Abstract: A detachable ring has a safety collar having an inner thread, an annular lower end and a taper upper end, and a main body having a first end having an end flange and a second end having an annular block and an outer thread. The inner thread of the safety collar engages with the outer thread of the second end of the main body. The annular block blocks the annular lower end of the safety collar. The taper upper end of the safety collar encloses the end flange of the first end of the main body.

Abstract: A hook fitted with a device making it possible to see whether or not it has been subjected to tensile stress is described. The hook is characterised in that it is fitted with a safety ring set in the passage orifice for the line with a certain clearance so as to receive the latter and to support the tensile stress which might be exerted on the hook if the user falls, being maintained in this orifice in a position in which the clearance is essentially located on the side of the tensile stress and is so by means of a gudgeon, having a diameter smaller than the clearance, inserted in a straight end-to-end bore passing through the outwardly turned edges of the safety ring and the body of the hook so that the gudgeon breaks when subjected to tensile stress greater than a predetermined threshold stress.

Abstract: A shackle or clevis for hooking to the link of a chain, of the type comprising an external support half-ring formed by an arch of the half-ring and by two legs of the half-ring which originate from the opposite ends of said arch, each of the two legs having the terminal end widened and provided with a transverse hole which, in the position of closure of the shackle, is aligned with the transverse hole of the other one; and a bolt, possibly unlosable, slidingly supported in the hole of a leg so as to be inserted in the hole of the other leg, provided with means for locking dosure of the shackle; said shackle also comprises inside the support half-ring a fork which can be inserted on a diameter of the two straight sides of the link of chain to be hooked and which can be clamped between the links chained to said chain link to be hooked, said fork having each leg integral with and parallel to a corresponding leg of the support half-ring and mouth lying on the side of the bolt.

Abstract: In the case of a connecting chain link having two connecting-link parts (1, 2) which are locked in place in the closed position by means of a bolt-shaped locking element (12) which rests in a holder (11) formed by the connecting-link parts (1, 2), the locking element (12) has, in addition to a central spring lock washer (19) which is used to secure its axial position, two further spring lock washers (23, 24) which are arranged in the region of its end and prevent tilting movements of the locking element (12) in the holder (11).

Abstract: A safety shackle having a modified U-shaped design comprising first and second arms, first and second cusps, a first slot disposed between the first arm and the first cusp and a second slot disposed between the second arm and the second slot, and a working area disposed between the first and second cusps. A designated chain link is introduced with within one of the slots and is locked within the slot by orienting the contiguous chain links in a plane perpendicular to the designated chain link, thereby locking the chain link within the slot.

Abstract: A shacke and clevis pin are provided whereby the shackle and clevis pin cannot be separated from each other. It is possible to attach a cable or a chain or a rope to the shackle. It is also possible to attach a cable or a rope or a chain to the clevis pin. The clevis pin and the shackle join to ropes and/or cables and/or chains together. There is a provision for precluding the clevis pin from being withdrawn, completely, from the shackle. Also, there is provision with the shackle and clevis pin so that one operator can connect a cable or cables to the shackle and clevis pin thereby eliminating two operators in operating the shackle and clevis pin. The spring urges a locking lever to lock the clevis pin and shackle together and to preclude the rotation of the clevis pin and shackle with respect to each other.

Abstract: A master link for a standard chainwheel chain, having a substantially planar shackle body having a bore located thereon and first and second extensions extending from the shackle body and terminating at respective ends thereof. The extension have longitudinal axes and are twisted about 90.degree. along their longitudinal axes. The respective ends of the extensions have bores therethrough. A tab member is positioned parallel to the shackle body and has a bore therein in substantial alignment with the bore in said shackle body. A 180.degree. bent portion connecting said shackle body and said tab member. A first pin connects said bores in the extensions and a second pin connects the bores in the shackle body and the tab member.

