US61703A - of manchester - Google Patents

Description

@uitrh giants i nited @ffirr.

N. S. BEAN, OF MANCHESTER, NEW HAMPSHIRE.

Letters Patent No. 61,703, dated February 5, 1867. I

IMPROVEMENT IN GARRIAGE-WHEELS.

TO ALL WHOM IT MAY CONCERN: I

Be it known that I, N. S. BEA N, of Manchester, in the county of Hillsboro, and State of New Hampshire, have invented an Improvement in the Construction of lVheels having wooden spokes and metallic huhsr and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is a description of my invention suflicient to enable those skilled in the art to practise it. In that class of wheels mostly used under heavy weights, in which the spokes are'of wood set into mortises metallic hubs, it is common to reduce the ends of the spokes entering the hubs into tenons, which, to

keep them tight in the mortises formed in the hub, have but little taper, as it is found in practice that if the spokcs are considerably tapered in the whole, or any material part of their length, where they enter the'huh mortiscs, they work loose when the wheel tire stretches. Hcretofore it has been the practice to form the huh tenons on the spokes with square shoulders, fitting upon the peripheral surface of the hub, but the effect of this in connection with metallic hubs is very often to split oil the wood of the spoke where it extends beyond the side surfaces of the tenon. To retain the advantages of little or no taper 1n the-length of the spoke tenons at their hub ends, and to prevent thewood of the spoke from splitting upward from the sides of the tenon, through being forced upon the periphery of a metal hub, is the object of my invention, which consists in making the shoulders or oil'sets, at the juncture of the tenon and spoke, with a bevelled formation instead of a square one, with a corresponding bevelled formation of the mouth or entrance of the hub mortise.

Figure 1 shows a sectional view of a portion of a metallic hub, with three wooden spokes set therein, in accordance with my improvement; and

Figure 2 shows a similar view of the ordinary way of setting wooden spokes in metallic hubs.

The metal around the axle cavity is marked a; the meta-lot the hub Forming the sides ofthe 'mortises which are cored in the hub is.marked I), while the line representing the peripheral surface of the hub is marked a c. The tenons on the wooden spokes are marked (1, and the spokes themselves are marked 2. In fig. 2, which illustrates the old construction, it will be seen that the shoulders, at the junction of the spokes e with the tenons d, are substantially square or at right angles with the central lines of the spokes, said shoulders resting directly on the peripheral surface of the hub. In fig. 1, which illustrates an embodiment of my improvement, it will be seen that thetenons blend into the spokes with bevellel or inclined surfaces, which correspond to depressions made in the material of-the huh, so'that the shoulders formed at the junction of the spokes with their tenons are inclined or bevelled instead of square or right-angular, and that they rest within the material of the hub instead of on its peripheral surface.

It will be evident that this peculiarity of construction greatly lessens the liability of the splitting of the wood of the spokes upward from the hub, and that all theadvantages pertaining to substantial parallelism of the surfaces of the spoke tenons are preserved.-

I claim the peculiarity ot' construction of the mortises ot' the me spokes, substantially as and for the purpose set forth.

tallic hub, and of the tenons of the wooden N. s. BEAN.

Witnesses J. B. ,Gnosnr, F. GOULD.

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