Burner ignition system having safety switch with remote reset

Claim 2

An electric ignition system comprising means for generating sparks, flame sensing means for terminating operation of the spark generating means when a flame is sensed, a safety switch having a pair of normally closed contacts and a resistance heat motor serially connected with the spark generating means, said resistance heat motor capable of opening the closed contacts when the flame sensing means fails to sense a flame after a predetermined duration of operation of the spark generating means, said safety switch including electromagnetic means for resetting the contacts in a closed position, switch means disposed at a location remote from the ignition circuit for energizing the electromagnetic means, a transformer having a secondary winding, said spark generating means being energized by the secondary winding of the transformer, and said electromagnetic means being in series with the switch means across the secondary winding of the transformer.

Claim 3

An electric ignition system comprising means for generating sparks, flame sensing means for terminating operation of the spark generating means when a flame is sensed, a safety switch having a pair of normally closed contacts and a resistance heat motor serially connected with the spark generating means, said resistance heat motor capable of opening the closed contacts when the flame sensing means fails to sense a flame after a predetermined duration of operation of the spark generating means, said safety switch including electromagnetic means for resetting the contacts in a closed position, switch means disposed at a location remote from the ignition circuit for energizing the electromagnetic means, said safety switch including a pushbutton manually depressible for resetting the safety switch, and said electromagnetic means including a lever engaging the pushbutton, an armature connected to the lever, and an electric coil which is energized by the switch means to attract the armature to move the lever to depress the pushbutton.

Claim 4

An electric ignition system comprising means for generating sparks, flame sensing means for terminating operation of the spark generating means when a flame is sensed, a safety switch having a pair of normally closed contacts and a resistance heat motor serially connected with the spark generating means, said resistance heat motor capable of opening the closed contacts when the flame sensing means fails to sense a flame after a predetermined duration of operation of the spark generating means, said safety switch including electromagnetic means for resetting the contacts in a closed position, switch means disposed at a location remote from the ignition circuit for energizing the electromagnetic means, said safety switch including a pushbutton manually depressible for resetting the safety switch, and said electromagnetic means including a lever engaging the pushbutton, an armature connected to the lever, and an electric coil which is energized by the switch means to attract the armature to move the lever to depress the pushbutton.

Claim 5

An electric ignition system for a burner comprising a first transformer having a first primary winding and a first secondary winding; a safety switch having a resistance heat motor and first and second normally closed contacts which are opened when the resistance heat motor senses a current for an excessive duration; said safety switch having means for holding the first and second contacts open after the resistance heat motor has operated and pushbutton means for resetting the first and second contacts closed when the pushbutton means is depressed; said first contact connected to a first tap of the first secondary winding; a first coil; an ignition circuit including the resistance heat motor and a silicon controlled rectifier serially connected with the first coil and the anode and cathode electrodes of the silicon controlled rectifier between the second contact and a second tap of the first secondary winding; a thermostat switch Connected at one side to the second contact; a trigger circuit connected between the other side of the thermostat switch and a gate electrode of the silicon controlled rectifier; flame sensing means for disabling the trigger circuit when the presence of a flame from the burner is sensed; a second coil connected in a circuit between the other side of the thermostat switch and the second tap; fuel control means for the burner; said fuel control means capable of being changed from an unoperated condition to an operated condition when both the first and second coils are energized; said fuel control means capable of being maintained in an operated condition when only the second coil is energized; said fuel control means being returned to the unoperated condition in the absence of energization of both the first and second coils; said safety switch having a third coil, an armature, a pivotally mounted lever for engaging the pushbutton means, and linkage means connecting the lever to the armature; a push button switch mounted in a location remote from the safety switch; and circuit means connecting the pushbutton switch in series with the third coil across at least a portion of the first secondary winding.

Claim 6

An electric ignition system for a burner comprising a first transformer having a first primary winding and a first secondary winding; a safety switch having a resistance heat motor and first and second normally closed contacts which are opened when the resistance heat motor senses a current for an excessive duration; said safety switch having means for holding the first and second contacts open after the resistance heat motor has operated and pushbutton means for resetting the first and second contacts closed when the pushbutton means is depressed; said first contact connected to a first tap of the first secondary winding; a first coil; an ignition circuit including the resistance heat motor and a silicon controlled rectifier serially connected with the first coil and the anode and cathode electrodes of the silicon controlled rectifier between the second contact and a second tap of the first secondary winding; a thermostat switch Connected at one side to the second contact; a trigger circuit connected between the other side of the thermostat switch and a gate electrode of the silicon controlled rectifier; flame sensing means for disabling the trigger circuit when the presence of a flame from the burner is sensed; a second coil connected in a circuit between the other side of the thermostat switch and the second tap; fuel control means for the burner; said fuel control means capable of being changed from an unoperated condition to an operated condition when both the first and second coils are energized; said fuel control means capable of being maintained in an operated condition when only the second coil is energized; said fuel control means being returned to the unoperated condition in the absence of energization of both the first and second coils; said safety switch having a third coil, an armature, a pivotally mounted lever for engaging the pushbutton means, and linkage means connecting the lever to the armature; a push button switch mounted in a location remote from the safety switch; and circuit means connecting the pushbutton switch in series with the third coil across at least a portion of the first secondary winding.