Abstract: A clamp assembly including a flexible restraining element having a first end and a second end, the flexible restraining element receivable about an irregularly-shaped item carried upon a work surface, a brace for engaging the first end of the flexible restraining element to the work surface and a coupler for engaging the second end of the flexible restraining element to the work surface and for adjusting the flexible restraining element about the irregularly-shaped item for clamping the irregularly-shaped item to the work surface.

Abstract: A coupling link for coupling two chain end portions to each other. The link body (1) is elongated with a length corresponding to at least twice the greatest width thereof, the link body being widest at a central portion. Each opposite end portion (2, 3) of the link body is formed as a fork-like portion with a transversal anchoring pin (7) for securely anchoring an end link of the associated chain end portion, whereas the central portion (4) of the link body is provided with a central opening (12) permitting insertion of a desired chain link (102) so as to enable the formation of a non-loaded shortening loop of at least one of the two chain end portions.

Abstract: According to the invention this component includes a shackle of conventional type, that is to say which has a U-shaped body of substantially uniform diameter, and includes an insert made of synthetic material overmolded on the rounded end and on the base of the side arms of the shackle, this insert including a central part of circular shape, of greater diameter than that of the body of the shackle, and side bulges demarcating, with this central part, a groove for receiving a rope.

Abstract: A sprocket chain link designed to connect opposing link ends of a handwheel sprocket chain having a detachable grasping end and a detachable bit end. The sprocket chain master link is used to facilitate replacement or length alterations an existing handwheel sprocket chain used to turn a sprocket handwheel for opening and shutting piping valves. The detachable grasping end of the sprocket chain master link is used to hold a link end portion of a standard handwheel sprocket chain link while the detachable bit end of the sprocket chain master link holds the loop end of a standard handwheel sprocket chain link. While attached to a handwheel sprocket chain, the sprocket chain master link rotates around a handwheel sprocket performing the same function as the attached standard handwheel sprocket chain links.

Abstract: A safety retainer for preventing disengagement of a shackle bolt from a U-shaped shackle. The retainer includes a collar member and a pin member. The tubular collar member surrounds the head of the shackle bolt and is provided with a pair of holes through its walls, coaxially alignable with an aperture in the shackle bolt head, and a notch cut out of the wall of one end thereof for engagement with one arm of the shackle. The pin member is insertable through the pair of collar member holes and the shackle bolt aperture to prevent rotation and disengagement of the shackle bolt from the shackle.

Abstract: A shackle including a clevis (10) and a lock pin (12). Clevis (10) includes eyes (16, 18). Eye (16) includes ramps (30). Lock pin (12) includes a head portion (42), radial flange (48), shank (46), coil spring (62), and lock member (60). Lock member (60) includes detents (64, 66) adapted to engage ramps (30). Coil spring (62) biases lock member (60) toward flange (48) so that detents (64, 66) are in a "lock" position and engage ramps (30) when lock pin (12) is threaded into eyes (16, 18).

Abstract: A connector (10, 110) for joining a plurality of elements (15, 20; 115, 120) having attachment apertures (19, 21; 119, 121) therein including, a pin (25; 125, 125') having a radially extending head (27; 127) and a shank (26; 126, 126') extending axially from the head and having a tapering outer surface (29; 129, 129') over at least a portion of the axial extent thereof, a sleeve (35, 135) insertable in the attachment apertures and having a tapering inner surface (38; 138, 138') over at least a portion of the axial extent thereof for engaging the tapering outer surface of the pin, a discontinuity (37, 137) in the sleeve extending at least a portion of the axial extent thereof, and fastener (45, 50; 145, 150) for axially displacing the sleeve relative to the pin selectively to expand and to permit reduction in the diameter of at least a portion of the outer surface of the sleeve.

Abstract: A marine mooring swivel fitting for connection into a mooring line is a generally dumbbell-shaped element having a relatively slender elongate neck with outward enlargements at the opposite ends of the neck respectively and a mooring line attachment on at least one end of the element. In use the attachment may connect the fitting in the mooring line, the slender elongate neck being adapted laterally to receive swivelly therearound one or more conventional shackles. Such a shackle, depending on whether the swivel is at the upper or lower end of the mooring line, may be secured to a pendant made fast to a marine craft on the surface or secured to an anchoring device. The enlargements, larger than the opening in the shackle, serve to limit the longitudinal movement of the shackle on the element without limiting rotational movement of the shackle around the element.

