USRE498E - Improvement in cast-iron car-wheels - Google Patents

Description

.i urin g the colnpactn ess NSON ATWOOD, OFTROY, NEW YORK.

IMPROVEMENT IN CASTf-IRON CAR-WHEELS;

Specineation forming part of Letters Patent No. 5,112, dated ,May 15,

v September 22, 1857.

12347,' Reissue No. 498, dated To all whom, t may concern/:'-

lie it known .that I, ANsoN ArWooD,-of Troy, in the county ot' Rensselaer and State of N e'w York, have invented a new and useful Improvement in Cast-Iron Wheels for Railroad-Gars; and Ido hereby declare that the following is a full, clear, and enact description thereof, reference being had to .the accompanying drawings through letters of reference marked thereon. v v

In the casting of iron car-Wheels with a chilled rim ,the metal in iiowing in against the chill solidies immediately oncoming in cou- 'tat with it, and in the variety of wheels used prior to my invention the continuous tlow of the metal, in rising to lill the mold of the rinr, d'isturbsthe metal which had previously l'lowed inA and become partially set, thus inot" the met-al in the part of the wheel on which is the most Wear.

lhe object ot'my invention is toprevent this, which is accomplished by forming the disk of -a castliron wheel of a lcorrugated or waved shape, the exterior periphery ot' which unites with the rim of the wheel in a serpentine or zigzag line from side to side all round, so thatv the metal in flowing; in finds achaunel', from iirst to last, on a level with the surface of that which preceded it, so that it is .never disturbed after it once comes in contact with the chill. This corrugated disk is also essential to compensate .tor the unequal contraction of the metal in the direction of the circumference, arising from the rim being cooled first by coming in contact with the chill in the process of casting.

In the accompanying drmvings, Figure 3 is a perspective View of my wheel, and Fi g. 4 a section. through .the axis of the same.

@represents the solid hub; d, the arch or l1ollowr ring that surrounds it, c e are oritices in this ring to admit the removal ofthe core after the casting nas neen inane. a represents the rim, and b the single plate connecting it with the ring or arch.

ing from near the ends ing about midway between it and the rim, constitute a kind of brace to resist the' lateral strain upon the wheel. Their curved form,` also, as represented in the drawings, is best adapted to yield to the radial contraction of the wheel after the setting of the rim from the effect of the chill thereon in the process of casting. I cast the single plate b in the .form ot' a succession ot waves, passing entirely around, by a series of curves or angles, from one edge of the rim to the other to give a continuous support to the whole Width of the rim and provide for-the contraction of the plate in the direction of the circumference ot the wheel, also to admit the iowing in of the metal to the rim on the surface of that which preceded it without' disturbing it aftcrit has partially set against the chill, thus insuring a more solid v rim and perfect chill.

The place of greatest strain in railroad carwheels, aswell as in those forcommon roads, is at or near the' hub, and that part should have greater strength of structure than those nearer the rim. The two plates, rising from the hub and extending part ofthe way, and a single plate for the remainder, properly apportions the material to the strength required. f

Vhat I claim Ias new, and desire to secure by Letters Patent, is

A cast-iron disk corrugated in the manner substantially as and fou the purposes described, When used in connection with the chilled rim of a castiron wheel.

' A NSON ATWOOD. fitnesses W.; SEsKI, WM. M'. SMITH.

The two plates, sta'iltof the hub, and meetf` therefore, I

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