US919764A - Stem winding and setting watch. - Google Patents

Description

W. B. PORTER.

STEM WINDING AND SETTING WATCH.

APPLICATION FILED SEPT.30,1908.

Patented Apr. 27, 1909.

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UNITED s'rArns Parana? onrrcn.

WILSON E. PORTER, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO NEW HAVEN CLOCK CO., OF NEW HAVEN, CONNECTICUT, A CORPORATION.

STEM WINDIN G AND SETTING WATCH.

To all whom it may concern:

Be it known that I, l hrsow E. Ponrnn, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Stem-Viinding and StemSetting atches; and I do hereby declare the following, when taken in connection with the accompanying lrawings and the numerals of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in

Figure 1 a view in rear elevation of a watch. constructed in accordance with my invention, with the back-cap removed. Fig. 2 a broken view in inside elevation of the back movement-plate, the bridge being indicated by broken lines. Fig. 3 a broken edge view showing the dog in its relation to the main winding-wheel. Fig. 4 a broken plan view of the dog and its shaft. Fig. 5 a detached view in elevation of the dog.

My invention relates to an improvement in stem-winding and stem-setting watches, the object being to provide simple, durable and reliable means for ireventing the mainspring from being wound too tight.

With these ends in view my invention consists in a stem-winding and stem-setting watch having certain details of construction and combinations of parts as will be hereinafter described and pointed out in the claims.

In carrying out my invention as herein shown, I employ a disk-like dog 2 formed with a stop lug 3 and a relaxing tooth 4. located adjacent to the near end, as I may say, f the lug 3. The stop dog is mounted upon rock shaft iournaled at one end in the front movement-plate 6 and at its opposite end in a bridge or supplemental plate 7 held in place by two of the screws 8 which secure the back movement-plate 9 to two of the pillars 10 of the movement. In other words, two of the screws which are em ployed to fasten the back movement-plate to the pillars, are also employed for securing the bridge in place. v i hen in place the said bridge rests upon the back or outer face of the said back-movement plate.

The dog 2 is located so that the main winding-wheel 11 as it is turned in winding, rides over the lug 3 and tooth 4 of the dog which is returned to its normal position every time a tooth of the said wheel snaps Specification of Letters Patent.

Application filed September 30, 1908.

Patented April 27, 1909.

Serial No. 455,507.

over it, by a spring 12 encircling the shaft 5 at one end, and at its other end wound about one of the pillars 10 of the movement. This spring however, may be constructed and arranged in a variety of ways as long as it is adapted to cause the dog to recover after a tooth of the winding-wheel 11. has passed over it. The said main winding-wheel 11 is meshed into by an intermediate winding wheel 13 constantly engaged by a winding pinion 14 fixed upon the inner end of a rotatable and longitudinally movable stem 15 located within the pendant 16 and furnished at its outer end with a winding crown 17. However the particular means employed for rotating the main win ding-wheel has nothing to do with my present invention.

One end of the main-spring which is not shown, is connected with the main windingwhecl 1.1, while its opposite end is connected with the time-wheel 19 which meshes into the center pinion (not shown) of the time-train. It will be understood that in winding the mainspring, the teeth of the wheel 1 1 ride over the tooth 1 of the dog 2 and effect a constant oscillation of the dog in conjunction with the spring 12 before mentioned.

When winding pressure is taken off the crown 17, the main-spring immediately asserts itself and turns the wheel 11 in the revcrse direct-ion, whereby the tooth of the said wheel which is at the time in front of the relaxing tooth 4 of the dog 2, ii'ninediately turns the dog from left to right, and thus jams the lug 3 of the dog into the adjacent teeth of the wheel so as to lock and hold the wheelagainst further reverse rotation. This locking engagement oi the lug 3 of the dog 2 with the teeth of the wheel 11 does not, however, take place until after the said wheel has been reversely rotated for a short distancefor a distance sufficient to relax the tension upon the winding spring to the degree required for preventing it from breaking. This construction also avoids the over-banking, as it is termed, of the balancewheel of the watch, resulting from an excess of pressure upon the time-train due to overwinding the mainspring and causing the movement to run too fast until this over-pressure has spent itself. By employing two or more relaxing teeth 1 instead of one, as shown, the lug 3 would be carried farther out of range of the teeth of the wheel 11 and consequently would permit a greater reverse rotation of the same before its reengagement therewith and arrest thereof, whereby a greater relaxation of the winding spring would be effected. However I have found the employment of one relaxing tooth 4 close to the near end of the lug 3 sufiicient to prevent over-winding.

As shown, the disk-like dog 2 is formed with a narrow radial slot 20 arranged to be exposed through a cut 21 in the mo vement plate 9 so that at any time that it is desired to let the spring down any convenient instrument, such as the end of a small screw-driver, might be inserted into the slot 20 and the dog turned against the tension of its spring 12 so as to disengage its lug 3 and tooth 4 from the teeth of the main winding wheel 11 and per mit the same to be rev ersely rotated until the spring has been unwound.

It will be observed that the back movement-plate is cut away under the bridge or supplemental plate 7 so as to permit the main winding-wheel 11 and the dog 2 to be located in the plane of the back movementplate.

I claim 1. In a stem-winding and stem-setting watch, the combination with the front and back movement-plates thereof, of a bridge bearing upon the back or outer face of the said back movement-plate, a main windingwheel, a rock-shaft having its respective ends journaled in the said bridge and front move ment-plate, a spring-actuated oscillating dog mounted upon the said rock-shaft and lo cated between the said front movementplate and bridge in position to bear against the inner face of the said bridge, and the said dog being formed with a stop-lug and a relaxing-tooth for coaction with the teeth of the said wheel.

2. In a stem-winding and stem-setting watch, the combination with the movementplates thereof, of a main winding wheel, a spring-actuated oscillating disk-like dog located between the said plates and provided with a stop-lug and a relaxing-tooth and formed with an operating slot for the reception of an instrument by means of which the dog may be manually operated for the reverse rotation of the main winding-wheel, and a shaft upon which the dog is mounted, the ends of the said shaft being carried by the respective movement plates.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

W'ILSON E. PORTER. Witnesses GEORGE D. SEYMOUR, OLA-RA L. WEED.

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