US680994A - Wood pulley. - Google Patents

Description

y a citizen of the United States, and a resident l Pulleys, of which the cation.

i p cate parallel slats or bars, each of which is construction and combinations of devices, all

p 4 is an enlarged sectional View taken on the the cost of manufacture, and render the pul-` claims.

`or bars used to bind the pulley to a shaft.

NiTE STATE-sf ATENT Erica.

WOOD PU LLEY.

SPECIFICATION foming part of Letters Patent No. 680,994, dated August 2o, 1 901. Application inea July 24,1899. saai No. 724,884. (No moda.)

To @ZZ whom, t mayconcern:

Be it known that LFREDERICK W. GUENEY,

of Roan Mountain, in the county ofCarter and State of` Tennessee, have invented certain new and useful Improvements in Wood `following is a specifi- My invention relates tothe construction of Wooden pulleys, particularly to the class of separable or split pulleys; and its object is to simplify andimprove the construction, secure a better grip uponthe shaft, reduce,

leymore durable and substantial.

My invention consists in centering the pulley upon a shaft by means of sets of duplibuiltinto the rim at one end and has an` overlapping hub-butt at the other end, makinga practically solid hub and materially increas-V ing the grip of the pulley upon the shaft.

It also consists in certain other features of as Will hereinafter more fully appear, and be particularly pointed out in the appended In the accompanying drawings, Figure l is a side elevation ofl a pulley constructed in accordance With my invention." Fig. 2 is a central vertical section taken on the line ww, Fig. 1. Fig. 3 is a'plan of the pulley. Fig.

line y y, Fig. 1, and illustrating the manner of lapjointing` the `halves of theupulley, as Well as the method of building the slats into the rim. Fig. 5 is an enlarged fragmentary face view of the pulley, showing the halves separated; and Fig. 6 is an enlarged perspective view of one of the clamping plates Throughout the several views like parts are indicated by like numerals. The rim l is built up of a series of Wooden rings or layers 2 in a Well-known manner, each layer being composed of a series of seg-` ments 3, placed end to end and preferably breaking joints, as shown. The rim is supported upon Wooden slats, each terminating at its inner end in abutt 5, having a spoke portion l, and at its outer end being formed Each slat is preferably a duplicate of the others, and in each butt is a centering cutaway 7, which may t directly upon a shaft, if the latter is of suitable diameter, or else upon the usual Wooden half-bushings 8, of cylindrical form, Whose inner diameter is such as to fit the shaft 9. In either case it will be noted that the cut-away 7, Whether of the illustrated semicircular shape or of some other suitable shape, serves to center the pulley directly upon the shaft or cylindrical support. As usual, bushings of various thicknesses may be supplied for each pulley, so that it may be readily centered upon shafts of various diameters.

The Slat-butts lie one against 'another to form a virtually solid hub for the pulley, and the cut-aways or recesses 7, being all in line, form a central opening for the shaft. The length of bearing thus given the pulleyupon the shaft is equal to the aggregate thicknesses of the butts and about equal to the Width of the pulley-face, thus both affording an increased shaft-gripping surface and insuring the true centering of the pulley upon the shaft. It will be noted that all strains are in direct lines from all parts of the solid hub to the rim. Y

`The slats are alternating, with their heads extending in about opposite directions, so that spaces are left between the spoke portions but not between the hub portions. Three slats are shown in the upper portion of the half-pulley at Fig. 2 and four in the `fewer slats and one with a Wider face with more slats; but in all cases the preferred construction is to arrange one more slat in `one pulley-half is placed next to the smaller group of slats in the other pulley-half, thus giving the pulley a running balancemso that it rotates smoothly, lasts longer, and isbetter adapted to high speeds) and also equalizing the strength of the pulley at the opposite portions near the lap-joints.

The thickness of each slat at its head p0r-` l tion, and preferably throughout its length, is`

preferably equal to the thickness of 'one of the segments 3 of which the rim layers 2are built up, the head 6 being built into the rim and serving as a portion of the face or belt surface of the rim. In building up the pulley each spoke-head 6 is preferably glued or cemented to the rim layers on each side of it and is also separately nailed or screwed to its adjacent rim layer 2, as at 10, Fig. 4. Since a layer is placed over each nail or screw after it is-driven home, it is impossible for the latter to Work loose.

Thespoke-heads and layers are still further secured together by means of headed bolts 12, each passing through the series of combined layers and heads and provided with a binding-nut 13. Finishing or edge layers 1l are added to the rim, each provided at proper points on its inner side with recesses 14 to form housings for the bolt-heads 12 and nuts 13. By this construction the pulley-rim is provided with unbroken edges or sides without projecting heads and nuts, which would be a source of danger toawork- -man when slipping a belt over the pulley.

The nuts cannot work O from the bolts, nor

can the bolts Work out.

