US1422274A - Method and apparatus for making headed machine parts - Google Patents

Description

Patented July M, 1922o cere-N trice;

DAVID EMANUEL JOHNSON AND THORVALD AUGUST MADSEN, OF ROCKFORD, -IlJllLI- v NOIS, ASSIGNORS TO NATIONAL LOCK COMPANY, OFROCKJFOB,D,' ILLINOIS, A COR- TORATION 0F ILLINOIS.

METHOD AND APPARATUS FOR MAKING `HEADEI) MACHINE PARTS.

To all whom it may concern:

Be it known that we, DAVID EMANUEL JOHNSON and THORVALD AUGUST M ADSEN, citizens of the United States, residing at Rockford, in the countyv of Winnebago and State of Illinois, have invented certam new and useful Improvements in Methods and Apparatus for Making Headed Machine Parts, of which the following is a specification.

Our invention relates to the lmanufacture of machine parts and more specifically to the manufacture of bolts,v screws and the like, the heads of which are formed by upsettingthe ends ofy the pieces of plain stock from `which the parts are made.

An object of our invention is to finish thehead of the vboltin a single machine.

Furtherl objects and advantages of our invention will become apparent as the description proceeds.

In the accompanying drawings Figure 1 is I a plan view illustrating as much as is necessary of a bolt heading machine. Figs. 2 and 3 are vertical sections through the center of the dies indicating the two steps or stages of the process, and Fig.`4 is aview of Aa special type of head. l

In. the embodiment of our invention selected for illustration, a main frame 10 carries a horizontally slidable ram 11 in which the punch block 1.2 is mounted for vertical sliding motion in suitable guides. A bar 13 of stock is periodically advanced to protrude its end the proper distance from the die block 14 and cut off by a transversely moving cutter 15 having fingers 16 which grip the cut-0H portion,and carry it across to a position in front of the die. As soon as the first punch 17 has advancedfar enough to i start the cut-olf pieceinto the hole 18 in the die 19,` the fingers'l are withdrawn. A

vknock-out rod 20 is seated in the hole 18 in the die 19 and limits the entry of the bolt 21l so that the first punch can upset the projecting portionto vtorm a head 22. After the first punch has perated, and upset the protruding stock, aosecond punch advancesand forms the head \complete, after which -a knock-out lever 24 is automatically actuated to move the knock-out rod )forward Vand eject the finished bolt. The position of rest of the knock-out lever 24 determines the limiting position of the rod 20 and may be adySpecification of Letters Patent.A l lPafdymltt.d July 1ML, 19225 Application mea July s,

1920. Serial No. 394,671.

justed by suitable means such, for instance, as an adjustable set screwv25 suitably mounted 1n a stationary part of the machine.

The above described parts and operations in and of themselves are old and well known in the art and form no part of our present lnvention. l

As illustrated in Fig. 2, the operation of the punch 17-to form the head -22 leaves a iin 26 around the upper portion of the head. It has heretofore been customary to deliver the bolt in this condition from the`heading machine and subsequently to remove the fin by passing the bolts through a shaving die in another machine.

According to our invention, after the formation of the head, as `shown in Fig. 2, the punches are retracted 'and the knock-out rod 2O `is automatically advanced as indicated in Fig. 3 so that the fin 26 is separated from the die 14. The advance of the second punch 23 will then shave and clean the sides of the head 22 and strip the fin 26 from the upper edges ofthe head. When the punches are retracted the second time, the knock-out lever is actuatedto deliver a completely finished bolt from the machine.

Any suitable means for advancing the knock-out rod 20 between the step illustrated in Fig. 2 and the step illustrated in Fig. 3 mav. be employed. We have shown a spacer ro 27 interposed between the knock-out lever 24 and the adjusting set screw 25. ThisI spacer rod has a narrow end' portion followed by a thicker portion, and immediately upon the completion of the formation of the head, as in Fig. 2, it is displaced longitudinally to the position shown .in Fig.

3, shifting the knock-out lever 24 slightly and protruding the bolt. l

The bolt we have illustrated in Fig. 4 is a blank for a squarehead oval top set screw. The blank is to be pointed and threaded before it isa finished set screw. In forming such a part the squared head 22 is formed inthe die which is shaped for this purpose. The oval shaped top of the head is formed by the first punch. This punch does not advancev close to the face of the die, but leaves a small opening between the faces of the punch and the die, so as to permit the surplus material to flow out laterally. This leaves a fiash or fin, which is shaved 0H by the second punch as shown in Fig. v3.

The completion of the bolt head in one machine has several advantages. It simpli-` fies the machinery employed. It makes-it possible to automatically finish in one m'achine, a large number of shapes that Would be diiiicult to automatically feed into another machine, for example, Where the diameter of the body and the head across the flat are approximately the same, or Where the length of the body under the head is very short in proportion to the height of the head. Another advantage is that Where bolts have irregularshaped heads, it is very difficult to` automatically transfer these into another machine so that the shape of the head registers correctly With the shaving'die.

While We havegshown and described our inventionappliedto a double stroke heading machine, using the first blow for upsetting or making the head, and the second for shaving the head, it should be understood that a machine designed to make three or more strokes can be employed. It will be evident to anyon,f e..v.;skilled in the art, that only a limited -amount of stock can be forced into the head in one blow, and for this reason, on bolts having large heads two or more blows Will be necessary for producing the head. Also, on Work Where a very fine finish is necessary, two shaving punches may be employed. Many other modifications and variations will naturally occur to those skilled in the art and the accompanying disclosure should therefore be considered as illustrative only. We aim in the subjoined claims to cover all legitimate variations and modifications of the inventive idea disclosed. We claim as our invention:

l. The process of forming a headed member comprising the step of supporting a blank in a die, the step of shaping the body of the head, the step of protruding the blank from said die, and the step of shearing the fin from the protruded blank. 2. The process of forming a nished headed member in a single machine comprising forming the main body of the head, shifting the position of the stock, and subsequently shearing the 1in from the head.

3. A unitary mechanism for manufacturing finished headed members comprising means for forming the body of the head, means for shearing the fin from the head, and means for ejecting the finished article.

4. A unitary machine having, in combination, a die, a pair of' movable punches, means for supporting a piece of stock in said die in alinement with one of said punches,

means for advancing one of said punches to.

shape the end of the piece of stock, means for shifting said punches to position the other punch in alinement with said stock and for protruding said stock from the die, means foradvancing the second punch to shear off the fin formed by the first punch, and means for ejecting the finished heade article.

In testimony whereof We have hereunto set our hands.

DAVID EMANUEL JOHNSON. THORVALD AUGUST MADSEN.

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