Door latching system

Claim 2

A latching system for a door, such system comprising, in combination: A. an electrically energizable coil and associated plunger, such plunger actuable in a selected direction from a first position to a second position by the energization of said coil; B. means for resiliently biasing said plunger to said first position; C. a cam member rotatable between first and second positions about a pivot; D. means coupling said plunger with said cam member for rotation of such member through a first path extending from its said first position to a position about halfway towards its said second position when said plunger is actuated in said selected direction for the first time in a pair of successive actuations of such plunger, and through a second path extending from its said second position to a position about halfway towards its said first position when said plunger is actuated in said selected direction for the second time in said pair of successive actuations of the plunger; E. means coupled with said cam member for unlatching and latching said door when such cam member is rotated to said first and second positions thereof, respectively; F. a first electric circuit controlling device manually actuable between at least two positions, such device having a first set of contacts closed only when the device is in a first of said two positions and a second set of contacts closed only when the device is in a second of said two positions; G. a second electric circuit controlling device, such device actuable by said cam member and having first and second sets of contacts in closed and opened conditions, respectively, when the cam member is at said first position thereof and during the rotation of the cam member between said positions of its said first path of rotation, and in opened and closed conditions, respectively, when the cam member is at said second position thereof and during the rotation of the cam member between said positions of its said second path of rotation; H. a third electric circuit controlling device, such device actuable by said door and having a set of contacts closed only when such door is closed; I. a first series electrical circuit for energizing said coil, such circuit including said first set of contacts of said first electric circuit controlling device, said second set of contacts of said second electric circuit controlling device, and said set of contacts of said third electric circuit controlling device; and J. a second series electrical circuit for energizing said coil, such circuit including said second set of contacts of said first electric circuit controlling device, said first set of contacts of said second electric circuit controlling device, and said set of contacts of said third electric circuit controlling device.

Claim 3

A door latching system in accordance with claim 1 and in which said door is the door of a baking oven.

Claim 4

A door latching system in accordanCe with claim 2 and further including a set of thermostatically actuable electric circuit controlling contacts connected in series in said second electrical circuit, such contacts being closed only when the temperature in said oven is below a preselected temperature therefor.

Claim 5

A door latching system in accordance with claim 1 and in which said coil and associated plunger are a solenoid coil and its associated movable core, respectively.

Claim 6

A door latching system in accordance with claim 2 and in which said first electric circuit controlling device is a manually actuable bake or clean cycle selector for said oven.

Claim 7

A door latching system in accordance with claim 3 and in which said first electric circuit controlling device is a manually actuable bake or clean cycle selector for said oven.

Claim 8

A door latching system in accordance with claim 1 and in which said second electric circuit controlling device comprises a switch having an actuating member which is resiliently biased to a first position for the actuation of said first and second sets of contacts of such device to their said closed and opened conditions, respectively, and which is actuable by said cam member for the actuation of said first and second sets of contacts to their said opened and closed conditions, respectively.

Claim 9

A door latching system in accordance with claim 2 and in which said second electric circuit controlling device comprises a switch having an actuating member which is resiliently biased to a first position for the actuation of said first and second sets of contacts of such device to their said closed and opened conditions, respectively, and which is actuable by said cam member for the actuation of said first and second sets of contacts to their said opened and closed conditions, respectively.

Claim 10

A door latching system in accordance with claim 3 and in which said second electric circuit controlling device comprises a switch having an actuating member which is resiliently biased to a first position for the actuation of said first and second sets of contacts of such device to their said closed and opened conditions, respectively, and which is actuable by said cam member for the actuation of said first and second sets of contacts to their said opened and closed conditions, respectively.

Claim 11

A door latching system in accordance with claim 4 and in which said second electric circuit controlling device comprises a switch having an actuating member which is resiliently biased to a first position for the actuation of said first and second sets of contacts of such device to their said closed and opened conditions, respectively, and which is actuable by said cam member for the actuation of said first and second sets of contacts to their said opened and closed conditions, respectively.

Claim 12

A door latching system in accordance with claim 5 and in which said second electric circuit controlling device comprises a switch having an actuating member which is resiliently biased to a first position for the actuation of said first and second sets of contacts of such device to their said closed and opened conditions, respectively, and which is actuable by said cam member for the actuation of said first and second sets of contacts to their said opened and closed conditions, respectively.

Claim 13

A door latching system in accordance with claim 6 and in which said second electric circuit controlling device comprises a switch having an actuating member which is resiliently biased to a first position for the actuation of said first and second sets of contacts of such device to their said closed and opened conditions, respectively, and which is actuable by said cam member to actuate said first and second sets of contacts to their said opened and closed conditions, respectively.

