The present invention relates to a rocker contact switch for an electrical device. More particularly, the present invention relates to a GFCI device having a rocker contact switch adapted to transfer movement of the base of the rocker contact switch into movement of a leg of the rocker contact switch. Still more particularly, the present invention relates to a GFCI device that substantially prevents being put in an end-of-life condition prior to being tripped.
GFCI devices are designed to trip in response to the detection of a ground fault condition at an alternating current (AC) load. Generally, the ground fault condition results when a person or object comes into contact with the line side of the AC load and an earth ground at the same time, a situation which can result in serious injury.
GFCI devices interrupt a circuit path, typically at an AC receptacle, in response to the detection of a ground fault condition at an AC load. Ground fault circuit interrupters are used in utility power applications to protect against leakage currents that flow through ground rather than back through the source's neutral line. They are commonly found in residential settings where the utility power is used to operate household appliances. In operation, a GFCI type device supplies electricity to an exterior circuit and opens an outlet circuit when a ground fault occurs in the exterior circuit, i.e., when a portion of a circuit that is plugged into the outlet becomes grounded. GFCI devices commonly include a differential current transformer, control circuit, and a circuit breaker device. Typically, a GFCI device detects this condition by using a sensing transformer or wire coil to detect an imbalance between the currents flowing in the hot and neutral conductors of the AC supply, as will occur when some of the current on the line side is being diverted to ground. A ground fault condition occurs when the current is diverted to the ground through another path, such as a human body, that results in an imbalance between the currents flowing in the hot (phase) and neutral conductors. When such an imbalance is detected, a circuit breaker within the ground fault circuit interrupter is immediately tripped to an open condition, thereby opening both sides of the AC line and removing all power from the AC load.
GFCI devices may be connected to fuse boxes or circuit breaker panels to provide central protection for the AC wiring throughout a commercial or residential structure. More commonly, however, GFCI devices are incorporated into electrical receptacles that are designed for installation at various locations within a building. This type of receptacle includes test and reset pushbuttons and a lamp or light-emitting diode (LED) indicating that the circuit is operating normally. When a ground fault occurs in the protected circuit, or when the test button is depressed, the GFCI device trips and an internal circuit breaker opens both sides of the AC line. The tripping of the circuit breaker causes the reset button to pop out and the LED to be extinguished, providing a visual indication that a ground fault has occurred. To reset the GFCI device, the reset button is depressed in order to close and latch the circuit breaker and to illuminate the LED once again.
To trip the GFCI device, the test button is depressed, thereby contacting a spring beam and moving it toward a resistor lead. When the spring beam contacts the resistor lead, the GFCI device is tripped. Further depressing the test button, causes further movement of the spring beam. When the spring beam contacts a diode lead, the GFCI device is put in an end-of-life condition. One of the problems with conventional GFCI devices is that when the test button is depressed too quickly, the spring beam bows, such that the spring beam contacts the diode lead before contacting the resistor lead. This premature contacting of the diode lead results in a good GFCI device being improperly put in an end-of-life condition. Thus, a good GFCI can no longer be used and must be replaced, thereby causing an inconvenience to the user.
Additionally, the spring beam contacts either the resistor or diode lead to put the GFCI device into the tripped or end-of-life condition, respectively. Thus, the same member, i.e., the spring beam, is moved to put the GFCI device into one of the two conditions, thereby increasing the likelihood of the GFCI device being put into the incorrect condition. Accordingly, a need exists for a GFCI device in which more than one member is moved to put the GFCI device in the tripped and end-of-life conditions.
Accordingly, a need exists for a GFCI device that substantially prevents being put in an end-of-life condition prior to being tripped.
Accordingly, it is a primary objective of the present invention to provide an improved contact switch that is engaged by a spring beam of a GFCI device to put the GFCI device in tripped and end-of-life conditions.
Another objective of the present invention is to provide a rocker switch for a GFCI device that translates movement of a first distance in a first direction into movement in a second and perpendicular direction of a second distance approximately two-and-a-half times that of the first distance.
A further objective of the present invention is to provide a GFCI device that is substantially prevented from entering an end-of-life condition prior to being tripped.
A still further objective of the present invention in which a first member is moved to put the GFCI device in a tripped condition and a second member is moved to put the GFCI device in an end-of-life condition.
The foregoing objectives are basically attained by a rocker contact switch for a GFCI receptacle that includes a movable base and a fixed first leg and a movable second leg extending from the base. The first leg has a first portion and a second portion. The second portion is mechanically and electrically engagable with a wire inserted in the GFCI receptacle. When the base is moved, the second leg is moved to contact a conductive member to put the GFCI receptacle in an end of life condition. The first portion of the first leg remains substantially stationary during movement of the base.
