Safety control device

Claim 1

A SAFETY CONTROL DEVICE FOR USE WITH A BURNER MECHANISM COMPRISING, IN COMBINATION, A FLAME SENSING MEANS FOR DETECTING PREDETERMINED FLAME CONDITIONS OF A BURNER MECHANISM, A CONTROL UNIT CONNECTED WITH SAID SENSING MEANS INCLUDING A FIRST RELAY FOR TERMINATING THE OPERATION OF SAID BURNER MECHANISM IN THE ABSENCE OF A FLAME, A SECOND RELAY FOR TERMINATING THE OPERATION OF SAID BURNER MECHANISM IN RESPONSE TO THE FLAME OF SAID BURNER MECHANISM EXCEEDING A PREDETERMINED COMBUSTION RATE, SAID FIRST RELAY COMPRISING AN ACTUATING COIL, A CONTACT, AND AN ARMATURE ENGAGING THE CONTACT WHEN THE RELAY IS DEACTIVATED; SAID SECOND RELAY COMPRISING AN ACTUATING COIL, A CONTACT, AND AN ARMATURE ENGAGING THE CONTACT WHEN THE RELAY IS ACTIVATED; MEANS ACTIVATING SAID FIRST RELAY DURING THE OPERATION OF SAID BURNER MECHANISM UPON THE DETECTION OF A FLAME BY SAID SENSING MEANS AND ACTIVATING SAID SECOND RELAY DURING THE OPERATION OF SAID BURNER WHEN THE FLAME OF SAID BURNER MECHANISM EXCEEDS A PREDETERMINED COMBUSTION RATE; A DELAY RELAY CONNECTED WITH THE CONTACTS OF SAID FIRST AND SECOND RELAYS FOR TERMINATING THE OPERATION OF SAID BURNER MECHANISM A PREDETERMINED TIME AFTER THE DEACTIVATION OF SAID FIRST RELAY OR THE ACTIVATION OF SAID SECOND RELAY, SAID DELAY RELAY COMPRISING A HEATING ELEMENT, A CONTACT AND AN ARMATURE NORMALLY DISENGAGING SAID CONTACT AND ENGAGING SAID CONTACT A PREDETERMINED TIME AFTER ITS HEATING ELEMENT IS ENERGIZED, MEANS CONNECTED WITH THE HEATING ELEMENT OF SAID DELAY RELAY AND COMPLETING A CIRCUIT FOR ENERGIZING SAID DELAY RELAY DURING THE OPERATION OF SAID BURNER THROUGH EITHER OF THE ARMATURES OF SAID FIRST AND SECOND RELAYS IN ENGAGEMENT WITH ITS RESPECTIVE CONTACT, A SHUT OFF RELAY FOR THE BURNER MECHANISM HAVING AN ACTUATING COIL CONNECTED WITH THE CONTACT OF SAID DELAY RELAY FOR ENERGIZATION, AND AN ARMATURE HAVING FIRST AND SECOND POSITIONS; THE ACTUATING COIL OF SAID SHUT OFF RELAY BEING ENERGIZED BY THE COMPLETION OF ITS CIRCUIT THROUGH THE CONTACT AND ARMATURE OF SAID DELAY RELAY; SAID SHUT OFF RELAY UPON ENERGIZATION ACTUATING ITS ARMATURE TO ITS SECOND POSITION TO TERMINATE THE OPERATION OF SAID BURNER MECHANISM, A NORMALLY OPEN RESET SWITCH HAVING AN OPEN POSITION AND A CLOSED POSITION, A RESET RELAY INCLUDING AN ACTUATING COIL CONNECTED WITH SAID RESET SWITCH FOR ENERGIZATION, AND AN ARMATURE HAVING FIRST AND SECOND POSITIONS; SAID RESET RELAY BEING ENERGIZED WHEN SAID RESET SWITCH IS PLACED IN ITS CLOSED POSITION; THE ARMATURE OF SAID RESET RELAY ASSUMING ITS FIRST POSITION UPON ENERGIZATION OF SAID RESET RELAY; THE ARMATURE OF SAID RESET RELAY BEING COUPLED WITH THE ARMATURE OF SAID SHUT OFF RELAY SO THAT THE ARMATURE OF SAID SHUT OFF RELAY ASSUMES ITS FIRST POSITION WHEN SAID RESET RELAY IS ENERGIZED AND THE ARMATURE OF SAID RESET RELAY ASSUMES ITS SECOND POSITION WHEN SAID SHUT OFF RELAY IS ENERGIZED.