US PATENT SUBCLASS 246 / 461
.~.~ Cast bound


Current as of: June, 1999
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246 /   HD   RAILWAY SWITCHES AND SIGNALS

454  DF  CROSSINGS, FROGS, AND MATES {11}
460  DF  .~ Central inserts {1}
461.~.~ Cast bound


DEFINITION

Classification: 246/461

(under subclass 460) Subject matter in which the inserts are secured in position, in whole or in part, by casting hot and comparatively soft metal (as spelter) or cement, which enters sundry cavities and on cooling secures the block in position or prevents the bolts, wedges, or other fastenings used from working loose under stress.