Plural battery and plural motor control system for industrial truck

Claim 1

IN AN INDUSTRIAL TRUCK HAVING A TRACTION WHEEL AND AN ELECTRIC TRACTION MOTOR FOR DRIVING SAID WHEEL, AN OPERATOR CONTROL OPERATIVELY CONNECTED TO THE MOTOR FOR CONTROLLING FIRST AND SECOND MOTOR SPEEDS, SAID OPERATIVE CONNECTION INCLUDING CONTROLLER MEANS AND CIRCUIT MEANS, MOVEMENT OF SAID OPERATOR CONTROL ACTUATING SAID CONTROLLER MEANS TO CONDITION SAID CIRCUIT MEANS FOR FIRST SPEED OPERATION WHEREIN NORMALLY CLOSED SWITCH MEANS IN THE POWER CIRCUIT TO SAID MOTOR MEANS IS ACTUATED TO AN OPEN POSITION, RESISTOR MEANS IN PARALLEL WITH SAID SWITCH MEANS CONTROLLING SAID FIRST MOTOR SPEED, ACTUATION OF SAID OPERATOR CONTROL TO SAID SECOND SPEED POSITION ACTUATING SAID CONTROLLER MEANS TO CONDITION SAID CIRCUIT SUCH THAT SAID NORMALLY CLOSED SWITCH MEANS CLOSES WHEREBY TO BYPASS SAID RESISTOR MEANS FOR MOTOR OPERATION IN SAID SECOND SPEED, AND A RECTIFIER PARALLELING SAID SWITCH MEANS FOR MOMENTARILY MAINTAINING THE SWITCH MEANS IN AN ENERGIZED OPEN POSITION FOLLOWING DE-ENERGIZATION THEREOF BY CONTROLLER MEANS DURING A TRANSIENT SPEED CONDITION BETWEEN THE FIRST AND SECOND MOTOR SPEEDS, WHEREBY SAID RECTIFIER AND SWITCH MEANS SUBSTANTIALLY REDUCE CURRENT PEAKS AT SAID MOTOR DURING RAPID MOVEMENT OF THE OPERATOR CONTROL FROM A NEUTRAL POSITION THROUGH THE FIRST SPEED POSITION TO THE SECOND SPEED POSITION.