US387184A - rogers - Google Patents

Description

(No Model.) 2 Sheets+$heet 1.

I v 0. D. ROGERS. DIE FOR FORMING AND THREADING THE POINTS OF SGREWS. V

110,387,184. Patented July 31, 1888.

(No Mbdel.) 2 Sheets-Sheet; 2.

(LU ROGERS DIE FOR FORMING AND THREAD ING THE POINTS OF SCREWS.

No. 387,184. Patented July 31, 1888.

y nuny l l lplmn1mmmnnmummmm y ill \ vENTL-J 676627! @J .Zi cigars,

rran S'ra'rns CHARLES D. ROGERS, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO THE AMERICAN SCREIV COMPANY, OF SAME PLACE.

DIE FQR FORMING AND THREADING THE POINTS OF SCREWS.

SPECIFICATION forming part of Letters Patent No. 387,184, dated .Tu1y 31, 1888.

(No model.)

To all whom it may concern:

Be it known that 1, CHARLES D. ROGERS, a citizen of the United States, residing at Provi deuce, in the county of Providence and State 5 ofRhode Island, haveinvented certain new and useful Improvements in the Method of Pointmg and Screw-Threading the Ends of Screws,

Rods, 8rd; and I do declare the following to be a full, clear, and exact description of the into vention, such as will enable others skilled in the art to which it appertains to make and use the same, reference bcinghad to the accompanylng drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to a new and improved method of pointing and screw-threading the ends of screws, bolts, or rods.

Said invention consists in subjecting a metallic rod (headed or plain) to the action of dies adapted to roll a V-shaped and screwthreaded peripheral groove therein at one operation.

It also consists in the novel construction of the dies for producing the said rolled and threaded beveled surfaces, all as will be more fully hereinafter set forth and claimed.

The object of my present improvements is to greatly reduce the cost of the manufacture 3c of screws and bolts, particularly of the class termed coach-screws. By means ofmy invention a rod having asufficient length to make two bolts is placed between a suitably-mounted pair of my improved rolling-dies, which gradually reduce (and at the same time elongate) the center portion of the rod to form a V-shaped neck. A further continuous movement of the dies simultaneously roll a screw-thread on each section of 0 the coneshaped neck of the rod, thereby producing by one operation two pointed and screw-threaded screw blanks or rods. The blanks thus made are then placed in the dies of a common bolt cutting machine and threaded up the shank, as usual,the thread of the rolled point serving asa leader in guiding the blank to readily engage themain threading-die.

Heretofore in making coach-screws or other analogous screws or bolts it has been the practice, so far as I am aware, to first form (by means of swaging or turning) a substantially conical-shaped point on the end of the rod or blank, then submitting the pointed blank to a bolt-cuttingmachine, which cuts the screwthread on the shank, and, finally, screwthreading thepoint in another machine or die.

By means of my improvement, as 3' net stated, I point and screw-thread the ends of two bolts at one operation.

In order to clearly illustrate my new method of pointing and screw threading the ends of two bolts or screws by the same dies at one operation, I have prepared the accompanying two sheets of drawings, in which- Figure 1 represents a double-headed rod in position between oppositely arranged and mounted dies, the latter shown in transverse section. Fig. 2 is a similar view of the same, the dies having been advanced, thereby forming the rolled double cone-shaped groove in the center of the rod, the rod being materially lengthened during the process. Fig. 3 is a similar sectional view, the dies having been farther advanced to produce the rolled screwthreads on the points and completing the oporation. Fig. 4 is a side view or elevation, corresponding to Fig. 1, showing the rod in position to be acted upon by the improved combined pointing and threading dies. Fig. 5 is a partial transverse section through the plain portion ol'one of the rolling-dies,taken on line 8 s. Fig. 6 is a sectional view through the thread-forming portion of the die, taken on line 0 0. Fig. 7 is a sectional view of the same, taken on line a: 00, showing the full depth of the thread-forming grooves. Fig. 8, Sheet 2, is a plan view, in partial horizontal section, showing the dies oppositely arranged and mounted in a stationary frame or bed, and also showing the blank (sectionally) in position to be acted upon by the dies. Fig. 9 is a re duced plan view showing a means for reciprocating the dies to form the rolled screwthreaded conical point on the end of two bolts 5 or screws at one operation. Fig. 10 is an end view ofa machine having two driven rolls on which the dies, adapted to point and thread the blanks, are circularly arranged and secured. Fig. 11 is a top view of the same. Fig. 10C 12 is an end view of a machine having a stationary die mounted therein, and also show improved dies.

ing a revolving cylinder carrying one of my Fig. 13 is a partial side view of the same; and Fig. 14 represents a revolving circulardie combined with a sector carrying a die of similar construction, each of said dies in the foregoing figures having a gradually-increasiug V-shaped plain projection, terminating in a fshaped projection 'havinggrooves cut in each side thereofadapted to form screw-threads.

