spricsings

Claim 1

IN APPARATUS FOR COLLECTING CURRENT FROM AN ELECTRIC POWER LINE FOR TRANSMISSION THEREOF TO A MOBILE UNIT, AN UPRIGHT BASE HAVING A PAIR OF COMPLEMENTARY PARTS ELECTRICALLY INSULATED FROM ONE ANOTHER AND MOVABLE RELATIVE TO ONE ANOTHER ABOUT THE VERTICALLY EXTENDING PRINCIPAL AXIS OF SAID BASE, AN ARM HAVING A TOP WALL AND A PAIR OF SPACED APART SIDEWALLS DEPENDING THEREFROM WITH A FRONT WALL BRIDGING BETWEEN THE SAID SIDEWALLS, SAID ARM EXTENDING LATERALLY FROM SAID BASE AND CONNECTED PROXIMATE ITS REAR END TO ONE OF SAID PARTS FOR PIVOTAL MOVEMENT ABOUT A HORIZONTAL AXIS AND FOR PIVOTAL MOVEMENT ABOUT SAID VERTICALLY EXTENDING PRINCIPAL AXIS, A CONTACT SHOE MOUNTED UPON THE FREE END PORTION OF SAID ARM AND ADAPTED FOR OPERATION IN CONTACT WITH THE POWER LINE THROUGHOUT THE RANGE OF PIVOTAL MOVEMENT OF SAID ARM, AN ELONGATED COIL TENSION SPRING ANCHORED AT ONE END AT A POINT ABOVE THE HORIZONTAL AXIS FOR ARM PIVOTAL MOVEMENT TO THE ONE OF SAID COMPLEMENTARY PARTS CONNECTING TO SAID ARM AND EXTENDING FORWARD BENEATH AND BETWEEN THE ARM TOP WALL AND SIDEWALLS RESPECTIVELY TOWARD THE ARM FRONT WALL, A THREADED BORE PLUG DISPOSED WITHIN AND SECURED TO THE FORWARD EXTENDING END OF THE SAID COIL SPRING WITH THE THREADED BORE SUBSTANTIALLY AXIALLY ALIGNED WITH THE COIL SPRING LONG AXIS, A REARWARDLY EXTENDING THREADED BOLT PROJECTED THROUGH THE ARM FRONT WALL AND INTO THREADED ENGAGEMENT WITH THE PLUG BORE FOR VARIABLY STRETCHING THE SPRING TO ADJUST THE TENSION THEREOF TO BIAS SAID ARM AND CONTACT SHOE UPWARDLY FOR CONTACT OF THE LATTER WITH THE UNDERSURFACE OF SAID POWER LINE, AND A SHUNT DEPENDING FROM SAID CONTACT SHOE FOR CONDUCTING THE ELECTRIC CURRENT AROUND SAID ARM, WHEREBY THE LATTER IS BYPASSED.