Claim 14

A latching system for a door, such system comprising, in combination; A. an electrically energizable coil and associated plunger, such plunger actuable in a selected direction from a first position to a second position By the energization of said coil; B. means for resiliently biasing said plunger to said first position; C. a cam member rotatable between first and second positions about a pivot and including a cam portion; D. means including a longitudinal linking member coupling one end of said plunger with said cam member for rotation of such member through a first path extending from its said first position to a position about halfway towards its said second position when said plunger is actuated in said selected direction for the first time in a pair of successive actuations of such plunger, and through a second path extending from its said second position to a position about halfway towards its said first position when said plunger is actuated in said selected direction for the second time in said pair of successive actuations of the plunger, said linking member pivotally connected adjacent one end thereof to said cam member and having a hole in the second end thereof through which a pin in said one end of said plunger extends, said hole having a shape such as to provide for a limited amount of longitudinal movement of said linking member relative to said pin while providing a pivotal coupling between such member and pin; E. means pivotally coupled with said cam member for unlatching and latching said door when such cam member is rotated to said first and second positions thereof, respectively; F. a first electric circuit controlling device manually actuable between at least two positions, such device having a first set of contacts closed only when the device is in a first of said two positions and a second set of contacts closed only when the device is in a second of said two positions; G. a second electric circuit controlling device, such device actuable by said cam member and having first and second sets of contacts in closed and opened conditions, respectively, when the cam member is at said first position thereof and during the rotation of the cam member between said positions of its said first path of rotation, and in opened and closed conditions, respectively, when the cam member is at said second position thereof and during the rotation of the cam member between said positions of its said second path of rotation; H. a third electric circuit controlling device, such device actuable by said door and having a set of contacts closed only when such door is closed; I. a first series electrical circuit for energizing said coil, such circuit including said first set of contacts of said first electric circuit controlling device, said second set of contacts of said second electric circuit controlling device, and said set of contacts of said third electric circuit controlling device; and J. a second series electrical circuit for energizing said coil, such circuit including said second set of contacts of said first electric circuit controlling device, said first set of contacts of said second electric circuit controlling device, and said set of contacts of said third electric circuit controlling device.

Claim 15

A latching system for a door, such system comprising, in combination; A. an electrically energizable coil and associated plunger, such plunger actuable in a selected direction from a first position to a second position By the energization of said coil; B. means for resiliently biasing said plunger to said first position; C. a cam member rotatable between first and second positions about a pivot and including a cam portion; D. means including a longitudinal linking member coupling one end of said plunger with said cam member for rotation of such member through a first path extending from its said first position to a position about halfway towards its said second position when said plunger is actuated in said selected direction for the first time in a pair of successive actuations of such plunger, and through a second path extending from its said second position to a position about halfway towards its said first position when said plunger is actuated in said selected direction for the second time in said pair of successive actuations of the plunger, said linking member pivotally connected adjacent one end thereof to said cam member and having a hole in the second end thereof through which a pin in said one end of said plunger extends, said hole having a shape such as to provide for a limited amount of longitudinal movement of said linking member relative to said pin while providing a pivotal coupling between such member and pin; E. means pivotally coupled with said cam member for unlatching and latching said door when such cam member is rotated to said first and second positions thereof, respectively; F. a first electric circuit controlling device manually actuable between at least two positions, such device having a first set of contacts closed only when the device is in a first of said two positions and a second set of contacts closed only when the device is in a second of said two positions; G. a second electric circuit controlling device, such device actuable by said cam member and having first and second sets of contacts in closed and opened conditions, respectively, when the cam member is at said first position thereof and during the rotation of the cam member between said positions of its said first path of rotation, and in opened and closed conditions, respectively, when the cam member is at said second position thereof and during the rotation of the cam member between said positions of its said second path of rotation; H. a third electric circuit controlling device, such device actuable by said door and having a set of contacts closed only when such door is closed; I. a first series electrical circuit for energizing said coil, such circuit including said first set of contacts of said first electric circuit controlling device, said second set of contacts of said second electric circuit controlling device, and said set of contacts of said third electric circuit controlling device; and J. a second series electrical circuit for energizing said coil, such circuit including said second set of contacts of said first electric circuit controlling device, said first set of contacts of said second electric circuit controlling device, and said set of contacts of said third electric circuit controlling device.

Claim 16

A door latching system in accordance with claim 13 and in which said door is the door of a baking oven.

