French etal brake mechanism

Claim 1

FOR USE WITH A MANUALLY ACTUATABLE CONTROL ADAPTER TO OPERATE A PRESSURE PRODUCING APPARATUS HAVING A FLUID PRESSURE SOURCE, A FLUID PRESSURE MOTOR IN COMMUNICATION WITH THE FLUID PRESSURE SOURCE, THE MOTOR INCLUDING A PRESSURE RESPONSIVE DEVICE DIVIDING A PORTION OF THE FLUID PRESSURE MOTOR IN OPPOSING FLUID PRESSURE CHAMBERS WITH THE PRESSURE RESPONSIVE DEVICE CONNECTED TO THE MANUALLY ACTUATABLE CONTROL TO MOVE THE CONTROL BETWEEN A NORMAL LOW POSITION AND AN EMERGENCY HIGH POSITION, AND MEANS COMMUNICATING A PRESSURIZED FLUID TO ONE OF THE OPPOSING CHAMBERS AND AUTOMATICALLY CONTROLLING THE DIFFERENTIAL PRESSURE BETWEEN THE OPPOSING CHAMBERS IN SUCH MANNER AS TO HOLD THE MANUALLY ACTUATABLE CONTROL IN THE LOW POSITION WHEN THE PRESSURIZED FLUID IS BEING SUPPLIED AND TO RAISE THE MANUALLY ACTUATABLE CONTROL TO THE HIGH POSITION WHEN SAID PRESSURIZED FLUID SUPPLY FALLS OFF, A MEANS TO SENSE THE FALLING OFF OF THE FLUID PRESSURE SOURCE AND CONTROL THE FLUID PRESSURE SOURCE''S COMMUNICATION WITH THE SAID FLUID PRESSURE MOTOR WHICH MEANS COMPRISES: A SLIDE VALVE RESPONSIVE TO SAID PRESSURE RESPONSIVE DEVICE; A MEANS COMMUNICATING THE FLUID PRESSURE SOURCE TO SAID SLIDE VALVE; AND A RESILIENT MEMBER OPERATIVELY ARRANGED TO NORMALLY BIAS SAID SLIDE VALVE TO NORMALLY COMMUNICATE SAID FLUID PRESSURE SOURCE TO SAID FLUID PRESSURE MOTOR WHICH RESILIENT MEANS IS ADAPTED TO OPPOSE SAID PRESSURE RESPONSIVE DEVICE WHEN SAID PRESSURE RESPONSIVE DEVICE MOVES IN A DIRECTION TO CAUSE SAID SLIDE VALVE TO TERMINATE SUCH COMMUNICATION.