Self-adjusting load responsive brake

Claim 1

IN A HOIST SYSTEM INCLUDING A ROTATING SHAFT CONNECTED TO HOIST LOAD MEANS AT ONE PORTION THEREOF AND HOIST MOTOR MEANS AT THE OTHER END THEREOF; A LOADSENSITIVE BRAKE COMPRISING A ROTATABLE BRAKE DRUM CONNECTED TO SAID SHAFT, A BRAKE SHOE MOVABLE INTO AND OUT OF BRAKE ENGAGEMENT WITH SAID BRAKE DRUM, A BRAKE SHOE SUPPORT ARM PIVOTALLY MOUNTED AT ONE END THEREOF, A LOAD-RESPONSIVE LINK PIVOTALLY CONNECTED AT ONE END THEREOF TO SAID BRAKE SHOE SUPPORT ARM AND PIVOTALLY CONNECTED AT THE OTHER END THEREOF TO SAID BRAKE SHOE; STOP MEANS CONNECTED TO SAID BRAKE SHOE SUPPORT ARM FOR LIMITING THE ROTATION OF SAID LOAD-RESPONSIVE LINK ABOUT ITS SAID PIVOTAL CONNECTION TO SAID BRAKE SHOE SUPPORT ARM, ELECTRICAL CIRCUIT SWITCH OPERATING MEANS POSITIONED ADJACENT SAID STOP MEANS WHEREBY SAID ELECTRICAL CIRCUIT SWITCH OPERATING MEANS IS OPERATED WHEN SAID LOAD-RESPONSIVE LINK REACHES SAID STOP MEANS, BIASING MEANS FOR NORMALLY BIASING SAID BRAKE SHOE IN ENGAGEMENT WITH SAID BRAKE DRUM, ELECTRICALLY ENERGIZABLE BRAKE RELEASE MEANS CONNECTED TO SAID BRAKE SHOE FOR MOVING SAID BRAKE SHOE OUT OF ENGAGEMENT WITH SAID BRAKE DRUM, ELECTRICAL CIRCUIT MEANS INCLUDING SWITCH MEANS CONNECTED TO SAID SWITCH OPERATING MEANS FOR ENERGIZING SAID BRAKE RELEASE MEANS; SAID LOAD-RESPONSIVE LINK ENGAGING SAID STOP MEANS AND SAID ELECTRICAL CIRCUIT SWITCH OPERATING MEANS WHEN THE TORQUE OF SAID LOAD MEANS EXCEEDS THE OPPOSING TORQUE OF SAID HOIST MOTOR MEANS WHEREBY SAID SWITCH MEANS PRECENTS ENERGIZATION OF SAID BRAKE RELEASE MEANS; SAID SWITCH OPERATING MEANS BEING MOVED TO A CIRCUIT ENERGIZING POSITION ONLY WHEN SAID LOAD-RESPONSIVE LINK MOVES AWAY FROM SAID STOP MEANS AND RELEASES SAID ELECTRICAL CIRCUIT SWITCH OPERATING MEANS.