Circuit interrupting device with end of life testing functions

• US 7,411,766 B1
• Filed: 07/06/2007
• Issued: 08/12/2008
• Est. Priority Date: 02/14/2007
• Status: Expired due to Fees

• Current Assignee: Huadao Huang
• Original Assignee: Huadao Huang
• Inventors: Huayang, Lu, Huang, Huadao
• Primary Examiner(s): Barrera; Ramon M
• Application Number:
  US11/822,562
• Publication Number:
  US 20080192393A1
• Time in Patent Office: 403 Days
• Field of Search: 361 42- 50, 335/6, 335/13, 335/17
• US Class Current: 361/42
• CPC Class Codes: H01H 2071/044 Monitoring, detection or measuring systems to establish the end of life of the switching device, can also contain other on-line monitoring systems, e.g. for detecting mechanical failures
• CPC Class Codes: H01H 71/04 Means for indicating condition of the switching device by means of an auxiliary contact H01H71/46
• CPC Class Codes: H01H 73/44 reset by push-button, pull-knob or slide
• CPC Class Codes: H01H 83/144 with differential transformer

Abstract

The present invention provides a circuit interrupting device which comprises a novel reset mechanism to allow a user to test whether the device is wired properly. The novel reset mechanism includes a reset conducting apparatus which contains a reset start switch (KR-4). The KR-4 contains a first conducting pin, a second conducting pin, and a conducting bridge. When the reset button is depressed and the device is wired properly, the KR-4 is closed to allow the conducting bridge to be in contact with both the first and the second conducting pins so as to reset the device. The present invention also provides a circuit interrupting device which is capable of automatically checking the components of the circuit interrupting device (i.e., the end of life test) through a novel status test switch (KR-1). The KR-1 comprises a flexible metal piece and a simulated leakage current controlling resistor, which is located underneath of the flexible metal piece. When the circuit interrupting device is properly wired and at a tripped state, without touching any parts of the circuiting interrupting device, the KR-1 is closed which generates a simulated leakage current to allow the device to conduct the end of life test. If all of the components in the device are functioned properly, a reset indicating light is lit.

Claims

1. A circuit interrupting device which is capable of establishing or disconnecting electrical continuity between a power source, an output load and a user accessible load;

said circuit interrupting device comprising;

a reset button; and

a reset conducting apparatus which comprises a reset start switch (KR-4) operationally connecting to said reset button so that when said circuit interrupting device is wired properly, a depression of said reset button allows said KR-4 switch to close;

said KR-4 comprising;

a first conducting pin having a first end and a second end, wherein said first end of said first conducting pin is adapted to electrically connect to ground via a silicon controlled rectifier (SCR);

a second conducting pin having a first end and a second end, wherein said first end of said second conducting pin is adapted to electrically connect to a hot wire at an input end of a power source via a solenoid coil; and

a conducting bridge which connects to said second end of said first conducting pin and said second end of said second conducting pin when said reset button is depressed so as to establish said electrical continuity of said circuit interrupting device when said circuit interrupting device is wired properly.

2. The circuit interrupting device according to claim 1, wherein said circuit interrupting device is a ground fault circuit interrupter, an arc fault circuit interrupter, an immersion detection circuit interrupter, an appliance leakage circuit interrupter, or a circuit breaker.

3. The circuit interrupting device according to claim 1, wherein said circuit interrupting device further comprises a tripping device comprising:

a tripper which contains an aperture to receive a directional lock extended from said reset button;

a locking device having a locking spring and containing a first through hole and a second through hole;

wherein said first through hole is capable of aligning with said aperture of said tripper to receive said directional lock extended from said reset button; and

wherein said locking device threads through said tripper; and

said solenoid coil (SOL) having a plunger;

wherein when said SOL is energized, said plunger plunges onto a side wall of said locking device causing said first through hole to align with said aperture of said tripper to reset or trip said circuit interrupting device so as to connect or disconnect said electrical continuity of said circuit interrupting device.

4. The circuit interrupting device according to claim 3, wherein said reset conducting apparatus is located at the bottom of said tripper.

5. The circuit interrupting device according to claim 1, wherein each of said second end of said first conducting pin and said second conducting pin comprises an upper conducting piece and a lower conducting piece separated by a recessed slot;

wherein said conducting bridge is rested at said recessed slot between said upper conducting piece and said lower conducting piece and not connected to said first and said second conducting pins when said circuit interrupting device is at a tripped state; and

wherein said conducting bridge is pressed against each of said lower conducting piece of said first and second conducting pins when said reset button is depressed.

