US981624A - Thread-forming apparatus. - Google Patents

Description

' D. DREIER.

THREAD FORMING APPARATUS. APPLICATION FILED SEPT. 17, 1907. RENEWED JULY 13, 1910.

Patented Jan. 17, 1911.

' Siam-r0 z, Jazzzkzbfimim HUI"IllIIUIHIIIW'IIHII illllflllmllIUIIIIIIII!" DOMINIOK DREIER, 0F LIVINGSTON, MONTANA.

THREAD-FORMING APPARATUS.

Specification of Letters Patent.

Patented J an. 17, 19.11.

Application filed September 17, 1907, Serial No. 393,350. Renewed July 13, 1910. Serial No. 571,845.

and without removal of metal from the stock, to effect formation of threads on an object, the metal forming the valleys of the threads being com iiressed whereby the stock is rendered more rigid in character.

lVith the above and other ol jects in view as will appear as the nature of the invention is better understood, the same consists, generally stated, in forming threads upon stock without removing any appreciable portion thereof, whereby the weakening that results in threading tubular stock is largely obviated.

The invention consists further in certain novel features of construction and combination .of parts of a" threading device as will be hereinafter fully described and claimed.

In the accompanying drawings forming a part of this specification and in which like characters of reference indicate corresponding parts, Figure 1 is a face view displaying the manner in which the forming members are disposed when in operation. Fig. 2 is an enlarged detail view showing. the disposition of the cutter and of the chaser employed in connection therewith. Fig. 3 is a detail view showing the manner in which the threads are formed upon the stock, and also the appearance. of the stock at the concl usion of the-threading operation.

Referring to the drawings. 1 designates a die holder, which may be either the chuck of a threading machine or the holder of an ordinary hand die stock. Carried by this member are three die carriers 2, 3 and t which are of the usual construction.

The carrier Qis shown asequipped with an ordinary chaser or chasing die 5 and with one of the threaders 6 which form the novelty of the present invention, while the carriers 3 and 4 are each provided only with a threader. As shown in Fig. -1, the chaser extends inwardly a short distance beyond the periphery of the threader, While, as shown in Fig. 2, the chaser projects longitudinally some distance beyond the entering end of the threader. The threaders 6 are tapered or cone-shaped structures having peripheral ribs 7, which are disposed at right angles to the long diameter of their carryingslu1fts 8, the small tapered ends of the thrcadcr being disposed at the mouth or entering end of the die stock.

In threading a pipe or other article with this threading device, the work is inserted and the chaser will first contact therewith and cut the initial threads, and as the work is moved forward or as the die stock is moved downward, as the case may be, the smallest of the ribs of the threaders will enter the first thread, and operate progressively to draw the work through the chuck or die stock and thereupon sink into the metal and form the thread, it being understood that the. axes of the threaders are pitched at an angle of about one-half deg ee to the axis of the work, as shown in Fig. 2.

Owing to the tapered form of the threader 6 it will be. obvious that at the conclusion of the threading operation there will be left some unfinished threads, as shown in Fig. 3, that is to say, threads that are not the same depth as those at the entering end of the stock. This is of advantage, inasmuch as by having the stock slightly tapered at the point where the threads cease, connection between the stock and coupling will be of a more stable character.

lVhile but three of the threaders 6 are herein shown it will be obvious that if desired a greater number may be employed and as this will be readily appreciated detailed illustration thereof is omitted.

DOMINICK DREIER.

Witnesses:

E. M. NILES, ELBER'I F. ALLEN.

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