US PATENT SUBCLASS 191 / 75
.~.~.~.~ Spiral cam replacer

Current as of: June, 1999
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191 /   HD   ELECTRICITY: TRANSMISSION TO VEHICLES

45 R  DF  COLLECTORS {8}
50  DF  .~ Trolley {10}
72  DF  .~.~ Guards and finders {3}
73  DF  .~.~.~ Constantly operative {3}
75.~.~.~.~ Spiral cam replacer

DEFINITION

Classification: 191/75

(under subclass 73) Trolley guards and finders of the constantly operative type consisting of conical members placed at the side of the regular trolley wheel and coaxial therewith. The surfaces of these cones are provided with spiral grooves leading toward the regular wheel, so that the displaced wire falling upon the conical member will be carried back onto the wheel.