Abstract: A closure pin extends through aligned openings in first and second spaced apart eyes at the open end of a substantially U-shaped clevis. One end of the closure pin is threaded and mates with threads in the opening in the second eye. The closure pin includes a head portion and a radial flange at its opposite end, and it carries a releasable lock member. The releasable lock member includes a pair of detents which are positioned in radial slots in the flange. A spring biases the lock member into a position in which the detents extend axially beyond the radial flange towards the threaded end of the pin. A plurality of lock ramps are provided on the outer face of the first eye. The ramps are spaced circumferentially apart.

Abstract: A chain joint for round-link chain, particularly cutting chain, includes chain link arc members and chain link side members connecting the chain link arc members. Bearing members are provided on one side of the chain link arc members. The bearing members have threaded bores and a threaded bolt can be screwed into the threaded bores to form one of the chain link side members. The chain joint is without tension and meets the requirements of a true chain link and can be integrated into the dimensions of a round link chain.

Abstract: A locking pin and clevis wherein a slidable lockable member engages one end of the pin to lock it and a spring can be locked to said slide member to prevent it from moving to the unlocked position. The spring can be disengaged with the slide member to allow the slide member to be moved to the unlocked position so that the pin can be moved out of engagement with the one end of the clevis.

Abstract: A shackle of cast metal defines a threaded bore for a cast pin. The shackle is specially shaped to define a circular locus for a joined link whether said link contacts shackle body, ear or pin.

Abstract: A lockable, pin-retaining coupling comprising a clevis having a bore extending therethrough and a pin slidably positioned within the bore. A brake restrains movement of the pin within the bore. Stops adjacent opposite ends of the pin prevents the pin from being removed from the bore.

Abstract: A fusible link has a tubular housing having a recess in one side thereof in communication with a bore at one end of which one end of a thermally sensitive strut is seated. A yoke has at one end thereof an arm against which the opposite end of the strut seats. The strut resists relative movement of the housing and the yoke until such time as the strut collapses whereupon the arm is cammed out of the recess enabling separation of the housing and the yoke.

Abstract: A method and apparatus for towing an offshore structure which is protected from damage caused by ice impinging on the walls of the structure when the apparatus is not in use by positioning a retractable towing shackle within a recess in an outer wall of the structure.

Abstract: A shackle safety keeper for keeping the threaded eye bolt of closing a U-shaped shackle from rotation of the eye bolt and ultimate disengagement of the shackle. The shackle safety keeper is a single wire continuously bent to form the disclosed keeper. This wire is bent intermediate its two ends at a bowed spring portion. This bowed spring portion has two depending shackle engagement sections extending downwardly and at right angles from the bowed spring portion. These sections are for clamping to the side edges of the U-shaped shackle adjacent the protruding eye on the shackle bolt. The lower end of each shackle engagement section has protruding angularly outward therefrom two eye reaching legs. These eye reaching legs extend from the bottom of each shackle engaging section out into registry with the eye on the protruding bolt when it has closed the shackle. The two eye reaching legs end the all wire constructed keeper with two opposed and overlapping eye piercing lugs.

Abstract: A chain lock for round chain links, particularly for use in mining, consisting of preferably congruent part links, a center portion and a locking pin. The center portion is supported on cylindrical surfaces which form the base of a recess. The recess is provided in either inner side of the inner shank of the part links and undercuts both outer sides of the shank attached to it. The center piece has cylindrical supporting surfaces on opposite sides, and a pair of flat surfaces which are pierced by the cylindrical-surfaced supports. The ends of the center piece are supported in the receiver of the shanks when the center piece is inserted. The pin pierces the center piece at an angle and protrudes with its ends above and below the surfaces of the center piece to prohibit it from being rotated.

