Automatic control for battery charger

Claim 1

AN AUTOMATIC CONTROL FOR A BATTERY CHARGER COMPRISING, A VOLTAGE SENSITIVE RELAY WINDING ADAPTED FOR CONNECTION ACROSS THE TERMINALS OF A BATTERY, SAID VOLTAGE SENSITIVE RELAY WINDING HAVING A PAIR OF NORMALLY OPEN VOLTAGE SENSITIVE SWITCH CONTACTS OPERATED BY SAID VOLTAGE SENSITIVE RELAY WINDING, A TIME DELAY RELAY WINDING ADAPTED FOR CONNECTION ACROSS THE TERMINALS OF A BATTERY AND PARALLEL WITH SAID VOLTAGE SENSITIVE RELAY WINDING, SAID TIME DELAY RELAY WINDING HAVING FIRST AND SECOND PAIRS OF NORMALLY CLOSED TIME DELAY SWITCH CONTACTS OPERATED DIRECTLY BY SAID TIME DELAY RELAY WINDING, SAID VOLTAGE SENSITIVE SWITCH CONTACTS CONNECTED IN SERIES WITH SAID TIME DELAY RELAY WINDING AND OPERABLE IN RESPONSE TO THE ENERGIZATION OF SAID VOLTAGE SENSITIVE RELAY WINDING TO ENERGIZE SAID TIME DELAY RELAY WINDING WHEN SAID VOLTAGE SENSITIVE RELAY WINDING IS ENERGIZED, SAID FIRST PAIR OF TIME DELAY SWITCH CONTACTS OPERABLE IN RESPONSE TO THE ENERGIZATION OF SAID TIME DELAY RELAY WINDING AND ADAPTED WHEN SO ACTUATED TO SHUT OFF THE BATTERY CHARGER, A FIRST VARIABLE RESISTANCE MEANS CONNECTED IN SERIES WITH SAID VOLTAGE SENSITIVE RELAY WINDING AND ADAPTED TO ADJUST THE MAXIMUM CONTROL VOLTAGE AT WHICH THE VOLTAGE SENSITIVE RELAY WINDING WILL BE ENERGIZED, A SECOND VARIABLE RESISTANCE MEANS CONNECTED SERIES WITH SAID VOLTAGE SENSITIVE RELAY WINDING AND ADAPTED FOR ADJUSTMENT OF THE MINIMUM CONTROL VOLTAGE AT WHICH SAID VOLTAGE SENSITIVE RELAY WINDING WILL DROP OUT AFTER ONCE BEING ENERGIZED, AND A SHUNT CIRCUIT MEANS FOR SHUNTING SAID SECOND VARIAABLE RESISTANCE MEANS, SAID SHUNT MEANS INCLUDING SAID SECOND PAIR OF TIME DELAY SWITCH CONTACTS, SAID SECOND SWITCH CONTACTS ADAPTED WHEN ACTUATED TO OPEN SAID SHUNT CIRCUIT AND THEREBY INTRODUCE THE RESISTANCE OF SAID SECOND VARIABLE RESISTANCE MEANS INTO THE VOLTAGE SENSITIVE RELAY WINDING CIRCUIT.