Reset lockout and trip for circuit interrupting device

• US 20030206085A1
• Filed: 05/01/2002
• Published: 11/06/2003
• Est. Priority Date: 05/01/2002
• Status: Active Grant

• Current Assignee: Leviton Manufacturing Company Incorporated
• Original Assignee: Leviton Manufacturing Company Incorporated
• Inventors: Germain, Frantz, Stewart, Stephen
• Granted Patent: US 6,788,173 B2
• Time in Patent Office: Days
• US Class Current: 335/166
• CPC Class Codes: H01H 2083/201 the other abnormal electrical condition being an arc fault
• CPC Class Codes: H01H 3/50 with indexing or locating means, e.g. indexing by ball and spring
• CPC Class Codes: H01H 71/62 with means for preventing resetting while abnormal condition persists, e.g. loose handle arrangement
• CPC Class Codes: H01H 83/02 operated by earth fault currents H01H83/14 takes precedence
• CPC Class Codes: H01H 83/04 with testing means for indicating the ability of the switch or relay to function properly

Abstract

This invention relates to a circuit interrupting device having a trip button for disconnecting a load from a source of electrical power and a reset button for resetting the device after it has tripped. When the device is operating in its reset state, a source of electrical power is connected to a load through a set of contacts located within the device. The contacts are held closed by the spring loaded reset button which holds captive and urges a latch plate to move up to close normally open contacts. In the preferred mechanical trip mechanism, depressing the trip button causes the latch plate to move forward and be released from the reset button. The latch plate, upon being released from the reset button moves down to allow the contacts, which are biased to be normally open, to assume their normally open position. At this time, pressing the reset button initiates an electrical cycle which causes the normally open contacts to close only if the device is operating properly and there is no fault on the line. The device described is mechanically tripped and electrically reset, and it can be tripped without power being supplied to the device.

Claims

1. A mechanically tripped, electrically reset circuit interrupting device comprising:

a housing;

at least one input conductor disposed at least partially within said housing and capable of being electrically connected to a source of electricity;

at least one output conductor disposed within said housing and capable of conducting electrical current to a load when electrically connected to said at least one input conductor;

a circuit interrupter disposed within said housing and configured to break said electrical connection between said input and output conductors in response to the occurrence or a predetermined condition;

a reset lock-out responsive to the occurrence of said predefined condition such that said reset lock-out is operable between a lock-out position wherein said reset lock-out inhibits resetting of said electrical connection between said input and output conductors and a reset position wherein said reset lock-out does not inhibit resetting of said electrical connection between said input and output conductors; and

a trip mechanism operatively associated with said reset lock-out and said circuit interrupter such that mechanical activation of said trip mechanism conditions said circuit interrupter to be electrically driven to said reset position by said reset mechanism.

2. The mechanically tripped, electrically reset circuit interrupting device according to claim 1, wherein said circuit interrupter comprises a coil assembly, a movable plunger responsive to energizing of said coil assembly and a latch plate attached to said plunger such that movement of said plunger is translated to movement of said latch plate and movement of said latch plate causes said reset lock-out to operate in said lock-out position or said reset position.

3. The mechanically tripped, electrically reset circuit interrupting device according to claim 2, wherein said input conductor has an electrical contact attached thereto and said output conductor has an electrical contact attached thereto, and at least one of said conductors is movable relative to the other such that said electrical connection is made when said input and output contacts are closed.

4. The mechanically tripped, electrically reset circuit interrupting device according to claim 3, wherein when said reset lock-out is in said lock-out position said contacts are inhibited from closing.

5. The mechanically tripped, electrically reset circuit interrupting device according to claim 1, wherein said reset mechanism comprises:

a trip button coupled to said reset lock-out only when said device is in its lock-out mode; and

a reset contact that is activated when said reset button is depressed.

6. The mechanically tripped, electrically reset circuit interrupting device according to claim 1, wherein said predetermined condition comprises a ground fault, an arc fault, an appliance leakage fault, or an immersion fault.