6. The circuit interrupting device according to claim 5, wherein said reset conducting apparatus further comprises a reset switch box having a spring receiving slot;

wherein a directional spring is located between said conducting bridge and said spring receiving slot of said reset switch box;

whereby when said reset button is depressed, said directional spring is compressed to allow said conducting bridge to press against each of said lower conducting piece of said first and second conducting pins; and

whereby when said reset button and said tripper are in the release state, said conducting bridge is rested at said recessed slot between said upper conducting piece and said lower conducting piece; and

whereby when said reset button is reset, said directional spring is relaxed which allows said conducting bridge to be contacted with each of said upper conducting piece of said first and said second conducting pins.

7. The circuit interrupting device according to claim 3, wherein said second through hole of said locking device receives an upward inclined handle of a rotatable tripping lever;

and

wherein said rotatable tripping lever further comprises a pair of rotating shafts protruding on both sides of said rotatable tripping lever, a level axis, and a v-shaped slot capable of receiving an end of an arm extended from a test button.

8. The circuit interrupting device according to claim 7, wherein said pair of rotating shafts on said rotatable tripping lever are secured in a pair of vertical directional slots within a solenoid coil support.

9. The circuit interrupting device according to claim 7, wherein a pair of metal pieces are situated along a side of said rotatable tripping lever in said solenoid coil support;

wherein said pair of metal pieces does not contact with each other when said rotatable tripping lever is not rotated;

wherein when said rotatable tripping lever is rotated upward, said side of said rotatable tripping lever pushes said pair of metal pieces to be in contact with each other.

10. The circuit interrupting device according to claim 9, wherein one of said pair of said metal pieces is adapted to electrically connect to a neutral wire at said input end of said power source via a resistor;

and wherein the other one of said pair of said metal pieces is adapted to electrically connect to a hot wire of an output end.

11. The circuit interrupting device according to claim 7, wherein said test button has a first level and a second level of depression.

12. The circuit interrupting device according to claim 11, wherein when said test button is depressed at said first level, said end of said extended arm of said test button pushes said v-shaped slot of said rotatable tripping lever to cause said rotatable tripping lever to rotate around said lever axis and thereby pushes said pair of metal pieces to be in contact with each other, thereby simulated a fault to test components of said circuit interrupting device.

13. The circuit interrupting device according to claim 11, wherein a depression of said test button at said second level causes said circuit interrupting device to be mechanically tripped.

14. The circuit interrupting device according to claim 12, wherein said components of said circuit interrupting device tested by said depression of said test button at said first level comprise a differential transformer (DT), an integrated circuit (IC), said silicon controlled rectifier (SCR), and said solenoid coil (SOL).

15. The circuit interrupting device according to claim 1, further comprising a first pair of flexible metal pieces and a second pair of flexible metal pieces;

wherein one end of each of said first pair of flexible metal pieces passes through a differential transformer and is operationally connected to a hot power input end or a neutral power input end;

the other end of each of said first pair of flexible metal pieces having a movable contact point;

wherein one end of each of said second pair of flexible metal pieces is operationally connected to a hot power output end or a neutral power output end;

the other end of each of said second pair of flexible metal pieces having a movable contact point.

16. The circuit interrupting device according to claim 15, further comprising a pair of output conductors connected to said user accessible load and positioned in said housing;

wherein each of said output conductors contains a pair of fixed contact points;

wherein said movable contact point of each of said first pair of flexible metal pieces and said movable contact point of each of said second pair of flexible metal pieces are capable of connecting/disconnecting to each of said fixed contact points of said pair of output conductors respectively.

17. The circuit interrupting device according to claim 15, wherein each of said first pair of said flexible metal pieces and each of said second pair of said flexible metal pieces are soldered on a circuit board and are not directly connected to said input end and said output end.

18. The circuit interrupting device according to claim 16, wherein each of said movable contact points of said first pair of said flexible metal pieces is in a different cross sectional plane from said each of said movable contact points of said second pair of said flexible metal pieces;

and

wherein said first pair of said flexible metal pieces and said second pair of said flexible metal pieces are above a pair of cantilever arm at both sides of a tripper.

19. The circuit interrupting device according to claim 16, wherein each of said pair of said output conductor comprises a pair of gripping wing pieces protruded to output socket holes at a front lid of said housing.

20. The circuit interrupting device according to claim 16, wherein when each of said movable contact point of each of said first pair of flexible metal pieces is connected to each of said fixed contact points of said pair of output conductors, electrical current is conducted from said power source to said user accessible load;

and

wherein when each of said movable contact point of each of said second pair of flexible metal pieces is connected to each of said fixed contact points of said pair of output conductors, electrical current is conducted from said user accessible load to said output load.

