US1070121A

US1070121A - Process of manufacturing unwelded chains.

Info

Publication number: US1070121A
Application number: US75432913A
Authority: US
Inventors: Stefan Kiss V Ecseghy
Original assignee: Handelsgesselschaft Kleinberg & Co
Current assignee: Weatherford Artificial Lift Systems Inc
Priority date: 1913-03-14
Filing date: 1913-03-14
Publication date: 1913-08-12
Anticipated expiration: 1930-08-12

Description

S. K. v. EGSEGHY.

PROCESS OF MANUFACTURING UNWELDED CHAINS.

APPLICATION FILED MAR. 14, 1913.

1,070,1 21 Patented Aug.'12, 1913.

2 SHEETS-SHEET 1.

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s. K. v. EGSEGHY. PROCESS OF MANUFACTURING UNWELDED CHAINS.

APPLICATION FILED MAB-.14, 1913- Pa'tented Aug, 12,

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

STEFAN KISS v. EGSEGHY, 0F VIENNA, AUSTRIA-HUNGARY, ASSIGNOR TO THE FIRM OF HANDELSGESELLSCHAFT KLEINIBERG & 00., OF VIENNA, AUSTRIA-HUNGARY.

PROCESS OF MANUFACTURING UNWELDED CHAINS.

Patented Aug. 12,1913. Serial No. 754,329.

To all whom it may concern:

Be it known that I, STEFAN Kiss VON ECSEGHY, engineer, subject of the King of Hungary, residing at Vienna, lower Austria, in the Empire of Austria-Hungary, have invented a certain new and useful Improvement in the Process of Manufacturing Unwelded Chains, of which the following is a specification.

Methods for manufacturing weldless chains consisting of links composed of two eyes or annuli at right angles to each other are already known, in which the rings arev formed on the ends of the blank, after the latter has been passed through the eye of the preceding link. It has also been proposed to reinforce the ends of a blank by upsetting them after the blank has been passed through the preceding chain link, for the purpose of obtaining a more favorable distribution of the material for the subsequent formation of the annular halfeyes or annuli. This upsetting only produces a cylindrical thickening of the ends of the blank, so that although the proper quantity of material is provided for the formation of the annular half-eyes, the ends of the blank are not thereby given an appropriate form for facilitating the production of the annular half-eyes.

Now according to the present invention the bar-shaped blank, passed through a previously formed chain-link, is given at first adjacent to the two places where the half eyes will be formed subsequently on the ends of the blank a bending after the manner of a quarter circle, in which operation the ends of the blank may be pressed somewhat flat, whereupon these ends, while still held down, are spread by axially directed up setting devices to give them a flat circular shape, after which the stamping of the two half eyes at the ends of the blank, the removal of the bur and the bending together to form a new chain link take place. It will of course be understood that the bending and upsetting operations are effected in suitably formed swages, so that, before it is stamped each end of the blank has already been given such a form that the stamping is greatly facilitated.

The bending of the bar connecting the two annular half eyes to form a new annular eye should be efiected in such a manner that the material is subjected to the least possible strain so that the strength of the chain may not be endangered. In accordance with the present invention this bending into a circle is effected by simultaneously rotating the two half eyes toward each other, and progressively pressing them together, the material of the bar being simultaneously upset during the bending, so that no expansion of the outer layers of the material will arise. The combined rotary and progressive movement in the bending operation also renders it possible to form narrow circular eyes. Before the rotation of the half eyes toward each other the half eyes may be moved laterally toward each other for curving and upsetting the middle portion of the blank.

Subject matter of the invention are also unwelded chains manufactured according to the process described.

The invention is illustrated in theaccompanying drawing, in which Figures 1 to .21 represent the several phases in the manufacture, and also show diagrammatically the tools necessary for carrying the method into practice.

The method of chain manufacture in accordance with this invention is as follows:

The bar-shaped blank 1 (Fig. 1) is passed through a previously formed chain link 2 unless it is to form the first element in the chain. The two ends of the blank are then inserted between two pairs of

jaws

3 and 4 formed in such a manner that when they are pressed together, they first bend the blank 1 at places at some distance from the ends of the blank (Fig. 3) and finally also press the ends flat (Fig. 5). The quarter circle bends are formed at the places, wherefrom the projecting blank ends being subsequently formed into annular half eyes. In order to prepare the flattened ends of the blank 1 for the subsequent stamping of the annular half eyes, in such a manner that the stamping operation is facilitated, as shown in Figs. 7, 8 and 9, an upsetting tool 5 is inserted in the axial direction between the two

jaws

3 and 4 while they still confine the ends of the blank, the front end of this tool being approximately semi-circular in shape. As the

