US378260A - Pateick mcdeemott - Google Patents

Description

(No Model.)

P. MODERMOT'TJ KEY FOR PULLEYS.

No. 378,260. Patented Feb. 21, 1888;.

WITNEssEsi INVENIOR 7 m'w W9 UNITED STATEs PATENT rrrcn.

PATRICK MODERMOTT, OF MEMPHIS, TENNESSEE, ASSIGNOR TO THE MIL- BURN GIN AND MACHINE COllIPANY, OF SAME PLACE.

KEY FOR PULLEYS.

SPECIFICATION forming part of Letters Patent No. 378,260, dated February 21, 1888.

Application filed December 24,1886. Renewed September 7, 1887.

To all whom it may concern:

Be it known that I, PATRICK McDERMo'rT, of Memphis, in the county of Shelby and State of Tennessee, have invented a new and useful Improvement in Keys for Pulleys, which im provement is fully set forth in the following specification and accompanying drawings, in which Figure 1 is a side view of a wood split pul- IO ley equipped with one of my keys; Fig. 2, a perspective view of the cross bindingpieces, partly in section; and Fig. 3, a detail view.

In the construction of what are known as woodsplit pulleys the parallelpieces which unite the arches or semicircles of which the pulley is composed are provided with bolts, which cause these cross arms or pieces to bind tightly upon the shaft, and are thus held in position. For ordinary pulleys, or in cases "m where the ordinary amount of power is transniitted,this fastening is sufficient and requires no groove and feather; but in cases where the shaft is small and the pulley large or extraordinarily heavy and a great strain is exerted 2 5 it is better to provide additional means to prevent'the pulley from turning on the axle; and the object of this invention is to provide a cheap and efficient means for accomplishing this purpose in such a manner that it can be 50 readily applied by any ordinary mechanic.

The cross-bars A A are constructed in the ordinary manner, so far as relates to their adjustment to the shaft, having centrally the semicircular cross-grooves B to receive the 5 shaft 0 and the bolts D Dfor binding the bars A to the shaft. On one side of the semicircular groovesBthe cross-bars A are recessed out, as shown at E, and the key F, whose width is greater than the width of the recess, is fitted into this recessed space, made by matching the two bars together, as in Fig. 1, and suitable holes, F, are made in each cross- Serial No. 249,661. (No moth-l.)

bar to receive the bolts D. The key thus coir structed projects into the circular space occupied by the shaft 0. In order, therefore, to attach the key to the shaft, it is necessary to have a groove, G, chipped or plowed therein to receive the key. The same bolts, therefore, which tighten the bars in clamping the shall; tighten the key F andpreventthe pulley from turning.

It is obvious that the key may be fitted into the gains formed between the bars A without necessitating the bolts D passing through the same, and in some cases such construction would be preferable; but in order to prevent the loss of the key, and also to add additional strength by making the key as wide as possibio, I prefer for all purposes to have the bolts D pass through the key. It has sometimes heretofore been the practice, for this general purpose, tov fit a collar or bushing to the crossbars, owing to the fact that the wood adjacent to the shaft is more or less likely to be worn away by the constant pressure or strain of the bolts D when in use. By the use of the key, however, a less pressure on the part of the bolts is necessary to accomplish the same p'urpose,and in addition the simplicity and cheap ness are apparent.

Having described my in vcntion, what I claim as new is-- The combination of the cross-bars, each grooved-and recessed as described, with the key and the bolts passing through the bars and key, said key being adapted to enter the groovein the shaft, substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand, this 31st day of August, 1886, in the presence of witnesses.

PATRICK MGDEBMOTT.

\Vitnesses:

Hunsnon Gary, JOHN D. MILBURN.

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