Brake means

Claim 1

A DEVICE OF THE CLASS DESCRIBED INCLUDING A ROTATABLE SHAFT, AN ARMATURE MOUNTED TO SAID SHAFT AND HAVING A CONCIAL SURFACE CONCENTRIC WITH THE LONGITUDINAL AXIS OF SAID SHAFT, A SPRING BIASING SAID ARMATURE TO A FIRST POSI TION, AN ELECTROMAGNET FOR MOVING SAID ARMATURE ALONG SAID AXIS TO SECOND POSITION, A BRAKE DRUM KEYED TO SAID SHAF, A PLURALITY OF BRAKE SHOE CARRYING FINGERS ARRANGED IN A CIRCULAR ARRAY ABOUT SAID AXIS AS A CENTER AND EXTENDING GENERALLY PARALLEL THERETO, SAID FINGERS INTERPOSED BETWEEN SAID CONICAL SURFACE AND SAID BRAKE DRUM, BALL MEANS INTERPOSED BETWEEN AND INDIRECT CONTACT WITH SAID FINGERS AND SAID CONICAL SURFACE IN DIRECT CONTACT WITH EACH, SAID ARMATURE UPON MOVEMENT TO SAID SECOND POSITION HAVING ITS SAID CONICAL SURFACE DRIVE SAID BALLS AGAINST SAID FINGERS THEREBY TRANSMITTING FORCE COMPONENTS WHICH DRIVE SAID BRAKE SHOES AGAINST SAID BRAKE DRUM TO HALT ROTATION OF SAID SHAFT.