Control system and unit for a cooking apparatus and the like

Claim 2

In a control system for a cooking oven having heating means, a source of electrical current, thermostatically operated switch means adapted to interconnect and disconnect said source to and from said heating means to tend to maintain a selected temperature output effect of said heating means in said oven when a selector means of said switch means is moved from an off position thereof to a selected on position thereof, the improvement comprising a timer operated switch means having a first position and a second position, said timer operated switch means having means for maintaining itself in its first position for a selected cooking time period and for automatically moving itself to its second position at the end of said time period and then back to its first position, relay switch means having a first position and a second position, and electrical circuit means operatively interconnecting said source with said heating means through said switch means, said relay switch means and said timer operated switch means when in said first positions cooperating together to interconnect said source to said heating means through said thermostAtically operated switch means when said thermostatically operates switch means is in an on position thereof, said timer operated switch means having means for causing said relay switch means to move to its second position when said timer operated switch means automatically moves to its second position, said timer operated switch means and said relay switch means cooperating together to thereafter maintain said relay switch means in its said second position even though said timer operated switch means automatically moves back to its first position until said thermostatically operated switch means is turned to its off position by said selector means whereby said relay switch means then automatically moves back to its said first position.

Claim 3

In a control system as set forth in claim 1, the further improvement wherein said timer operated switch means has means for selecting a delayed start time thereof that causes said timer operated switch means to remain in a third position thereof during said delayed start time period after the lapse of which said timer operated switch means is automatically moved to said first position thereof for said selected cooking time period, said timer operated switch means when in said third position preventing said source from being interconnected to said heating means through said circuit means.

Claim 4

In a control system as set forth in claim 2, the further improvement wherein said selector means can be set for a baking operation of said heating means whereby said heating means will provide a baking operation during said selected cooking time period after the lapse of said delayed start time period of said timer operated switch means.

Claim 5

In a control system as set forth in claim 3, the further improvement wherein said circuit means has another thermostatically operated switch means therein which is adapted to interconnect and disconnect said source to and from said heating to tend to maintain a warmth-retaining and noncooking temperature in said oven when said selector means is set in a warmth-retaining and noncooking setting thereof and said timer operated switch means and said relay switch means are in said first positions thereof.

Claim 6

In a control system as set forth in claim 4, the further improvement wherein said relay switch means and said timer operated switch means cooperate together to interconnect said source to said heating means through said other thermostatically operated switch means following the end of said selected cooking time period when said timer operated switch means is back in its first position and said relay switch means is in its second position until said selector means moves said first-named thermostatically operated switch means to its off position.

Claim 7

In a control system as set forth in claim 3, the further improvement wherein said selector means can be set for a broiling operation of said heating means whereby said heating means will provide a broiling operation during said selected cooking time period after the lapse of said delayed start time period of said timer operated switch means.

Claim 8

In a control system as set forth in claim 1, the further improvement wherein said relay switch means when in said second position thereof prevents said source from being interconnected to said heating means.

Claim 9

In a control system as set forth in claim 1, the further improvement wherein said relay switch means has a first contact interconnected by said circuit means to one side of said heating means, said source comprising two power lines and a neutral line, said relay switch means having a second contact adapted to be interconnected to one of said power lines of said source by said circuit means, said relay switch construction when in said first position thereof holding said first and second contacts in contact with each other and when in said second position holding said first and second contacts out of contact with each other.

Claim 10

In a control system as set forth in claim 8, the further improvement wherein saId relay switch means has a third contact disposed out of contact with said second contact when said relay switch means is in said first position thereof and disposed in contact with said second contact when said relay switch means is in said second position, said relay switch means having a solenoid means for moving and maintaining the same in its second position as long as said solenoid is energized, said third contact being interconnected to one side of said solenoid means and to a said neutral line by said circuit means.

Claim 11

In a control system as set forth in claim 9, the further improvement wherein said timer operated switch means has a first switch which is in the open position when said timer operated switch means is in said first position thereof and which is in its closed position when said timer operated switch means is in its second position, one side of said first switch being interconnected by said circuit means to one power line of said source, the other side of said first switch being interconnected to said third contact of said relay switch means whereby said solenoid means is placed across said one power line and said neutral line to energize the same when said timer operated means is in its second position.

Claim 12

In a control system as set forth in claim 10, the further improvement wherein said circuit means is adapted to interconnect said second contact of said relay switch means to one of said power lines of said source through said thermostatically operated switch means whereby said solenoid means remains energized to hold said relay switch means in its said second position after said timer operated switch means returns back to said first position thereof as long as said thermostatically operated switch means remains in a closed position thereof in an on condition thereof.

Claim 13

In a control system as set forth in claim 1, the further improvement wherein said heating means comprises a broil element and a bake element.

