US515861A - Art of making duplex escapement-wheels - Google Patents

Description

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H. J. EISEN. ART 0E MAKING DUPLEX ESGAEEMENT WHEELS.

No, 515,861. Patented Mar. .6, 1894.

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. Unirse Sterns 'Ferrater @einen HERMAN JGSEPH EISEN, OF BROOKLYN, NEW YORK, ASSIGNOR TO EDNVARD A. LOGKE, OF BROOKLINE, MASSACHUSETTS.

ART OF MAKING DUPLEX ESCAPEMENT-WHEELS.

f l I SPECIFICATION forming part of Letters Patent No. 515,861, dated March 6, 1894.

represin ned June 2s, lees.

Serial No. 479,067. (No model.)

hand, have of necessity `been made of soft brass, so as to provide for die-forming the impulse teeth or for bending them to bring them into their different planes as compared with the spur teeth or long teeth. Conse-` quently such scape-wheels "have had to be' j made comparatively heavy and of excessive inertia in order that the delicate long teeth might resist their contacts with the balance- "arbor, and are peculiarly liable to become bent in the hands of watch-makers so as to become inoperative.

machinery, and in a certain novel portion otV y said process, as hereinafter set forth and claimed.

A sheet of drawings accompanies this specication as part thereof.

Figure 1 of the drawings comprises a face view and a diametric section of a circular.

blank produced by lathe-turnin g, illustrating the first stage of said process. Fig. 2 is a face view illustrating its second stage. Fig. 3 is a face view, `with appended representations of milling cutters, in dotted lines, illustrating the third and fourth stages of the process;

. and Fig. i :is a face view of the nished pro duct.

Like letters and numbers refer to like parts in all the figures.

The blank A, Fig. 1, is produced by latheturning, and consists of a flat circular disk having a central hub-projection l and a concentric annular ange 2, preferably on one' and the saine side of the body of the disk,

which extends beyond said annular flange in the form ota wide margin 3. The blank is next passed to a punch and die of the pattern indicated by Fig.`2, which represents their product. The blank as thus roughed out has the spokes or cross 4 of the final product B, Fig. 4, together with its rinr, except the peripheral surfaces of the latter, and also the long teeth Gin rough; the latter being formed from said margin 3 Fig. 1, by removing the interdental portions thereof, while said cross and rim are formed by punching out portions of the body of the disk, Fig. 1, between said hub projection 1 and annular flange 2. The latter are left untouched by the punch and die. Anurnberof the roughed out blanks, Fig. 2, are next assembled in a stack, and subjected to the action of one or more suitable milling cutters C, Fig. 3, by which the long teeth 6 are shaped as to their lateral edges, and the intermediate impulse teeth 7 are formed or completed at one and the same progressive milling operation; said impulse teeth being cut from that portion of the blank Fig. 1 which is provided with said annular flange 2, so as to project above the plane ot said long teeth to a second plane, as

'required in duplex escapeinents, without any displacement ot the metal of the teeth. Functionless portions of said annular flange 2 remain on the long teeth 6, as at 2 in Fig. 3. To remove these portions, each scape-wheel is next subjected to the action of an annular 1 milling cutter, C2, Fig. 3. This cutter removes said tunctionless portions of the iiange 2,r`r0m two of the long teeth 6 simultaneously, as illustrated in Fig. 3, and thus rapidly completes the teeth of the scape-wheel. The bore 9 Fig. et of its yhub 1 is next drilled, which completes the final product, as represented by Fig. fi.

The product is distinguished from other machine-made scape-wheels for duplex escapements in'that it is of light weight and'of hard metal as aforesaid, and furthermore by having impulse teeth which project bodily from the periphery of the rim of the wheel and extend upward to aplane above that of the long teeth by being of extra thickness or width from bottom to top. The scape-wheel may be thus made with a greater or less nurn- IOO berof teeth as preferred, and other like modifications will suggest themselves to those skilled in the art.

I do not claim herein the aforesaid product of my process of manufacture, but claim the same in another specification of even date herewith, in favor of which it is hereby disclalmed. I refer to my specification forming part of an application for patent, filed J une 28, 1893, Serial No. 479,068.

Having thus described the said improvement, I claim as my invention and desire to patent under this specificationl. The method of making hard-metal scapewheels for duplex escapements which consists in providing a blank with a hub-projection an annular flange and a wide margin external to said flange by turning, producing the cross and rim, except as regards the peripheral surfaces of the latter, and also roughing said flange by a turning operation, roughing out the long teeth from said margin by punching, and cutting all the teeth in the stack by -cuts extending inward through said flange,

substantially as hereinbefore specified.

HERMAN JOSEPH EISEN.

Witnesses:

Taos. D. RAMBAUT, ALEX. LEHMAN.

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