US1249874A - Method of pointing and threading screws, bolts, and similar articles. - Google Patents

Description

y R. L. WILCOX. METHOD OF POINTING AND THREADING SCREWS, BOLTS, AND SIMILAR ARTICLES.

APPLICATION FILED JULY-21. 191s. 1,249,874. Patented Dean, 191?. Em1

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htlf'UI-IAI-tl) LESTER WILCOX, OF WATERBURY, CONNECTICUT, ASSIGNOR TOTHE WATER- BURY FARREL FOUNDRY AND MACHINE COMPANY, OF WATERBURY, CONNECTICUT,

a eonronarron or connno'rroor.

ME llI-IUIU F POlfNTING AND THREADING SCREWS, BOLTS, ANI} SIMILAR ARTICLES.

Specification of Letters Patent, Patented [bee 11, 1911 llriginal application filed August 23, 1915, Serial No. 46,940. Divided and this application filed July 21,

1916. Serial No. 110,517.

To all whom it may concern:

lie it known that I, RICHARD LESTER WILcoX, a citizen of the United. States, residing; at VVaterbur-y, in the county of New Haven and State ofConnecticut, have 1nvented a certain new and Improved Method for Pointing and Threading Screws, Bolts,

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'llti and Similar Articles, ofwhich the following is a specification, reference being had thereln to the accompanying drawings.

My invention relates to a new and improved method for pointing and threading screws, bolts and similar articles, preferably with dies. To these, and other ends, my invention consists in the method for pointing and thread i119; screws, bolts and similar articles, substantially as hereinafter described and illustrated in the accompanying drawing, wherein,-- y y c Figure 1 is a plan view of a pair of thread rolling dies which may be used in my improved process; a y y y Fin. 2 is a perspective view of one of such dies;

Fig. 3 depth gage removed;

Fig. l is an end view. thereof;

Fig. 5 is a face view ofthedenth gage;

Fig. 6 is an edge view thereof;

Figs. 7, 8, 9, 10 and 11 are enlargedsectional views of the die and depth gage, taken respectively upon linesA, B, C, D and E of figure 3, with the blankshown in connection therewith; and

F 1g. 12 1s a fragmentary plan now .of one.

of the dies and depth gage with the blank in contact therewith.

Heretofore gimlet. point screws have generally been produced by first pointing the blank in a shaving machine, lathe or snnilar mechanism and afterward forming the thread thereon or by rolling a V groove is a face view thereof withthe eachother during this movement,

timeand without the loss of any material, as is necessary under theol d practice.

One form of means for practising" my improved process is shown in the drawings,

wherein the numeral 2 designates the fixed die and 1 the movable die, both being of substantially the same shape, differing only in their length, the movable die being longer than the fixed die and provided notch 3.

with a guide These diesare secured in theusual way in any one of the common forms of thread rolling machine. Each die has an angle recess i in one side thereof at an angle to the top and bottom and upon the adjacent faces are the ribs 5, which are parallel to the side of the dies andterininate at their inner ends at the edge of therecess 4.

The front face of each of the dies is provided with the usual thread rolling grooves 6, which extend from the outer edges of the i blank as the end thereof passes over it.

The dies 1 and 2 are so arranged that the In practice, the cloak, headed at only one end, designated herein by the numeral 10, is placed between the dies in the usual manner, with the bottom end thereof resting upon the contact face 11 of the lip 9, its alinement being determined by the guide notch 3, and its then position being substantially shown in Fig. 12. The guide notch 3 is not essential to the operation of the device but is eommon in thread rolling dies.

As the movable die 1 advances parallel with the face of the fixed die 2, the thread is rolled upon the shank of the blank from lip 9 is slightly curved .to allow for the elongation of the the head down to a point near the bottom thereof, there being grooves 6 at this point to form the threads (see Figs. 7 and 8). As

the threads are rolled, the blank is slightly elongated by stretching toward its bottom end, the engagement of the rolled threads and grooves 6 preventing elongation in the opposite direction, until the threads are substantially completed and the blank is at that part of the die substantially designated by the line C in Fig. 3 and as illustrated in Fig. 9. At about this time the lower end of the blank is brought into contact with the ribs 5 and the elongated portion thereof is tapered by reason of its Contact therewith and is" ointcdsubstantially as shown'in Fig. 11. uri'ng this pointing operation the grooves in the side of the ribs 5 roll the thread on the screw until the completed blank is formed at that portion of the die substantially illustrated by line E in Fig. 8, and in Fig. 11. I

The blank is only supported by the lip 9 of the depth gage 8 until such time as the threads on the shank are of suflicient depth to insure the proper alinement of the blank in the die, and after this has been accomplished, the'blank passes beyond the lip 9, as shown in Fig. 9, and there is nothing to retard the elongating action of the blank through the thread rolling operation. This elongation of the blank continues while the thread is being rolled on the pointed portion, thusfacilitating the pointing operation.

If the metal in the blank is of such a nature that it will not flow by reason of the thread rolling operation, the blank is placed between the dies for substantially its full length, instead of slightly shorter, as is the case with the blank composed of metal capable of flowing freely.

It will be observed that in the embodiment of 'my invention, as herein described, gimlet pointed screws .or bolts are pointed and threaded without waste of material, and the old pointing operation wherein material is wasted is eliminated.

In minor details the means adopted to accomplish my new and improved method maybe altered'and I do not therefore limit myself to details thereof constructed exactly as shown and described, except as the scope of the claims requires.

Having described my ilivelitioinavliat I claim as new and desire to secure by Letters Patent, is:

1. A method of manufacturing articles as described, consisting in first rolling a thread on a portion of a blank and then progressively advancing the thread toward one end of the blank, elongating the blank toward the same end and tapering the elongated portion.

2. A method of manufacturing articles as described, consisting in first rolling a thread on 'a portion of a blank and then pregressively advancing the thread toward one end of the blank, elongating the blank toward the same end, tapering the elongated portion and finally forming a thread on the tapered elongated portion.

In a method of manufacturing articles as described, the use of dies which operate first to roll a thread on a portion of a blank and then progressively advance the thread toward one end of the blank, elongating the blank toward the same end, tapering the elongated portion and finally forming a thread on the tapered elongated portion.

4. In a method of manufacturing articles as described, the use of dies provided with a depth gage for a blank and operating to first roll a thread on a portion of the blank and then progressively advancing the thread to the end of the blank.

5. In a method of manufacturingarticles as described, the use of dies provided with an adjustable depth gage for a blank and operating to first roll a thread on a portion of the blank and then progressively advancing the thread to the end of the blank.

6. The process of pointing a blank and rolling a thread thereon without waste of material, which consists in rolling a thread upon a portion of the shank, which is elongated thereby, and then pointing and rolling a thread upon said elongated portion.

In testimony whereof I have hereunto affixed my signature.

RICHARD LESTER VVILCOX.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C.

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