US3822548A - Method and apparatus of manufacturing c-shaped links - Google Patents

Method and apparatus of manufacturing c-shaped links Download PDF

Info

Publication number
US3822548A
US3822548A US00159425A US15942571A US3822548A US 3822548 A US3822548 A US 3822548A US 00159425 A US00159425 A US 00159425A US 15942571 A US15942571 A US 15942571A US 3822548 A US3822548 A US 3822548A
Authority
US
United States
Prior art keywords
wire
bending
section
bent
bending device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00159425A
Other languages
English (en)
Inventor
P Esser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meyer Roth and Pastor Maschinenfabrik GmbH
Original Assignee
Meyer Roth and Pastor Maschinenfabrik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Meyer Roth and Pastor Maschinenfabrik GmbH filed Critical Meyer Roth and Pastor Maschinenfabrik GmbH
Application granted granted Critical
Publication of US3822548A publication Critical patent/US3822548A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21L—MAKING METAL CHAINS
    • B21L3/00—Making chains or chain links by bending the chain links or link parts and subsequently welding or soldering the abutting ends

Definitions

  • the pre-bent cut wire sections can be directly fed from the pre-bending device into the bending de- [56] Refere es Cit d vice, or alternatively, fed into a magazine which in UNITED STATES PATENTS turn successively feeds the pre-bent cut wire sections 1,244,448 10/1917 Berg 59/23 Into the bendmg devlce' 1,360,021 11/1920 Rehfuss 59/27 6 Claims, 4 Drawing Figures 7.6 'u 2 i ⁇ 18 [M "L1 2 asw/ 12/ d "3 III/IllI/l/l/l/l 1 BACKGROUND OF THE INVENTION
  • This instant invention relates to a method and apparatus for manufacturing wire into C-shaped chain links.
  • the prior art embodiment has a number of disadvantages which are realized especially in the case of short chain links, i.e., wire which is cut to a length down to 2.5 times its diameter, and especially when the wire is hard steel-Especially in these cases, as well as in others,
  • the longitudinal center section of the wire sections which forms the back of the completely bent chain link must be bent inversely to the bending process so that after the complete bending of the chain link, and especially after the forging and the welding-together of the open ends of the links, the longitudinal center section is generally in a straight line and does not show any convexity.
  • the wire is passed through the cutter-box, cut off by the cutter, and is gripped at its center during the cutting phase by a holding device and pushed against a mandrel which is slightly bent in a bean-shape at that point which complies with the back of the link and is located opposite the holding device, in order to obtain the reverse bending of the pin at this point.
  • a further disadvantage in the prior art device consists in that it is impossible in the common cutting method to provide the wire section with two completely even end areas which are in parallel to each other. This is a basic requirement of the cutting process. If the position of the wire section, during its movement from the cutting position into the bending position, is not accurate, then the end sections, which are to be welded together into the various links of a chain, will be facing each other inaccurately. This will cause an uneven welding, which negatively'affects the quality and stability of the weld-points and thereby affects the link itself.
  • a third disadvantage is represented by the fact that at least longitudinal displacements of the wire section during its movement from the cutting into the bending position are prevented, as mentioned above, in that the wire section which may not yet, or not completely, be cut off, is pressed onto the mandrel by the holding device. This causes the holding device to slide on one side of the wire section and thereby mark the center area of the wire section. Furthermore, there may be additional bending during the cutting process on the end of the wire which is being held in the cutter-box, while finally the two ends of the wire section obtain uneven shapes.
  • the instant invention has as its objects: to provide a pre-bending device, which comprises a holding tool and a mandrel; to provide means so that the wire section during its transition from the cutting into the bending position is in a registered position; and the cutting process is handled in such a way that it will not be interrupted by the shifting of the wire section into the bending position.
  • the instant invention thus consists in the separation of one working step into two working steps, which may, at first glance, give the impression of a retrogressive process.
  • the instant invention not only solves the three above-described objects and provides for the respective advantages of now enabling the pre-bending process for producing the reverse bending by means of a single work-tool, but it provides for a second advantage by eliminating the need for placing the pre-bending device at the final stage of the working path from the cutting into the bending position of the wire section. This last phase, especially in an acceptable working cycle, is so shortthat the mechanically difficult bending of the wire section must be made within the shortest possible time.
