US315829A - perret - Google Patents

Description

(No ModeL) 2 Sheets-Sheet 1.

' P. V. FERRET.

STOP WATCH. No. 315,829. Patented Apr. 14, 1885.

(No Model.)

2 Sheets-Sheet 2. P. V. FERRET.

STOP WATCH.

No. 315,829. Patented Apr. 14, 1885.

Fig. i

UNITED STATES PATENT ()rrrcn.

PAUL VUILLE FERRET, OF OHAUX-DE-FONDS, SWITZERLAND.

STOP-WATCH.

SPECIFICATION forming part of Letters Patent No, 315,829, dated April 14, 1885.

Application filed December 13, 1884. (X0 model.)

To all whom it may concern.-

Be it known that I, PAUL VUILLE FERRET, of Ohauxde-Fonds, Switzerland, have in vented a new and useful Improvement in Stop- WVatches, of which the following is a specification.

My invention is designed as an improvement upon the stop-watch set forth in Letters Patent No. 305,159, granted September 16, 188i, in which patent the cam is made with a series of inclines, which inclines act against a nose upon the operating-lever. There is also a cone bearing against a conical recessed pinion, and said cone is made as one with the central axis or arbor of the watch, and there is a heartcam and a collar against which the stop-lever works. These are separate pieces fastened upon said axis, and the conical recessed pinion revolves upon a sleeve projecting from a plate that is secured upon the main plate of the movement.

In myimprovement the operating-cam has notches and two sets of bearing-surfaces upon its periphery, which surfaces are formed as arcs of circles struck from the center of the cam, and I provide a lever, one end of which operates the heart-cam, and the other end of the lever has a return-bend with an inclined end to be acted upon by the said cam, and I form the heart-cam and cone and collar in one piece, secured by a single pin upon the axis, the cone being on one side of the heart-cam and the collar upon the other, and I make the center wheel and pinion with a cannon-arbor passing through and taking a bearing in the main plate, and projecting as a tubular arbor, around which the conically-recessed pinion is moved continuously by the train of gearingin the watch.

In the accompanying drawings, Figure 1 shows the pieces forming my chronograph mechanism. Fig. 2 is a section, in larger size, through the principal parts of the same. Fig. 3 shows the way in which the complete mechanism is placed in relation to the watchmovement. Fig. 4 is a section through 00 y of Fig. 3, and Fig. 5 shows the cam-wheel. Fig. (Sis a detached section of the levers Q and F.

A is the push-piece, acting upon a springlever, B, which is provided with a pawl or click, 0. By pressing down the push-pieceA the click 0 engages the ratchetwheel D and turns the same and a cam, M, of the especial form shown in larger size in Fig. 5. By a spring-pawl, 0, bearing with its end against the teeth of D, the cam M is held against backward rotation. The levers E and F are fixed to one'another and oscillate upon the stud F. The spring G causes the end of the lever F to move toward the center of the watch as soon as the extremity of E, which leans against the cam M, falls into one of the three notches of the latter. The cam M is provided with three notches, 1, 4, and 7, cutinto the cani,a11d with two series of bearings, 2, 5, and 8, and 3, 6, and 9, upon the periphery of the cam, and formed as arcs of circles struck from the center of the cam. The chronograph-hand S, Fig. 4, is fixed on an axis, R, which turns freely in the hole of the pinion V of the watch-movement. On the same axis, B, there is affixed a heart-cam, P, provided with a conical clutch, P, and with a collar, P, beneath which is received the forked end of the spring-lever Q. The chronograph-pinion 0 turns freely on a tubular arbor upon the cannon of the pinion V, (see Fig. 2,) and is held into the recess in the bridge K by a spring, T, fixed in the head of a screw, U. The pinion O is continuously rotated by the wheel M upon the arbor of the third wheel of the watch; but it gives motion to the chronograph-hand S only when the cone 1? is pressed into the conical recess provided for it in the upper surface of the pinion O. The axis It is constantly pressed upon by the spring J, and as soon as the spring-lever Q, ceases to hold it in the position shown in Fig. 2 the axis R, with heart-cam P, is moved downward toward the pinion O, and the cone 1? passes into the corresponding recess in the pinion O, and the hand S is caused to turn until the push-pin A is again acted upon, and the spring-lever Q raises the cam I? and axis R. Upon the under side of the lever-spring Qthere is a projection, (shown in Fig. 6,) against which the lever F acts to cause said lever Q and heart-cam P to assume the position shown in Figs. 1 and 2.

In Fig. 1 the lever E F is shown in the position in which the extremity of E engages in one of the three notches of cam M, and the le ver F presses against the heart-cam P and causes the hand S to point to twelve o clock. Now, if the push-piece A is acted upon, it

causes the cliclcwheel D to advance one of its nine teeth, and the cam M comes into the position shown in Fig. 3. The extremity ofE lies then against the bearing 2, and lever F is thrown into a position in which the lever Q; is not raised by F, and in which the cone P is pressed into the conical recess of the pinion O by the spring J. The hand S is thereby caused to turn as long as the lever E lies against the bearing 2. By a further action of the pushplece A the ratchet-wheel D is caused again to advance one tooth and the lever E comes to lean against the bearing 3 of calnh The 1ever F is now thrown under the beveled part of the spring-lever Q, which is raised thereby, causing the chronograph-hand to be stopped. If the push-piece A is again acted upon, the lever E 'alls into notch at and lever F presses the heart-cam 1 into the position in which the ohronograplrhand S rests at twelve oclock. The under part of Q is formed so as to be held in its raised position until the lever E is again moved by and rests upon the part 5 of 0am M, when the hand S will be set in motion and the operations repeated.

' I clalm as my invention- 1. The combination, in a stopwatch, with the heart-cam P, the axis R, passing through and secured to the heart-cam, and the plate K, of the pinion O and the wheel and pinion V, having a cannon-arbor passing through the plate K, and a tubular arbor, upon which the pinion O is revolved continuously, and through which the axis R passes, substantially as specilied.

2. In astop-watch, aca1n,M, having notches 1, 4, and 7 and bearing-surfaces in two series, 2, 5, and 8 and 3, 6, and 9, formed as arcs of circles upon the periphery of the cam, in combination with the levers E F upon a pivot, F, and operated by said cam M and the push-piece A, pawl, and ratchet, substantially as specitied.

The combination, in a stopwatch, with the axis it, springs J and Q, and pinion 0, having a conically-reccssed end, of the heartcam 1, collar P, and cone P, said collar and cone being made in one with the hcart'cam and upon opposite sides of the same, substantially as specified.

' PAUL VUILLE PER tET.

Witnesses:

ALB. W'asRHMaNN, M. VENRY.

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