Emergency air brake actuating mechanism for truck trailers

Claim 1

MECHANICAL ACTUATING MEANS FOR EMERGENCY OPERATION OF A TRACK TRAILER TYPE AIR BRAKE SYSTEM COMPRISING A LEVER JOURNALED ON A BRAKE ACTUATING SHAFT OF SUCH SYSTEM AND ADJACENT A BRAKE ARM OF SUCH SYSTEM SECURED TO SUCH SHAFT, A PORTION OF THE LEVER FORMED AND POSITIONED TO OPERATIVELY ENGAGE AND MOVE SUCH BRAKE ARM TOWARD BRAKE SETTING POSITION UPON JOURNAL MOVEMENT OF THE LEVER IN ONE DIRECTION, AND TO SWING FREE OF OPERATIVE ENGAGEMENT WITH SUCH BRAKE ARM UPON JOURNAL MOVEMENT OF THE LEVER IN THE OPPOSITE DIRECTION, MEANS OPERATIVELY CONNECTING A FREE END OF THE LEVER TO A PRIMARY AIR POT OF SUCH SYSTEM FOR JOURNAL MOVEMENT OF THE LEVER AND ITS BRAKE ARM ENGAGING PORTION IN SAID ONE DIRECTION TO BRAKE SETTING POSITION WITHIN NORMAL LIMITS UPON ACTUATION OF SUCH PRIMARY AIR POT, AN EMERGENCY AIR POT COMMUNICATING WITH A COMPRESSED AIR SUPPLY OF SUCH SYSTEM TO BE PRESSURIZED AND HELD IN ACTUATED POSITION WHEN SUCH SYSTEM IS PRESSURIZED TO BRAKE OPERATING CONDITION. BIASING MEANS OPPOSING AIR ACTUATION OF THE EMERGENCY AIR POT, SAID BIASING MEANS BEING POWERFUL ENOUGH FOR EMERGENCY ACUTUATION OF SUCH BRAKE SYSTEM, AND LESS POWERFULL THAN THE EMERGENCY AIR POT WHEN THE LATTER IS PRESSURIZED BY COMPRESSED AIR FROM SUCH SYSTEM AT BRAKE OPERATING PRESSURE, AND TENSION TRANSMITTING MEANS OPERATIVELY INTERCONNECTING THE BIASING MEANS WITH SUCH BRAKE ARM, SAID TENSION TRANSMITTING MEANS WITH SUCH BRAKE ARM, SAID TENSION THE EMERGENCY AIR POT BY PRESSURIZATION THEREOF AT BRAKE OPERATING PRESSURE, AND BEING TENSIONED BY THE BIASING MEANS UPON LOSS OF PRESSURIZATION OF THE EMERGENCY AIR POT TO MOVE SUCH BRAKE ARM AWAY FROM OPERATIVE ENGAGEMENT WITH THE LEVER PORTION TO EMERGENCY BRAKE SETTING POSITION BEYOND ITS SAID NORMAL LIMITS OF OPERATING.