US1061176A - Set-screw. - Google Patents

Description

H. G. HART.

SET SCREW.

APPLICATION nun MAY 6. 1910.

1,061,176. Patented Mayfi, 1913.

witnesses a H l A 6'4, Lduzan HUBER'J. c. Ii-ART, onnNroNvuLn, CONNECTICUT.

SET-SCREW.

Specification of Letters Patent.

Patented May 6, 1913.

Application filed May 6, 1910. Serial No. 559,777.

To all whom it may concern:

Be it known that I, HUBERT C; HART, a citizen of the United States, residing at Unionville, in the county of Hart-ford and State of Connecticut, have invented certain new and useful Improvements in Set- Screws; and I do herebydeclare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to let I a set screw, and the vertical section of the same.

ters or figures of reference marked thereon, Which'form a part of this specification.

This invention relates to improvements in method of making the same.

Heretofore in the manufacture of set screws, it has been necessary to provide a piece of metal equal to the greatest diameter of the proposed head of the screw and turn it thread the stem. This process is not only expensive, but is tedious andslow. The oss of material in shaping the screw is wasteful, which also adds to the cost of pro duction.

According to my invention I first-.form a head or cap from sheet metal, then cup and shape the Same as may be found most convenient. In the bottom of the cap or head when in the course of manufacture, a seat is formed to receive a screw or small bolt,the same being rigidly fixed to the cap in such manner as will prevent it becoming disengaged when in practical use.

The invention also relates to improvements in the details of construction and arrangement of parts Which will be hereinafter described and particularly pointed out in the claim.

In the drawings :-Figure 1 is a View of a blank from which the cap or head is formed. Fig. 2 is a conventional illustration of the manner of cupping or shaping the cap.- Fig. 3 is a- -view illustrating the manner of-forming the head at the top of the cap. Fig. 4 is a detail perspective view of the completed set screw. Fig. 5 is a Fig. 6 is a View of a slightly different form of the invention.

The numeral 1 indicates a roundblank from which the cap or head (hereinafter termed cap) is formed. The blank 1 is drawn up into substantially cup shape in down in proper shape, and thencross section, as shown in Fig. 2, and is then reversely cupped to form the upper head 3, as shown in F i'g. 3. The outer edge of the head is knurled, and in the flat base or bottom is formed a square opening 5.

After the cap is finished I secure thereto a bolt or screw'having a head 7, a square portion 8, and threaded stem 9. The bolt is inserted through the top of the cap, and the head rests on the upper surface of the flat bottom, the square port-ion 8, fitting snugly in the opening 5. The shape of the portion 8, and the opening 5, will necessarily prevent the cap turning independently of the bolt, but to insure a rigid connection between the two elements, the bottom edges of the square portion are swaged or flattened to prevent the bolt slipping through the opening. Hence by this construction the bolt and cap are effectually secured together against independent turning or displacement. In other words the ca 1) and bolt become a unit.

In the modification shown in Fig. 6, the bottom of the cap is elevated at the center and is formed with a threaded openin 10, to receive the threaded end of the olt. This construction will afford a tight and secure joint between the cap and bolt, however, I prefer the structure previously described.

A set screw constructed as described is considerably less expensive to manufacture than the means heretofore employed and substantially the same results are accomplished.

I find in actual practice that set screws made in accordance with my invention results in a saving of about two hundred (200) per cent. F urthermore, the convenience and simplicity of the manufacture of the caps, enables me to save considerable time, which I regard as a vital importance.

The head formed at the upper end of the cap serves to strengthen the structure, and especially precludes the possibility of the upper edge of the cap being crushed or collapsing when in use.

What I claim is:

A new article of manufacture comprisin a cupped cap formed of sheet metal, the sai cap having a fiat bottom formed wlth an opening, the walls of which are angular, the lower portion of the walls of the cap bein substantially vertical and annular an flare outwardly from the annular portion, and

\an angular portion fitting against the angular walls of the opening, and the threaded portion being of less] thence the said walls curve inwardly and form an annular bead to provide a finger grip, the top of the'cap being open, and a headed screw fitting in the opening in the bottom of the cap, the head of the screw being of less width than the diameter of the opening formed bet-Ween the edges of the cap forming the bead, said screw having to correspond with and 'the bottom of said cap.

diameter than the width of the opening in the bottom of the cap and extending below In testimony whereof I have signed my 15 name to this specification in the presence of two subscribing Witnesses.

HUBERT o. HART.

Witnesses:

NELLIE MI HART, WILLIS 0. HART.

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