US2915873A - Watch movement controlling directly a central seconds gear - Google Patents

Description

Dec. 8, 1959 L BAMAT 2,915,873

' WATCH MOVEMENT CONTROLLING DIRECTLY A CENTRAL SECONDS GEAR Filed April 27, 1956 2 Sheets-Sheet l Dec. 8, 1959 J. BAMAT v WATCH MOVEMENT coNTRoLLTNG DIRECTLY A CENTRAL SECONDS GEAR Flled April 27, 1956 2 Sheets-Sheet 2 mi y/l//////////////////////////////L ss im l I A United Stat@ Patent O WATCH MOVEMENT CONTROLLING DIRECTLY A CENTRAL SECONDS GEAR Joseph Bamat, Granges, Switzerland, assignor to Amida S.A., Granges, Switzerland, a Swiss firm My invention has for its object a watch movement controlling directly a central seconds gear, said central seconds gear being controlled from the barrel by a first intermediate gear, a second intermediate wheel and a third gear.

According to my invention, this movement includes a gearing with two gears connecting the winding up pinion with the ratchet wheel on the barrel which revolves against normal while the latter controls the cannon wheel through the agency of a friction coupling with two coaxial wheels in a manner such that the transient rotation of the cannon wheel produced by the motion-work during the time-setting operation has no action on the barrel. i

I have illustrated in accompanying drawings by way of example two preferred embodiments of the object of my invention. In said drawings:

Figs. l to 4 relate to the first embodiment and, more specifically, Fig. l is a simplified-view of the movement as seen from the dial side.

Fig. 2 is a cross-section on a larger scale through line II--II of Fig. 1.

Fig. 3 is a diagrammatic plan view of the movement as seen from the bridge side.

Fig. 4 is a cross-section on a larger scale through line lV-IV of Fig. 3.

Fig. 5 is a diagrammatic plan view of the second embodiment, the movement being considered from the dial side.

Fig. 6 is a cross-section on a larger scale through line VI-VI of Fig. 5.

In the example illustrated for the first embodiment, the watch movement comprises a central seconds gear including a toothed wheel 1 Controlled directly by the barrel teeth 2 through the agency of a first intermediate gear 30, 31, a second intermediate gear 32, 33 and a third gear. The toothed wheel 3 of the latter meshes with the toothed wheel 1 on the center seconds gear. These two last wheels 1 and 3 and the center wheel are located in the same plane extending medially between the nishing plate 5 and the surface 4 of the barrel drum facing the latter. By reason of the even number of gears (two intermediate wheels, third wheel and seconds gear) required for driving the seconds hand in the desired direction, the barrel should revolve against normal. For this reason, the pinion p on the winding up means drives the ratchet wheel 6 on the barrel 2-4 through the agency of two transmission wheels 7 and 8 instead of only one.

The teeth 2 on the barrel drive the cannon wheel 10 through the agency of a friction coupling including two concentric superposed wheels 11 and 12. The wheel 11 which is comparatively thin is provided with openings 13 which bestow it with a certain radial elasticity due to which it is held frictionally over the hub of the wheel 12 (Figs. l and 2). Said wheel 11 meshes with the teeth 2 on the barrel. On the other hand, the wheel 12 is fitted on a projection 14 rigidly secured at a short distance from the cannon wheel to the plate 15 and is 2,915,873 Patented Dec. 8, 19,59

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rigid with a motionwork pinion 16 meshing with a toothed wheel 17 formed on the hour wheel pipe H.

For time-setting, the sliding pinion 18 on the winding up stern is caused to engage, under the action of conventional drawing out means 19, a transmission pinion 20 which meshes with the toothed wheel 12 of the friction coupling. Through the action of the latter, the rotation of the cannon wheel 10 produced by the wheel 12 acting as part of the motion work during the time setting has no action on the barrel. 34 designates the pin escape wheel, 35 the balance.

In the second embodiment, the friction coupling bctween the barrel teeth 2 and the pinion on the cannon wheel 21 includes two coaxial toothedV pinions 22 and 23 between which is clamped a frusto-conical slit washer 24. The pinion 21 meshes with a motion work wheel 25 forming with its pinion 26 la speed reducing gear for the hour pipe 27.

It should be remarked that the driven wheel 23 of the friction coupling and the motion work wheel 25 which both engage the cannon wheel 21 are located substantially at the s ame level as the latter and to either side thereof.

The winding up is performed in the same manner as in the preceding case.V The time setting is produced through a single gear 29`controlled by the sliding pinion and meshing with the motion work wheel 25 as illustrated in Fig. 5. The particular structure and arrangement of the intermediate gears 30, 31, 32, 33 have kbeen illustrated for sake of completeness but do not actually form part of the invention as defined in the accompanying claims.

