US1116836A - Stop-watch. - Google Patents

Description

v. NIVOIS.

STOP WATCH. APPLIUATION FILED NOV. 21, 1910.

1,1 1 6,836. Patented Nov. 10, 1914,

4 WIT/VESS'ES INVE/VTUI? TH f-I NORRIS PETERS 60.. PHbTaLlTh X. WASHINGTON. D. c

UNITED STATES PATENT OFFICE.

VICTOR NIVOIS, OF NEW YORK, N. Y.

STOP-WATCH.

To all whom it may concern:

Be it known that I, VICTOR Nrvois, a citizen of the United States, and resident of the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Stop-Watches, of which the following is a specification.

My invention relates to stop watches, and particularly to stop watches of the character of that disclosed in Petrillos United States Patent No. 755,313 of March 22, 1904. In watches of this type, the timing hand or so-called split second hand is connected with a driven wheel and with a heart cam; this wheel is adapted to be engaged at times by a driving wheel carried by a shipper arm, while the heart-cam is adapted to be engaged by a fly-back arm to bring the hand back to the initial position. An operating member (moved through the medium of a push-button or the like) controls the position of both arms in such a manner that the first actuation of said member will bring the two wheels in mesh and thus start the timing hand; the next movement of the operating member will stop the hand wherever it happens to be, and a third movement of the operating member will cause the hand to fly back to its initial position.

The object of my invention is to obtain a very compact and efficient arrangement of parts in a stop watch of the general type indicated above, so that a strong, durable and accurately operating construction may be produced at a comparatively low cost.

To this end, my invention consists in certain novel features described and claimed hereinafter.

Reference is to be had to the accompanying drawings, in which- Figure 1 is a face view of the improved mechanism; Fig. 2 is a section on line 22 of Fig. 1, Figs. 3 and i are detail face views of the setting device for controlling the mechanism, and Fig. 5 is a cross section of said device.

In its general features, the stop mechanism is or may be the same as in the Petrillo patent above referred to. I shall therefore give only a brief description of those parts which have been (or may be) left unaltered. The split second hand A is secured rigidly to a shaft A which also carries rigidly the driven wheel A and the heart cam A The latter is adapted to Specification of Letters Patent.

Application filed November 2-1, 1910.

Patented Nov. 10, 1914.

Serial No. 593,383.

be engaged by the inner end of the fly-back arm B pivoted at B by means of a stud entering a socket of the watch plate and pressed toward the cam by a spring C fitted against a shelf B on said arm. The spring also presses the fly-back arm toward the rotary actuating member D which is a star-wheel secured to a shaft D. To this shaft is also secured rigidly a ratchet-wheel D held against turning in one direction by a retaining pawl E, and advanced step by step in the other direction by a pin F projected from an arm F which is guided by a pin G and normally pressed outward by a spring H. A push pin I, engaged by the usual winding arbor I, is adapted to move the arm F and pin F inward when the ordinary winding and setting button (not shown) connected with said arbor is pressed, in the manner customary for the operation of stop-watches. The pin G or the winding pinion I forms a stop to limit the outward movement of the arm F (Fig. 3) while when pressed inward, the arm F turns slightly on its guide pin so as to allow the pin F to reach the position shown in Fig. 4. The ratchet wheel D has three times as many teeth as the actuating starwheel D, so that three operations of the push pin I will be required to bring the projection B of the fly-back arm B back to its initial position shown in Fig. 1. This is in accordance with the wellknown principle of operating stop-watches of the character herein referred to.

My invention relates particularly to the arrangement of the parts connected with the shipper-arm J. One end of this arm is pivoted at J, the other end engages the actuating member or star-wheel D. The intermediate portion is preferably curved to conform more or less to the periphery of the driven wheel A and carries, adjacent thereto, the driving wheel K, to which motion is imparted in any suitable manner; for instance, the shaft K of said wheel may be journaled in the frame in such a way as to be capable of a slight rocking motion also, suflicient to bring the wheels A and K into and out of engagement, while leaving the driving train K L in permanent mesh. Between the driving wheel K and the pivot J, the shipper arm J is formed with a bend J engaged by the rounded end M of a spring M secured to the watch frame at M Preferably a stop pin N is arranged to be engaged by the shipper arm J between the driven wheel K and the point engaged by the spring M, to limit the movement of said arm in the direction in which the spring presses it. A very compact, strong, durable and efiicient arrangement is thus ob tained at a low cost of manufacture.

Various modifications may be made with out departing from the nature of my invention as defined in the appended claim.

I claim:

In a stop-watch, the combination of a driven wheel a shipper arm pivoted to the frame of the watch and provided with a bend adjacent to its pivot, a driving wheel adapted for engagement with said driven wheel and connected with said arm at a Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G.

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