Abstract: The invention relates to a device and a method for producing at least partially closed hollow profiles from a sheet by a U-O-forming with a tool set having a U-punch in a first tool half for producing an at least partially U-shaped sheet and an upper die in a second tool half for forming an at least partially U-shaped sheet into an at least partially closed hollow profile. Parts of the tool set run parallel to one another in the axial direction of the at least partially closed hollow profile to be produced and are arranged above one another in the closing direction of the tool halves, wherein a common matrix receiver is provided between the tool halves of the tool set, which receiver comprises at least two identical, partially U-shaped dies for the tool set and can rotate about its axial axis.

Abstract: A method for producing welded round and profile chains of chain links that are connected to each other. The chain links for round and profile chains produced by this method include two chain link partial pieces that are connected to each other by friction welding.

Abstract: Apparatus is disclosed for forming a single wire link which can be joined to a preformed jewelry article. The apparatus includes an electric motor-driven cam assembly that provides for sequential operation of the wire feeding and link forming devices. A single wire section is severed from a wire stock, bent into a U-shaped configuration and fed to a link forming station within a common working plane where the U-shaped wire element can be formed into a link and joined to a jewelry article. The link forming apparatus avoids the use of a magazine for storing a plurality of U-shaped wire element thus eliminating unused U-shaped wire elements in the magazine when switching wire stock. The apparatus is constructed in a manner which readily permits quick and easy changing of the feeding and forming dies when switching to different size wire stock. The apparatus further provides a simple adjustment mechanism for adjusting the length of the wire section severed from the wire stock.

Abstract: A machine is shown for feeding a length of wire to a forming station, cutting and forming the length into a U-shaped element around an arbor, moving the U-shaped element to a presentation position in a channel of a face plate with the free ends of the element extending out of the face plate, then forming the free ends into a closed loop by means of a forming head engaging the ends and bending them into the loop and finally ejecting the element from the face plate.

Abstract: A machine for the production of an ornamental chain of the type formed by so-called "figure-of-eight" links, comprising a slide (23) for transferring a section of wire of prefixed length, folded in a U shape, from a unit (51) for supplying said section of wire to a calibrated tubular guide (34), holding the already formed chain, to engage it with the last formed link of the chain. The guide (34) is radially surrounded by tools for bringing together (55,56) and permanently joining (71,72) the ends of the arms of said U-shaped section engaged in the last U-shaped link, and tools for centring (73) the resulting closed link with respect to the axis of the guide (34).A push device (81) is further provided for performing an alternating movement away from and towards the last formed U-shaped link along the axis of the guide (34) so as to supply a force onto said link, causing at the same time sliding of the chain inside the guide and folding the closed link about its middle transverse axis.

Abstract: The disclosure relates to the art field of machines for crafting jewelry, namely, chains both in precious metal and in costume jewelry metals. The apparatus of the present invention includes an indexing mechanism for feeding at least one wire, a cutter for severance of the wire into discrete lengths, a horizontal link former that can move transversely relative to the direction the wire is being fed, and a vertical pincer the grips of which are designed to loop the longitudinal member around the entire cross-sectional periphery of the link former in such a way that the ends of a length of wire, formed into a link exceed the peripheral length of the link thus manipulated. The pincer moves through a path parallel to the link former and into a position where soldering means are located that fuse together the end stretched portions of excess length of the link into a bead, thereby embellishing the finished link.

Abstract: A prickle chain wherein each link has two side portions which are joined at one end by a curved bridge portion, the side portions terminating in respective outwardly projecting ends which cross each other and extend in opposite directions, the projections being the "prickles" of the chain. Each link is formed by engaging opposite ends of a straight rod in respective brackets which are pivoted by hydraulic piston/cylinder assemblies firstly to form the rod to a "U" shape, and then cause the ends to cross each other and project outwardly in opposite directions.

Abstract: A straight wire length is bent against a mandrel into an obtuse V-shape and then into a C-shape at a first station, and against another mandrel into an oval shape at a second station. When making the V-shape bend the leading edge of the wire length is thereby contained against perpendicular movement. The wire length is then bent into a C-shape and when it is moved from the first station to the second station the stop is pivoted against the force of the spring by a bar transforming the V-shape to the C-shape. When the emerging C-shaped link clears the support surface of the stop element, the spring returns the stop element to its initial position in the first bending station, against a stop. The surface of the stop element contacting the stop may serve as an electrical contact for process control.

Abstract: The chain links are bent in a single bending station, using a single mandrel. Pieces of wire of a given uniform length are bent into a V-shape between a holder and a suitably shaped recess in the mandrel. A wire feed sleeve and a wire receiving sleeve are disposed opposite one another defining a wire path between the holder and mandrel. Wire guides having guide surfaces guide the wire in its feed path from the feed sleeve to the receiving sleeve. The receiving sleeve has an abutment member provided with a support surface which, with the feed sleeve, prevents the leading and trailing ends of the wire piece from moving in a direction perpendicular to the direction of wire feed during the V shape bend. The two sleeves, each of which is formed together with a bending tool, are then retracted to free the wire ends, and the bending tools are moved perpendicular to the wire feed direction to bend the wire ends around the mandrel into a C-shape.

