US292838A - Watch-winding mechanism - Google Patents

Description

(No Model.)

B. F. MITCHELL.

WATCH WINDING MECHANISM.

Patented Feb. 5, 1884.

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lhairnn STATES Pa .sar

ROBERT F. MITCHELL, OF NEH HAVEN, (10X N Ettlltlfl.

NATCH-WlNDlNG idECHANitfl.

PECIFICATION forming part of Letters Patent No. 292,838, dated February 5, 138

Application filed October-22,1953. (Xo model.)

To all whom it may concern/.-

Be it known that I, ROBERT F. MrrcnnLL, a citizen of the United States of America, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in lVatchfiVinding Devices, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to that class of watchwinding devices known as stem-winding. Stein .winding devices for watches, as con structed prior to my invention, were operated by a rotary movement of a part or the whole of the case-stem, or a radial shaft passing through the stem, either of which operated upon a train of gear in the watch to wind up the mainspring.

The object of this invention is, first, to'provide a winding device which shall be simple and cheap in construction; second, to furnish a device for winding the m'ainspring which shall occupy a very small space in the watch, affording more room for the time-train of the watch; third, to provide a stem-winding de vice which shall not reduce the strength of the case-ste1n by having any of the working parts located in or passing through said ease-stem.

It consists of a stenrwinding device in which the several parts which constitute the device are arranged in such a novel manner that by oscillating the casesten1 to and fro, while holding the watch in a stationary position, the mainspring is wound up.

To enable others to .make and use my improved winding device, I will give a clear and concise detailed description of the same.

Letters of like name and kind refer to like parts in each of the figures.

Figure 1 is a view of a watch having a portion of the rear case removed, exposing to view the position of theparts of the winding device, also the mode of operating the same. Fig. 2 shows a cross-section of the case-ring C, in

Fig. 4, on line at 11,- also showing an edge view of the winding-train of gear and their relative position with the driving-ratchet E. Figs. 3 and 4 are detailed views, fully described here inafter.

A represents the rear case of a watch, having a portion removed to show internal parts which constitute the winding device.

B is the front portion of the case, andis provided with a flange, a. The case-ring (l is provided with the case-stein D, also an inner projection, Z), to which is hinged the pawl c. The small spring (Z is secured to the inner side of the case ring G, and presses upon the pawl 0, holding said pawl o closely upon the ratchet E. The lower portion of the ratchet E is removed in the drawings to show the man ner in which the gear 0 (which is secured to the under side of the ratchet E and both revolving upon the same journal or screw 2') meshes into the toothed periphery of the pinion upon the mainspring barrel or post 1 71 is an inner plate of the watch, upon which are arranged the winding and time trains of the watch. The flange a upon the case B, Fig. 3, is provided with an opening, 7;, in which the inner projection, I), on ease-ring O operates as the case-stein D is oscillated to and fro. The ends of this opening 7; in the flange a serve as a stop to regulate the throw or movement of the case-stem D. I am aware that other means may be used to serve as a stop, but I prefer the mode described because of its cheapness and etficiency. The case-ring C is made in width to correspond with the flange a of the case B, said ring C 'eing adapted, when placed in the position shown in Fig. 1,

to move upon the flange a about the center 01' the case or watch.

The several parts being constructed and arranged as shown and described, the operation of the winding device is as follows, viz: By taking the watch in one hand and with the other hand bringing the casestem D back into the position indicated by the dotted lines in Fig. 1, the pawl c is drawn over the teeth of the atehet E, and the inner projection, b, on the ease-ring C striking against the flange u at the extremity of the opening 7.", prevents the pawl 0 being carried beyond the ratchet E. Having thus drawn the case-stein D into the position of the dotted lines in Fig. l, by carrying the case-stein :t'orward again, the pawl 0 being interlocked in the tooth of the ratchet R, will cause the ratchet and its appurtenant gear 6 to revolve upon the journal or screw 1',

which in turn rotates the mainspring barrel or post 9. The moving of the case-stem D is continued in this manner until the mainspring is wound up.

I have shown the pawl c as operating upon a ratchet-wheel and operating an intermediate gear, because the mainspring can be wound up with a less number of oscillations of the casestem by such arrangement; but the spring can be wound up if the pawl c be made to operate directly upon thepinion 011 the mainspring barrel or post 9.

Having described my invention, what I cl aim as new, and desire to secure by Letters Patent, 1s

1.' A stem-winding device for watches, eonsisting of the case-stem D and case-ring G, being adapted to move upon the case in an arc concentric with the watch-case, said ease-ring 0 being provided with a projection, I), to which journal '5, all arranged to operate substantially as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

Bonner r. MITCHELL.

\Vitncsses:

JOHN F. GOFFEY, Gno. W. Coon.

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