US759303A - Stop-watch. - Google Patents

Description

PATENTED MAY 10, 1904.

J. L. NEWELL.

STOP WATCH.

APPLIOATION'I'ILBD APR. 27. 1903.

III I Patented May 10, 1904.

UNITED STATES PATENT OFFICE.

JAMES L.. NEWELL, OF SAGINAW, MICHIGAN.

STOP-WATCH.

SPECIFICATION forming part of LettersiPatent No. 759,303, dated May 10, 1904.

Application filed April 27, 1903.

T 0 all whom it nut/y concern.-

Be it known that I,- JAMES L. NEWELL, a citizen of the United States, residing at Saginaw, in the county of Saginaw and State of Michigan, have invented a new and useful Improvement in Stop-Watches or Horse-Timers, of which the following is a specification.

The object of my invention is to provide a simple, inexpensive, and accurate stop-watch;

The invention consists in the novel construction and combination of the several parts, whereby the sweep seconds-hand may be returned to zero or its starting-point without the use of clutches ordisengaging any of the train of wheels, as will hereinafter be fully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a plan view of my improved stopwatch, showing the back side of the front plate, the back plate being removed with the standard train of a watchmovement shown in broken lines and my improvements in solid lines. Fig. 2 is a side view of the spring 6. Fig. 3 is a side view, partly sectional, of the sweep seconds-post and bearings. Fig. 4 is a plan view of sweep seconds-post, showing heart-cam k, friction-cap 7L, and gear-wheel g.

a is the front plate of my improved watch, having the long central bearing 6, through which the post 0 of the sweep seconds-hand (1 projects. The bottom of the post 0 is enlarged to form the bearing 6, which rides upon the mainspring-barrel f, thereby retaining the sweep seconds-post in its bearing 6.

g is a gear-wheel revolubly connected to the sweep seconds-post 0 by the friction-caps It and '5.

k is a heart-cam common to stop-watches, which is secured to post 0 by a driving fit, so as to bear upon the friction-cap la, and impose a suitable pressure thereon.

Meshing with the gear-wheel g is a gearwheel Z, which is secured to the arbor of the fourth wheel of any standard American watchmovement, whichI prefer to arrange as shown in Fig. 1 by broken lines.

Fulcrumed to the front plate a at 9% is a lever Serial Nd. 154,592. (No model.)

A 0, withthe arms 12 and g at one end and the other end forming an arm 0*, extending through and terminating in a button 1* on the outside of the plate a, by means of which lever 0 is operated.

tis a spring secured by one end it to the front plate a for holding the arm 7, by which the lever 0 is held in its position. Near the middle of the spring 25 is a corrugation forming the inclined shoulder t on the free side and with the fixed end in the notch t" on the other side.

4) is a light spring secured to the front plate a and bearing against the lever 0, so as to always return and hold the arm 1 against the shoulder t of spring 6, but not strong enough to force it past the same.

The arm 19 of lever 0 terminates in a point p and is adapted to engage the heart-cam k in order to return the sweep-hand d to zero. The arm q terminates in a fine spring end q, having the guide g at its end. The end (1 is proportioned and so formed as to engage a balance-wheel arbor s of the watch-movement, and thereby stops same while the lever 0 is in the position as shown in Fig. 1, and while the arm 10 engages the heart-cam.

The operation is as follows: To time the speed of anything, the first operation is to place the sweep seconds-hand d to its position at zero, which is done by the operatorpressing the button r of the lever 0 in the direction of the arrow, Fig. 1, causing the point p of the arm p to engage the heart-cam is, forcing the same and with it the sweep secondspost 0 and hand cl to the zero position, the friction-caps h and 2' allowing the arbor to revolve independent of the gear-wheel g and the rest of the movement. At thesametime the spring end q of arm q engages the balancewheel arbor s, stopping the watch-movement. By now letting go of button r the levero will fly back by pressure of the spring 2; and lie against the shoulder t of spring 6. The arm 19 will now be disengaged from the heart-cam,

but the spring end will still be in contact with the balance-wheel arbor s to stop the watchmovement and will be in the position shown in Fig. 1. The movement may now be started by pressing the button 0* in the opposite direction of the arrow, overcoming the resistance of the spring 2? and pressing the arm of lever 0 by the shoulder t into the notch 23 of spring 6. To stop the movement, the button 0' is again pushed back in the direction of the arrow into the position shown in Fig. 1, so that the end of arm 9 of lever 0 engages the balance-wheel arbor s, but the arm p does not engage the heart-cam k.

WVhat I claim is 1. In a stop-watch the combination with a balance-wheel arbor, and a seconds-p0st; a heart-cam rigidly secured to said post; of a lever consisting of three arms, one of which projects outside of the case for the purpose of operating said lever, the other two arms being so relatively placed that one of said arms will engage said balance-wheel arbor and thereby stop the movement of same and continue to hold it so during the time that the other arm engages the aforesaid heart-cam on the sweep seconds-post in order to return same to its zero position substantially as shown and described.

2. In combination in a watch of the class described, a sweep seconds-post, a gear-wheel revolubly mounted thereon; friction-caps rigidly secured to said sweep seconds-postand bearing upon said gear-wheel; a heart-cam rigidly secured to said post; a balance-wheel arbor; .and a lever consisting of the arm 1- extending outside of the watch-case for the purpose of operating same; the arm (1 adapted to engage the said balance-wheel arbor and stop the same during the time that the arm 7) engages the said heart-cam Z in order to return the same to its zero position substantially as shown and described.

3. In combination in a watch of the class described. a sweep seconds-post; a heart-cam secured to said post; a balance-wheel arbor; a lever 0 having an arm 7) adapted to engage said heart-cam and return same to zero position, a second arm 9 with flexible end 1 adapted to engage the said balance-wheel arbor and stop the watch-movement during the above operation, and a third arm for operating said lever 0; together with a yielding stop t for the purpose of holding the arms 1* in the different positions substantially as shown and described.

In testimony whereof I have signed my name to this specification in the presence of two su bscribing witnesses.

JAMES L. N EWELL. itnesses:

WV. J. LAMSON, C. H. STEPHENS.

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