US473675A - Winding mechanism for watches - Google Patents

Description

y Y' (Model.) I 2Sheets-Sheet 1. l

N. SILBERBERG.

WINDING MECHANISM FOR WATCHES.

(Model.) 2 Sheets-Sheet 2. N. SILBBRBBRG.

WINDING MEGHANISM FOR WATCHES.

No. 473,675. Patented Apr. Z6, 1892.

Yip! A. ewmw MM @1f- MV M UNITED STATES NATHAN SILBERBERG,

PATENT OFFICE.

OF JASSY, ROUMANIA.

WINDING MECHANISM FOR WATCHES.

SPECIFICATION forming part of Letters Patent No. 473,675, dated April 26, 1892. Application tiled March 18, 1891. Serial No. 385,564. (Model.) Patented in Switzerland September 13, 1890, No. 2,662.

To a/ZZ whom it may concern.-

Be it known that I, NATHAN SILBERBERG, a subject of the King of Roumania, and a resident of Jassy, Roumania, have invented certain Improvements in Watches, (for which a patent has been granted in Switzerland, N o. 2,662, dated September 13,1890,) ot which the following is a specification.

My invention relates to certain improvements in and relating to the winding mechanism of watches; and its object is to improve the construction of such winding mechanism, whereby overwinding of the watch and consequent deterioration and breakage ot the mainspring or other parts are prevented.

p My invention will be hereinafter fully described, and its novel features carefully defined in the claims.

In order that my invention may be the better understood, I have illustrated in the accompanying drawings my improvements applied to the winding mechanism of a watch, in which- Figure l is an enlarged face View, taken from the rear side of the watch opposite the dial, of the winding mechanism provided with my improvements, the other portions 0f the mechanism of the watch being omitted to avoid confusion; and Fig. 2 is a rear view of the same. Figs. 3, Li, and 5 are detail views taken in three different planes through the mechanism,which will be hereinafter referred to. Fig. 6 is a sectional view taken substantially along line 6 6 in Fig. l.

In the views, A represents the stem of the watch, and B is the pinion secured on the lower end thereof and turning therewith.

B is a toothed gear engaging the teeth of pinion B, and B2 is a second toothed gear in mesh with wheel B. These wheels will of course be of the proper relative dimensions and arrangement as to number of teeth, dac., and pinion B will be by preference ratcheted on the stem A'in an ordinary well-known manner, so that said stem may be rotated back and forward, but will rotate said pinion B in but one direction;

a is a sha-ft or arbor, journaled at its ends f and f2 in bridges D and E, mounted on the respective rear and dial faces of the movement, said arbor extending entirely through the same and provided at its rear end with a square just inside journalf, adapted to ta corresponding square recess in wheel B2, as seen in Fig. 6. At its opposite end said shaft carries a ratchet-wheel m, formed integrally therewith by preference, but which may be secured thereto in the same manner as wheel B2 or in any other manner desired. Thus it will be seen that rotation of wheel B2 by means of stem A through the intermediaries rotates arbor a and ratchet-wheel m, carried thereon.

c is a tubular arbor, loosely mounted on shaft a and provided on its forward end, next wheel m, with asquare j, which receives iirst a small toothed disk and beyond this, next to wheel m, a larger disk Z, preferably of steel. On its opposite end said arbor is provided with a second square c', which iits a corresponding square recess in a ratchet-wheel C, provided with two pawls d and d2, pressed to said wheel by a spring' e, and so set as to stop said wheel at intervals of half a tooth in a well-known manner. The disk Zbears a pawl n, provided with a spring Z', holding it normally in engagement with the teeth of wheel m, the tail n of said pawl being also provided with a spring n2, relatively weaker than spring' Z, the tendency of which is to disengage said pawl from the teeth of ratchetwheel m. This spring n2 is provided with a sharp curve or enlargement n3, which projects slightly beyond the circumference of disk Zin the mannerofacam. Thisconstructionwillbereadily understood by reference to Fig. 4.

