US1041335A - Watch-movement. - Google Patents

Description

G. NUTTING.

WATCH MOVEMENT. APPLICATION rum) JULY 27, 1912.

1,041,335. Patented 0ct.15, 1912.

IIIII Ill ATTORNEY in watch movements,

art, these ewels extremely vent its accidental UNITED STATES PATENT orrroa.

WATCH CASE COMPANY, PENNSYLVANIA.

-- GRANVILLE NUTTING, O1 JERSEY CITY, NEW JERSEY, ASSIGNOB TO THE KEYSTONE OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF WATCH-MOVEMENT.

Specification of Letters ratent.

Patented Oct. 15,1912.

Application filed July 27, 1912. Serial No. 711,880..

5 and State of New Jersey, have made and invented certain new and useful Improvements in Watch-Movements, of which the I following is a specification.

My invention relates to an improvement and more particularly to a shell 'or'bushin made of metal, to be used as a substitute for the upper and lower balance hole jewels. As is well known to manufacturers and others familiar with the add considerably to the cost of a watch movement, in that, in addition to the first cost of the stone, it is the usual practice tomount them in a bushing which latter must be accurately made and 20 fitted to the balance cock dome, and at the o posite end of the balance staff into the dial-plate of the movement. These bushings in which the jewels are mounted are made slightly larger than the holes or open- 25 ings into which they are fitted, the bushings being then crowded into their places friction-tight. If the bushings are made slightly too large, and it is attempted to force them into place, the jewel, which is thin, is invariably cracked or broken,'and if the'bushing be made too small it is rendered useless, or, in other instances, requires the spreading thereof in order to accurately fit it into place'to predisengagement from ,the dome or dial-plate. Furthermore, these upper and lower balance jewels bein so thin, become broken not only in assem ling the parts of the movement, but many are broken 40 during transportation.

The object of my invention is to avoid the use of these expensive jewels and to provlde 'a substitute therefor which, being made of.

metal, avoids all danger of injury thereto durin transportation or in assembling the severa parts of the watch,movement,-and which while equally well performing all the functions of a jewel will effect a great saving in the cost of the movement. This object I accomplish by means of a cup-shaped shell or bushing, struck up in its finished form at one operation in a suitable die from thin sheet metal, preferably steel, or what is commonlyknown as white metal, this shell being illustrated in the accompanying drawings, in which Figure 1 is a view in section of a part of a watch movement showing a part of a balance cock and dial-plate, and a balance stafi' mounted therein; Fig. 2 is a detached perspective view of my improved shell showing the interior thereof, and Fig. 3 a like view showing the under side'thereof.

Referring to the drawings,.A represents a part of a balance cock, and Ba part of the dial-plate of a watch movement, a balance staff C bein balance cock A is fitted the dome D surrounded by the index finger ring E provided with the index finger F. In the dome D is fitted the cock end stone end stone setting H, and in the dial-plate B is fitted the lower end stone I mounted in the lowerjend stone setting J, all of the above parts being made and assembled in the usual way. Instead, however, of employing the usual upper and lower balance jewels, I substitute therefor a bushing K made of thin sheet metal and struck up at one operatio-n'in a suitable-die, the bushing, after being formed or shaped, being then hardened or tempered. This bushing, as clearly illustrated in the drawing, is pro vided with a conical-shaped center L, the end of which is rovided with a hole or opening M throu which passes the upper or lower end of the balance staff C, as illus-. trated in Fig. 1, one end of the balance staff bearing against the cock end stone G,

and the opposite end against the lower end stone 1. The edge of the bushing K is bent or turned to form the flange N ofapproximately the same height as the'cone L, the diameter of the bushing or shell being such as to have it tightly and snugly fit 1n the opening whichit is employed. This substitute for G mounted in thein the balance cock or dial-plate inmounted therein. To the the upper andlower balance jewel .is superior in many respects to the stone usually employed, in that my experience has taught me in fitting many thousands of watches with the same thatit costs approximately about one-tenth as much as the ordinary jewel" used for more, made of tempered metal, the shell does not have to be made with such extreme acas the surrounding flange N contains curacy,

a certain amount of reslliency tending to the same" purpose. Furthertightly hold it in its proper position; Again, the space between the upper and lower balance jewels and the end stones is so slight that but a small quantity of oil is held therein, whereas by the use of the steel shell a. much greater space is afiorded for the oil and permitting the movement to run much longer without the necessity of supplying additional oil. Again, the upturned flange also afiords a rest or seat for the setting of theend stone, and all loss heretofore occurring in the breaking of the thin jewels, either while assembling the parts or during transportation, is avoided,

What I claim is l. A shell, for use .as a substitute for the balance jewels in. a watch movement, made Loenssa of tempered metal and formed with aperforated center, the outer edge being formed with an upwardly-turned flange forming a setting for the end stone.

2. A shell,for use as a substitute for the balance jewels in. a watch movement, made of metal, and formed with a perforated cone-shaped center, the outer edge thereof being flanged to provide a setting for the

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