Claim 17

A door latching system in accordance with claim 14 and further including a set of thermostatically actuable electric circuit controlling contacts connected in series in said second electrical circuit, such contacts being closed only when the temperature in said oven is below a preselected temperature therefor.

Claim 18

A door latching system in accordance with claim 15 and in which said coil and associated plunger are a solenoid coil and its associated movable core, respectively.

Claim 19

A door latching system in accordance with claim 15 and in which said first electric circuit controlling device is a manually actuable bake or clean cycle selector for said oven.

Claim 20

A door latching system in accordance with claim 16 and in which said first electric circuit controlling device is a manually actuable bake or clean cycle Selector for said oven.

Claim 21

A door latching system in accordance with claim 13 and in which said second electric circuit controlling device comprises a switch having an actuating member which is resiliently biased to a first position for the actuation of said first and second sets of contacts of such device to their said opened and closed conditions, respectively, and which is actuable by said cam portion of said cam member to actuate said first and second sets of contacts to their said closed and opened conditions, respectively.

Claim 22

A door latching system in accordance with claim 14 and in which said second electric circuit controlling device comprises a switch having an actuating member which is resiliently biased to a first position for the actuation of said first and second sets of contacts of such device to their said opened and closed conditions, respectively, and which is actuable by said cam portion of said cam member to actuate said first and second sets of contacts to their said closed and opened conditions, respectively.

Claim 23

A door latching system in accordance with claim 15 and in which said second electric circuit controlling device comprises a switch having an actuating member which is resiliently biased to a first position for the actuation of said first and second sets of contacts of such device to their said opened and closed conditions, respectively, and which is actuable by said cam portion of said cam member to actuate said first and second sets of contacts to their said closed and opened conditions, respectively.

Claim 24

A door latching system in accordance with claim 16 and in which said second electric circuit controlling device comprises a switch having an actuating member which is resiliently biased to a first position for the actuation of said first and second sets of contacts of such device to their said opened and closed conditions, respectively, and which is actuable by said cam portion of said cam member to actuate said first and second sets of contacts to their said closed and opened conditions, respectively.

Claim 25

A door latching system in accordance with claim 17 and in which said second electric circuit controlling device comprises a switch having an actuating member which is resiliently biased to a first position for the actuation of said first and second sets of contacts of such device to their said closed and opened conditions, respectively, and which is actuable by said cam portion of said cam member to actuate said first and second sets of contacts to their said closed and opened conditions, respectively.

Claim 26

A door latching system in accordance with claim 18 and in which said second electric circuit controlling device comprises a switch having an actuating member which is resiliently biased to a first position for the actuation of said first and second sets of contacts of such device to their said opened and closed conditions, respectively, and which is actuable by said cam portion of said cam member to actuate said first and second sets of contacts to their said closed and opened conditions, respectively.

Claim 27

A latching system for a door forming a closure on an oven cavity which comprises: A. a solenoid-actuable core member longitudinally movable between first and second predetermined positions, B. means biasing said core member to said first position, C. cam means moveable between first and second positions, D. means coupling said core member and cam member together for moving said cam member between said positions upon the energizations of the solenoid of said core member, E. latching means coupled to said means for unlatching and latching said door in accordance with the position of said cam member, F. switch means operable in response to the position of said cam member, G. manually-operable selector switch means connected in alternate series circuits with said cam-operated switch means, and H. said solenoid-actuable core member, said biasing means, said couplinG means and said latching means being operable to latch said door when such door is in a closed position and said cam member is in one of its said positions with said manually operable selector switch in a selected first position, and said solenoid-actuable core member, said biasing means, said coupling means and said latching means being operable to unlatch said door when said cam member is in the other of its said positions and said manually operable selector switch is in a selected second position.

Claim 28

A latching system for a door forming a closure on an oven cavity which comprises: A. a solenoid-actuable core member longitudinally movable between first and second predetermined positions, B. means biasing said core member to said first position, C. cam means moveable between first and second positions, D. means coupling said core member and cam member together for moving said cam member between said positions upon the energizations of the solenoid of said core member, E. latching means coupled to said means for unlatching and latching said door in accordance with the position of said cam member, F. switch means operable in response to the position of said cam member, G. manually-operable selector switch means connected in alternate series circuits with said cam-operated switch means, and H. said solenoid-actuable core member, said biasing means, said couplinG means and said latching means being operable to latch said door when such door is in a closed position and said cam member is in one of its said positions with said manually operable selector switch in a selected first position, and said solenoid-actuable core member, said biasing means, said coupling means and said latching means being operable to unlatch said door when said cam member is in the other of its said positions and said manually operable selector switch is in a selected second position.