Abstract: A pair of knuckles each including a base element and a pair of transversely spaced longitudinally extending lugs on the base element. The lugs on each knuckle are pivoted in a pair of lugs secured to the frame of one of the leading and trailing equipment units, the two knuckles being positioned on relatively transversely positioned axes. The knuckles are interconnected by a longitudinal pin extending through the base elements, the longitudinal pin being dimensioned to enable longitudinal play between the knuckles, and relative angular movement therebetween.

Abstract: In a chain joint which consists of two identical, essentially U-shaped joint halves (1,2), the outer legs (3) and the inner legs (4) of the joint halves are provided with holding teeth (14-16 and 17-19 respectively). The holding teeth are here designed with unequal thickness, in such a way that certain pairs of holding teeth (15, 18) absorb a greater load than the other pairs of holding teeth (14,19,16,17). Due to the chosen arrangement, those zones of the outer legs (3) which are located most closely to the shackle base (9) of the joint halves (1,2) are noticeably relieved, and a premature rupture of the chain joint is prevented in this way.

Abstract: A resilient clip selectively engaging portions of a loop type shackle, and the removable locking pin therefor to prevent accidental disengagement through loosening of the pin. The clip may be engaged and disengaged without the use of tools, and may be temporarily resiliently attached to the body of the shackle when not in use. The clip includes first and second clip members interconnected at substantially a right angle by a medially positioned neck portion.

Abstract: The endless band-like portion of a chain for the tires of heavy duty automotive vehicles is assembled of substantially square main links and U-shaped shackles. Each link has a base plate which engages the tread of the tire and an outer plate which engages the ground and is spaced apart from and defines with the base plate a compartment containing projections which extend from the base plate and/or outer plate and serve to engage and retain detent members on the legs of the shackles. Each link has at least one yoke disposed in a plane extending at right angles to the respective plates and engaging the web of a shackle whose legs are anchored in the compartment of a neighboring link. At least one leg of each shackle has a spur which cooperates with the web of an adjacent shackle to prevent the extraction of legs from the compartment wherein the legs are anchored as a result of engagement of their detent members with the projections of the respective link.

Abstract: A joining shackle or link is provided for joining link chain sections and comprises a link shaped assemblage of members including a detachable member or members enabling the joining link to be fitted on the chain sections. Opposed U-shaped parts (1,2) of the assemblage have abutting flanges (3) provided with wedge surfaces (4)and the assemblage is held together by couplers (5) which preload the wedge surfaces and the flanges. This preloading of the joining shackle enables the shackle to better withstand cyclic loading. Two separate U-members (1,2) are preferably present and provide opposed pairs of abutting flanges (3), and the couplers comprise half shells (6) fitting over mid-portions of the U-members and drawable together by screws (8) for preloading of the flanges.

Abstract: The invention relates to a clevis structure having transverse pins for a universal coupling effect. The structure is an assembly of mechanically interlocking components which can be individually fabricated and releasably joined without load carrying fasteners, welding, or the like. The components are readily fabricated even in relatively large sizes.

Abstract: A pin locking assembly for a shackle or the like wherein a pin is non-rotatably mounted in a member and is equipped with a plate rotatably mounted on one pin end for movement between removable and non-removable positions, and removable lock means releasably fixing the plate in non-removable position relative to the pin.

Abstract: A chain shackle has a U-shaped body with flat parallel limbs interconnected by a bight portion with a longitudinal slit accommodating an end link of a chain which is engaged inside the shackle by a half-link resting against the inner surface of the bight portion. The half-link has an integral lug which is traversed by a pin laterally offset from the slit serving to hold that half-link in a chain-retaining position.

Abstract: A novel swivel locking device is described comprising a swivel portion having a means for joining two members wherein at least one of said members includes two portions extending to form part of a loop, a detachable loop portion having two ends that fit together with said extending portions of said swivel member to form a closed loop, a rod member extending through holes in said extending portions and detachable loop portion to join said extending portions of the swivel with said detachable loop portion, and a fastening means for securing the position of said rod with respect to the extending portions and the detachable loop portion.

