US986697A - Mechanism for making bolts. - Google Patents

Description

P. 4P. DEBDS. MECHANISM FOR MAKING BOLTS. APPLICATION PILED-DBO. 17, 1909. 986,697, Patented Mar. 14, 1911.

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UNITED STATES PATENT OFFICE.

FRED F. DEEDS, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-THIRD TO FRANK MCHALE .AND ONE-THIRD 'IO ANTON B. SPURNEY, OF CLEVELAND, OHIO.

IVIECHANISM FOR MAKING BOLTS.

To all whom it may concern:

Be it known that I, FRED F. Danos, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Mechanism for Making Bolts, of which the following is a speci.- lication.

This invention is a means for making bolts, screws and similar screw threaded articles, and has for its object to provide improved devices involving the use of shaping and cutting off dies, dies for swaging the threads on the stock, and dies for finishing the threads by a cutting action.

The manner of operating the devices will be apparent from the following description in connection with the accompanying drawings illustrating the improved means used for producing the articles.

In the accompanying drawings-Figure 1 is a horizontal section of the dies for forming a bolt. Fig. 2 isa section on the line 2 9. of Fig. 1. Fig. 3 is a face view of one of the dies. Fig. 4 is a cross section of a partly completed bolt formed by the dies.

The dies shown as the selected means for producing the articles may be applied to or adapted for use in various bolt or screw making machines, and in the operation the stock or blank rod l is fed lengthwise between two swaging dies 4 and 4 having opposite semi-circular depressions 4b for forming and gripping the rod, threads 4a for producing the threads on the bolt, and shaping projections 4c for shaping the end of the bolt and assisting in cutting olf the same. When the swaging dies thus described are pressed together on the rod it is clamped and shaped at the part 5 and the threads are swaged thereon, the projections 4c cutting into the stock to form the tapered point. The diameter between the threaded parts of the dies is a trifle larger than the bolt diameter, to allow for the expansion incident to the impression of the threads.

The swaging action thus described will produce fins or feathers 5C (see especially Fig. 4) extending along the bolt and across the threads thereof, on opposite sides, incident to the expansion produced by the pressure of the dies, and which cannot well be avoided. These tins are removed by sliding both of the swaging dies, with the stock therebetween, in a lateral direction between Speccation of Letters Patent.

Application tiled December 17, 1909.

Patented Mar. 14, 1911.

Serial No. 533,534.

a pair of Xed cutter plates 8 which have straight or parallel threads 8a located in line with the threads of the swaging dies, which have complementary grooves or threads in the sides thereof as indicated at 4EL in which the threads 8a travel when the dies are moved laterally, and when the part-s are so moved thv edges of the cutter 8 shear or cut the fins'. .v from the stock, and at the same time the transverse cutter 3, liXed across the space between the cutters 8, cuts off the bolt from the remainder of the stock, the bolt passing to the position shown iu dotted lines in 1. The head of the bolt must then be formed, and this is done by a reciprocating die 6, having a concave face. This die is forced lengthwise against the projecting end of the bolt blank and a head is swaged thereon, as also shown in dotted lines in Fig. 1. The head forming die may have a rib 6a for producing a kerf in the head of the bolt, if desired. Obviously the head may be shaped otherwise. The head die 6 is then backed off and the swaging dies 4 and 4 slid back to original position and then separated to allow the completed bolt to drop out and to receive the end of the rod for the next bolt. The shear action of the parts S may form slight flattened portions on the sides of the bolt, but this imperfection will be immaterial to ordinary use of the bolt. For producing a squareended bolt the projecting portions 4C ofthe swaging dies may be omitted.

I am aware that bolt blanks have been made between swaging dies, and the blanks subsequently worked by cutting or rolling to produce the threads thereon, thus requiring two operations. The present invention enables bolts to be produced by a continuous operation, and in one mechanism, and the dies have the further advantage that they may be operated by existing automatic machines with possibly slight variation of the die mechanism, the particular means for. operating the dies being immaterial. The stock to be worked is preferably annealed, and the bolts afterward tempered.

What I claim as new is 1. In a mechanism for making bolts, screws, or the like, the combination of a pair of thread-swaging dies, and cutters at opposite sides of the dies, to remove fins produced by the swaging operation.

2. In a mechanism for making bolts,

Screws, or the like, the combination `of 0pposed clamping and .thread-swagmg dies, and cutter plates at opposite sldes of the f dies, the contacting sides of the dies and cutter plates having complementary straight threads, and the dies being movable laterally between said plates, while the bolt blankv is clamped therebetween, to trim `0E the fins produced by the swaging operation.

3. In a mechanism for making bolts, screws, or-the like, `the combination of opposed'thread-swaging dies, between which the stock is clamped, and ymeans to trim the sides of and cnt olf the bolt blank, while it is so clamped. v y Y 4.111 --a mechanism for making bolts,

screws, or the like, the combination of opposed clamping `and. thread swaging dies,

cut-ters at opposite Sides of said dies for trimming the blank, said dies being movable laterally between said cutters while the blank is clamped therebetween, a cutting olf -cutterat one end of the dies, anda header l,Copiesofthispatent may be obtained forvecents eachfby addressing. the Commissioner of Patents,

Washington, D. C.

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