Electrical connectors – With coupling movement-actuating means or retaining means in... – Bayonet coupling part movable about its axis
Reexamination Certificate
2003-11-25
2004-08-10
Bradley, P. Austin (Department: 2833)
Electrical connectors
With coupling movement-actuating means or retaining means in...
Bayonet coupling part movable about its axis
C439S159000
Reexamination Certificate
active
06773289
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electrical plug mechanism and an electrical receptacle, and in particular to an electrical plug and an electrical receptacle for use in at least two electrical cells in series or in parallel which can avoid electrical shock and generate electrical current with more amperes.
2. Description of Related Art
When two electrical cells, such as, for example, two electrical cells of an uninterrupted power system (UPS), are in series or in parallel, a user may receive an electrical shock because an electrical plug and electrical receptacle of the electrical cell are electrically connected and the user does not know which part of the electrical plug and the electrical receptacle carry electrical current. Thus, a technical solution to the situation is necessary.
To overcome the shortcomings above, as shown in
FIGS. 1 and 2
, a conventional electrical plug
4
has a plurality of pins
41
which are respectively enclosed by tubes
42
, and a gap
43
is positioned between the pins
41
and the tubes
42
. An isolation end
411
is positioned in each of the pins
41
, and each of the pins
41
is enclosed by an arch-shaped spring
412
.
Referring to
FIGS. 1 and 2
, a conventional electrical receptacle
3
has a housing
31
, and a plurality of holes
33
are defined in the housing
31
and correspond to the pins
41
of the conventional electrical plug
4
. Further, a gap
34
is positioned between the housing
31
and each of holes
33
and corresponds to each of the tubes
42
of the conventional electrical plug
4
. Thus, when the conventional electrical plug
4
is inserted in the conventional electrical receptacle
3
, the arch-shaped spring
412
is electrically connected with the inner surface (not shown) of each of the holes
33
. In addition, the conventional electrical receptacle
3
also has a recess
321
of an extension
32
, which is sized to receive the conventional electrical plug
4
. As described above, the conventional electrical receptacle
3
and the conventional electrical plug
4
are electrically connected and isolated from the environment so the user is not likely to receive an electrical shock.
However, the pins
41
of the conventional electrical plug
4
are electrically connected with the holes
33
of the conventional electrical receptacle
3
via the arch-shaped spring
412
. Contact between the pins
41
and the arch-shaped spring
412
thus results in high resistance and high thermal temperature, known as “the second contact”. In addition, the pins
41
are isolated from the environment by the tubes
42
, but the design of the electrical equipment must conform to safety standards for electrical equipment that prevent the user's fingers from penetrating into the holes
33
and receiving an electrical shock, so the diameter of tubes
42
cannot be extended and maximum electrical current of the pins
41
cannot exceed 25 amperes. In this regard, the conventional electrical receptacle
3
and the conventional electrical plug
4
are only suitable for an electrical current less than 25 amperes.
Thus, there is need to develop an electrical plug mechanism and an electrical receptacle for use in at least two electrical cells.
SUMMARY OF THE DISCLOSURE
It is an object of the present invention to provide an electrical plug mechanism and electrical receptacle to avoid electrical shock.
It is an object of the present invention to provide an electrical plug mechanism and electrical receptacle that has low resistance and thermal temperature and carries an electrical current greater than 25 amperes.
In order to accomplish the object of the present invention, the present invention provides an electrical plug mechanism and an electrical receptacle. The present invention includes an electrical plug, a plug guard and an electrical receptacle. The electrical plug has an end surface, and a plurality of protruding plates and a plurality of holes defined on the end surface. A plurality of shafts correspond to and travel through the holes of the end surface. The plug guard has hollow protrusions corresponding to the protruding plates of the electrical plug, grooves corresponding to the hollow protrusions and holes corresponding to the shafts. The electrical receptacle has holders corresponding to the protruding plates.
REFERENCES:
patent: 4737124 (1988-04-01), Ezure et al.
patent: 4789759 (1988-12-01), Jones
patent: 4802864 (1989-02-01), Michaels et al.
patent: 4820176 (1989-04-01), Niikura
patent: 5118301 (1992-06-01), Bentivolio
patent: 5171291 (1992-12-01), d'Alayer de Costemore d'Arc
patent: 5429516 (1995-07-01), d'Alayer de Costemore d'Arc
patent: 5480313 (1996-01-01), d'Alayer de Costemore d'Arc
patent: 5655916 (1997-08-01), Hayashi
patent: 5921798 (1999-07-01), Ursich
patent: 6206714 (2001-03-01), Bernardini
Chen Wen-Chi
Liang Greg
Lin Ping-Kung
Allis Electric Co., Ltd.
Bradley P. Austin
Nguyen Phuongchi
Rosenberg , Klein & Lee
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