Refrigeration control apparatus with time delay means

Claim 1

IN A CONTROL SYSTEM FOR A REFRIGERATION SYSTEM TO PREVENT SHORT CYCLING OF A MOTOR COMPRESSOR, A THERMOSTATIC SWITCH IN A SPACE IN WHICH THE TEMPERATURE IS BEING CONTROLLED, A MOTOR COMPRESSOR REFRIGERATION APPARATUS FOR COOLING THE SPACE, A SOURCE OF POWER, A TIMING MEANS CONNECTING SAID MOTOR COMPRESSOR THROUGH SAID SWITCH TO SAID SOURCE FOR PROVIDING A DELAY IN THE OPERATION OF SAID MOTOR AFTER SAID SWITCH IS CLOSED AND A LONGER DELAY AFTER SAID SWITCH OPENS BEFORE A SUBSEQUENT OPERATION CAN TAKE PLACE UPON THE CLOSING OF SAID SWITCH, SAID TIMING MEANS COMPRISING: A FIRST UNIJUNCTIONAL TRANSISTOR HAVING TWO BASE ELECTRODES AND AN EMITTER ELECTRODE, A FIRST RELAY MEANS ADAPTED TO CONTROL SAID MOTOR COMPRESSOR HAVING AN ENERGIZATION WINDING AND A PLURALITY OF SWITCH MEANS OPERATED THEREBY, A SECOND UNIJUNCTIONAL TRANSISTOR HAVING TWO BASE ELECTRODES AND AN EMITTER ELECTRODE, A SECOND RELAY MEANS HAVING AN ENERGIZATION WINDING AND TWO NORMALLY OPEN SWITCHES, CIRCUIT MEANS CONNECTING SAID ENERGIZATION WINDING OF SAID FIRST RELAY MEANS TO SAID SOURCE OF POWER THROUGH SAID THERMOSTAT AND A CIRCUIT OF SAID BASE ELECTRODES OF SAID FIRST TRANSISTOR AND ONE OF SAID NORMALLY OPEN SWITCHES OF SAID SECOND RELAY, A HOLDING CIRCUIT FOR SAID FIRST RELAY MEANS, A CONTROL CIRCUIT FOR SAID FIRST TRANSISTOR CONNECTED TO SAID EMITTER TO CAUSE SAID FIRST TRANSISTOR TO BECOME CONDUCTIVE AFTER A FIRST PREDETERMINED PERIOD OF TIME AFTER SAID THERMOSTAT CLOSES, CIRCUIT MEANS CONNECTING SAID ENERGIZING WINDING OF SAID SECOND RELAY TO SAID SOURCE THROUGH A CIRCUIT OF SAID BASE ELECTRODES OF SAID SECOND TRANSISTOR AND ANOTHER OF SAID PLURALITY OF SWITCHES, A SECOND CONTROL CIRCUIT FOR SAID SECOND TRANSISTOR CONNECTED TO SAID EMITTER TO CAUSE SAID TRANSISTOR TO BECOME CONDUCTIVE AFTER A SECOND PREDETERMINED PERIOD, AND A HOLDING CIRCUIT MEANS CONNECTING A SECOND SWITCH OF SAID SECOND RELAY IN PARALLEL WITH SAID BASE ELECTRODES OF SAID SECOND TRANSISTOR TO MAINTAIN SAID SECOND RELAY ENERGIZED.