US415669A

US415669A - Watch case spring

Info

Publication number: US415669A
Authority: US
Publication date: 1889-11-19
Anticipated expiration: 1906-11-19

Description

(No Model.)

H. R. GAUL. WATCH CASE SPRING.

No. 415,669. Patented Nov 19, 1889.

A, """lllllll I I I 17 1 INVENTOR:

W TN ESSES:

UNITED STATES PATENT OFFICE.

HARRY R. GAUL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE KEYSTONE IVATCII CASE COMPANY, OF SAME PLACE.

WATCHr-CASE SPRING.

SPECIFICATION forming part of Letters Patent No. 415,669, dated November 19, 1889.

Application filed May 29, 1889. Serial No. 312,529. (No model.) I I To all whom it may concern:

Be it known that I, HARRY R. GAUL, of Philadelphia, Philadelphia county, Pennsylvania, have invented an Improvement in WVatch-Oase Springs, of which the following is a specification.

My invention relates to watch-case springs; and it consists of certain improvements, which are fully set forth in the following specification and shown in the accompanying drawings, which form a part thereof.

It is the object of my invention to form an effectively operative watch-case spring in an economical manner, and my invention applies equally to the lift-spring and to the snap or look spring.

In carrying out my invention I construct a curved spring of sheet metal provided with the snap or lifting projection at about its center. This spring is held within the watchcase by means of flanged projections upon its ends, which engage in notches or cuts formed in the edge of the watch-case center. In this manner the spring is supported only at its ends, and, being of tempered sheet metal, possesses excellent flexibility at the center or operative portion.

By this invention the screws and similar devices for attaching the springs to the watchcase center are dispensed with, since the tension of the spring forces the flanged ends firmly into the cuts or recesses in the center, and thereby retains the spring in place, while allowing it to be readily removed, when desired, by the introduction of an instrument. By inserting the usual dust-band these ends would be firmly locked in place.

projecting ends D, preferably extending slightly above the upper edge of the spring.

E is the push-pin of the watch for operating the snap, extending through a hole 6 in the snap-spring.

F is the liftspring, which is constructed similar to the snap-spring O, and having the lifting projection f. The watch-case center is provided with notches or cuts a upon its edge adapted to receive the flanged or projecting ends D of the springs C and F. It is preferable that the arc of the circle describing the distance from one notch a to the other should be slightly less than the length of the spring, so that when the spring is secured to the watch-case center its central portion, carrying the snapping or lifting projection, will extend a distance into the groove of the center, as shown in dotted lines in Fig. 1, to allow play in the groove of the center for the spring in operating, and by thus forcing in the central portion of the spring the pressure upon the ends D is increased, so that they are more firmly held in the notches a. I prefer also to have the upper edges of the spring taperin g toward the central portion, where the snap or lifting projection is located, as shown in Figs. 2 and 3, so that the spring is made narrower and that there may be no friction between the upper or lower edge of the spring and the watch-case center, whereby the easy operation of the spring might be impeded.

Itis evident that the insertion of the usual dust-rin g or the watch-movement would look the ends D of the springs in the center in the positions shown in Figs. 1 and 2.

While I prefer the details of construction here shown, I do not limit myself thereto, as it is apparent that they may be varied in many ways without departing from the spirit of the invention.

WVhat I claim as new, and desire to secure by Letters Patent, is

1. A watch-case spring consisting of a curved piece of thin metal provided with a projection at about its middle for operating on the lid and having laterally-proj ecting flanges D on its ends formed of a greater width of metal than the body portion of thespring, and thereby extending beyond the edge of said body portion, for the purpose of attaching the spring Within the watch-case center.

2. The oombinatiomwith a Watch-case center formed with notches upon its ledge, of a case-springhaving its body portion formed of thin spring metal of less depth than the groove of the center, so as to be free to move therein, and provided on its ends with projections extending laterally in the plane of the body of the spring and fitting into the notches 011 the ledge of the center for the purpose of securing the spring therein.

3. In a watclrcase, a case-spring consisting of a curved piece of thin metal having a projection at about its middle for operating on the cover and provided on its ends with lateral1y-proj ecting flanges, in combination With the watch-case center formed with radial notches upon its ledge to receive the lateral flanges of the spring for the purpose of securing it within the center.

4. In a watch-case, a case-spring consisting of a curved piece of thin metal having a projection at about its middle for operating on the cover and provided on its ends with laterally-projecting flanges of greater Width of metal than the body portion of the spring, so as to extend above the upper edge of the body portion, in combination with the watclrcase center formed with radial notches upon its upper ledge to receive the upwardly-projecting portions of the lateral flanges of the spring for the purpose of securin g said spring within the center.

In testimony of which invention 1 have hereunto set my hand.

HARRY R. GAUL.

Witnesses:

E. O. CHAPPATTE, H. M. KAIN.