The following more specifically describes the several steps employed in pointing, screi threading, and severing a rod of metal. It alsoinelqdes a description of the dies therefor.

Referring again to the drawings, A A designate the steel dies, the same, as drawn, being oppositely mounted to slide in stationary frames E, having aT-shaped longitudinal slot therein. Each of said dies A is provided with the raised \l-shaped reducing portion D, terminating in the raised ti-shaped threading portion D. The part D rises from the center point, e, in a gradually increasing and divergent longitudinal direction. At 0 it unites v with and forms a part of the threading-die D,

the latter being provided on each of its beveled sides with a series of grooves, 15, adapted to form a thread by rolling. The apexc of the raised portions of the die, formed by the intersection of the two beveled sides,extends length wise thereof in a horizontal plane.

The principle of forming screw-threads on the surface of arod or wire by rolling (instead of removing the stock by cutting) being generally understood, a more detailed description thereof is deemed unnecessary in this connec tion.

Each of the dies A is provided with a suit ably-connected rod, 1*, for operating the same.

Figs. 8 and 9 represent plan views of a machine adapted to give a reciprocating motion to each of the dies.

In Figs. 10 and 11 two cylindrical rolls, H, are shown secured to shafts i, mounted in bearings of the upright frames F, said rolls being driven in the same direction by means of suitably-driven gearing, g. A circularly- -arranged combined reducing and threading die, A, is formed on or otherwise secured to the periphery of each roll, said die consisting of the raised plain portion and the connected screw-threading part, substantially as just described with reference to the reciprocating dies A. In this machine, as well as the former one, the rod a simply turns on its axis while being submitted to the action of the traveling dies.

In Figs. 12 and 13 one of the dies A is secured to the stationary frame J and the other is secured to the cylinder H, mounted upon a driven revolving shaft, S. In this arrangement the blank rod (6 enters at the top between the two dies and rests upon the cylinder H. The latter, now, in revolving, in conjunction with the dies forces the rod a in the arrowdirection, (at the same time revolving also on its aXis,) so that as it passes out from thelower sense end of the stationary die the combined action 5 both dies have reduced and pointed the rod midway of its length and formed the screwthreads thereon, the rod then being substantially as represented in Fig.

The following describes the operation of the reciprocating dies, (although, if desired, one die may be stationary:) A rod, a, is first placed in a vertical position between the front and back dies, A A, as shown in Figs. 4 and 8. Now, upon imparting reciprocating motion to the dies by suitable means, the center points, 0, of the Vshaped portion D thereof immediately engage the red midway and 1mpress a slight circular groove therein. The continued movement of the dies enlarges the groove in all directions until the end 0 reaches the rod, at which time the groove forms the counterpart of the die at that point, thereby at the same time slightly elongating the rod, all as clearly shown in Fig. 2. The dies in their continued advance next present the V- shaped and grooved portion D to the beveled or conical sides of the rod lying between them,

thereby producing a small helical groove on each cone, which gradually deepens as the stock is rolled up therefrom and producing two complete screw-threaded points (see Fig. 3) at the termination of the stroke. Finally, the (now severed) blanks drop out, after which the dies are returned to the normal position shown in Fig. 8, again ready to reduce a rod, as before. The pointed and screw-threaded blanks are next fully threaded and finished,as usual--that is, by feeding them into the dies of a bolt or screw-cutting machine, the screwthreaded point serving as a leader in guiding the blanks to the threadingdies. Practically, in pointing and screw-threading the larger sizes of bolts by means of my improved method, I first properly heat the rod or bar at the point to be operated upon and prior to its being submitted to the action of the dies A. The arrangement or position of the said dies may be changed from that shown--as, for example, they can be placed horizontally and made to reciprocate one above the other.

It is obvious that long rods adapted for bridge-work, &e., maybe thus pointed,screwthreaded and severed by the employment of my invention, thereby more than doubling the production, as compared with the old method of pointing and threading each rod singly. After forming the screw-threaded point, the shank of the rod may be screw-threaded by means of a screw-cutting machine, as usual.

I do notclaim, broadly, mechanism involving dies adapted to simultaneously point and divide a rod of metal at the adjacent apices by rolling.

I claim and desire to secure by United States Letters Patent- 1. In a machine for double-pointing, screwthreading, and transversely dividing a rod of metal, the combination of a pair of oppositelyniounted dies, each having an ungrooved A- shaped rib projecting from its face, the same D, and a screW-thread-forming portion, D, secured to or formed thereon, of mechanism for reciprocating or operating said dies, and a frame in which the dies are mounted to travel, substantially as shown and hereinbefore described.

In testimony whereofI afiix my signature in 20 presence of two Witnesses.

OHA RLES D. ROGERS.

Witnesses:

CHARLES HANNIGAN, WM. R. DUTEMPLE.

Images