21. The circuit interrupting device according to claim 15, wherein a simulated leakage current controlling resistor is located underneath one of said first pair of flexible metal pieces which is adapted to electrically connected to a neutral wire of said input end;

wherein said simulated leakage current controlling resistor has a first end and a second end;

said first end of said simulated leakage current controlling resistor being capable of contacting with said one of said first pair of flexible metal pieces;

said second end of said simulated leakage current controlling resistor being adapted to electrically connect to said hot wire of said input end via said solenoid coil (SOL); and

wherein said simulated leakage current controlling resistor and said one of said first pair of flexible metal pieces form a status test switch (KR-1).

22. The circuit interrupting device according to claim 21, wherein when said circuit interrupting device is powered on and at a tripped state, said KR-1 is closed due to said simulated leakage current controlling resistor contacting with said one of said first pair of flexible metal pieces;

and

wherein said KR-1 is closed without a depression of said reset button.

23. The circuit interrupting device according to claim 21, wherein when said circuit interrupting device is reset, said KR-1 is opened due to said simulated leakage current controlling resistor separating from said one of said first pair of flexible metal pieces.

24. The circuit interrupting device according to claim 22, wherein when said KR-1 is closed, said circuit interrupting device is automatically performing a test of components of said circuit interrupting device.

25. The circuit interrupting device according to claim 24, wherein said components of said circuit interrupting device comprises a differential transformer, an integrated circuit, said silicon controlled rectifier (SCR), and said solenoid coil.

26. The circuit interrupting device according to claim 21, wherein a pair of hooked pins are positioned above said first pair of flexible metal pieces;

wherein said pair of hooked pins having an upper end and a lower end;

each of said upper end of said hooked pins being clamped to a mid-level support within said housing;

each of said lower end of said hooked pins having a cylindrical platform being pressed on each of said pair of flexible metal pieces when said circuit interrupting device is powered on and at said tripped state to cause said simulated leakage current controlling resistor to be in close contact with said one of said first pair of flexible metal pieces so as to generate a simulated leakage current.

27. The circuit interrupting device according to claim 26, wherein each of said pair of hooked pins comprises a spring at outside of each of said pair of hooked pins.

28. The circuit interrupting device according to claim 24, wherein a reset indicating light is lit when said components are functioned properly.

29. The circuit interrupting device according to claim 28, further comprising a power output indicator light;

wherein said power output indicator light is lit when said circuit interrupting device has power output.

30. The circuit interrupting device according to claim 28, wherein one end of said reset indicating light is connected to a negative pole of said power source through said silicon controlled rectifier (SCR) and the other end is connected to said hot wire of said input end of said power source through a resistor and said solenoid coil.

31. The circuit interrupting device according to claim 1, wherein said solenoid coil has a coil protection cover placed at outside of said solenoid coil.

32. A circuit interrupting device comprising:

a reset button; and

a status test switch (KR-1) comprising a flexible metal piece having a first end and a second end;

wherein said first end of said flexible metal piece is soldered to a circuit board;

wherein said second end of said flexible metal piece is capable of contacting a simulated leakage current controlling resistor located underneath said flexible metal piece; and

wherein said flexible metal piece is adapted to electrically connected to a neutral wire of an input end of a power source;

wherein said simulated leakage current controlling resistor has a first end and a second end;

wherein said first end of said simulated leakage current controlling resistor is capable of contacting said flexible metal piece;

wherein said second end of said simulated leakage current controlling resistor is adapted to connect to said circuit board and electrically connect to a hot wire of said input end via a solenoid coil;

wherein when said flexible metal piece is adapted to electrically connect to said neutral wire of said input end, said simulated leakage current controlling resistor is adapted to electrically connect to said hot wire of said input end and vise versa;

wherein when said circuit interrupting device is powered on and at a tripped state, without depressing said reset button, said flexible metal piece is in contact with said simulated leakage current controlling resistor so as to close said KR-1; and

wherein when said circuit interrupting device is reset, said flexible metal piece is separated from said simulated leakage current controlling resistor to open said KR-1.

33. The circuit interrupting device according to claim 32, wherein when said KR-1 is closed, said flexible metal piece, said simulated leakage current controlling resistor and said solenoid coil form a loop to automatically generate a simulated leakage current to test components of said circuit interrupting device without a depression of said reset button.

34. The circuit interrupting device according to claim 33, wherein said components of said circuit interrupting device comprise a differential transformer, an integrated circuit, said silicon controlled rectifier (SCR), and said solenoid coil.

35. The circuit interrupting device according to claim 32, wherein when said components of said circuit interrupting device are functioned properly, a reset indicating light is lit.