Abstract: A tightener for securing tire chains about industrial tires. The tightener includes a pair of block members that are threadably engaged by a draw bolt. The draw bolt includes a tool engaging surface that facilitates attachment of a tool to turn the draw bolt about its central axis and correspondingly move the block members axially toward or away from one another. A pair of non-extensible lengths of chain are connected to each block and extend outwardly to free ends that are adapted for connection to the side rail chain of an industrial tire chain. Therefore, the tightener may be mounted with the length of chain connected to the side rail chain and the blocks and draw bolt substantially centered on the tire axis. The draw bolt may then be rotated to bring the block members axially together, pulling inwardly on the side rail chains to tighten the tire chain about the tire periphery.

Abstract: A tether line is connected between a surfboard and an ankle cuff about a surfer's ankle so that the surfer will not lose the surfboard if he becomes separated from the board. A quick release is provided between the one end of the tether line and the ankle cuff permitting the surfer to manually release the tether line from the ankle cuff in an emergency situation. The quick release includes a yoke member to which the tether line is secured arranged to straddle an opening in the ankle cuff. A pin passes through the arms of the fork and the opening in the cuff and by simply manually removing the pin, the quick release results.

Abstract: A locking system for locking a nut on a threaded shaft comprises a transverse through aperture in the shaft alignable with through apertures in the nut, and a pin extending between the aligned through apertures to lock the nut against rotation relative to the shaft. According to the present invention displaceable wedge means are located in a recess of the shaft and engage the pin to lock the pin against axial displacement. These wedge means preferably comprise a plastics plug with a waisted through aperture, the pin including a complementary necked portion. The locking system can be advantageously used with the nut and bolt of a shackle.

Abstract: This shackle consists primarily of a pair of "U"-shaped members, a leg of each threading into each other, so as to form a pivotal joint, which enables the shackle to be easily applied to a chain, even under adverse conditions. The shackle further includes a tapered clincher head pin, and the opening in a mating clincher head is tapered at the bottom and countersunk at the top, so as to allow swedging of the pin therein.

Abstract: A mounting device for kiln hardware comprises two standards connected to the kiln wall and projecting inwardly through the refractory. One standard is connectable to the hardware through a removable pin. The hardware and the other standard are provided with cooperating means which prevent rotation of the hardware about the pin when the pin is installed. The members are designed so that removal of the pin allows removal and replacement of the hardware.

Abstract: A chain net with at least one nodal point formed by a horizontally arranged chain lock and at least three vertical links connected to each other by a C-shaped basic body of the chain lock, which is closed by a locking element, at least one end of which forms a stop for a horizontal link, the basic body being provided with further stops preventing the vertical links from moving into the area of the locking element.

Abstract: A shackle for chains, especially sling chains, which includes a shackle stirrup and a shackle bolt. In closed position of the shackle. The shackle bolt is located in aligned bores provided in the legs of the shackle stirrup and is held in the said stirrup by means of at least one securing member. At least one end section of the bolt extends between the legs of the shackle and has a cross section which is smaller than the cross section of the bores in the legs of the shackle stirrup.

Abstract: A coupling shackle for field/factory assembly of lengths of chain, rope, cables, or the like/or attachments thereto; said coupling shackle comprising a generally U-shaped unit comprising an overlay/underlay assembly of two or more relatively nested complemental-configured U-shaped members which are traversed and interconnected at their leg ends as by means of a bolt or pin or the like. Said members may be first stamped or otherwise cut out of sheet/plate stock and then bent into U-shaped configurations; the bowed intermediate portions thereof being subsequently U-shape sectionally formed. The open end leg portions at opposite sides of the unit are apertured and side-by-side mounted upon the structurally cooperating interconnecting bolt or pin.