  • the entire working cycle is available for the prebending step and, under special conditions, one does not need to depend on the working; cycle of the bending device, but rather the pre-bending and cutting are separately performed and the pre-bent wire sections are placed in magazines which are attached to the bending device.
  • the fact that the wire sections are pre-bent allows the identical registration of the pre-bent wire sections with the mandrel in the bending device.
  • This method may be utilized in various ways. Thus, it is firstly possible to pre-bend the continuously fed wire at its end and then to cut off the wire section, or secondly, this process can be reversed, i.e., first completely cut off the wire section from the continuously fed wire and then proceed with the pre-bending.
  • the cutting is not made with the use of cutters or scissors but, for example, by means of a separator-blade, etc., or to take care in some way that the relative position of the wire does not change.
  • a separatorblade it is, for instance, easily possible to provide this blade with a V-notch profile and to produce thereby a wire section so that after the final bending of the chain links, the end areas facing each other are exactly parallel and are practically completely even. This type of process is also possible in a case where the wire section is first pre-bent and then cut off.
  • An apparatus for accomplishing the inventive process combines'a pre-bending device which is provided with a hole in the center of its length for receiving a die pinch, having a grooved bottom commensurate with the desired pre-bent curvature, and finally, an elongated, in cross-section, bore-hole through which the wire is fed whereby the elongated or oval cross-section of the bore-hole leaves space for the pre-bent wire.
  • the continuously fed wire is accordingly guided into the pre-bending device with the oval cross-section borehole, and then is shaped by a die punch to the respective shape of the grooved bottom of the pre-bending device and is then, due to the oval cross-section of the bore-hole prevented from twisting.
  • the ejection-end of the prebending device be constructed to co-operate with a cutter-blade for cutting off the wire sections after they exit.
  • the inventive device which in the direction of the movement of the wire section is accordingly not as deeply constructed, be designed in the above-described form, whereby, however, bending-devices are connected to the cutter and generally arranged on the same sliding carriage along with a separate holding device, and all these parts should be adpated in their positioning to the form of the wire section.
  • the holding device may now be of a construction which is substantially lighter in weight, since it no longer serves to deform but only for the purpose of securely holding the pre-bent wire section against the mandrel.
  • those parts which move the wire section forward during the cutting phase must be constructed in a way so that they are adjustable to each other.
  • the pre-bending device is constructed as a separate apparatus or in a separate working area by itself, only a magazine will be needed foraccepting the pre-bent wire sections, which should be arranged in the feed direction of the cutter in addition to a feeder device to be arranged on the link-bending apparatus into which the magazines are insertable.
  • FIG. 1 is a schematic illustration with a sectional prebending device whereby the pre-bending is made on the continuously fed wire, and the pre-bending device forms a part of a link-forming apparatus;
  • FIG. 2 shows a partial view towards the left front area of the pre-bending device according to FIG. 1;
  • FIG. 3 illustrates another embodiment of a linkforming apparatus including a magazine-supplyingdevice
  • I FIG. 4 is an elevational view of a further embodiment of the link-forming apparatus.
  • a mandrel 5 of known construction having a clearance 6 to accommodate the completed bending (not shown) of the chain link, and also having a reverse curve 7 on its top surface on which is placed a pre-bent link 8 which has just been completed.
  • the broken line represents a wire section 9 which has been pre-bent according to the instant invention and is secured by means of a holding device 10.
  • the holding device carries at its remote end a roller 11 which is moved by a main shaft 12 via a cam plate 13.
  • the holding device 10 is mounted in a sliding carriage 14 which sliding carriage is reciprocated by means of a roller 15 and another cam plate 16.
  • a cutter 17 as well as two bending arms 18 are removably attached to the sliding carriage 14.
  • the cutter has a lower end 35 and a groove 35a commensurate to the shape of the pre-bent wire.
