US729770A - Pin. - Google Patents

Description

PATENTED JUNE 2, 1903.

J. JENKINS.

PIN. APPLICATION PILED novfz e, 1902.

N0 MODEL.

lairzesses;

Patented June 2, 1903.

PATENT OFFICE.

JOEL JENKINS, OF MONTOLAIR, NEW JERSEY.

PIN.

SPECIFICATION forming part of Letters Patent N 0. 729,770, dated June 2, 1903.

Application filed November 29, 1902. Serial No. 183,303. \No model.)

To all whom it may concerm,

Be it known that I, JOEL JENKINS, a citizen of the United States, residingat Montclair, county of Essex, and State of New Jersey, have invented a new and useful Improvement in Pins, of which the following is a specification.

My invention relates to improvements in pins, and particularly to an improvement in the construction of the head of the pin whereby the head is made larger than is ordinarily practicable when the head is struck up from the material of the pin-wire.

In the manufacture of the ordinary pin from wire it is practically impossible to form a head from the wire of a diameter greater than three times the diameter of the wire. 'It is often desirable to provide a pin of a given size with a head of a much larger relative size than is ordinarily provided. To do this, many expedients have been adopted, among the most common of which is the practice of forming a loop on the end. of the wire and shaping a hollow sheet-metal head over this loop. This method is objectionable, for the reason that the wire loop does not afford sufficient hold for the head and the latter soon works loose and falls off. Furthermore, since the interior of the hollow head is not entirely filled by the loop small quantities of acid from the platingbath enter the head, with the result that the cards upon which pins are mounted for the trade are often discolored by this acid, which runs down the shank of the pin. Another expedient consists in moldinga filler or foundation of soft metal, such as lead or solder, over the ordinary pin-head and then shaping a covering of sheet metal over this foundation.

Figure 1 shows the completed article. Fig.

2 shows the parts of my improvement assembled. preparatory to shaping up in the dies. Fig. 3 shows a cross-section of the completed pin-head, illustrating the disposition of the metal of the parts thereof after the shaping process has been completed. Fi g. 4 illustrates a metal strip from which the sheet-metal covering is formed, together with a blank before and after the shaping for the dies; and Fig. 5 illustrates an old form that leaves two 1101- low sides within the disk.

Upon the shank of the ordinary pin A, provided. with a head a, is threaded the softmetal eoncavo-convex disks B and (J. The disk next to the head, as shown in Fig. 2, is slightly larger in diameter than the pin-head a and presents its convex side to the under side of said head. The disk 0 is of a size small enough to bring its periphery well within the periphery of the disk B, and,as shown in Fig. 2, said disk 0 presents its concave side to the concavo side of B. It has been found by experience that when the parts are so shaped and relatively arranged on the shank of the pin the parts are crushed together by the dies and form a solid metal head without ridges on the exterior thereof. The dies used in forming these pin-heads are the ordin ary dies having the hemispherical coacting faces, with provision in one face to receive the shank of the pin. A sheet-metal head or covering F is first placed in one die and the pinhead and its complemental parts in the opposite die. The hemispherical face of the second die will shape the points fof the covering F closely around the shank of the pin, as shown in Fig. 1, and by reason of the solid filling of the head the interstices f between these points fare practically closed, making the head impervious to the platingacid. 7 i

'While I use a metal blank with the points f above described in my preferred construction, I have found in practice that it is also possible to form the head from a sheet-metal cup whose periphery is straight, as also shown in Fig. i.

It has been found in practice. that this method of forming a solid-headed pin is materially cheaper and results in a more nearly perfect article than in the methods herctof ore known. i

While I have described heretofore the preferred form of my device and a method which has proved successful in practice, my invention is not limited to the exact details of construction set forth.

What I claim, and desire to secure by Letters Patent, is

1. As an article of manufacture, a pin provided with a solid enlarged head, said head composed of the pin-head proper, a plurality of filling-pieces surrounding the shank of the a pin beneath saidhead, and an external shell.

2. As an article of manufacture, a pin provided with a solid enlarged head, said head composed of the pin-head proper, a plurality of concavo-convex filler-disks mounted on the shank of the pin, said head and filler-disk being surrounded by an external shell.

3. As an article of manufacture a pin provided with a solid enlarged head, said head composed of the pin-head proper-,a soft-metal concavo-convex disk adjacent thereto, with its convex side next to the. head, a concavoconvex disk of smaller diameter than the first and arranged adjacent thereto, and an external shell surrounding said head and disks.

4. As an article of manufacture, apin provided with a solid enlarged head comprising the pin-head proper, a plurality of concavoconvex disks of unequal size threaded on the pin-shank and an external shell.

5. As an article of manufacture, a pin pro- .vided with a solid enlarged head said head Witnesses:

NATHAN RUssELL, M. E. MATTHEWs.

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