US485581A

US485581A - Watchcase-pendant

Info

Publication number: US485581A
Authority: US
Publication date: 1892-11-01
Anticipated expiration: 1909-11-01

Description

(No Model.)

T. A. HOPKINS. WATOHGA-SE PENDANT.

No. 485 581. Patented Nomi, 1892.

UNITED STATES PATENT OFFICE.

THOMAS A. HOPKINS, or ELGIN, ASSIGNOR TO M. o. EPPENSTEIN & 00., or

CHICAGO, ILLINOIS.

WATCHCASE- PEN DANT.

SPECIFICATION forming part of Letters Patent No. 485,581, dated November 1, 1892.

Application filed August 6, 1892. Serial 110.442.3530. (No model.)

To (ZZZ whom it may concern:

Be it known that I, THOMAS A. HoPKINs, residing at Elgin, Kane county, Illinois, have invented certain new and useful Improve- 5 ments in Pendants for Watchcases, of which the following is a specification.

The object of my invention is to provide simple and efficient means by which the stemarbor of a watchcase-pendantmay be held at [O the limit of its differentlongitudinal motionsfor the purpose of winding the mainspring or setting the hands of a watch-movement without in any way interfering with the free rotation of the said stem-arbor; and my invention consists in the arrangement and construction of parts hereinafter described and claimed.

Referring to the drawings, Figure 1 repre sents a vertical sectional view of my improvements, showing the stem-arbor held to its outer limit of longitudinal motion. Fig. 2 is a like View showing the stem-arborheld at its inner limit of longitudinal motion. Figs. 3, 4E, and 5 are details of the principal parts of my improvement, which are hereinafter described.

In constructing my improved pendant for watchcases I use the ordinary watchcase-center A, to which is attached a hollow threaded pendant B. Adjustablysecured in the pendant is a screw-threaded bushing 0, having an axialopeningextendingthroughit. Thelower edge 0 of the opening is preferably beveled at a suitable angle, while immediately above the same is an internal circular stop-groove c. Fitted loosely in the bore of the bushing O is the stem-arbor D, which has the usual corrugated crown at its outer end, and its inner end is squared to fit the squared opening of the main pinion of the stem-driven train in a watch-movement. The stem-arbor D is provided with an annular groove cl, into which is fitted a cylindrical ring E, the ends of which, not being joined together, leave an opening 6, which permits the ring to be compressed into a smaller circle when itimpinges the beveled edge 0 of the threaded bushing C, while the stem-arbor is being drawn outwardly until itpasses through into the circular groove 0', when it again expands and prevents any further outward motion of the stem arbor. It will be noticed by an examination of the drawings that the inner diameter of the ring E is somewhat larger than the diameter of the groove d, so that the stem-arbor is held loosely and there is no friction to overcome in rotating the same. In pushing in the stem-arbor the ringEis again compressed until it passes through the narrow portion of the bore, when it again expands, thereby preventing the outward movement of the stemarbor again until more than ordinary force is used.

The stem-arbor is prevented from being pushed in too far by the face I) of the watchcrown impinging against the upper edge 0 of the threaded bushing. There is a sufficient amount of extra play left between these parts, so that the device can be used in connection with hunting-case watches as well as in openface watchcases.

I am aware of the fact that numerous devices have been patented for accomplishing similar results as my invention by altogether different means, and while I do not claim my invention in the broadest sense I do not in- 5 tend to limit myself to the exact form or arrangement of parts as are hereinbefore shown and described, but do depart therefrom as nocessity may demand or occasion warrant without departing from the spirit of the in- So vention.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

As an improvement in pendants for watchcases, in combination with a hollow pendant,

a bushing adjustably secured therein, provided with an internal stop-groove, a compressible ring mounted loosely on the stemarbor and adapted to spring in and out of said groove, and the longitudinally-rotatable stem-arbor carrying the compressible ring, substantially as described.

THOMAS A. HOPKINS.

Witnesses:

Or'ro A. STARKE,

M. ABRAHAM.