63results about "Chain fastenings" patented technology

An underwater chain stopper and fairlead apparatus for offshore structures, drilling platforms, ships or other vessels. The apparatus comprises a mounting member, a fairlead member and a chain stopper member. The mounting member is attached to an underwater surface of the offshore structure or vessel and includes a bracket for coupling the fairlead member. The bracket may comprise a hinge allowing the fairlead member to pivot in an approximately horizontal plane. The chain stopper member is coupled to the fairlead member through a hinge which allows the chain stopper member to pivot with respect to the fairlead member in an approximately vertical plane. The chain stopper member includes a chain stopper flapper having a horseshoe shaped opening at one end. The other end of the flapper is connected to the chain stopper member through a hinge which allows the flapper to swing between an open position and a closed position. In the open position, the chain links for the anchor chain are allowed to pass by the horseshoe shaped opening on the flapper. The horseshoe shaped opening also includes a chain link seat which stops movement of the anchor chain through the chain stopper member when the flapper is in the closed position. The chain stopper flapper moves to the closed position under the force of gravity to provide a self-locking chain stopper. A latch mechanism is provided for latching the chain stopper flapper in an open position.

The present invention relates to a lifting hook (1) that can be used to lift loads using lifting gear, comprising a hook-shaped part (3) which hooks onto the load that is to be lifted and a chain length reducer (5) secured to the hook, the said reducer (5) comprising, on the one hand, an orifice (17) the dimensions of which allow the links of the chain (7) to pass through and then allow one (13) of the said links to be locked in position when the said chain (3) is taut and, on the other hand, means (21) for partially closing off the orifice (17) which are hinged so that they can be released manually simply by pressing them so as to allow the length of the chain (7) to be adjusted, notable in that the reducer (5) comprises a closure finger (10) that closes off the hook-shaped part (3) to prevent the load from becoming unhooked, and in that the closing-off means (21) comprise self-locking means (24) which hold the closure finger (10) in the locked position on the part (3) of the hook as long as the closing-off means (21) are disengaged from the orifice (17) and have not yet been returned to a position in which they bear against the external face (23).

A coupling link for connecting two parts together includes link components (which each form a partial link) that are joined together with a removable support. The support and link components are coupled together to withstand high loads and/or adverse wear conditions. The inventive construction is strong, durable, efficient, cost effective and easy to use. Wear caps are provided to facilitate extended usable chain life.

A coupling element of a shackle for load-carrying elements, such as chains, hooks, or the like, is disclosed. The coupling element has two substantially parallel legs, whose free ends each have a bore for the accommodation of a connecting bolt, by means of which the coupling element can be linked to another coupling element of the same design to form the shackle, the coupling elements being held together only by the connecting bolt, which bores extend in the same direction relatively to each other, wherein the bores are out-of-line and extend at an angle to a longitudinal center line of the coupling element.

The invention relates to a plane chain strand (50) provided with horizontal and vertical normal chain links (30, 40) which are mounted in an alternating manner and which engage into each other in a nondetachable manner with the limbs and arcs thereof. In the chain strand (50), directly in front and directly behind a chain lock link (10), at least one special chain link (20) is mounted in the same position as said chain locking link (10). The limbs of the lock links have the same outer contour, especially the same width and thickness, as the outer limbs of the two lock parts of the chain lock link (10). The wear and tear of the chain lock link (10) of said inventive plane chain strand (50) can be reduced or eliminated in comparison with conventional plane chains, by means of equal or slightly larger previous and subsequent special chain links (20).

Chain link (1) comprising two side limbs (3,4) at both ends joint by curved end portions (5,6). The chain Link comprises at least one endless band (7) of fiber material wound along the perimeter of the chain link. The fiber material follows the longitudinal direction of the limbs and the curvature of the end-portions. In a chain made of interlocking chain links of this type, all tensile loads are absorbed by the fiber material, whereas the bearing load due to interlink contact, plus the link shear and bonding stresses near the contact points are absorbed by the end portions.

A method of forming a chain having a plurality of links that are formed from separate link members is provided that includes press fitting one link member into another link member. The method may further comprise cooling or heating one link member before completing the pressing operation.

The block lock for round link chains includes two approximately L-shaped lock halves connected with each other by pins. Each lock half has a longitudinal leg with a center rib, which faces away from its continuous back portion and separates bearing shells for chain links, and a cross leg arranged on one end of the longitudinal leg. Projections and receiving pockets are provided on the front ends of the longitudinal legs facing away from the cross legs, and receiving pockets and projections matching the projections and receiving pockets on the longitudinal legs are provided on the sides of the cross legs facing the center ribs. The center ribs are mutually offset in the longitudinal direction of the identically constructed lock halves.

