|Publication number||US235794 A|
|Publication date||Dec 21, 1880|
|Filing date||Apr 5, 1880|
|Publication number||US 235794 A, US 235794A, US-A-235794, US235794 A, US235794A|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
C. H. MBYLAN.
No. 235,794. Patented Dec. 21,1880.
.FEIERS. PNOQ-LITMUGRAPHER, WASHINGTON, n, C.
UNITED STATES i CHARLES H. MEYLAN, OF NEW YORK, N. Y
SPECIFICATION forming part of Letters Patent No. 235,794, dated December 21, 1880, Application filed April 5, 1880. (No model.)
To all whom t may concern Be it known that I, CHARLES H. MEYLAN, of the city and State of New York, have invented an Improvementin Watches, of which the following is a specification.
Watches have been made with an independent second-hand and stopping, starting, and iiy-back mechanism, usually called chronographs.77 In these watches the second-hand is upon a tubular arbor that surrounds the arbor of the minute-hand, and the wheel that actuates theindependentsecond-hand is necessarily between the gearing that connects from the minute-hand to the hour-hand. Hence the hour-gear has to be carried by a bridge, and the pinion that operates the same has to pass by the chronograph-wheel and into an opening in the bridge, and there is considerable space occupied in the watch. The distance between the face and the plate in ordinary watches is not sufcient for the reception of this kind ot` chronograph-movements.
Myinvcntion is made for siinplit'yingthe construction ot' the parts and arranging them in such a mannerthatthe means for actuating the chronograph second-hand will occupy but little more room than that usuallyfound between the dial and watch plate in ordinary watches, so that the independent second-hands can be applied with but little cost to ordinary watches. I accomplish these objects by applying1 the drivin g-wheel of the independent second-hand above the gearing that connects the hour and minute hands, and between the same and the face, and introducing the independent secondhand between the hour-hand and the face, so that the space occupied by the mechanism that drives the independent second-hand is only the thickness of the driving-wheel and heartshaped cam, and in most watches the wheels connecting the hour and minute hand can be recessed into the plate sufficiently to allow ot' the introduction of said wheel and cam neXt to the back of the face without disturbing' the other parts of the watch or the face.
In the drawings, Figure l represents the parts with the fa ce of the Watch removed. Fig. 2 is a sectional view of the wheels that connect the hands and of the hands in their relation to the face, and Fig. 3 is a separate view of the bearingfor the intermediate wheel that communicates motion to the independent secondhand. These parts are all of a magnified size.
The watch-plate (t, arbor b oi' the secondhand, the wheels d and c, that connect the hour and minute hands, the arborfof the minute hand, and the tubular arbor g ot the hourhand, are all of the usual character.
The push-lever h acts upon the spring-pawl t' to rotate the cam-wheel 7:, and the cams on this wheel 7c operate to swing the arin l, that carries the intermediate wheel, m, and move it out ofcontact with the chronograph-wheel u, or allow the spring 2 to press it into contact with said wheel u, and the cams also actnate the brake-lever o to move it from the wheel a, or bring it into contact with the edge thereof, and the cams also operate the lever s, that acts against the heart-cam to bring the independent second-hands around to 12 on the dial. One push of the lever h connects m and a, so that the hand t starts off and denotes seconds, the second push separates m and n and applies the brake-lever 0 to stop the independent second-hand, and the third push on the lever h removes the brake and acts upon the heartcam to return theindependent second-hand to l2. These parts act in a similar manner to the chronograph-movenients heretofore made.
My peculiar improvement relates, as aforesaid, to the wheela and heart-cani o", surrrounding the tubular arbor ot' the hour-hand, so as to revolve around the arbor of the hour-hand, and provided with a tubular arbor to carry the second-hand t between the hour-hand and the face, and thereby render unnecessary the bridges and complicated gearing and costly construction heretofore resorted to in watches of this character.
The intermediate wheel, m, and arm l swing upon a pivot pin, o', and the teeth of the wheels m, a, and u being very tine, it is difticult to adjust the pivot ot' the arm Z so as to make the teeth of the wheels m and n gear together properly. To provide for this I make use of a bushing, 02, in the watch-plate, the same having in it an eccentric hole, as seen in Fig. 3, so that by turning this bushing the pivot-hole therein will be made to approach toward or recede from the arbor of the second- IOO hand, and thus bring;` the gears properly together. In swinging` the arm l to brin g' the wheel m into Contact with the wheel n the motion is at right angles, or nearly so, to a line extending from the pivot o to the secondsarbor. Hence the teeth of the wheels fm and u remain properly in gear When the bushing has been adjusted..
claim as my invention- 1. In a chronograph, the Wheel u, provided with a tubular arbor surrounding the arbor of the hour-hand and having the independent second-h an d t, th at revolves between the hourlland and the dial, and said Wheel u beingbetween the back of the dial and the Wheels that connect the minute and hour hands7 in combi- CHARLES H. MEYLAN.
Witnesses GEO. T. PINGKNEY, WILLIAM G. Mo'rtr.
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