US664996A - Expansion-pulley. - Google Patents

Description

N6. 664,966. j Patnted 1an. .1', |901.

' n.6. Evi-:nerr I EXPANSIUN P ULLEY.

f (Application led July 6, 1900.) (No Model.) 2 Sheets-Sheet l.

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No. 664,996. j Y Patented lan. l, l90l.

' A.S. EVERETT.

EXPANSION PULLEY.

(ppnention med July e, 1900.)

(No Model.)

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UNITED STATES PATENT OFFICE.

ARTHUR S. EvERE'rT, oF LAWRENCE, MASSACHUSETTS.

vEXPANSION-PULLIY.

SPECIFICATION forming part of Letters Patent No. 664,996, dated January 1, 1901.

Application iled July 6, 1900.

To all whom t may concern.

Be it known that I, ARTER S. EVERETT, a citizen of the United States, residing at Lawrence, in the county of Essex and State of Massachusetts, have inventedA certain new and useful Improvements in Expansion-Pulleys; and I do hereby declare the following to be a full, clear, and exact description of the in- Vention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to expansible pulleys and belongs to that class of belt-driven wheels wherein independent segments are simultaneously moved either toward or from the center, thereby decreasing or increasing the diameter of the revoluble body directly acted upon by the belt. As the segments are usually precisely alike, their outer surfaces, which together constitute the face of the belt-wheel, are parts of the same cylindrical surface. It is evident that at all but one particular point of their outward and inward adjustments they do not form exactly cylindrical wheel-faces. This is immaterial, however, as the unavoidable variance from a true cylinder is found in practice to diminish the cling of the belt very little, if at all.

The objects of my invention are to simplify and improve the construction and to produce au expansible pulley in which the several .segments are clamped between one fixed and one movable side disk or flange, by means of which the segments are rigidly held in place after being adjusted.

Each constituent element of my invention is described in detail and its individual office,

together with the mode of operation of the whole, fully explained in'this specification.V

Of the accompanying drawings, throughout which like letters designate like parts, Figure l represents a side view with a portion of one disk cut away to discloseV one of the adjustable segments shown in vertical section. Fig. 2 is a vertical cross-section. In this view but one of the segments is shown. As these elements are precisely the same in every respect, structurally and in operation, it is thought that illustrating and describing one segment will answer for all of them. Fig. 3 is an iuside view of the relatively-fixed disk or side of the wheel. Fig. 4 is an inside View of the Serial No. 22,711. (No model.)

clamping-disk. Fig. 5 is an edge view of the4 fixed disk,showing the hub porti0n,thebroken lines denoting the hollow of the hub and the shaft-bore. Fig. 6 is an edge view of the clamping-disk, and Fig. 7 is an outside View of the pressure-plate. The Scale of drawing is reduced in Figs. 3, 4, 5, 6, and 7.

Considering Figs. 2 and 4 of the drawings, letter A marks the relatively-xed dis k, which has a hub a, provided with a central shaftbore a' and a larger cylindrical open-ended cavity a2, to be again mentioned.

In Figs. 3 and 5 will be noted the inwardlyprojecting guides a3 01,3 upon the inner surface of disk A. These guides are formed in pairs parallel with each other and with a radius of the disk drawn midway between them. There are as many pairs of guides as there are reciprocative segments. In the form'illustrated there are eight pairs of guides, accommodating eight segments, although it is believed to be within the purview of my invention to employ any desired number of segments.