The rim halves are united by lap-joints, as shown at Fig. 5. The half-pulleys are not made right and left, but all alike, so that any half-pulley can be readily joined to any other half-pulley of the same dimensions. This will be understood by reference to Fig. 1, where the line of division is indicated by full lines at a a. By this construction not only is the process of `manufacture simplied and cheapened, butin case only one half of the pulley becomes damaged at any time when in use or in transit it can be replaced Without the lnecessity of providing an entire new pulley.

When the pulley halves are assembled, a fastening-pin l5 is passed through a hole 16, bored transversely throughfeachset of interlocking segments, thus producing a substantial union of the two yhalves and rendering the pulley about as strong at this as at other.

portions.

For clamping the butts to the shaft headed bolts 17 are provided, each'of which extends transversely through both sets of butts (each set forming a half-hub) and binding them Iirmlyto the shaft by means of nuts 18. The

bolts are shown in section at Fig. 2, and it `vill be noted that a passage-way for the bolts is made without unduly weakening any butt, as'each bolt passes between two butts, in the side faces of which half-round -grooves are cutfto receive the bolts, the groove in one butt matching the groove in the adjoining butt. No butt is cut away at any point more than half the thickness of a bolt.

To avoid injury to the butts and .to bind them all firmly to the shaft, plates 19, suitably perforated at 2O for the entries of the bolts, ymay be placed between the butts and the bolt-heads and nuts.

flexing of the slats when turning up the nuts tends not only to bind the two halves of the pulley-rim firmly together, but also to stiffen the entire structure. Any desirable degree of flexibility may be obtained by cutting away the edges of the slats at the portion near their outer ends, as at 23. A space or clearance at 22 is left between the half-hubs when they are fixed upon the shaft, so as to insure their being clamped thereon without liability of nnllifying the action of the nuts by pressing against each other instead of against the shaft.

If desired, the plates 19 may be provided With overhanging ears 2l, so that each plate, with its ears, forms a clip, confining the slats against lateral motion and adding to the substantial character of the contrivance. The butts may also be glued and nailed or bolted together, as at 21X. It will be noted that by passing the bolts directly through the hub all of the slats are -irm'ly clamped'to the shaft or cylindrical support.

In mounting the pulley the halves are first placed in position upon the shaft or bushings. vOne set of hub-bolts is then drawn up until the rim-pin 15 can be inserted on that side. Then the bolts are drawn up on the other-side ofthe shaft until the opposite pin 15 can be inserted. Then all bolts are tightened until the lhub is clamped firmly to the shaft. To remove one of the rim-pins 15, the bolts upon the Vopposite side of the shaft should first be loosened.

Each slat or bar is of a length greater than the radius of the pulley and extends from one side ofthe pulley past the center thereof, 'but not over to the opposite side, the extended portion being preferably only great enough to overlap the oppositely-projecting next adjacent or alternately-arranged slat or bar and at about the junction of its arm 4 and butt 5. It will be noted that each arm terminates at its inner end in a hub-butt and at its outer end supports the rim at about the point of union of the pulley halves, making a Vfirm construction, that the rim is supported upon two equipoised sets of alternately-arranged slats, each set having the same nu rnber of slats, one set extending across the pulley upon one side of its axis and the other set extending across the pulley on the other side of its axis,where by a running balance is secured, that each half-rim is supported upon slats provided at their 'inner ends with overlapping butts and extending alternately at their outer ends to opposite portions of the rim, and lthat each half-hub is virtually solid or continuous'and composed -wholly of a series of similar and overlappingspoke-butts.

The use of duplicate slats throughout en- IIO . l y struction.

and being also provided at its inner side or ables a reductionto be made in the `cost of `manufacture Without detracting from the usefulness of the pulley.

It will be seen that my pulley is of the class in which the system of spoke-arms as an entirety extends crosswise or diametrically from of the spokes being preferably parallel. The

spokes are attached to the rim at their outer `ends only. Their inner ends terminate in butts which cross the hub, or, in other words, the spokes terminate beyond the center of the pulley. Thebuttsare provided with ceni ially of the pulley. The butt -portions may 25 all be arranged in face contact, forming a series of butts extending axially of the pulley,

i so as to produce a solid hub or half-hub, which is preferably formed of butt portions solely,

Without the intervention of spacing or filling blocks. My spokes are cla1npingsp0kes,and taken altogether form a clamping device i which is distinct from the pulley-rim, the

clamping action being secured by springing together the opposite halves of the system of cross-bars, which is done without distorting the rim` or throwing the pulley out of center. It will also be seen that the full thickness of each spoke clamps upon the shaft, and hence the spoke transmits a maximum of power directly from the shaft to the rim, or vice versa.

Although I have shown and described only my preferred construction, I do not intend to limit the scope of my invention thereto, since without departing therefrom many variations maybe introducedin the detail con- Many portions of my invention are also applicable to solid or non-separable pulleys.