F is the barrel-spring and casing as a whole, which is loosely mounted on the tubular arbor c, the spring being pinned fast at its inner end to said arbor and at its outer end to said casing. as clearly seen in Fig. 6. Mounted on the front or dial face of this casing F is a disk k2, provided with five teeth, as seen in Fig. 3, which disk lies, when the part-s are assembled, in the plane of disk on arbor c, the single tooth of which is adapted to engage the teeth of said toothed disk 7a2. The disk k2 is provided on its front side, facing the dial, with a stud or projecting pin b, the purpose of which will be hereinafter explained, and said disk 7a2 is also provided with a' springbrake k', which has a head adapted to slip IOO over and lie between the teeth of said disk as the same is rotated. The shaft a and Wheel m being'set in motion in the direction of the arrow y in Figs. l and 2, the arbor c is set 5/in rotation in the same direction by reason of the engagement of the teeth of wheel m with pawl 'n on disk Z, which disk is set fast to said arbor c. This rotary movement is communicated to the. ratchet-wheel C, which slips past its pawls and to disk x, which is also set fast on said arbor, and tends to wind up the spring within the casing F, whereby the train ofthe watch is moved, said casing remaining during the'winding up of the spring practically stationary by reason of the resistance of the train and mechanism of the watch to the rotary movement. Thus at each revolution of the arbor c the tooth Jcon disk will engage one tooth of disk k2 and rotate said disk, which,being Vmounted on casing F, remains stationary with the latter to the eX- tent of one tooth in the direction of arrow .z in Fig. 3. As the parts are seen inl Figs. 3 and 6,v engagement of said disks may take place ve times, when the parts will have as- -sumed the position seen in Fig. 5-that is, the disk k2 will have been rotated far enough to bring the pin b thereon into engagement with the cam-like bend or enlargement n3 of spring fn?, when said spring will be compressed, and becoming stronger through compression will overbalance spring Z and lift pawl n from engagement with the teeth of wheel m, thereby disengaging arbor c from shaft a and allowing said shaft to rotate freely, communicating no movement to the mainspring through said arbor c. The spring is now fully wound up, and the person winding the watch will immediately notice the difference and cease; but should he continue to turn stem A backward and forward no harm can happen to the mainspring, as there is now no connection between it and said stem. As the casing F rotates in unwinding the spring after the same has been fully wound up, thel pin b will be withdrawn from its position ou the crown of the enlargement n3 in the direction indicated by arrow s in Fig. 5, and when such movement shall have advanced sufficiently the spring may again be wound up. As the casing F bearing disk k2 rotates, one of the teeth of said disk again enffagestooth 'of disk a:

in acontrary direction, and said disk, together with arbor c, being set fast against back rotation by the pawls of ratchet-wheel (lsaid disk 7a2 is rotated in a contrary direction to the extent of one tooth. This takes place tive times, oruntil the spring shall have run down, when the parts will have again assumed the position seen in Figs. 3 and 1l.

It will be readily understood that my invention, as shown in the drawings, is susceptible of considerable modiiication without material .departure from its embodied principles, and therefore I do not wish to limit myself to this particular construction. For instance, the barrel-spring need not be mounted A on shaft a, but may revolve about an entirely different center, movement being communicated by the insertion of other gears, &:c.

Further, my invention is not limited in its application to stem-winding watches, but may be applied with equally beneficial results to key-winding watches. This may be eected by merely omitting the gears on the rear side of the Watchand adding a squared head to shaft a to receive the square of the key.

Having thus described my invention, I claim-- l.. In a winding mechanism for watches, the combination, with the shaft a, rotatively mounted and ratcheted in the movementplates, of the mainspring rotatively mounted on said shaft, the ratchet-wheel and vits pawl for communicating the movement of shaft a to the spring, and means, substantiallyas described, for disengaging said spring and shaft, whereby overwindingor straining of the mainspring is prevented.

2. In a winding mechanism for watches, the combination, with the `shaft a, rotatively mounted and ratcheted in the movement- IOO stantially as described, for rotating disk k2 and pressingsaid projection against the tail of pawl n, whereby said pawl is lifted from engagement with the teeth of wheel m, and said arbor c and shaft a disengagedsubstan tially as and for the purposes set forth.

3. In a winding mechanism for watches, the combination, with the shaft a, rotatively IIO mounted and ratcheted in the movementplates, of the arbor c, bearing the mainspring, land its easing loosely mounted on said shaft and ratcheted to the movementplates, the ratchet-wheel m on shaft a, its pawl n, mounted on arbor c and provided with the springs l and n2, said spring 'n2 provided with the enlargement n, the disk 7a2, rotatively mounted on the casing and provided with teeth, and ay pin b, adapted as said disk is I'rotated to press against the spring n2, and the disk x, fixed on arbor c and provided with a tooth adapted to engage the teeth of disk k2, all arranged to operate substantially as and for the purposes Set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

NATI-IAN SILBERBERG.

Witnesses:

BENNo SILBERBERG, HENRY H. LABHART.

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