Pointer lock for electrical indicating instruments

Claim 1

A POINTER LOCK FOR INDICATING INSTRUMENTS COMPRISING, IN COMBINATION: (A) A CASING, (B)D A VISUALLY EXPOSED SCALE CARRIED BY SAID CASING AND SUBTENDING A PREDETERMINED SCALE ANGLE OF ARC ABOUT A PIVOTING AXIS PASSING THROUGH THE CASING, (C) A METER MOVEMENT CARRIED BY SAID CASING, AND INCLUDING (1) A PIVOTALLY MOUNTED DISK HAVING AN ELONGATED RADIAL POINTER MOVABLE IN INDICATING RELATION TO SAID SCALE, AND (2) AXIAL MOUNTING MEANS FOR MOUNTING THE ROTOR DISK IN THE CASING FOR SUBSTANTIALLY FRICTIONLESS PIVOTING MOVEMENT ABOUT SAID PIVOTING AXIS, (D) LOCKING SPRING MEANS INCLUDING (1) A FIRST SPRING ANCHORED AT ONE END IN SAID CASING FOR FLEXING MOVEMENT PARALLEL TO THE PLANE OF SAID DISK AND HAVING ITS FREE END LATERALLY OPPOSED TO THE PERIPHERY OF SAID DISK, AND (2) A SECOND SPRING SECURED TO THE DISK SIDE OF SAID FIRST SPRING EXTENDING PERPENDICLARLY TO THE PLANE OF SAID DISK FOR ENGAGEMENT WITH THE PERIPHERY OF SAID DISK AT AN INTERMEDIATE POINT OF SAID SECOND SPRING UPON MOVEMENT OF SAID FIRST SPRING TOWARD SAID DISK, (E) A FITTING MOUNTED IN SAID CASING HAVING A PASSAGE OPENING TO THE INTERIOR AND EXTERIOR OF SAID CASING WITH ITS AXIS DISPOSED AT ONE SIDE OF SAID FIRST SPRING, AND (F) A FLEXIBLE CABLE RELEASE UNIT CONNECTABLE TO SAID FITTING EXTERNALLY OF SAID CASING AND INCLUDING (1) A PIN AT ONE END OF SAID CABLE RELEASE UNIT ADAPTED TO HAVE PROJECTING AND RETRACTING MOVEMENT IN SAID PASSAGE AND HAVING A TIP WHICH UPON PROJECTION OF SAID PIN ENGAGES AT ONE SIDE OF SAID FIRST SPRING TO MOVE IT LATERALLY AGAINST THE INHERENT TENSION OF SAID FIRST SPRING FROM A NORMAL TO AN ACTUATED POSITION, WHEREBY IN ONE OF SAID POSITIONS SAID SECOND SPRING IS IN LOCKING ENGAGEMENT WITH THE PERIPHERY OF SAID DISK AND IN THE OTHER OF SAID POSITIONS SAID SECOND SPRING IS IN SEPARATED NON-LOCKING POSITION RELATIVELY TO SAID PERIPHERY, AND (2) AN ACTUATING PLUNGER AT THE OTHER END OF SAID CABLE RELEASE UNIT FOR IMPARTING PROJECTING AND RETRACTING MOVEMENT TO SAID PIN.