What I elaimas new, and desire to secure by Letters Patent, is-- l. A pulley comprising arim and two series of oppositely-projecting alternating wooden spoke-arms, each arm being secured at one end only to the rim and terminating at its other end beyond the center of the pulley,

\ terminating j ust past the center of the pulley,

and having at its side a centering cut-away or notch, and all of the oppositely-projecting alternating butt-ends overlapping at the center of the pulley and being arranged in cons tact face to face, and with their notches or cut-aways all in line axially of the pulley, and the entire series of arms thus constructed and arranged forming a practically solid pul ley-hub.

3. A pulley comprising a rim built up of a series of similar layers, and a series of oppositely-projecting wooden slats, each terminating at one end in a head and at the other end in a butt and being of the same thickness as a rim layer, each head being built into the rim as if it were part of a layer, and

` all of the butts overlapping and terminating centrally of the pulley and so constructed as to form the pulley-hub.

4. In a pulley, the combination with a rim, of sets of oppositely-projectiug Wooden slats terminating in overlapping hub portions and extending crosswise of the pulley, on one side of the axial line thereof; other sets of oppositely-projecting slats terminating in overlapping hub portions and extending crosswise of the pulley, on the opposite side of the axial line thereof; a clearance-space being left between the two sets of slats at their hub portions when they are clamped upon a eylindrical support; and means for clamping the hub portions upon a cylindrical support.

5. In a pulley, the combination with a rim of a diametrical cross-bar comprising half portions arranged upon opposite sides of the center of the pulley, and each half portion consisting of a series of oppositely-projecting alternating slats, the outerends of which are built into the rim, and the inner butt-ends of which overlap and extend past the center of the pulley, said butt-ends being provided with notches or cut-aways upon their inner edges or sides and at the center of the pulley, and means for binding the opposite series of notched butts upon a cylindrical support.

6. In a pulley, the combination with a rim of a series of oppositely-projecting alternating wooden slats built into the rim and terminating in overlapping centering-butts having notches or cut-aways in their side ledges,

vthe slats being cut away at their outer porl tions, as at 23, to increase their ilexibility, and means for bindingthe butts upon a cylindrical support.

7. In a pulley, the combination with a rim, of a series of oppositely-projecting alternating wooden slats xed only at the points of union with the rim, each slat extending at its free end beyond the axial line of the pulley, overlapping the adjoining slat, and provided with a centering cut-away, and means for applying compression to the slats at their free ends in a direction about crosswise of their length, whereby the free ends are forced toward the pulley-axis, and caused to grip their common cylindrical support.

8. A split pulley, each half of which is constructed with a series of oppositely-projecting alternating wooden slats, each of which IOO IIO

agp

terminates at its inner end in a hub-butt, and

at its outer end is joined to the rim at about the point of union of the half-rims.

9. A split pulley constructed With duplicate halves, each half comprising a rim portion and Va series of oppositely-projecting alterating Wooden slats terminating about oentrally of the pulley in a solid half-hub formed by notches cut in the side edges of the terminal portions of said slats.

10. A pulley comprisinga rim and two equipoised sets of oppositely-projecting alternating Wooden centering-slats, cach set having ing alternately from the hub to opposite por-` tions ot the rim, there being more slats eX- tending in one direction than inthe other; the construction being such that When the half-pulleys are united the portion of one of the halves having the fewer slats may be placed next the portion ot the other half having the greater number of slats, whereby a running balance is secured.

12. In a pulley, the combination with a rim, of sets of alternate Wooden slats arranged on opposite sides of the pulley-axis, each slat joined at one end to the rim and terminating at the other end in a centering-butt, plates 19, having ears 2l for confining the butts, and bolts 17 cooperating with the plates to clamp the butts upon a cylindrical support.

13. In a pulley, the combination with a rim, of sets of alternate Wooden slats arranged on opposite sides of the pulley-axis, each slat be'- ing joined to the rim and provided with a centering portion, the slats having matching bolt-grooves cut in their sides, plates 19, and bolts 17 passing between the slats Within said grooves and cooperating With the plates to clamp the slats upon a cylindrical support.

14. In a pulley, a set of parallel slats built into the rim at their outer ends and extend ing crossWise inwardly from one side of the rim and terminating at their inner ends about centrally of the pulley in hub-butts, a second set of parallel slats also built into the rim at their outer ends and extending crosswise inwardly from the opposite side of the rim and alternatingWi-th the -iirst set of slats and terminating at their inner ends about centrally of the pulley in hub-butts, the hub-butts of both alternating sets overlapping and contacting facevvise and constructed to form an elongated half-hub.

Signed at Roan Mountain, in the county of Carter and State of Tennessee, this 17th day of July, A. D. 1899.

FREDERICK W. GURNEY.

Vitnesses:

E. H. ORUTCHER, R. C. SEssroNs.

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