US402271A - Frederick mutimer - Google Patents

Description

, F. MUTIMER. 7 METHOD OF MANUFACTURING SET SUREW BLANKS.

PatentedApr. 30.-.188,9.

UNITED STATES PATENT OFFICEa FREDERICK MUTIMER, OF ROCKFORD, ILLINOIS, ASSIGNOR OF ONE-HALF TO THE ROCKFORD BOLT WORKS, OF SAME PLACE.

METHOD OF MANUFACTURING SET-SCREW BLANKS.

SPECIFICATION forming part of Letters Patent No. 402,271, dated April 30, 1889.

Application filed December 8, 1888. Serial No. 293,031. (No model.)

To all whom it may concern:

Be itknown that I, FREDERICK MUTIMER, a citizen of the United States, residing at Rockford, in the county of Winnebago and State of Illinois, have invented a new and bar enough material to form two set-screw blanks at the same operation that their rectangular portions are formed.

The third object is to form the'rectangular portion of two set-screw blanks and after ward transversely cutting the rectangular portion, thus forming two complete set-screw blanks.

The dies for carrying out my improved process are represented in the accompanying drawings, in .which Figure 1 is an isometrical representation. Fig. 2 is a horizontal central section showing two sot-screw blanks in position in the dies, also the gage for determining the length of the blanks. Fig. 3 shows a section of the face of the dies. Fig. 4 is an isometrical representation of two setsorew blanks as they come from the dies. Fig. 5 is an isometrical representati'on of the complete set-screw blank.

' Fig. 6 is an isometrical representation of a setscrew blank with a finished head.

The dies in this instance are rectangular in form, and consist of two like halves, 1. and 2. The meeting faces of these dies are formed in semicircular grooves 3 of the diameter of the bar material from which the blanks are made. A portion of these grooves are in rectangular form, as shown at 4. The length of this rectangular portion is sufficient to form the rectangular portion of 'two set-screw blanks. A guide-plate, 5, is formed with perforations 6, through which the bar material is fed to the dies. A gage, 7, (shown in Fig. 2,) is placed at the proper distance from the face of the dies to limit the length of bar material fed to the dies. This gage may be adjusted to or from the face of the dies, as occasion may require. The guide-plate 5 and one half of the die are held stationary in a suitable manner, while the remaining half of the die is made removable to and from the stationary half:

The bar, 8, from which the blanks are made is passed through the opening in the guideplate until it reaches the gage. The movable part of the die is then caused to approach its stationary half. In this movement the projecting portion of the bar will be cut off, the edges 9 forming the knife. The bar will then be compressed between the faces of the dies and the rectangular formation given to it, as shown at 10, Figs. 2 and 4. The movable portion of the die is then returned, and the cut-01f portion will be released from the dies and the operation repeated. The cutoff portion of the bar, having its central portion reduced in rectangular form, is out about the center of the rectangular portion, as shown by dotted lines, 4. Each half will constitute a complete set-screwblank,which is properly threaded in the usual manner. The process of cut ting the bar will not leave the cut surfaces of the rectangular portion in the best shape, but will answer for a cheap blank. When'a better-finished blank is required the end of the rectangular portion is finished by taking off the corners, as shown in Fig. 6.

It is evident that by setting the gage nearer to the face of the dies, as shown in dotted lines, Fig. 2, I am able at a single operation to produce two set -screw blanks difiering in length. The same result can be obtained by varying the position of the rectangular portion 4 cf the groove 6 with respect to the length of the groove.

I do not limit myself to a square-headed set screw blank, as a hexagonal head can be produced in the same manner.

In carrying out my improved process it is not necessary to heat the bar material from which the blanks are made, as I have formed blanks from the bar in the cold state.

The dies illustrated in the accompanying drawings is one form of means for carrying out my process; but evidently other forms may be devised for accomplishing the same result.

I claim as my invention 1. The herein-described process of manufacturing set-screw blanks, consisting in rc= dueing in a single operation a section of the bar material to a polygonal form of sufficient length to form the polygonal portion of two set-screw blanks, substantially as set forth 2. The herein-described process of manufacturing set-screw blanks, consisting in feeding material enough to form two blanks, cutting it from the main bar, and reducing in a single operation a section of the cut portion to a polygonal form of sufficient length to form the polygonal portion of two set-screw blanks, substantially as set forth.

3. The herein-described process of manufacturing set-screw blanks, consisting in feeding material enough to form two blanks, cutting it from the main bar, reducing a section of the cut portion to a polygonal form. of suf- FREDERICK MUTIMER.

Witnesses:

CHARLES R. WIsE, A. O. BEHEL.

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