one threaded portion (7). At least one fitting portion (6) is arranged at the shank (4). It has a stressed cross section, and it includes a plurality of protrusions (9) and channels (10). The at least one elongation portion (5) and the at least one fitting portion (6) are spaced apart along the axis of the shank (4). The channels (10) have a root diameter determining the stressed cross section of the at least one fitting portion (6).

Abstract: A bolt for connecting two parts with one another has a bolt member having an axis, a threaded portion provided with a thread, and another portion having a polygonal circumference, a friction washer non-rotatably connected to the polygonal circumference of the other portion of the bolt member and having a first facial area adapted to abut against a facial area of one of the two parts and also having an opposite second facial area, a sleeve connected to the thread of the threaded portion of the bolt member and having a facial area abutting against the second facial area of the friction member, means provided on the sleeve for applying a given force, and means provided on one of the bolt member and the friction washer so as to apply a given force in an opposite direction to the sleeve, so that when a given force is applied in one direction to at least one of the bolt member and the friction washer through the means on the at least one bolt member and the washer and a given force is applied in an opposite directi

Abstract: A bolt for connection two parts with one another has a bolt member having an axis, a threaded portion provided with a thread, and another portion having a polygonal circumference, a friction member connected to the polygonal circumference of the other portion of the bolt member and having a first facial area adapted to abut against a facial area of one of the parts, and also having an opposite second facial area, and a sleeve connectable to the thread of the threaded portion of the bolt member and having a facial area abutting against the second facial area of the friction washer, so that when a given force is applied in one direction to the bolt member and a given force is applied in an opposite direction to the sleeve, only the sleeve turns while the bolt member is elongated or relaxed.

Abstract: A high temperature bolting system for clamping steam turbine housings and similar high temperature parts together while operating at a temperature of 800° F. to 1200° F. An elongated fastener shank and housing material have similar coefficient of thermal expansion. The shank has a tensile strength several times greater than the housing to maintain a clamping force during thermal excursions. The diameter of the shank is reduced due to the large creep strength difference between the elongated fastener shank and the clamped parts. The reduced shank diameter allows an increased in the clamping load by providing an increased surface area in the clamped part. A stress generating flange is provided with jackbolts to establish the clamping load at room temperature. A threaded sleeve is interposed between the threads at the end of the shank and the threads of the housing so that the housing threads have a sufficiently large area for withstanding the clamping load.

Abstract: A hold down device and method for connecting two building elements of a building comprises an elongate member, typically in the form of a rod or a cable, that is connected between the two building structures. A tension compensator, which includes a housing, is mounted to the elongate member to compensate for wood shrinkage of the building. One end of the elongate member penetrates the housing and is releasably connected to the housing by means of a gripping assembly which permits only one way movement of the elongate member into but not out of the housing to resist tensile forces between the two points of the building but allow the elongate member length to be adjusted as the distance between the two points decreases due to wood shrinkage. An urging mechanism urges the end of the elongate member further into the housing if the tension on the elongate member falls below a predetermined level. The urging mechanism, in some embodiments, has to be put under compression.

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: An apparatus for reducing the bending stress imparted to threaded fasteners in flanged connections is disclosed. The apparatus includes a stress reducing washer positioned between the head of the threaded fastener and a counterbore in the backface of the flange. In a first embodiment, the stress reducing washer uses a tapered upper surface oriented with respect to the flange to compensate for flange deflection as the threaded fastener is tightened to a predetermined torque value. Second and third embodiments utilizing spherical and cylindrical surfaces are also shown. A fourth embodiment eliminates the need for the stress reducing washer and machines the tapered surface in the backface of the flange.

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 hanger assembly for attachment to heavy loads in material handling systems such as overhead conveyors where the hanger must be angularly aligned with the conveying element such as an attached cable. The hanger includes a base, a threaded stud for load attachment, and a hanger such as the eye in an eyebolt assembly, an example of a hanger assembly. A washer positioned around the threaded stud between the base and the load is hardened substantially less than the hanger itself enabling the hanger to be rotated up to 180 degrees after initial tightening without over torquing the threaded stud. The washer has a plurality of radial slots in one face that maintain the structural integrity of the washer under high rotational and compression loading.

Abstract: A method for connecting piping system components, such as a valve and a pipe fitting, using a pair of half-height nuts in place of a single full-height nut on each stud. Each first half-height nut is torqued on its associated stud while a stud tensioner exerts an axial pull on the stud. Each second half-height nut is torqued onto the stud, using a standard torque wrench, after the stud tensioner is removed. The two nuts together produce a combined nut strength capable of withstanding the tensile force on the associated stud.

