US2898730A - Watch movement including a sweep seconds hand - Google Patents

Description

J. BAMAT Aug. 11, 1959 WATCH MOVEMENT INCLUDING A SWEEP SECONDS HAND Filed Nov. 2, 1956 United States Patent WATCH MOVEMENT VINCLUDING A SWEEP SECONDS HAND Joseph Bamat, Granges, Switzerland, assignor to Amida S.A., Granges, Switzerland, a Swiss lrm Application November 2, 1956, Serial No. 620,042 Claims priority, application Switzerland November 9, 1955 1 Claim. (Cl. 58--59) My invention has for its object a watch movement with a sweep seconds hand and an eccentric large driving wheel. According to my invention, the barrel spring drives the seconds gear carrying the sweep seconds hand through an intermediate wheel, a second gear and a large driving wheel, while said seconds gear extends alone into the gap between an outer surface of the barrel and the train wheel bridge.

I have illustrated by way of example in the accompanying drawings a preferred embodiment of my invention. In said drawings:

Fig. l is a diagrammatic plan View of a watch incorporating my invention as seen from the bridge side.

Fig. 2 is a cross-section thereof through line II-II of Fig. 1.

These drawings illustrate bearings and further details of the bridges, the number, shape and disposition of which form obviously no part of the invention.

The teeth 1 on the barrel 2, the spindle 3 carrying which is pivotally held between a plate 4 and the barrel bridge 5, meshes with an intermediate wheel 6. The latter meshes in its turn with the pinion 7 of the large driving gear, the wheel 8 of the latter driving the pinion 9 of the second gear. The second wheel 10 on the latter drives the pinion 11 of the sweep seconds gear which latter is coaxially rigid with a pin 13 carrying the seconds hand 22. The seconds wheel 12 driving the escape wheel 14 extends alone into the gap between the upper surface of the barrel 2 and the train wheel bridge 15. This arrangement allows obtaining a very thin movement.

v2,898,730 Patented Aug. 11, 1959 2 n The spindles of the intermediate wheel and of the large driving and second gears are revolubly carried between the plate 4 and the train wheel bridge 15. The spindle of the intermediate wheel may however, in a modification, be tted on the one hand between the plate 4 and a bridge provided especially therefor and not illustrated. Y

Obviously, the gearings 6, 7 8, 9-10 and 11-12 will constrain thel seconds wheel to rotate in the same direction as the barrel which, when seen from the bridge 5, rotates anti-clockwise. Its winding requires therefore a transmission including two intermediate wheels.

The teeth on the barrel also control, with the interposition of a friction drive, the wheel of a motion work which is not illustrated, which wheel meshes with the cannon pinion 18 while a pinion coaxially rigid with said motion work wheel controls the hour wheel 20. The cannon pinion spindle is revolubly carried on a socket 21 tted inside the plate.

What I claim is:

In a movement for a watch including a frame, a socket rigidly secured to said frame and a cannon pinion revolubly carried on the latter, the combination of a barrel provided with an annular series of teeth, an intermediate wheel meshing with the barrel teeth, a large driving gear located eccentrically of the movement and controlled by the intermediate wheel, a second gear controlled by the large driving wheel, spindles for said wheel and gears, a train wheel bridge in which is revolubly journaled at least one of said spindles and extending partly over the barrel at a small distance from said barrel to form a gap between said train wheel bridge and the surface of the barrel facing same, a sweep seconds gear controlled by the second gear and including a wheel extending into the gap between the train wheel bridge and the surface of the barrel facing the latter and a seconds hand coaXially rigid with said seconds gear wheel.

References Cited in the le of this patent UNITED STATES PATENTS 442,301 Amaron Dec. 9, 1890 2,728,187 Stamm Dec. 27, 1955

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