The foregoing objectives are also basically attained by a GFCI receptacle having a housing and a button accessible on an outer surface of the housing and movable be first and second distances relative to the housing. A spring beam is movable within the housing and engaged by the button when the button moves to cause tripping of the GFCI device. A rocker contact switch disposed in the housing has a movable base from which a fixed first leg and a movable second leg extend. The first leg has a first portion and a second portion. The second portion is mechanically and electrically engagable with a wire inserted in the GFCI receptacle. When the button is pushed a first distance, the button moves the spring beam to contact the base, thereby tripping the GFCI receptacle. When the button is pushed a second distance, the button moves the spring beam to engage the base such that the second leg moves to contact a conductive member to put the GFCI receptacle in an end of life condition.
The foregoing objectives are also basically attained by a method of operating a GFCI device. A button on the GFCI device is pushed a first distance to complete a first circuit by engaging a spring beam with a base of a rocker contact switch to trip the GFCI device. The button is pushed a second distance to complete a second circuit by moving the spring beam to move the base such that a second leg moves to contact a conductive member to put the GFCI receptacle in an end of life condition.
Other objects, advantages and salient features of the invention will become apparent from the following detailed description, which, taken in conjunction with the annexed drawings, discloses preferred embodiments of the invention.
As used in this application, the terms “front,” “rear,” “upper,” “lower,” “upwardly,” “downwardly,” and other relative orientational descriptors are intended to facilitate the description of the switch assembly, and are not intended to limit the structure of the switch assembly to any particular position or orientation.
The above aspects and features of the present invention will be more apparent from the description for exemplary embodiments of the present invention taken with reference to the accompanying drawings, in which:
Throughout the drawings, like reference numerals will be understood to refer to like parts, components and structures.
A rocker contact switch 21 in accordance with a first exemplary embodiment of the present invention for a GFCI device 11 (
The GFCI device 11 includes a cover 13 connected to a base 15, as shown in
As noted above, the rocker contact switch 21, as shown in
The first leg 25 has first portion 26 joined to base 23 by a right angle bend 68 and second portion 24 joined to the end of first portion 26 opposite base 23. The second portion 24 has a planar portion 62 connected to the first portion 26 by a right angle bend 64 and a first angled portion 28 adapted to mechanically and electrically engage a wire that is terminated by inserting the wire in the GFCI device 11a. Preferably, the planar portion 62 is substantially L-shaped, as shown in
The second leg 27 of the rocker contact switch 21 is joined to base 23 by a right angle bend 69 laterally adjacent first leg 25 and is preferably substantially parallel to the first portion 26 of the first leg 25, as shown in
The spring beam 41 is movably disposed in the base 15 of the GFCI device 11, as shown in
A conductive member 51 is mounted in the base 15 of the GFCI device 11, as shown in
A barrier 61 is mounted in the base 15 of the GFCI device 11, as shown in
A rocker contact switch 221 in accordance with a second exemplary embodiment of the present invention is shown in
The rocker contact switch 221, as shown in
The first leg 225 has a first portion 226 and a second portion 224. The second portion 224 has a first angled portion 228 adapted to mechanically and electrically engage a wire that is terminated by inserting the wire in the GFCI device 11. The first angled portion 228 of the first leg 225 has an angle θ to facilitate receiving an inserted wire. The angle θ is determined by the diameter of the wire 10 being inserted in the GFCI device. Preferably, the angle θ is approximately 70 degrees with respect to the wire prior to insertion thereof.
The second leg 227 of the rocker contact switch 221 is preferably substantially parallel to the first portion 226 of the first leg 225, as shown in
Assembly and Operation
A fully assembled GFCI device 11 is shown in
Operation of the rocker contact switch 21 is shown in
To put the GFCI device in a tripped condition, as shown in
To put the GFCI device in an end-of-life condition, as shown in
The tab 20 of the rocker contact switch 21 facilitates engagement between the spring beam 41 and the base 23 of the rocker contact switch. The free end 45 of the spring beam pushes on the base 23 of the rocker contact switch 21, which causes the second leg 27 of the rocker contact switch to rotate. The first leg 25 of the rocker contact switch 21 is substantially prevented from rotating by the presence of the blocking surface 63 of the arm 60 of the barrier 61 (
As shown in
When the GFCI device is successfully tripped, as discussed above, there is no electrical current available to blow the fuse 99. Thus, if the test button 17 is pushed from the tripped condition (
Accordingly, the rocker contact switch according to exemplary embodiments of the present invention provides a GFCI device in which more than one member is moved to put the GFCI device in the tripped and end-of-life conditions. The spring beam 21 is first moved to contact the rocker contact switch 21 to put the GFCI device 11 in the tripped condition. The second leg 27 of the rocker contact switch 21 is then moved to contact the conductive member 51 to put the GFCI device 11 in an end-of-life condition. Thus, the GFCI device of the exemplary embodiments of the present invention overcomes the disadvantages associated with existing GFCI devices in which only the spring beam is moved to put the GFCI device in either the tripped or end-of-life condition. Specifically, the rocker contact switch according to exemplary embodiments of the present invention prevents the GFCI from being put in an end-of-life condition prior to being tripped.
While a number of advantageous embodiments have been chosen to illustrate the invention, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the scope of the invention as defined in the appended claims.
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