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: The device (15) for joining together a first plate (7) and a second plate (8)of the baffle assembly, which are located substantially at right angles, includes a screw (16) engaged in a housing consisting of an opening (18) passing through the first plate (7), and of a tapped blind opening (20) in the second plate (8). At least one opening (21) places an annular space (18b) around the shank (16b) of the screw in communication with the entry part (18a) of the opening (18) passing through the first plate (7), in order to deconfine the screw (16). The opening (21) may be a radial opening passing through a cup (17) against which the screw head (16a) comes to bear or an opening machined in the first plate (7) against a shoulder (18c) of the screw housing and the part (18b) of the opening for passing through the first plate (7) in which the shank (16b) of the screw (16) is engaged.

Abstract: A threaded fastener and a method by which the fastener exhibits sufficiently enhanced fatigue strength so as to be suitable for use in gas compressors and turbines operating at relatively high service temperatures. The method entails a selective heat treatment to achieve a dramatic improvement in fatigue properties while not interfering with other required properties for the fastener. The heat treatment process preferentially develops a case-hardened region in those threads nearest a transition region between the threads and an unthreaded portion of the fastener. In contrast, the unthreaded portion and the threads furthest from the transition region need not be case-hardened. The hardening pattern in the threads yields a martensitic steel fastener that exhibits fatigue properties which are dramatically superior to otherwise identical fasteners.

Abstract: A method and apparatus for separably connecting a first surface to a second surface. The apparatus includes a connecting member provided with a threaded end. A rotatable body threadably engagable with the threaded end is rotatably supported against the first surface for rotation about the threaded end to separably connect the connecting member. The rotatably supported body and the connecting member are restrained from rotation. The connecting member and rotatably supported body further have a selected matching thread geometry such that a tensile load applied to the member when connected with the rotatably supported body is resolved as a torque applied to the rotatably supported body sufficient to urge the body to rotate. When the rotatably supported body is released and allowed to rotate, the threaded member translates and threadably disengages the rotatably supported body to separate the connection.

Abstract: A load indicating fastener composed of a body (2) having an abutment (9) which is moved by the changing length of the body (2) under an applied load, and a load sensing member (10) composed of an element (11) disposed in the direction in which a load is applied to the body (2) when the fastener is in the user characterized in that the element (11) is of elongated U-shape, a first limb (13) of the U providing an anchorage part (14) which is rigidly anchored to the body (2), the closed end of the U providing a bearing part (15) which bears on the abutment (9) so as to move with the abutment relative to the anchorage part (14) in response to a load applied to the body, and a second limb (16) of the U having an indicator (17) at its outer end which responds movement of the bearing part (15) and registers the applied load related to that movement on a scale (19).

Abstract: A spring washer for the securing of screws, nuts and the like is provided with an essentially ring-shaped washer body of a determined thickness having a washer top side and a washer under side, the washer under side being subdivided into an outer ring surface and an inner ring surface. The washer in an unstressed state rests with the outer edge of the outer ring surface on a flat base and the outer ring surface and the inner ring surface forms an acute angle with this base. The washer under side (2) is subdivided by a circular groove (3) into the outer ring surface (4) and the inner ring surface (5) and the spring washer is shaped in such a way that the outer ring surface (4) is arched inwards and forms a smaller acute angel (.alpha.) with the flat base (7) than the inner ring surface.

Abstract: A method and apparatus for tying building components together or to the ground utilizes a system of spring-tensioned cables strung between the foundation and the top corners of any shear diaphragm. The cables are kept under tension regardless of the shrinkage of wooden components, providing evenly-distributed compression on the structure's framing members.

Abstract: A slotted conical (non-flat) spring washer with an encircling ring provides improved spring washer performance. A split or slotted conical spring washer is encircled by a retaining ring that prevents the ends of the washer adjacent to the slot from expanding as the washer is compressed. The ends of the washer on both sides of the slot move to prevent the washer material from exceeding its yield strength. The ring restricts the radial movement of said outside diameter of the washer strip away from a center axis of the washer bore. The ring can be a counter bore in a member to be clamped, a retaining washer having an outside annular washer to act as the ring, or can be integral with the spring washer such that the slot appears not to pass completely through the washer strip.This slotted conical spring washer greatly increases the elastic spring travel available during repeated clamping cycles and during movement of clamped members due to differences in rates of thermal expansion and thermal gradients.

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 spacer washer 20 (FIG. 2) for disposing between a nut and a turbine casing flange (16, 12 FIG. 5) has a foot end 24 corresponding to the footprint of the nut and extends with wall thickness 25 in one radial direction 28 no further than the nut footprint, to permit minimum spacing pitch, but extends in the orthogonal direction 29 with greater wall thickness 30 to provide support outside the nut footprint for a hydraulic bolt tensioner in a plane displaced from the flange and possibly overhanging part of the casing. The length of the spacer washer may vary from bolt to bolt along the flange to bring nuts from a stepped flange to the same plane and/or increasing the effective bolt length to the nut enables tensile stress to be introduced easier and more accurately.

