US296317A - Means of keying wheels - Google Patents

Description

(No Model.)

G. DAWE'.

MEANS OF KBYING WHEELS, PU LLEYS,.&G., TO- SHAFTING. No. 296,317 j Patented A r. 8,1884.

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MEANS OF KEYI NG WHEELS, PULLEYS, 860., TO SHAFTING.

SPECIFICATION forming partof Letters Patent No. 296,317, dated April 8, 1884. Application filed February 28,1884. (No model.)

To all whom it may concern.-

Beit known that I, GODFREY Dawn, a citi-- zen of the United States, residing in the city and county of Eau Claire, and State of W'iscousin, have invented a new and Improved Means for Keying Pulleys, Wheels, and the like'to Shaftin'g, of which the following, in connection with the accompanying drawings, is a specification.

This invention relates to a taper key with sharp longitudinal edges and an intermediate inner or under face, constructed in form of a part of a circle whose radius is less than the radius of the shaft to which the key is to be applied; and the object of the same is to insure the firm keying of pulleys, wheels, eccentrics, or cams, and the like, to shafting without the necessity of providing a key-scat on the shaft; and this object- I attain by adopting the aforesaid concave sharp-edged key, which enters into or takes a sufficient hold upon the metal of the shaft on opposite sides of the center thereof, when driven up tight into the usual tapered key-seat of the hub of the pulley or wheel, to prevent the pulley or wheel turning on the shaft.

In the accompanying drawings, Figure l is a transverse section through the hub of a pullongitudinal section of the shaft, pulley, and

key shown in Fig. l.

A in the drawings may designate a pulley, wheel, eccentric, cam, or other part of machinery attachable by key B to shafting. This pulley is provided in its eye or bore with an inclined key seat or groove, a, which is cut into the metal of the hub from end to end, as usual, or as shown in the drawings.

0 is ashaft, made cylindrical along that por tion where the pulley Ais keyed to itthat is, it is turned or finished without cutting away or making a key-scat in it, thereby avoiding a great amount of the time andexpense required when such key-seat is provided, and also saving the shaft from being weakened by the cutting of it down to form suchkey-seat. Further, the

ever required upon the shaft a great deal of time in laying out shafting is saved, and all parts of the shaft being turned cylindrical, 5

bearings, pulleys, or wheels can be attached at any desired place longitudinally of the shaft. The shape of the key B is similar in many respects to the key in ordinary use, except on its under side, or the part which bears upon the shaft, it is constructed with two parallel sharp cutting edges or ridges, b 12, extending the full length of the key. These sharp edges are formed by constructing the under inter mediate surface 0 of the key with a concave form, the segment of the circle of which concave surface is struck from the center of acirole having a smaller radius than the radius of the circle of the shaft 0, as illustrated in Fig. 1, and the sides of the key outside this concave surface being tapered downward on an angle sufiicient to form, with the termini of the concave, a cutting-edge, b, on each side, said cutting'edges being as near as possible to the vertical sides of the key, or only slightly overhung by the same. The key also has a taper, as usual, of one-eighth of one inch to every three inches of its length, corresponding to the inclined of the hub of the pulley.

By means of the taper form of the key and the sharp cutting-edges b?) a firm hold of the key upon the shaft is secured, for as the key is driven home in its seat a. in the hub of the pulley the key is forced inward, and its cutting edges or ridges gradually out two very slight parallel channels into the surface of the shaft, and thus any turning of the pulley on the shaft will be impossible.

The key does not require to be driven home as hard as the common square tapered key in a seat.

I am aware that it is not new to fasten or key a pulley or other part of machinery upon a shaft by means of the frictional bind of a concentrically-curved surface upon the shaft, the binding force being produced by the combined action of a bolt and two reversely-inclined key-pieces; but this construction differs widely from my simple invention of a tapered key with sharp edges or ridges separated by a circular surface in relief from the shaft to which the key is applied.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A key for fastening a pulley,Wheel cam, eccentric, or other analogous part of machinery to shafting, consisting of atapered bar having parallel sharp ridges or edges separated 5 by a concave surface in relief from the shaft, substantially as and for the purpose described.

2. The combination, with a hub provided with a tapered key-seat, a, of a tapered key provided with parallel sharp ridges or edges 10 separated by a concave surface in relief from the shaft to which the hub is to be keyed, substantially as and for the purpose described.

3. The key having its edgesbeveleddown- Ward and its under surface made with the concave c, substantially as and for the purpose 15 described.

GODFREY DAWE.

Witnesses:

W. H. BROWNING, THos. KEMP.

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