US PATENT SUBCLASS 212 / 247
.~.~ Gear drive

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.~.~ Gear drive {1}
248  DF  .~.~.~> Including rack or worm

DEFINITION

Classification: 212/247

Gear drive:

(under subclass 245) Apparatus wherein the means to swing the boom* horizontally comprises a power transmission which includes a disc or annular member having a tooth surface which is interdigitated with a second toothed member whereby movement of one of the members causes movement of the other member.