Electricity: circuit makers and breakers – Combined with or actuated by connector coupling – Meeting contacts of coupling members forming switch contacts
Reexamination Certificate
2000-10-31
2001-10-16
Friedhofer, Michael (Department: 2832)
Electricity: circuit makers and breakers
Combined with or actuated by connector coupling
Meeting contacts of coupling members forming switch contacts
C200S051060
Reexamination Certificate
active
06303883
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a power plug, more particularly to a power plug having a switch provided thereon.
2. Description of the Related Art
FIG. 1
illustrates a conventional power plug
1
for an electrical receptacle
10
. The power plug
1
includes an insulative housing
11
provided with an electric wire
12
that projects from a rear side of the housing
11
and that has first and second conductors
121
,
122
and a ground conductor
123
, a pair of parallel power plug blades
112
and a ground pin
113
projecting outwardly from a front side of the housing
11
. Portions of the power plug blades
112
and the ground pin
113
are encapsulated in the housing
11
to electrically connect with the first and second conductors
121
,
122
and the ground conductor
123
, respectively.
The power plug
1
is disadvantageous in that when it is applied to a receptacle which is not provided with an On/Off switch, it can be relatively inconvenient to pull out the same from the receptacle or re-plug the same into the receptacle whenever there is a need to disconnect the same from or re-connect the same to the receptacle. Moreover, chances for the power plug
1
or the receptacle to be damaged are higher when frequency of the pulling and re-plugging operations is higher.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a power plug with a switch that is capable of overcoming the aforementioned drawbacks.
According to the present invention, a power plug comprises: an insulative seat having a base and a post projecting upwardly from the base, the base having a pair of slits formed therein at two opposite sides of the post; opposite arc-shaped first and second conductive plates projecting upwardly from the base and spaced radially apart from the post, the first conductive plate being adapted to be connected to a first conductor of an electric wire; first and second power plug blades secured to the base, and projecting downwardly and respectively from the base through the slits, the first power plug blade being adapted to be connected to a second conductor of the electric wire, the second power plug blade being electrically connected to the second conductive plate; and a switch mounted rotatably on the post, and having an end wall disposed above the base, a peripheral wall projecting downwardly from the end wall toward the base, and extending circumferentially to surround the first and second conductive plates, and a conductive arc-shaped bridging plate mounted on the peripheral wall, the switch being turnable about the post between a first position, in which the bridging plate bridges the first and second conductive plates, and a second position, in which the bridging plate disconnects the first and second conductive plates.
REFERENCES:
patent: 3943310 (1976-03-01), Gertz
patent: 4008382 (1977-02-01), DeRosa
patent: 4969833 (1990-11-01), Lindow et al.
patent: 5193665 (1993-03-01), Jankow
Chi-Wen Chen
Friedhofer Michael
Ohlandt Greeley Ruggiero & Perle L.L.P.
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