Abstract: A method for forming a garland chain is disclosed, wherein an original chain formed of either long links or of long and short links is worked to produce a garland chain. The garland chain is formed by sliding one link on another so that two attached links are positioned at one end of a long link, and deforming the long link to constrict the central or medial portion, thereby retaining the two attached links at the same end of the long link. Deformation may be applied in the form of crimping, bending or twisting of the links, or combinations of these methods. The deforming methods can be applied to every long link in a chain, or to selected sequences of long links, to create different garland chain effect.

Abstract: A chain link belt includes a plurality of tube pairs, each pair comprising two tubes joined along their sides in a substantially parallel relation. A plurality of wires of predetermined lengths are used to join the tubes to form the belt links. The wires are formed in a quadrilateral with the tubes on opposite sides thereof and with the joined ends of the wire links positioned within one of the tubes hidden from view. One of the wires is engaged through one tube of the adjacent tube pairs and another wire is engaged through the other tube pairs for connection of other tube pairs to form the chain link belt.

Abstract: An apparatus is disclosed for the feeding of oval-shaped open end wire links seriatim, from an open-link feeding bar magazine, to a groove in a movable link-forming slide tool. Subsequent upward movement of the link-forming slide tool carries the open oval-shaped wire link into internal surface contact with a fixed position link center-forming anvil. Closed chain links or findings are mounted over the ends of the open wire links at this point, and further upward movement of the link-forming slide tool results in the closure of the previously open wire link to a desired configuration such as oval or round, and its assembly with the preformed ornamental objects is completed. The present device may be employed in various power driven modes.

Abstract: A method of making a shackle is disclosed. Both ends of a round bar are upset and are then formed into circular heads which are bored through. The round bar is later bent into a U at its middle part to form the shackle body, and the indicating letters are bulged out on the shackle body and surrounded by a depressed island.

Abstract: An apparatus for producing ornamental link chains (Venetian chains). In accordance with the invention the cutting to length is followed by a conveying step transversely to a feed direction, both conveying steps are carried out transversely to a direction of action during the cutting to length, preliminary and finish bending (closing), the section of flat wire is held down for the preliminary bending and for the closing, the particular closed individual link is pushed into the extraction section to adjust the first transverse web in the assembly plane, and the striking is superimposed on the extraction of the chain.

Abstract: Part of a red-hot metal rod between the ends of the rod is supported and first and second bending members are displaced, preferably simultaneously, to bend parts of the rod on both sides of said part around respective forming surfaces to produce two U-bends substantially without movement of said part. Then the two end portions of the rod point in substantially opposite directions and overlap without touching one another. Preferably the rod bent in this way, still red-hot, proceeds to another location where it is bent further to produce a railway rail-fastening clip of the desired final shape.

Abstract: A method and a device for bending a rod-shaped link blank into a substantially closed chain link, particularly while at the same time hooking the link blank into a chain end. According to the invention, the blank is brought into a first receiving position with one of its end portions located between, on the one hand, two rotatable abutment rollers disposed at a distance from each other and, on the other hand, a bending tool movable back and forth transversely between said abutment rollers. The bending tool is then brought to a position between the two rollers so as to bend said one end portion of the link blank.

Abstract: Chain links are formed of wire pins by bending each wire pin about work faces of a mandrel with bending tools which engage the pin at the two end zones thereof. The locations of engagement describe, at least during the terminal phase of the bending operation, a circular involute, the reference point of which coincides with the center of curvature of the respective work face of the mandrel.

Abstract: Chain links are formed of wire pins by bending each wire pin about work faces of a mandrel with bending tools which engage the pin at the two end zones thereof. The locations of engagement describe, at least during the terminal phase of the bending operation, a circular involute, the reference point of which coincides with the center of curvature of the respective work face of the mandrel.

Abstract: An automated system for producing chain wherein individual pins are fed one-at-a-time to a heating station. The pins are heated in stages at said station to a temperature suitable for bending of the pins. The pins are automatically moved from said station by transfer and conveyor means to a bender where the pins are clamped in place and then bent in stages into an open-ended link shape. A robot picks up the link-shaped pins and places the pins one-at-a-time on the supporting surface of a closer. The robot then interlinks a welded link with a pin on the closer, and the pin on th closer is then closed. The robot then moves the closed pin to the welder for welding of the ends.

Abstract: A method for producing a link chain in which some of the links have deformation characteristics differing from other links, and apparatus for producing the link chain in which stock material having the different deformation characteristics are sequentially fed to a link-forming means from flanking magazines. In a modified form means are provided for severing stock lengths from a continuous wire on either side of the link-forming means.