  • Two' additional final-action bending arms 19 are utilized and work in conjunction with bending arms 18. The driving mechanism of final bending arms 19 has not been shown.
  • a pre-bending device 20 which is provided with an oval bore-hole 21 as seen especially in FIG. 2 for feeding a continuously moving wire 22.
  • die punch sliding carriage 23 is moved by a roller 24 by means of a cam plate 25 mounted on main shaft 12 in the same manner as the holding device and the slidecarriage 14.
  • the supporting means and guiding surfaces of thetwo sliding carriages l4 and 23 are not shown.
  • a die punch 26 is removably attached to the die punch sliding carriage 23 and has a contact 27 which is commensurate with the shape of a bottom 28 of a hole 29 in the pre-bending device 20. As shown, the die punch 26 contacts the wire 22 by moving through the hole 29 in the pre-bending device and thereby imparts the pre-bend to the wire.
  • the arrangement is such that the cutter l7 and the bending devices 18 follow the holding device 10 so that the prebent wire, during the feeding of the wire out of the prebending device, first reaches the required position and is thereafter pressed against the mandrel 5 by means of the holding device 10. Only after the wire is firmly clamped does the function of the cutter l7, immediately followed by the bending function of the bending arms 18, come into play.
  • the arrangement as described above may be replaced by a special construction of the cutter l7, bending arms 18 and the holding device 10, whereby the contact surface of the holding device may be enlarged sideways up to the bending devices in order to avoid the twisting of the wire.
  • the pre-bending device and die punch in contrast to the mandrel, may be moved back before the wire ends are bent up against the mandrel by bending arms 19, whereby in this case it is recommended that light holding springs etc. be provided on the holding tool which secures the wire during and after the cutting phase.
  • FIG. 3 a simplified bending apparatus in accordance with FIG. 1 and the present state of the art is proposed, in which the sliding carriage 14 is only provided with the bending devices 18 and is therefore of a generally symmetric design.
  • the wire is, in this case, prepared in a separate functioning pre-bending and cutting device as shown in FIG. 4, and is placed into a magazine 30.
  • F IG. 3 shows the magazine 30 filled with cut wires, and the magazine consists of a box container having a bottom 31, front and rear walls 32 as well as side walls 33.
  • the magazine 30 can be positioned where the die punch sliding carriage 23 was positioned in FIG. 1.
  • An ejector 34 pushes the cut wires 9 successively from the magazine 30 in the direction of the arrow and into the desired position, as indicated by the dotted line, opposite the mandrel 5.
  • the separate functioning pre-bending and cutting device is of the type illustrated in FIG. 1, although the components 5 to l0, l8 and 19 illustrated in such Figure are not employed in FIG. 4, as will be entirely clear to a person skilled in the art.
  • a link forming apparatus for forming C shaped wire links comprising a bending device including a mandrel over which a cut wire section is shaped, a holding device for holding the wire section against the mandrel, and bending arms to bend the wire section about the mandrel, the improvements including a prebending device in advance of said bending device, the pre-bending device serving to impart a reversed curve to that section of the wire which will be opposite the two ends of the link after the link is bent into a C shape, said pre-bending device including a die-punch and actuating means therefor to form the reverse curve.
  • a link-forming apparatus for forming C-shaped wire links comprising a pre-bending device to impart a reverse curve to that section of the wire which will be opposite the two ends of the links: after the link is bent into a C shape and including a die punch and actuating means therefor to form the reverse curve, and a separate bending device including a mandrel over which a pre-bent cut wire section is shaped, a holding device to hold the wire section against the mandrel, and bending arms to bend the wire section about the mandrel, wherein said pre-bending device further includes a block portion having a bore therethrough and a hole at substantially right angles to said bore for receiving said die punch, the area of said bore opposite the hole having a concave contour which. defines the reverse curve of the prebend, and the bore from said concave contour to its end in the direction of wire feed having an oval cross-section to allow the pre-bent wire to pass and to guide the wire.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US00159425A 1970-07-02 1971-07-02 Method and apparatus of manufacturing c-shaped links Expired - Lifetime US3822548A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702032692 DE2032692A1 (de) 1970-07-02 1970-07-02 Verfahren und Vorrichtung zum Herstellen von Drahtpinnen, zur Herstellung von C-förmigen Kettengliedern

