US856675A - Car-wheel. - Google Patents

Description

PATENTED JUNE 11, 1907.

T. s. BLAIR, JR.

GAR WHEEL.

k A 0 s R I A THOMAS S. BLAIR, JR., OF ELINIHUBST, ILLINOIS.

CAR-WHEEL.

Specification of Letters Patent.

Patented June 11, 1907.

Application filed October 30, 1905. Serial No. 285,109.

To all whom it may concern:

Be it known that I, THOMAS S. BLAIR, J r., a citizen of the United States, residing at Elmhurst, in the county of Dupage and State of Illinois, have invented a new and useful Improvement in CarWheels, of which the following is a specification.

My invention relates to an improvement in the construction of car-wheel involving a metal band interposed between the center of relatively soft steel and the tire of relatively hard steel.

The interposed band, in the construction referred to, is a mere flat-sided ring which is inserted into a mold in which the wheel is cast by filling the interior of the ring with molten metal to form the wheel-center, and pouring molten metal into the mold about the ring to form the tire; and for permanent fastening of the ring between the center and the tire dependence is had, solely, on melting the band by the heat of the molten metals sufficiently to effect a welded union between its surfaces and those of the center and tire. The production in this manner of such a union is not reliable, however, so that the flat-sided ring is liable to work loose from the periphery of the wheel-center in the use of the wheel, and thus spoil it, besides rendering it dangerous; or the tire may work loose from the ring, with like objectionable results.

The object of my invention is to provide, preferably by the method of manufacture thus outlined, an improved construction of the aforesaid wheel, whereby the interposed ring shall be securely and immovably retained in lace whether or not it be permanently we ded by the heat to the surfaces between which it is confined. To this end I provide the interposed ring, either, and preferably, as a continuous band, or in arc shaped sections, in a form adapting it to present about its interior surface, an annular recess or pocket to receive and thus envelop the rim-portion of the center, and to present a protruding exterior circumferential sur face to project into the correspondingly recessed or grooved inner annular surface of the tire.

In the accompanying drawing, Figure 1 is a cross-section of a mold suitable for my purpose, the view being in the nature of a dia gram illustrating the procedure involved in manufacturing my improved car-wheel; F ig.

2, a broken sectional elevation of the wheel, and Fig. 3, a similar view indicating a modification.

As shown, the flask A consists of the circular drag A an annular chill A surrounding the dra and the circular cope A surmounting the chill the parts being separably fastenedtogether by pins a passing through coincident holes in cars I) and 0, respectively projecting from the drag and cope, and ears d and d projecting from the chill. When the mold has been formed in the usual way within the flask, with a pattern, in sand B, prior to adjusting the parts of the flask together a metal key, preferably in the form of a ring C, of V-shape in cross section and formed out of angle-iron, and of the diameter intended for the wheel-center is laid, with its chambered side facing inward, in proper position in the mold concentrically with the core B in which a pouring-duct e is provided.

Molten soft steel is poured through the channel 6 into the mold to form the center a of the wheel D, which is shown to be ribbe for reinforcement, about its hub-portion f The metal thus poured extends into the ring 0. After the wheel-center has been thus formed of tough, soft steel, molten steel, treated with chromium, manganese, or other hardening medium, is poured into the mold about the ring C through a duct h in the mold leading from an opening h in the cope surmounted by a funnel 71,2, and fills the space i in the mold about the key C to form the hard-metal wheel-rim f. The key thus joins the center and rim of the wheel, rendering them inseparable. If the metal of the key be very thin, say one-sixteenth of an inch thick, it may be wholly melted by the heat of the two metals between which it is confined and thus combine with them, though even then the junction will be discernible in the completed wheel, as represented in Fig. 3, owing to the difference in the metals. If the metal of the key be too thick to be thus entirely melted, as represented in Fig. 2, it will nevertheless serve to securely join the rim to the center; though there is liable always to be a partial melting of the metal of the key sufficient to combine its surface with the metals between which it is confined. The extent of this combining of the substance of the ring with the surfaces of the wheel-center and tire, between which it is interposed, is

not material, however, since dependence is not had thereon for firmly retaining the tire in place.

My invention is not limited to a complete annulus for the key nor to the angle-shape in cross section illustrated, though that shape is desirableand it is preferred that the key shall form a complete ring.

The gist of my improvement consists in providing the interposed keying ring with a grooved or re-entrant inner annular surface to envelop the rim-portion of the Wheel-center, and with a bulging outer circumferential surface to enter and be enveloped in the circumferentiall y re-entrant or grooved interior surface of the tire so that the cross-sectional shape of the ring may, without departure from my invention, be any that will produce this last described construction with the attendant advantage of permanency in the union of the parts hereinbefore explained. Moreover, While I have immediately devised my im provement for freight-car wheels, it is equally applicable to the wheels of passenger-cars and locomotives.

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

1. A cast-metal car-wheel consisting of a relatively-soft metal center and a relativelyhard metal tire with a metal ring interposed 0 between them having a circumferentially grooved inner surface enveloping the rimportion of said center and a bulging outer surface enveloped in the adjacent circumferentially-grooved surface of the tire.

2. A cast-metal car-wheel consisting of a relatively-soft metal center and a relativelyhard metal tire With a metal ring interposed between and having a Welded union with them, said ring having a circumferentially grooved inner surface enveloping the rim- THOMAS S. BLAIR, JR.

In presence of L. HErsLAR, J. H. LANDES.

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