US596126A - Horseshoe-calk - Google Patents

Description

'(No Model.)

A. H. ROWE. HORSESHOE UALK.

Patented Dec. 28, 1897.

ALLEN H. ROWVE, OF HARTFORD, CONNECTICUT.

'HORSESHOE-CALK.

SPECIFICATION forming part of Letters Patent No. 596,126, dated December 28, 1897.

Application filed M81011 1 1396- To all whom it may concern:

Be it known that I, ALLEN H. ROWE, a citizen of the United States, and a resident of Hartford, in the county of Hartford and State threaded socket is provided in the shoe and the calk is provided with athreaded portion fitting this socket. In the form of shoe-calk in which the thread on the shank terminates in the cylindrical body and no shoulder is provided on the calk to make close contact and fit tightly against the under surface of the calk itis quickly loosened in wear and drops out. In the form of horseshoe-calks in which the threaded stem extends upward from a shoulder it is necessary that the thread shall be continued down closely against the shoulder and that the latter should be left square and formed in a plane at right angles to the axis of the threaded shank, so as to enable the proper bearing of the shoulder against the under face of the shoe to be obtained.

The object of my improvement is to provide a horseshoe-calk so constructed as to completely obviate all difficulties not only in the use but also in the practical manufacture of the horseshoe-calk and to secure in my improved form the perfect operation of the calk.

To this end my invention consists in the details of the several features making up the calk and in their combination in the single structure, as hereinafter described, and more particularly pointed out in the claim.

Referring to the drawings, Figure 1 is a detail view, in side elevation, of the calk-blank partly formed. Fig. 2 is a detail top or plan view of this blank. Fig. 3 is a detail side view of the completed calk. Fig. 4 is a detail view in cross-section through a horseshoe Serial No. 583,598- (No model.)

and its threaded socket and showing my improved calk in place in the socket.

In the manufacture of my improved calk I make use of a bar of metal of the proper angular shape in cross-section, preferably square, and having welded in and through the center of the bar a core of steel. From the end of this bar and by means of suitable tools the calks are out, the first operation being the turning down of the cylindrical shank b and the making of a groove 0 around it and close against the square'shoulder cl. For a limited distance the bar is left at its original shape to form the base 6, preferably angular on its exterior, as shown, and the point is then turned down to the shape of the cone f, the calk then being cut off. On the shank b a thread is cut by means of a suitable tool, the thread running out where it reaches the groove, and the tops of the threads extend beyond the bottom of the groove-that is, the shank measured through the threaded portion is of greater diameter than when measured through the groove.

The completed calk is shown in Fig. 3 of the drawings, and such a calk is when screwed into the socket in a shoe readily turned in far enough to secure a firm fitand close contact of the shoulder on the top of the base against the under surface of the shoe, so that.

these parts act as a pinch-nut to hold the calk against rotary movement. The calk can neither be screwed farther into the socket nor,without the exercise of considerable force, unscrewed therefrom. Thorough experiment and use have determined the fact that the calk cannot be removed by accident and ordinary wear in the ordinary use of the shoe.

In the finished calk the thread on the shank 6 runs out before it reaches the face of the shoulder 01 on account of the presence of the groove 0 in the blank, the cutting edge of the die being able to complete the thread of full shape and height to the end of the run. In

cutting a thread on a shank which extends 5 from the fiat surface the face of the die strikes the shoulder before the thread is finished, and if the thread-cutting be continued the edge of the die cuts away this shoulder or bevels it, so that in the absence of the groove the thread is left unfinished at the inner end of the shank or else the shoulder is beveled so as to prevent its having the proper bearing.

By means of my improvement a horseshoecalk possesses all of the required features which enable the complete thread to be formed along the shank and a square shoulder left to form a tight and uniform bearing over the under surface of the shoe adjacent to the threaded socket.

I claim as my invention As an improved article of manufacture, the herein-described horseshoe-calk, the same comprising a solid base a angular on its exset forth.

ALLEN I-I. ROWE. lVitnesses:

ARTHUR BJENKINS, J. STERN.

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