jaws

3 and 4 also comprise semi-circular shoulders, as shown in Fig. 9 which together with the semi-circular front face of the upsetting tool 5, form a circle, when the upsetting tool 5 is moved longitudinally each of the two flattened ends of the blank 1 is pressed into a flat circular shape (Fig. 9). Owing to the fact that the blank has already been partly bent and is firmly held between the bending jaws, the shaping described above can be effected without the provision of special means for holding the blank in position. The blank together with the length of chain already formed then passes to the stamping mechanism, which serves to form from the flattened ends of the blank 1, the annular half eyes which are brought together subsequently. This phase of the operation is illustrated in Figs. 11 to 13. The flattened circular ends of the blank pass between

stamping jaws

6 and 7, which, when pressed together, form the annular half eyes 8, and this phase of the operation forms arough edge 9 both internally and externally. The stainjiing jaws 7 can be formed in such a manner that upon the flat side of the annular half eyes they produce a recess 10 and a corresponding pro jection 11 which inter-engage when the half eyes are pressed together subsequently. The next operation is the removal of the rough edge 9 from the half eyes. lVith this object the blank is introduced between tools, one of which, as shown in Figs. 1st and15 consists of a central punch 12 and a bur severing ring 13, while the other tool consists of a die or anvil 1 1, the front face of which serves as asu'pportfor and corresponds to the flat side of the annular half eyes 8, and which in its center has a cavity corresponding to the punch 12. A ring 15 surrounds the die externally and is pressed resiliently forward to serve for removing the severed bur. Accordingly when the punches 12 and the bur severing rings 13 are forced against the half eyes, the flat sides of which bear against the dies 14, these half eyes are simultaneously perforated, and freed from the bur, the ring 15 being pressed back by the severing ring 13 (see the lower part of Fig. 14). On the severing ring 13 being then withdrawn, the ring 15 is pressed forward, by its spring or the like, and removes the severed bur. An important feature of this operation is that the perforation and the removal of the bur take place from the convex side of the annular half eyes and not from their flat side, and it is only in this manner that a clean out can be obtained.

Figs. 17 to 21 illustrate the bending of the blank to form anew chain link. As shown in Fig. 17 the blank with its stamped and perforated annular half eyes 8 is inserted between bending jaws 16, and firmly held in position by mandrels 17. Now in order to prevent the bar or web of the blank 1, located between the two annular half rings, from being bentonly in the middle when the two bending jaws with the bar between them are turned together, said two bending jaws 16 (Fig. 19) are moved laterally slightly toward each other whereby the bar is curved throughout its entire length. The bending jaws 16 are then rotated toward each other, around the center of the annulus to be forn'ied and around the mandrels 17, and simultaneously a progressive displacement of the bending jaws toward each other is effected, in such a manner that this progressive approach is slightly in advance of the rotation. By this means on the one hand an expansion and consequent weakening of the material of the bar is prevented while on the other hand the annular eye thus formed is rendered perfectly circular. Toward the end of the bending movement, that is to say when the two half eyes 8 will be bent with their fiat faces against each other (Fig. 21) the mandrels 17 are removed, while the bending jaws 16 are still pressed and then held together under pressure, in order to prevent the two half eyes 8 from springing apart. hen the bending jaws 16 are opened out the finished chain link falls out and the production of a new chain link can he proceeded with.

It should be noted that the stamping of two annular half eyes of a blank can be effected sii'nu'ltaneously, but with independent tools, whereby uniformity in the work is insured. The entire process of manufacture can be carried out in one heating and so speedily that while a link is being made the third or even the fifth previously formed chain link is still red-hot. The greater the thickness of the chain, the longer will the blanks retain the heat and the more readily can the opeations described above be distributed among a number of wort places, in the case of chains of small thickness it is advantageous to effect a number of operations at one and the same work place.

It is obvious that unwelded chains may be manufactured in several modifications within the principle of the process described.

What I claim is:

1. A process for manufacturing unwelded links consisting in bending a blank bar into quarter circles adjacent the portions from which the eyes will be subsequently formed, flattening said portions under pressure, and while still under pressure spreading the same by axially directed upsetting pressure to give them a fiat circular shape, stamping the flat circular portions to form the two eyes, and then bending together to form the chain link, substantially as described.

2. A. process for manufacturing unwelded links and assembling the same, such process consisting in threading through an eye of a completed link a bar-shaped blank, bending this blank into quarter circles adjacent the portions from which the eyes will be subsequently formed, said portions being flattened under pressure and While still under pressure being spread by axially directed upsetting pressure to give them a flat circular shape, stamping the fiat circular portions to form the two eyes, and then bending together to form a new chain link, substantially as described.

3. A process for manufacturing unwelded links, such process consisting in stamping the ends of a blank to form eyes therein and bending the middle portion of the blank into a circle by simultaneously moving the two eyes toward each other and progressively pressing them together to form a new chain link, substantially as described.

In testimony whereof I aflix my signature in presence of two Witnesses.

STEFAN KISS v. ECSEGHY.

WVitnesses SLEGFRIED NEUTRA, AUGUST Fuccnn.

Copies of this patent ma; be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.