Publications (1)

Publication Number Publication Date
US3822548A true US3822548A (en) 1974-07-09

Family

ID=5775534

Family Applications (1)

Application Number Title Priority Date Filing Date
US00159425A Expired - Lifetime US3822548A (en) 1970-07-02 1971-07-02 Method and apparatus of manufacturing c-shaped links

Country Status (6)

Country Link
US (1) US3822548A (enExample)
CH (1) CH533473A (enExample)
DE (1) DE2032692A1 (enExample)
FR (1) FR2098114A5 (enExample)
GB (1) GB1347579A (enExample)
SE (1) SE377059B (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104707932A (zh) * 2013-12-17 2015-06-17 上海埃鲁秘工业炉制造有限公司 一种新型的环链送料方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2177673A1 (en) * 1972-07-13 1973-11-09 Meyer Roth Pastor Maschf Chain link bender - bending load on the bending mandrel is reduced to avoid breaking it
CH593433A5 (enExample) * 1973-08-28 1977-11-30 Meyer Roth Pastor Maschf
CN110842132B (zh) * 2019-11-21 2021-03-19 安徽亚太锚链制造有限公司 一种可控长度的锚链环自动化制造设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1244448A (en) * 1916-05-08 1917-10-23 Coulter & Mckenzie Machine Company Wire-chain-link-forming mechanism.
US1360021A (en) * 1919-03-14 1920-11-23 Us Chain Machine for making links for chains
US1438474A (en) * 1921-01-19 1922-12-12 Berg Andrew Wire-chain-making machine
US3431723A (en) * 1960-04-14 1969-03-11 Wilhelm Wattler Chain making machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1244448A (en) * 1916-05-08 1917-10-23 Coulter & Mckenzie Machine Company Wire-chain-link-forming mechanism.
US1360021A (en) * 1919-03-14 1920-11-23 Us Chain Machine for making links for chains
US1438474A (en) * 1921-01-19 1922-12-12 Berg Andrew Wire-chain-making machine
US3431723A (en) * 1960-04-14 1969-03-11 Wilhelm Wattler Chain making machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104707932A (zh) * 2013-12-17 2015-06-17 上海埃鲁秘工业炉制造有限公司 一种新型的环链送料方法

Also Published As

Publication number Publication date
FR2098114A5 (enExample) 1972-03-03
SE377059B (enExample) 1975-06-23
CH533473A (de) 1973-02-15
DE2032692A1 (de) 1972-01-05
GB1347579A (en) 1974-02-27

Similar Documents

Publication Publication Date Title
US4843859A (en) Pipe bender
US3714776A (en) Apparatus for producing chain links
US3431723A (en) Chain making machines
US2821727A (en) Corrugated nail making machine having a combined wire feeding and rolling means
US3822548A (en) Method and apparatus of manufacturing c-shaped links
US1947449A (en) Filament making machine
US4694644A (en) Method and apparatus for producing oval chain links from round wire
JP2014000609A (ja) ２つの側部を有するデュアルプロセス弾薬帯
US3961474A (en) Method and apparatus for the manufacture of chains with round links, having varying mechanical characteristics
US1065336A (en) Coil-spring-forming machine.
US4886249A (en) Spring bands for incorporation in spring units
US2225853A (en) Method of and apparatus for making grids
US611714A (en) Machine for manufacturing sheet-metal hinges
US3025890A (en) Method of shaping wire stock
US408314A (en) Island
US2129605A (en) Machine for making bookbinder elements
US261977A (en) Machine for making split keys
US1865412A (en) Spoke making apparatus
US1778559A (en) Wire-bending mechanism
US3811268A (en) Apparatus for forming chain-links
US1157175A (en) Chain-link and the process of making and assembling same.
US568749A (en) Chain-machine
US788816A (en) Bail-making machine.
US1473855A (en) Method of and apparatus for making bushes and rollers for gear chains
US3152631A (en) Straightening and cutting of rod