Patent ID: 7947913

Claim:
A slide bar interlocking device, comprising: a first group of switch actuators and a second group of switch actuators; each switch actuator in said second group of switch actuators being unconstrained so that any switch actuator in said second group and any combination of switch actuators in said second group can be thrown at any time; each switch actuator in said first group of switch actuators being constrained when any preselected switch actuator in said first group is unconstrained so that only one unconstrained switch actuator in said first group may be thrown in combination with any switch actuator in said second group and any combination of switch actuators in said second group; a base plate having a fixed position; a movable plate that is slideably mounted to said base plate; a plurality of elongate slots formed in said movable plate; at least one truncate slot formed in each of said elongate slots in open communication therewith and in normal relation thereto; said movable plate having a first position where a first switch actuator in said first group of switch actuators is in alignment with a first truncate slot so that said first switch actuator can be thrown and where all other switch actuators in said first group of switch actuators are not in alignment with a truncate slot so that none of said all other switch actuators can be thrown; said movable plate having a second position where a second switch actuator in said first group of switch actuators is in alignment with a second truncate slot so that said second switch actuator can be thrown and where all other switch actuators in said first group of switch actuators are not in alignment with a truncate slot so that none of said all other switch actuators can be thrown; said movable plate having a third position where a third switch actuator in said first group of switch actuators is in alignment with a third truncate slot so that said third switch actuator can be thrown and where all other switch actuators in said first group of switch actuators are not in alignment with a truncate slot so that none of said all other switch actuators can be thrown.