US PATENT SUBCLASS 212 / 248
.~.~.~ Including rack or worm

Current as of: June, 1999
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212 /   HD   TRAVERSING HOISTS

223  DF  HAVING HORIZONTALLY SWINGING BOOM OR BRIDGE {9}
245  DF  .~ And means to swing boom horizontally {3}
247  DF  .~.~ Gear drive {1}
248.~.~.~ Including rack or worm

DEFINITION

Classification: 212/248

Including rack or worm:

(under subclass 247) Apparatus wherein the second toothed member comprises either (a) a rectangular member having teeth formed across a longitudinal face and which is reciprocated to cause rotation of the disc or annular member, or (b) an elongated cylindrical member having helical teeth on its periphery and which is rotated about its longitudinal axis to cause rotation of the disc or annular member.