Considering Figs. 2, 4, and 6, letter B marks the loose clamping-disk. This disk as ordinarily cast has a central circular opening b. In Fig. 6 it will be observed that the inner surface of the clamping-disk B is provided with guides b b in pairs, and it may be here stated that these guides are exactly like those described in connection with the fixed disk A both as. regards their number and position. Fig. 2 shows that the central opening of disk B ts upon the turned outer surface of the enlargement of hub ct of disk A and that the disk B is loose on the hub a and not secured in any way thereto. The hub of disk A is adapted to be secured upon a driving ordriven shaft in any common Way. Between the two disks are located the segments. (See Fig. 2.) That shown is marked by letter C. The u'ppermost surface (designated by letter c) is the belt-face of the segment. The extent and customary contour of this face and portion are 4shown in Fig. l. Vertically arranged upon opposite sides of the segment-body are the fins or feathers c c, which enter the spaces between the pairs of guides falling opposite each other on the two disks.' Midway of the lower part of the segment is the block c2, usually an integral part of the segment. This block is bored and interiorly threaded to en- IOO gage a screw D, that has a shoulder d in contact with the outside of the enlargement of hub ct, and an unthreaded portion passing through the hub and secured to a miter gearwheel E, located within the before-mentioned cylindrical cavity 0,2 of fixed disk A. The ruiter-gear touches the inner surface of the cavity and, together with the shoulder CZ, prevents the longitudinal displacement of screw D. Outside and inside the surface of the hub a may be slightly flattened to afford sufficient bearing for the shoulder' and gear. Gearwheel E meshes with a second miter gearwheel F, the hub of which is marked f, and in the hub a hole f is bored, as shown, parallel with its axis, and this hole will be again referred to. G, and a portion g of this sleeve is eXteriorly threaded. The unthreaded part of sleeve G extends far enough out of h ubfof gear-wheel F to afford a bearing for the circular pressure-plate H, which is provided with a central opening fitting the sleeve, as drawn. Pressure-plate H has an inwardly-turned rim h and an annular raised portion t immediately around its central opening. This annular raised portion is furnished with a notch or groove h2, (see Fig. 7,) adapted to engage the tooth of a spring-catch, to be later described. Projecting inwardly from plate H and having one end securely fixed therein is the pin J, that registers with and movably its into the hole f in the hubfof miter-gear F, above mentioned. It is now believed to be clear that if the pressure-plate H is turned while the pin is in the hole the gear F must turn with it. It follows also that miter-gear E and screw D must be turned at the same time and the segment moved out or in, its path directed by the guides of the disks, as plainly indicated. Furthermore, it will be understood that the pressure-plate may be moved to the right or left upon the sleeve, thus withdrawing the pin or causing it to further enter the hole. To move the pressureplate in or to permit it to be moved outwardly and to rotate it, and consequently revolve the gearing, is the ofce of hand-wheel K. Handwheel K has a hub la, interior-ly threaded and in engagement with the threaded portion g of sleeve G. Obviously if the hand-wheel, not being connected in any way with the plate H, were turned in such manner as to cause it to move to the left along the sleeve it would force the pressure-plate to the left, which in its movement would press the movable or clamping disk in the same direction, and thus the segment would be securely clamped between the two disks 5 but unless the hand-wheel can be in some manner connected with the pressure-plate when need be neither the plate nor the gearing could be rotated and the segments could not be adjusted in or out. I therefore provide a lever L, pivotally supported by the hand-wheel in any effective way and having a tooth Z,adapted to enter the notch 71,2 in the annular raised Gear F is keyed upon a sleeve' portion of the pressure-plate. The toothed extremity of the lever L is pressed upon by a coil-spring M, making it, in fact, a springcatch, as stated. With the tooth in the notch the hand-wheel, pressure-plate, sleeve G, and gearing all turn, and the segment is moved either in or out, decreasing or enlarging the belt-wheel body in the usual way. When the pulley is in use, the segments are clamped between the disks A and B, and if a new adjustment is desired the hand-wheel is screwed to the right or outwardly upon sleeve G, the tooth Z of lever L being raised out of the notch h2 prior to this movement. After the hand-wheel has thus relieved the pressure upon plate H, and consequently from disk B, no difficulty is experienced in adjusting the segments. It will be noted that when the tooth Z of the lever L is again caused to engage the notch h2 in the pressure-plate H and, as stated, the hand-wheel K, the pressureplate H, the sleeve G, and the gear-wheel F are all connected together and turn as one piece upon the shaft the threaded hub 7c of the hand-wheel does not move either to the left or right upon the threaded portion g of the sleeve G, because the sleeve turns also. Pressure plate H is therefore not forced against the loose clamping-disk B and no clamping of the segments results. After the segments have been adjusted either toward or from the center by means of the gearing and the screws D, during which all the connected parts just mentioned turn together, then the tooth Z of the lever L is once more raised out of the notch 71,2 and so held while the hand-wheel is turned. Now the pressureplate H is no longer rotated by the handwheel and the gear F and sleeve G do not turn, although the hole f' in the gear-wheel still engages pin J, projecting from the pressure-plate H. The sleeve remains stationary, and the hub 1c of the hand-wheel K acts as a nut on the sleeve and may be screwed to the left against the pressure-plate H, which in turn presses against the disk B, thus clamping the segments after adjustment between the fixed disk A and clamping-disk B and holding them securely in place. Fig. 2 shows the segments so clamped. The office of the collar N, having set-screw n, is to take up the reaction of sleeve G, the sleeve being forced to the right as the hub 7c presses plate H tothe left. The collar 'also limits the movement of the hand-wheel to the right.

I am aware that expansible pulleys have been constructed in which the segments are moved to and from the center by means somewhat similar to those herein shown and described, and I do not claim those features.

What I claim, and desire to secure by Letters Patent of the United States, is-

1. In an expansible pulley, the combination of a relatively-fixed disk, segments adj ustable toward or from the center of the pulley, means for guiding the segments, a loose clamping-disk, and mechanism constructed IOO IIO

and arranged to adjust the segments and to operate the said loose clamping-disk whereby the segments may be clamped between the two disks after adjustment, substantially as described.

2. In an eXpansible pulley, the combination of a relatively-fixed disk, a loose clamping-disk, each of the said disks having radial guides upon its inner surface, segments adjustable within said guides toward or from the center of the pulley, a pressure-plate, and mechanism constructed and arranged to adjust the segments and to force the pressureplate against the loose clamping-disk whereby the segments may be clamped between the two disks after adjustment, substantially as described.

3. In an expansible pulley, the combination of a relatively-fixed disk having a hub possessing an internal cavity, a loose clamping-disk having a central opening encircling the said hub of the fixed disk, each ofthe disks having radial guides upon its inner surface, segments adjustable in the said guides segments and having unthreaded portions r passing through the said hub into the cavity therein, gear-wheels located in said cavity and adapted to turn the said screws, a sleeve attached to one of the gear-wheels and having a threaded portion, a pressure-plate movable laterally upon the said sleeve and arranged to be forcedV against the loose clamping-disk, eXtensible connections between the pressureplate and gearing, a threaded hand-wheel engaging the threaded portion of the said sleeve, devices whereby the hand-wheel and pressure* plate mayi be detachably connected, and a collar N having a set-screw, substantially as described.

In testimony whereof I affix my signature ,in presence of two witnesses.

Witnesses:

NEWTON P. FRYE, CLiARLEs H. LITTLEFIELD.

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