The invention discloses an anti-fatigue eccentric sleeve chain. The anti-fatigue eccentric sleeve chain comprises an inner link and an outer link which are embedded to form a chain in an internal-and-external staggered manner, the inner link comprises a sleeve and an inner chain plate, and the sleeve is in interference fit with the inner chain plate; the outer link comprises a pin shaft and an outer chain plate, the pin shaft is in interference fit with the outer chain plate, and the pin shaft is inserted into the sleeve; the inner chain plate comprises an inner chain plate hole and an inner chain plate outer edge arc, the circle center of the inner chain plate hole and the circle center of the inner chain plate outer edge arc offset by 0.10 mm to 0.40 mm; and the outer chain plate comprises an outer chain plate hole and an outer chain plate outer edge arc, and the circle center of the outer chain plate hole and the circle center of the outer chain plate outer edge arc offset by 0.10 mm to 0.40 mm. The anti-fatigue eccentric sleeve chain is provided. By means of the chain, eccentric design is adopted, and the anti-fatigue eccentric sleeve chain has the beneficial effects of being compact in structure, high in torque, high in static strength, high in fatigue strength and long in service life.

The invention discloses a chain shaft of a chain saw. The chain shaft of the chain saw comprises two ends and a peripheral surface around a central axis of the chain shaft, and is characterized in that the each end comprises the peripheral surface with a certain curvature. The chain shaft provided by the invention can ensure that the stress is uniformly distributed on the head of the chain shaft subjected to a cold heading process and the stress is uniformly distributed on the surface of a riveting wheel of a riveting machine in the process of spin riveting, so that the probability of damaging the chain shaft is reduced and the production cost is effectively lowered.

The apparatus is intended for vertically linking a first chain and a second chain under water. The apparatus is characterised in that it comprises a lower base (1) with an open cross-shaped slot (5) into which the last link of the first chain (6) is inserted, extending above said lower base (1), while a guide/holder (2) for the second chain (7) is attached to the lower base (I) over said slot, said guide/holder containing an H-shaped shackle (II) that is coupled to the last link of said second chain (7) by means of a first bolt (12), the last link of the first chain (6) being inserted in the free space in the shackle (11) so that both chains (6-7) are coupled by means of a second bolt (13).

This invention relates to a connector, particularly to a shackle suitable for use in connecting two links of a chain or a chain to an anchor, more particularly to a connector comprising a first portion and a second portion, at least one first connector arm on the first portion and at least one second connector arm on the second portion, wherein both the first and second connector arms have multiple bearing surfaces, preferably six, and are able to engage one another when the connector is coupled by means of the bearing surfaces. The connector of the present invention has the advantage of having a break load of 1.3[0.0274 d²(44−0.08 d) kN, wherein d is the nominal diameter, and preferably a thickness of 1.3 d.

The present invention relates to a lifting fastener comprising: a body through which a mounting hole is formed; a lifting ring which is connected to the body such that a hook of a crane or a rope is latched; and a coupling nut which is provided inside the lifting ring and, if an object to be lifted has a bolt, is coupled to the bolt. According to the present invention, in addition to the basic function of a transformation preventing portion which supports the structure of the lifting ring so as to increase the tensile strength of the lifting ring, considering that the tensile force increases due to the force of lifting the lifting ring and the weight of the object to be lifted during the lifting, the lifting ring can be prevented from transforming due to the pull toward the coupling nut and a space for the rotation of the coupling nut can be acquired. Moreover, if a coupling hole is provided on the object to be lifted, the object to be lifted is coupled by means of a coupling nut mounted on the lifting fastener. And if a bolt is provided on the object to be lifted, the object to be lifted is coupled by means of the coupling nut while the coupling bolt is separated from the liftingfastener. And if the coupling bolt mounted on the lifting fastener or the bolt provided on the object to be lifted is long, the interfering transformation preventing portion is omitted for effective use.

In a chain joint (1) for link chains, having a main body (2) in the form of an oval chain link with two mutually parallel longitudinal legs (3, 4) which are connected to one another at their ends in each case via a rounded link portion (5, 6) and one of which has an interruption for forming a receiving opening (7) for the hooking-in of oval chain links into an internal opening (8) of the main body (2), said receiving opening being bounded at its ends by in each case one longitudinal leg section (4A, 4B), wherein, in said longitudinal leg (4), there is provided a threaded bore (9) which runs in the longitudinal direction of said longitudinal leg and which extends in both longitudinal leg sections (4A, 4B) and into which there can be screwed a closure screw (10) which, in the screwed-in state, engages with the threaded bore (9) in both longitudinal leg sections (4A, 4B), it is provided that, while maintaining the predefined sizes for outer circumference (A) and link width (B) of the main body (2), said main body is provided, in the region of its longitudinal legs (3, 4), with a profile cross section (Q1) that is larger than the profile cross section (Q2) in the region of its rounded link portions (5, 6).