Claim 14

A control unit for a cooking oven having heating means and a source of electrical current, said unit comprising thermostatically operated switch means adapted to interconnect and disconnect said source to and from said heating means to tend to maintain a selected temperature output effect of said heating means in said oven when a selector means of said switch means is moved from an off position thereof to a selected on position thereof, a timer operated switch means having a first position and a second position, said timer operated switch means having means for maintaining itself in its first position for a selected cooking time period and for automatically moving itself to its second position at the end of said time period and then back to its first position, relay switch means having a first position and a second position, and electrical circuit means for operatively interconnecting said source with said heating means through said switch means, said relay switch means and said timer operated switch means being adapted when in said first positions thereof to cooperate together to interconnect said source to said heating means through said thermostatically operated switch means when said thermostatically operated switch means is in an on position thereof, said timer operated switch means having means adapted to cause said relay switch means to move to its second position when said timer operated switch means automatically moves to its second position, said timer operated switch means and said relay switch means being adapted to cooperate together to thereafter maintain said relay switch means in its said second position even though said timer operated switch means automatically moves back to its first position until said thermostatically operated switch means is turned to its off position by said selector means whereby said relay switch means then is adapted to automatically move back to its said first position.

Claim 15

A control unit for a cooking oven having heating means and a source of electrical current, said unit comprising thermostatically operated switch means adapted to interconnect and disconnect said source to and from said heating means to tend to maintain a selected temperature output effect of said heating means in said oven when a selector means of said switch means is moved from an off position thereof to a selected on position thereof, a timer operated switch means having a first position and a second position, said timer operated switch means having means for maintaining itself in its first position for a selected cooking time period and for automatically moving itself to its second position at the end of said time period and then back to its first position, relay switch means having a first position and a second position, and electrical circuit means for operatively interconnecting said source with said heating means through said switch means, said relay switch means and said timer operated switch means being adapted when in said first positions thereof to cooperate together to interconnect said source to said heating means through said thermostatically operated switch means when said thermostatically operated switch means is in an on position thereof, said timer operated switch means having means adapted to cause said relay switch means to move to its second position when said timer operated switch means automatically moves to its second position, said timer operated switch means and said relay switch means being adapted to cooperate together to thereafter maintain said relay switch means in its said second position even though said timer operated switch means automatically moves back to its first position until said thermostatically operated switch means is turned to its off position by said selector means whereby said relay switch means then is adapted to automatically move back to its said first position.

Claim 16

A control unit as set forth in claim 13 wherein said timer operated switch means has means for selecting a delayed stArt time thereof that is adapted to cause said timer operated switch means to remain in a third position thereof during said delayed start time period after the lapse of which said timer operated switch means is adapted to automatically move to said first position thereof for said selected cooking time period, said timer operated switch means when in said third position being adapted to prevent said source from being interconnected to said heating means through said circuit means.

Claim 17

A control unit as set forth in claim 14 wherein said selector means can be set for a baking operation of said heating means whereby said heating means will provide a baking operation during said selected cooking time period after the lapse of said delayed start time period of said timer operated switch means.

Claim 18

A control unit as set forth in claim 15 wherein said circuit means has another thermostatically operated switch means therein which is adapted to interconnect and disconnect said source to and from said heating to tend to maintain a warmth-retaining and noncooking temperature in said oven when said selector means is set in a warmth-retaining and noncooking setting thereof and said timer operated switch means and said relay switch means are in said first positions thereof.

Claim 19

A control unit as set forth in claim 16 wherein said relay switch means and said timer operated switch means are adapted to cooperate together to interconnect said source to said heating means through said other thermostatically operated switch means following the end of said selected cooking time period when said timer operated switch means is back in its first position and said relay switch means is in its said second position until said selector means moves said first-named thermostatically operated switch means to its off position.

Claim 20

A control unit as set forth in claim 15 wherein said selector means can be set for a broiling operation of said heating means whereby said heating means will provide a broiling operation during said selected cooking time period after the lapse of said delayed start time period of said timer operated switch means.

Claim 21

A control unit as set forth in claim 13 wherein said relay switch means when in said second position thereof is adapted to prevent said source from being interconnected to said heating means.

Claim 22

A control unit as set forth in claim 13 wherein said relay switch means has a first contact adapted to be interconnected by said circuit means to one side of said heating means, said relay switch means having a second contact adapted to be interconnected to one of said power lines of a three line power source by said circuit means, said relay switch construction when in said first position thereof holding said first and second contacts in contact with each other and when in said second position holding said first and second contacts out of contact with each other.

Claim 23

A control unit as set forth in claim 20 wherein said relay switch means has a third contact disposed out of contact with said second contact when said relay switch means is in said first position thereof and disposed in contact with said second contact when said relay switch means is in said second position, said relay switch means having a solenoid means for moving and maintaining the same in its second position as long as said solenoid is energized, said third contact being interconnected to one side of said solenoid means and being adapted to be interconnected to the neutral line of said power source by said circuit means.

Claim 24

A control unit as set forth in claim 21 wherein said timer operated switch means has a first switch which is in the open position when said timer operated switch means is in said first position thereof and which is in its closed position when said timer operated switch means is in its second position, one side of said first switch being adapted to be interconnected by said circuit means to one power line of said source, the other side of said first switch being intercOnnected to said third contact of said relay switch means whereby said solenoid means is adapted to be placed across said one power line and said neutral in line to energize the same when said timer operated means is in its second position.

Claim 25

A control unit as set forth in claim 22 wherein said circuit means is adapted to interconnect said second contact of said relay switch means to one of said power lines of said source through said thermostatically operated switch means whereby said solenoid means is adapted to remain energized to hold said relay switch means in its said second position after said timer operated switch means returns back to said first position thereof as long as said thermostatically operated switch means remains in a closed position thereof in an on condition thereof.