Abstract: Torque limiting bolt employs a number pins which shear upon the application of a predetermined torque to the bolt head. The bolt configuration insures that sheared portions of the pins are held within the bolt head to prevent undesirable scattering of the pin portions on an airstrip. A removal hex head is thinner than a driving hex head positioned over the removal hex to discourage the application of a wrench directly to the removal head. The outermost portions of the hex heads are also angularly displaced from each other for this purpose.

Abstract: A load indicating fastener such as a bolt (10) or stud, has a shank (12) which is subject to tensile loading in use. The shank (12) has an axially extending bore (22) which receives a first gauge pin (30) anchored at its inner end (32) to the shank (12) and protruding outwards beyond an end face (16) of the fastener. An indicating member (40) is rotatable on the protruding portion of the gauge pin (30) between the end face (16) of the fastener and the head (34) of the pin (30), so that the indicating member (40) is free to rotate when the shank (12) of the fastener is unstressed but when the shank (12) is subject to a predetermined tensile loading is held against rotation by contact with the end face (16) of the fastener. A second gauge pin (42) is received within an axially extending bore (36) in the first gauge pin (30) and is anchored at is inner end and protrudes outwards beyond the outer end of the first gauge pin (30).

Abstract: A fastener which allows a user to easily utilize the Torque Angle Method to provide a predictable clamp load to a clamped element. The fastener includes an externally threaded shank portion, a torque receiving portion integrally connected on one end of the shank portion and a radially extending flange located between the shank portion and the torque receiving portion. The flange includes a pair of cut-out notches located on the peripheral edge of the flange which are formed prior to initial tightening of the fastener and are spaced apart at a predetermined angular distance to allow a user to utilize the Torque Angle method to provide predictable clamp load across a joint connection.

Abstract: A cam action clamp for use against a fixed clamping surface comprising a threaded shaft extending outwardly from the fixed clamping surface and a movable clamping member having a channel therethrough to allow the clamping member to be mounted on the threaded shaft for slidable movement along the shaft. A thrust plate is affixed to the movable clamping member adjacent the channel. A mounting block is threadably mounted on the threaded shaft and a clamping handle is pivotally mounted to the mounting block. The handle is formed as a cam member that abuts the thrust plate. Pivoting the handle causes the cam member to engage the thrust plate to slidably advance the movable clamping member along the threaded shaft toward the fixed clamping surface in order to clamp an article between the surfaces. The mounting block can be rotated along the threaded shaft to vary the distance between the clamping surfaces.

Abstract: In order to interconnect two subassemblies (12, 14), which must be rapidly disengaged, use is made of a mechanism having two rods (36, 44) arranged end to end and which are normally linked in rotation and translation by unlockable connecting means (56, 64). A first (36) of these rods is mounted in a cylinder (14) connected to a first subassembly and has an operating head (38) accessible from the outside of the cylinder. The second rod (44) has a thread (50) screwed onto the second subassembly (12). This arrangement makes it possible to easily fit the mechanism by actuating the operating head (38). A piston (20) mounted in the cylinder (14) controls the unlocking of the connecting means.

Abstract: A washer for securing screws, nuts or the like has substantially ring-shaped inner and outer washer bodies as well as a transitional region between the bodies. Each washer body has a conical surface at the supported side of the washer and the outer body continuously merges into the inner body in the transitional region at the supported side. The transitional region has a smaller cross section than the adjoining parts of the inner and the outer bodies.

Abstract: A removable threaded fastener is provided which comprises a head component; an externally threaded shank component; and a resilient linking means connecting the head and shank components. The fastener has a longitudinal opening adapted to receive a tool for the application of torque in a driving engagement with the shank component without an integral torque transfer means. Also provided is a method for removably fastening a work piece using the removable threaded fastener by inserting the fastener through a threaded aperture in the work piece; inserting the tool into the longitudinal opening; applying torque to the shank component sufficient to cause axial displacement of the shank component against the resilient biasing of the linking means to maintain the head and shank components in axial tension; and removing the tool.

Abstract: A bolt for attaching a first member to a second with a desired compressive force. The bolt has a cylindrical body with a threaded section on a first end and a head on a second end. The cylindrical body had a longitudinal bore which extends to a cross bore in the head. A pin located in the cross bore has a first flat surface separated from as second flat surface by a shoulder. A rod located in the longitudinal bore has a first end fixed to the cylindrical body and a second end that is located on the first flat surface. A spring acts on the pin to hold the shoulder against the rod. An input torque applied to the head causes the threads to move into threads on the second body. When the head engages the first body, further torque results in expansion or elongation of the cylindrical body. The rod freely moves in the longitudinal bore and when a predetermined elongation occurs corresponding to the depth of the shoulder on the pin, the spring moves the pin to align the second flat surface over the rod.