US PATENT SUBCLASS 254 / 134.6
.~.~ Step-by-step type (e.g., by camming against messenger)

Current as of: June, 1999
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254 /   HD   IMPLEMENTS OR APPARATUS FOR APPLYING PUSHING OR PULLING FORCE

134.3 R  DF  METHOD OR APPARATUS FOR PLACEMENT OF CONDUCTIVE WIRE {7}
134.5  DF  .~ Tractor for pulling wire (e.g., battery-powered) {1}
134.6.~.~ Step-by-step type (e.g., by camming against messenger)

DEFINITION

Classification: 254/134.6

Step-by-step type, (e.g., by camming against messenger):

(under subclass 134.5) Subject matter in which the tractor is provided with intermittent grip means for causing it to move in a stepwise fashion.

(1) Note. For example, by jerking on the accessible portion of the cable, the tractor may be caused, through the use of spring energy devices and suitable mechanical movements, to crawl along a messenger in steps.

SEE OR SEARCH CLASS

74, Machine Element or Mechanism,

84, for mechanisms for converting reciprocating motion into intermittent unidirectional motion.

226, Advancing Material of Indeterminate Length,

120, for means to advance material in a step-by-step manner.