Abstract: A chain particularly useful for draglines in various type strip mining operations is disclosed. The chain is made up of individual, separately assembled links of generally a U-shape having spaced pin lugs at one end. The lugs have aligned pin eyes for holding a pin between them, which is received generally flush with the outside surfaces of the lugs. To prevent pin rotation and to prevent oblong wear in the pin eyes, the pin and the eyes have a flat surface on the side toward the open end of the U-shaped link. With the pin installed in the eyes, a roll pin is press fit through one lug and through that end of the pin to retain the link pin in place. Openings in the lug are oblong shaped, so that some forward and backward movement of the link pin is permitted and the roll pin is never put in a shear situation. The link units are assembled at 90.degree. to one another, with a pin of one link passing through the next link.

Abstract: A pin or bolt slidingly supportable in rings at opposite ends, or throughout its body in a sleeve, such as through the eyes of a clevis, is usefully locked against axial displacement by a radially sliding spring-biased detent which fits into a groove of a supporting ring or sleeve, securing it against axial displacement. The supporting ring has a slot extending inward from a support surface and sized to receive a key, such as a disc or a coin, which may be inserted in the slot to engage and depress the detent against its biasing spring, sufficient to displace it from the groove of the ring and thus unlocking and allowing the pin to be displaced in its support by sliding therefrom axially. In a modified form, where the supporting rings of a clevis are dimensioned so small that the radially cut slot would tend to weaken them, the ends of the pin may be secured by extra annular rings or washers mounted adjacent to the main supporting rings of the clevis.

Abstract: A chain shackle has a pin thereon for mounting the shackle on a hanger. The pin extends across the ears of the shackle and is permanently connected thereby by flaring a pair of fingers at one end of the pin into enlarged pockets formed in the bore of the ear through which the pin passes.

Abstract: A shackling device includes a U-shaped member and a pin. The ends of the U-shaped member are provided respectively with a threaded aperture and an unthreaded aperture. One end of the pin is provided with threads which are to be mated with the threads within the threaded aperture. The unthreaded aperture has a diameter which is larger than that of the portion of the pin which is not provided with threads. At least a portion of the unthreaded aperture is of smaller diameter than the diameter of the threaded portion of the pin. An eye is provided on that end of the pin which is not provided with threads.

Abstract: A clevis shackle having a locking pin spring-loaded to span and normally close the shackle area of the clevis.

Abstract: A heavy duty shackle for use under great loads, such as in anchor lines. The shackle is formed from a cylindrical bar rod by shaping the ends to a reduced diameter, and forging the central portion into a flattened shape having the cross-section of a wide shallow U shape. The bottom surface of the central section is in the form of a portion of a circular cylinder. The ends of the bar are flattened and a central opening is forged and based for a pin. The formed bar is then bent in the form of a bow to provide an eye for the shackle, with two parallel ears spaced a selected distance apart.

Abstract: An attachment device for the quick and easy attachment of a counterbalance coil spring to an appropriate bracket features a single section of rod bent to provide a shoulder at one end for connection to the bracket and a second shoulder at the other end for the counterbalance spring, the ends being equipped in a manner to permit application of an interlocking retention piece over end sections of the bend rod. In some forms of the invention fasteners applicable to the very endmost part of the rod are employed to lock the retention piece in place.

Abstract: The invention disclosed is a safety lock for a removable shaft which has special utility when disposed on a clevis or like device. The lockable shaft is disposed by means which readily permit free lateral movement while preventing accidental disengagement under load bearing conditions when in the locked position. In an embodiment, shaft removal from a cooperating support member is prevented by a shaft restrictive means. Thus, complete removal of the shaft from support members during load transfer is avoided.

Abstract: A heavy duty shackle for use under great loads, such as in anchor lines. The shackle is formed from a cylindrical bar rod by shaping the ends to a reduced diameter, and forging the central portion into a flattened shape having the cross-section of a wide shallow U shape. The bottom surface of the central section is in the form of a portion of a circular cylinder. The ends of the bar are flattened and a central opening is forged and based for a pin. The formed bar is then bent in the form of a bow to provide an eye for the shackle, with two parallel ears spaced a selected distance apart.