US312668A - Teenths to geoege judge - Google Patents

Description

' (No Model.)

W. H. SNELSON PULLEY SHBAVE.

Patented VFeb.?24, 1885.

ll'NrTnn STATES WILLIAM` II. sNLLsoN, or cHIoAGo,

PATnNT Ormea.

ILLINOIS, ASSIGNOR-OF SEVEN-SIX- TEENTHS TO GEORGE JUDGE, OF SAME PLAGE.

SPECIFICATION forming part of Letters Patent No. 312,668, dated February 24, 1885.

n Applicatioulcd July 1, 1854. (No model.)

To @ZZ whom. t may concern..-

Be it known that I, WILLIAM H. SNELsoN, of Chicago, county of Cook, andStateof Illinois, have invented certain' new and useful Improvements in a Pulley-Sheave, of which the following is a full, clear, and exact description, that will enable others to make and use the saine, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates more especially to improvements in that class vof sheaves having a grooved periphery for the purpose of adapting the same to carry the wire rope employed in the cable traction system for moving streetcars. It is also obvious that a' pulley or sheave of this character may be used for various purposes.

-The object is to provide a carrying pulley or sheave that will reduce the f'riction and lessen the wear on both the cable and sheave, and also prevent the face or cable-bearing surface of sheave being affected by corrosion, as the sheaves used in street-car service are usually placed below the level -of the ground surface, and are as a matter of course more or less in the water.

The nature of Athis invention consists in forming the body of the pulley or sheave of glass, which is properly supported and clamped between metallic anges. It also consists of certain novel features in the construction and manner of securing the different parts together, as will be hereinafter more fully set forth in detail.

Figure 1 is a side elevation of a pulley or sheave embodying myimproved features, Eig. 2, a partial transverse section of the same. Figs. 3, 4, and 5 are modifications.

Referring to the drawings, AA represent the inclosing danges or sides, B the arms, C the hub, and D the glass body. The body D is composed of glass, and ordinarily has beveled sides, as shown in Fig. 2, the broadest or base part resting on the annular rim a,which is cast on the ends of the spider-arms B, together' with the one side flange, A, the companion flange, A', being formed independent and detachably secured in relation to the other parts. Theinclosing-tlanges A A are beveled on the inner faces to correspond to the body D. The body D is provided on the periphery with the annular groove a', for the reception of the cable. For small sheaves the glass body or center will usually be formed as a Vwhole; but for large sheaves or pulleys practical working may require the same to be prepared in segmental sections. This form of construction will also facilitate repairs and be more economical, asa fractured segment can be convenientlyreplaced by another without having to replace the body as a whole.

The detachable or loose flange Ais secured in position with relation to the other parts by means of the series of screw-bolts E, which pass through the glass body, the threaded ends engaging with the correspondingly-threaded apertures al in the iiange A', while the opposite or headed ends are countersunk in the companion flange, A. By this arrangement all the parts are securely and firmly clamped together, leaving no projecting bolt ends or nuts to be in the way, and also readily permitting of the structure being taken apart for repairs. The flange A is also provided with the annulargroove a3, which receives and engages with the edge of the rim a, and serves to assist in strengthening and in retaining these parts in their proper relative position.

The series oi' openings c1 in the iianges A A provide means for keeping the sheaves in balance by simply filling the saine with lead or some suitable plastic substance that is easily inserted or removed, as may be required. These openings are gradually contracted outward from the innersides of the iianges, as shown 4in Fig. 3, whereby the filling is more surely retained.

- The angular extended ledges b b on the flanges A A serve to guard against the liability of the cable getting off the sheaves. The contacting surfaces ol' the glass and metal will be covered with white lead or some similar substance, for the purpose of forming tight joints and excluding the moisture.

rlhe modification, Fig. 3, shows a double pulley or sheave, the glass body being provided with two grooves, the metallic flanges or inclosing sides having independent hubs. In this case the contacting surfaces of the flanges and glass body are straight instead of beveled, and are clamped together by screw- IOO v composition.

bolts, as already described. The glass body is provided on each side with the annular projecting bead d, which engages with corresponding grooves inthe inclosing-langes.

Fig. 4 shotvs the glass body with annular shoulders d,the inclosing-iianges having beads engaging with said shoulders for the purpose of assisting in retaining these parts together.

Fig. 5 shows a sheave or pulley wholly of glass, which may be rigidly secured to its shaft by the use of sulphur or other suitable cement It' the pulley is required to rotate loosely on a stationary shaft, the eye through the pulley should be bushed with Babbitt metal or other material that will provide a suitable bearing. This pulley is provided on its periphery or face with the usual carrying-groove, the face sloping inward toward said groove, so that the cable will not be so likely tojurnp off. This pulley is also provided on each side With the annular grooves di di, which in turn are provided at regular intervals with the cupped-out cavities or recesses di. (Indicated by the dotted lines.)` These cavities may be of any particular shape7 and are designed to receive and hold some substance to retain the pulley in proper balance.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. A pulley-sheave having a body and bearing-face composed Wholly of glass7 substantially as described.

2. A pulley-sheave consisting of the hub C, the arms B, the rim a, the rigid iiange A, the glass body D, the detachable iiange A', provided with the annular groove a, and the clamping screw-bolts E, substantially as described.

3. A pulley-sheave having the sides or' .to

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