Temperature control device

Claim 1

A PNEUMATIC TEMPERATURE CONTROL DEVICE COMPRISING: A SOURCE FOR SUPPLYING PNEUMATIC FLUID AT A FIRST PREDETERMINED PRESSURE TO INITIATE A FIRST TEMPERATURE CONTROL MODE AND AT A SECOND PREDETERMINED PRESSURE TO INITIATE A SECOND TEMPERATURE CONTROL MODE; MEANS FOR COMMUNICATING PRESSURE SIGNALS FROM SAID TEMPERATURE CONTROL DEVICE; A FIRST TEMPERATURE RESPONSIVE VALVE ADAPTED WHEN ACTIVATED TO EFFECT A CONTROL PRESSURE SIGNAL WHICH IS A FUNCTION OF AMBIENT TEMPERATURE AND INDICATIVE OF SAID FIRST TEMPERATURE CONTROL PRESSURE MODE; A SECOND TEMPERATURE RESPONSIVE VALVE ADAPTED WHEN ACTIVATED TO EFFECT A CONTROL PRESSURE SIGNAL WHICH IS A FUNCTION OF TEMPERATURE AND INDICATIVE OF SAID SECOND TEMPERATURE CONTROL MODE; A CHANGE-OVER VALVE PROVIDED WITH MOTOR MEANS, SAID CHANGE-OVER VALVE BEING ADAPTED TO SELECTIVELY ACTIVATE SAID FIRST TEMPERATURE RESPONSIVE VALVE WHEN SAID MOTOR MEANS ARE NOT SUBJECT TO SUPPLY LINE PRESSURE, SAID CHANGE OVER VALVE BEING FURTHER ADAPTED TO SELECTIVELY ACTIVATE SAID SECOND TEMPERATURE RESPONSIVE VALVE WHEN SAID MOTOR MEANS ARE SUBJECT TO SUPPLY PRESSURE; PRESSURE SENSITIVE SWITCHING MEANS CONNECTED TO SAID SOURCE; AND OVERRIDE MEANS CONNECTING SAID PRESSURE SENSITIVE SWITCHING MEANS AND SAID CHANGE-OVER VALVE MOTOR MEANS AND ADAPTED TO PROVIDE COMMUNICATION THEREBETWEEN WHEN NOT ACTUATED, SAID SWITCHING MEANS BEING RESPONSIVE TO SAID SECOND PREDETERMINED SUPPLY PRESSURE TO COMMUNICATE THE SAME TO SAID CHANGE-OVER VALVE MOTOR MEANS THROUGH SAID OVERRIDE MEANS AND RESPONSIVE TO SAID FIRST PREDETERMINED SUPPLY PRESSURE TO VENT SAID OVERRIDE MEANS AND SAID CHANGE-OVER VALVE MOTOR MEANS, SAID OVERRIDE MEANS BEING ADAPTED TO BE EXTERNALLY ACTUATED TO BLOCK COMMUNICATION OF SUPPLY PRESSURE TO SAID CHANGE-OVER VALVE MOTOR MEANS AND SIMULTANEOUSLY VENT SAID MOTOR MEANS, SAID OVERRIDE MEANS BEING FURTHER ADAPTED TO RETURN TO NONACTUATED CONDITION WHEN VENTED BY SAID SWITCHING MEANS, SAID OVERRIDE MEANS COMPRISING A CASING PROVIDING A BORE VENTING AT ONE END, AN INLET PORT, A PRESSURE CHAMBER PROVIDING COMMUNICATION BETWEEN SAID INLET PORT AND SAID BORE AND AN OUTLET PORT COMMUNICATING WITH SAID BORE, A SELECTOR ROD DISPOSED IN SAID BORE AND LIMITED IN LONGITUDINAL TRAVEL THEREIN, SAID SELECTOR ROD HAVING A NOTCH PORTION, A LATCH MEMBER ADAPTED TO ENGAGE SAID NOTCH PORTION, A LATCH DIAPHRAGM AFFIXED TO SAID LATCH MEMBER, FIRST SPRING MEANS BIASING SAID SELECTOR ROD INTO A NONACTUATED POSITION BLOCKING COMMUNICATION OF SAID INLET AND OUTLET PORTS WITH SAID VENTING END OF SAID BORE AND ENABLING COMMUNICATION BETWEEN SAID INLET AND OUTLET PORTS, SECOND SPRING MEANS DISPOSED AND BIASING SAID LATCH DIAPHRAGM AND LATCH MEMBER INTO A POSITION PREVENTING ENGAGEMENT OF SAID LATCH MEMBER IN SAID NOTCH PORTION OF SAID SELECTOR ROD, SAID LATCH DIAPHRAGM BEING RESPONSIVE TO THE PRESENCE OF SUPPLY PRESSURE IN SAID PRESSURE CHAMBER TO CONDITION SAID LATCH MEMBER TO ENGAGE SAID NOTCH PORTION OF SAID SELECTOR ROD WHEN SAID NOTCH PORTION IS ALIGNED WITH SAID LATCH MEMBER BY THE APPLICATION OF EXTERNAL ACTUATING FORCE TO SAID SELECTOR ROD, SAID SELECTOR ROD BEING ADAPTED WHEN SAID NOTCH PORTION IS ENGAGED BY SAID LATCH MEMBER TO BLOCK COMMUNICATION BETWEEN SAID INLET PORT AND SAID OUTLET PORT AND TO ENABLE COMMUNICATION BETWEEN SAID OUTLET PORT AND SAID VENTING END OF SAID BORE.