US274349A - Pulley - Google Patents

Description

(No Model.)

G.- S. LONG.

. llfedde: A l M I mi 4 2@ M Y M ma *y ci NITED STATES PATENT 'i erica.'

PULLEY.'

SPECIFICATION formingpart of Letters Application led March 11, 1882.

To all whom it may concern .Be it known that I, GEORGE S. LONG, of Hartford, in the county of Hartford and State ofConuecticut, have invented certain new and useful Improvements relating to the Uonstruction of Pulleys, of which the following is a speciiication.

My invention may be employed in the man-` ufacture of pulleys of a great diversity of sizes and forms; but it is more especially important in making large pulleys of considerable width for use on the line-shafting and other sh aft-in g of manufactories. I will describe it as applied to the manufacture of such pulleys. pulleys ordinaril y employed for such situationsv add greatly to the Weight ot' the shai'ting and to the friction and wear. I make pulleys of equal and greater efticiency with less weight. I employ paper as the material for the periphery. rIhehub and arms may be of cast-iron or other suitable material, the ends of the arms beingprovided with broad bearing-surfaces, on which a specially-prepared rim of paper is applied and secured by riveting or other suitable means. I can make my pulley in two pieces and realize the facility of application and re-` moval on any part oi' a shaft, due to such construction. The frictioual qualities of my paper surface very considerably excel that of iron. I can give any required degree of roundness or couvexity to the periphery. I can run myimproved pulleys with safety at a very high velocity by reason of the strength and lightness of its periphery.

The accompanying drawings form a part of this specification, and represen t whatl consider the best means of carrying ont the invention.

Figure l is a side view of a pulley, partly in section, with the embracing-clamps which are employed to temporarily confine the rim. Fig..

2 is an edge View, and Fig. 8 a corresponding central section. In Fig. Z'the clampingband is omitted. Figs. 4, 4a, and 4l show my paper rim in three successive stages of tbe manufacture. The drawings are cross sections through the rim and through the adjacent portions of the rolls employed to compress and shape the paper-pulp for the rim. Fig. 5 is an end View of the split arms where the two parts of the center or spider are joined. Fig. 6 is an end view of one of theordinary arms. Fig. 7 is a corresponding View oi' the end of one ofthe arms on The iron Y Patent No. 274,349, dated March 20, 1883.

(No model.)

which the abutting ends of the rim are brought together and secured. Fig. 8 represents a modilication. It is a central longitudinal section.

Similar letters of reference indicate corresponding parts in all the figures. Ais a hub, of cast-iron or other suitable material, formed in two parts matched together and strongly bolted, and provided with a keyseat for securing on a shaft. (Not represented.) i n A' A', 87e., are arms, which may be curved to any desired degree, but which I prefer, for general purposes, shall be made exactly straight. y

.AAz A2 are broad ilanges or faces formed at the outer ends of the arms to receive my paper rim.

The invention may be carried out with some success by making the bearing -surfaces A2 simply rectangular; but I prefer to give them the form of a Greek cross. The rivets G are applied in both branches ot' the cross,'as represented.

B is the rim. It is of paper, or of compacted paper-pulp analogous to paper. Its inner surface is exactly cylindrical. is swelled to exactly the degree required to retain the belting properly while running.

The material for the rim is prepare-din the same manner as for paper, with a proper amount of sizing to give great hardness and tenacity, with the capacity for resisting moisture. lt is reduced to form by passing through successive pairs of rollers, care being taken to cause the first rolling while the pulp is Wet and highly plastic to reduce the material to the form required, excepting that it is a little too thick. The subsequent rollings exclude more Water and condense the fibrous mass more and more without changing its form, except to reduceits thickness. When completed the edges are trimmed by a revolving knife and the ends cut ott'. Then the whole is curved by bending it'arouud the previously-preliared skeleton of the Wheel and confining itin place until set by properly-formed clamps operated by screws or otherwise. The abutting ends are not straight, but are formed the one with a recess, b, and the other with a correspondingtongnc, b', as shown clearly in Fig. 2. These, being properly matched together, present a smooth surface on the exterior and strongly lock each lts outer surface IDO other against lateral displacement. The moisture having been expressed from the material by the successive rollin gs, its h ardness ap.- proximates to iron. The clamp should be perfectly circular, but its width should be much less than the rim B of the pulley. Mounting the partially-completed pulley by its center on a suitable mandrel, the several points in its periphery are bored by a proper' drilling-ma chine and the outer face slightlycounterbored or countersunk. The holes are bored through both the hard -paper rim B and the broad anges A2. Soft-iron rivets C are finally applied from the inside outward, and are properly held and riveted. The spread dueto the riveting should exactly till the contersink and leave the exterior surface ush. For narrow pulleys the riveting on each edge is sufficient.

For wide pulleys the clamp is removed and aus,

other line of rivets put in along the central space previously covered by the clamp.

1t will be observed that there are two lines of rivets at the junctions of the hard-paper periphery. 4

Mywheelis lighter with a given width and strength than any before known to me. It

, will endure all ordinary and extraordinary means, it' preferred, instead of rolling. I propose, in cases where the expense will be warranted, to build up the hard-paper rim by successive layers ofthinner paper material. This may be accomplished by winding the web of paper as it is received from a Fourdrinier or other paper-machine, and subsequently passing it through rolls a number of times with a juries.

or without painting. Where it is desired to properly-severe pressure. In such case the paper-stock is accumulated evenly, or nearly so, with the bers lying more uniformly than when applied in a mass ot' pulp; but for ordinary pulleys such-refinement is not necessary. Theentire wheel may be painted or otherwise lcoated to improve its appearance and defend its iron portion against corrosion and other in- The paper will serve well either with make the pulley in two halves the entire periphery may be made in one piece, with its ends abutting squarely together; but in all cases I prefer that the skeletonor center shall be madewith the opposite arms exactly alike, so as to balance.

My pulley may be made in sections of small arms of half-round wrought-iron or rolled steel,

each with acurved arm from its outer extremity, extending the whole length of .the arc from it to the next, and matching in a proper recess in its neighbor, thus re-enforcing the Vpaper in a continuous line around the periphery. When the pulley is so constructed the hub may be united to the spokes or arms by casting it to them.

The skeleton or framing ot my pulley may be made in two halves, still retaining this general construction ot' spokes, in which case the pulley may be removed from or placed on a line of shafting by removing the fasteningbolts and springing it open, so that the two halvesseparate enough to allow the shaft to pass into or out of the hub.

I am aware that it is not broadly new with me to constructapulley the periphery of which is partially or wholly made of paper with a rounded outer surface; 'norv is it broadly new with me to employ a split spider, as these features have been before employed in other constructions to perform their separate functions.

What I do claim is- In a belt-pulley, the combination ofthe frame or spider, formed in sections, and composed of the hub A and' arms A', having curved bear- `ings A2, and means for securing said sections ISO IOS

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