7. A mechanically tripped, electrically reset ground fault interrupting device comprising:

a housing;

at least one input conductor disposed at least partially within said housing and capable of being electrically connected to a source of electricity;

at least one output conductor disposed within said housing and capable of conducting electrical current to a load when electrically connected to said at least one input conductor;

a circuit interrupter disposed within said housing and configured to break said electrical connection between said input and output conductors in response to the occurrence or a depression of a trip button with or without electrical current being received; and

a reset mechanism having a reset lock-out responsive to activation of said circuit interrupter so as to be movable between a lock-out position wherein said reset lock-out inhibits resetting of said electrical connection between said input and output conductors and a reset position wherein said reset lock-out does not inhibit resetting of said electrical connection between said input and output conductors, wherein when said reset mechanism is activated said circuit interrupter is activated to facilitates movement of said reset lock-out from said lock-out position to said reset position by said reset mechanism and resets said electrical connection between said input and output conductors.

8. The mechanically tripped, electrically reset ground fault interrupting device according to claim 7, wherein said circuit interrupter comprises a coil assembly, a movable plunger responsive to energizing of said coil assembly and a latch plate attached to said plunger such that movement of said plunger is translated to movement of said latch plate and movement of said latch plate causes said reset lock-out to operate in said lock-out position or said reset position.

9. The mechanically tripped, electrically reset ground fault interrupting device according to claim 8, wherein said input conductor has an electrical contact attached thereto and said output conductor has an electrical contact attached thereto, and at least one of said conductors is movable relative to the other such that said electrical connection is made when said input and output contacts are closed.

10. The mechanically tripped, electrically reset ground fault interrupting device according to claim 9, wherein when said reset lock-out is in said lock-out position said contacts are inhibited from closing.

11. The mechanically tripped, electrically reset ground fault interrupting device according to claim 7, wherein said reset mechanism comprises:

a reset button coupled to said reset lock-out; and

at least one reset contact that is activated when said reset button is depressed.

12. The mechanically tripped, electrically reset circuit interrupting device comprising;

housing means;

input conductor means disposed at least partially within said housing means and capable of being electrically connected to a source of electricity;

output conductor means disposed at least partially within said housing means and capable of conducting electrical current to a load when electrically connected to said input conductor;

circuit interrupting means disposed within said housing means for breaking said electrical connection between said input and output conductor means in response to the occurrence of a predetermined condition;

reset lock-out means responsive to manual depression of a reset means for resetting of said electrical connection between said input and output conductor means after said circuit interrupting means breaks said connection between said input and output conductor means; and

reset means disposed within said housing means for activating said circuit interrupting means so that said lock-out means does not inhibit resetting of said electrical connection between said input and output conductor means and for resetting said electrical connection between said input and output conductor means.

13. The mechanically tripped, electrically reset circuit interrupting device according to claim 12, wherein said circuit interrupting means comprises a coil means, movable plunger means responsive to energizing of said coil means and latch means attached to said plunger means such that movement of said plunger means is translated to movement of said latch means and movement of said latch means causes said reset lock-out means to close said input and output contact means.

14. The mechanically tripped, electrically reset circuit interrupting device according to claim 13, wherein said input conductor means includes electrical contact means and said output conductor means includes electrical contact means, and wherein at least one of said conductor means is movable relative to the other such that said electrical connection is made when said input and output contacts means are closed.

15. The mechanically tripped, electrically reset circuit interrupting device according to claim 13, wherein said reset means comprises:

a reset button coupled to said reset lock-out means; and

reset contact means that is activated when said reset button is depressed.

16. The mechanically tripped, electrically reset circuit interrupting device according to claim 12, wherein said predetermined condition comprises a ground fault, an arc fault, an appliance leakage fault, or an immersion fault.

17. A method for interrupting and resetting electrical connections in fault interrupting devices having a housing, an input conductor disposed at least partially within the housing and electrically connected to a source of electricity, and an output conductor disposed at least partially within the housing and capable of conducting electrical current to a load when electrical continuity between the input and output conductors is made, said method comprising:

sensing the occurrence of a predefined condition;

breaking electrical continuity between the input and output conductors when said predefined condition is sensed using a circuit interrupting mechanism;

enabling a lock-out mechanism to inhibit the making of electrical continuity between the input and output conductors after breaking electrical continuity between said conductors; and

manually activating a reset mechanism that electrically activates said circuit interrupting mechanism to made electrical continuity between said input and output conductors.

18. The method according to claim 17, wherein said predefined condition comprises a ground fault, an arc fault, an appliance leakage fault or an immersion fault.