US435802A - Process of manufacturing watch crown-pieces - Google Patents

Description

(No Model.)

A. G. DALZELL, J1

No. 435,802. Patented Sept. 2, 1890.

jjij u/fg lg gfi B) (Lu/HM} A TTORNE Y8 UNITED STATES PATENT OFFICE...

ALLAN DALZELL, JR, OF' SAG HARBOR, NEIV YORK.

PROCESS OF MANUFACTURING WATCH CROWN-PIECES.

SPECIFICATION forming part of Letters Patent No. 435,802, dated September 2, 1890.

Application filed December 16, 1889. Serial No. 333,956. (No specimens.)

To all whom, it may concern:

Be it known that I, ALLAN O. DALZELL, J r., of Sag Harbor, in the county of Suifolk and State of New York, have invented a new and useful Process of Manufacturing \Vatch Crown-Pieces, of which the following is a full, clear, and exact description. A

My invention relates to improvements in the manufacture of watch crown-pieces, of crown-cores for the same, and in the manner of attaching the crown-shells to said cores; and the object of my invention is to provide an improved watch crown-piece and a cheap and efficient process of manufacturing crowncores and of attaching the shells to the same.

To this end my invention consists in a watch crown-piece and in the process of man ufacture, which will be hereinafter fully described, and specifically pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, which illustrate the articles at different stages of manufacture, and in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a side and end elevation of a rod from which the said crown-cores are cut; Fig. 2, a side and end view of said rod with corrugations upon its surface; Fig. 3, a longitudinal section of the corrugated rod, showing a crown-core cut therefrom; Fig. 4, a longitudinal section of a crown core and shell, the crown-core being inserted in the shell ready to have the shell closed upon it; and Fig. 5, the same section, but with the crownshell closed over the crown-core.

The crown-pieces consisting of the shell A and core B, with stem B, are attached to stemwinding watches, the watch-pendant being slipped over the stem B, and the crown-piece serving as a handle to turn the winding mechanism, the core B being inserted in the crownshell A to stiffen the same.

My process of manufacture is as follows: I take a rod 0, of brass or other suitable material, of the same diameter as the crown-core A, and draw it through an especially-prepared draw-plate, which corrugates said rod throughout its entire length, the corrugations being of the same size as the corrugations of the crown-shell A. The rod is then placed in a suitable screw machine or lathe, which turns the stem B to fit the watch-pendant and which chambers the crown-core B around the inner end of the stem B, as shown in the drawings, the chamber a thus formed being deepest next the stem and tapering to the edge of the crown-piece. A forming-tool is then brought against the rod 0, which rounds the outer end of the core B, forms a nipple b thereon, and cuts the core from the rod. The corrugations will thus be left on a little more than half the outer surface of the core B- i. 6., on the part not rounded by the formingtool. The crown-piece is then placed in the crown-shell A, which is of the usual construction, being a hollow corrugated shell open at one end, so that the corrugations of the core will fit the corrugations of the crown-shell, and the nipple b will fit into acorresponding socket b at the inner end of the crown-shell A. The crown-core B and shell A' are then placed in a device which closes the shell over the core and crushes in the chambered end of the core B upon the stem B, thus firmly uniting the core B and shell A and forming a smooth oval crown-piece, as shown in Fig. 5.

I have not shown the machinery for manufacturing the crown-piece, as I claim the process above described and the crown-piece manufactured in this way without regard to the machinery employed.

Having thus fully described my invention, I claim as newand desire to secure by Letters Patent 1. The herein-described process of manufacturing watch crown-pieces, which consists, essentially, in corrugating a rod of the same diameter as the watch crown-core, placing said rod in a suitable machine, and turning the stem and chambering one end of the crowncore around said stem, and bringing a forming-tool against said rod, so as to round the other end of the crowncore and cut the core from the rod, substantially as described.

2. The herein-described process of manufacturin g watch crown-pieces, which consists, essentially, in corrugating a rod of the same diameter as the crown-core, placing said rod in a suitable machine, and turning the stem and chambering one end of the crown-core around said stem, bringing a forming-tool against said rod, so as to round the other end of the crown and cut the core from the rod, placing said crown-core in the crown-shell, and closing said shell and chambered end of the core around the stem of said core, substantially as described.

3. In the manufacture of Watch crownpieces, the herein-described process of attaching the crown-shell to the crown-core, which consists, essentially, in placing a crown-core having one end chamber-ed around the stem thereof in the crown-shell and closing said crownshell and chambered end of the crowncore around the stern of the crown-core, Substantially as described:

ALLAN C. DALZELL, J R. Witnesses:

HARRY A. STEVENSON, JOHN WQSPATOHER.

Images