What I claim is:

l. In a watch movement, the combination of a toothed barrel, a finishing plate lying in a plane extending at a short distance above the barrel, a first intermediate gear including a pinion controlled by the barrel and a first wheel, a second intermediate gear controlled by the first wheel, a third wheel controlled by the second intermediate gear, a central seconds wheel controlled by the third wheel, said three wheels being located in a common plane extending between the plane of the finishing plate and the plane passing through the upper surface of the barrel facing the last-mentioned plane, a friction coupling including two coaxial wheels and a common axial carrier for the latter, one of said coaxial wheels meshing with the barrel, a cannon wheel meshing with the second coaxial wheel, an hour wheel and a motion work pinion operatively connecting the cannon wheel with the hour wheel.

2. In a watch movement, the combination of a toothed barrel, a finishing plate lying in a plane extending at a short distance above the barrel, a first intermediate gear including a pinion controlled by the barrel and a first wheel, a second intermediate gear controlled by the first wheel, a third wheel controlled by the second intermediate gear, a central seconds Wheel controlled by the third wheel, said three wheels being located in a common plane extending between the plane of the finishing plate and the plane passing through the upper surface of the barrel facing the last-mentioned plane, a friction coupling including two coaxial wheels and a common axial carrier for the latter, one of said coaxial wheels meshing with the barrel, a cannon Wheel meshing with the second coaxial wheel, an hour wheel, a motion work pinion operatively connecting the cannon Wheel with the hour wheel, winding up means for the barrel, a ratchet wheel coaxially rigid with the barrel, a gearing including. two pinions operatively connecting the winding up means with the ratchet wheel, and time-setting means controlled by the winding up means for the time-setting and adapted to act on the motion work.

3. In a watch movement, the combination of a toothed barrel, a finishing plate lying in a plane extending at a short distance above the barrel, a first intermediate gear including a pinion controlled by the barrel and a first wheel, a second intermediate gear controlled by the first wheel, a third wheel controlled by the second intermediate gear, a central seconds wheel controlled by the third wheel, said three wheels being located in a common plane extending between the plane of the finishing plate and the plane passing through the upper surface of the barrel facing the last-mentioned plane, a friction coupling including two coaxial wheels and a common axial carrier for the latter, one of said coaxial wheels meshing with the barrel, a cannon wheel meshing with the second coaxial wheel,v an hour wheel, a motion work pinion coaxially rigid with the second coaxial wheel of the friction coupling and meshing with the hour wheel and time-setting means engaging said second coaxial wheel.

4. In a watch movement, the combination of a toothed barrel, a finishing plate lying in a plane extending at a short distance above the barrel, a first intermediate gear including a pinion controlled by the barrel and a first Wheel, a second intermediate gear controlled by the first wheel, a third Wheel controlled by the second intermediate gear, a central seconds wheel controlled by the third wheel, said three wheels being located in a common plane extending between the plane of the finishing plate and the plane passing through the upper surface of the barrel facing the last-mentioned plane, a friction coupling including two coaxial wheels and a common axial carrier for the latter, one of said coaxial wheels meshing with the barrel, a cannon wheel meshing with the second coaxial wheel, an hour wheel, a motion work pinion in- 4 cluding two coaxial wheels meshing respectively with the cannon wheel and with the hour wheel, the pinion meshing with the cannon wheel lying in the same plane as the second coaxial wheel meshing with said cannon wheel and time-setting means engaging the motion work.

5. In a watch movement, the combination of a toothed barrel, a finishing plate lying in a plane extending at a short distance above the barrel, a first intermediate gear including a pinion controlled by the barrel and a first wheel, a second intermediate gear controlled by the first wheel, a third wheel controlled by the second intermediate gear, a central seconds wheel controlled by the third wheel, said three wheels being located in a common plane extending between the plane of the finishing plate and the plane passing through the upper surface of the barrel facing the last-mentioned plane, a friction coupling including a common axial carrier and two coaxial wheels frictionally engaging each other, revolubly carried by said carrier and of which one is thin and perforated to show radial elasticity, the first coaxial wheel meshing with the barrel, `a cannon wheel meshing with the second coaxial wheel, an hour wheel and a motion work operatively connecting the cannon wheel with the hour wheel.

References Cited in the file of this patent UNITED STATES PATENTS 819,568 Manthey May 1, 1906 2,618,118 Harris et al. Nov. 18, 1952 2,781,630 Bamat Feb. 19, 1957 FOREIGN PATENTS 125,517 Switzerland Apr. 16, 1928

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