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Description  |
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SUMMARY OF THE INVENTION
An improved safety end-connector used for extension cord, it is featured in
that the improved receptacle has a circuit protection fuse, a
detachable/attachable fuse box for easy inspection and replacement, the
lead-in wires of the cord are clamped firmly by the tail clamp of the
base, each pair of socket openings is protected by a shutter slide, an
indicator lamp is furnished for locating out the receptacle during night
time or in a dark place, also it functions, as a trouble indicator. This
improved receptacle utilizes only a few simple parts, and it can be easily
assembled, in addition, it is convenient and safe in use.
The socket is generally utilized as an electric power outlet port for
supplying electric power to an electrical appliance, especially
receptacles provided with plural pair of socket openings, they are widely
adopted in household, industrial, and commercial use, since each
receptacle can provide several pairs of socket openings for receiving
several plugs at the same time, therefore, it is practical and convenient
for daily life use. Though receptacles are so popularly utilized nowadays,
there still exists shortcomings to be improved such as:
1. They comprises of many complex parts, and screws are utilized to
assemble them into workable products, therefore, they are both labour and
cost consuming.
2. The pole pieces of the socket are complex in shape, higher cost should
be spent for producing them.
3. The clamping ends on pole pieces of the sockets frequently lose their
resiliency due to contacting resistance heat or material fatigue, which
leads to poor electric current conduction.
4. When power in not available from the receptacle, the trouble can not be
identified immediately whether the trouble comes from the socket itself,
the plug of the extension cord or the extension cord.
In addition, there are other shortcomings existed in the traditional
receptacles, for example: the openings for the clamping ends on pole
pieces of the sockets can easily be blocked up by unecessary plastic
chips; the plastic receptacle base can be softened or even melted by high
temperature produced by resistance heat, which increases the danger of
fire as a result of the short-circuit therefrom; the openings for the
clamping ends on pole pieces of the socket can easily accumulate dirts,
also they provide passages for moisture going into the receptacle which
may create electricity leakage the worst of all is the socket opening can
be easily accessed by children, if metal objects such as hair pins or a
paper clip is accidentally inserted into it by a child, electric shock to
the child may cause injury or even fatality; and the lead-in wires of the
power cord as they are connected to their respective conducting strips can
be easily broken off from connection by a moderate pull, or gradually
become loose, or insulations gradually become hardened and stripping-off
due to built-up high temperature from resistance heat at the connecting
points, the worst thing is the consequence of short-circuit.
The main object of the present invention is to provide an improved safety
end-connector used for extension cord, which is featured in that by
utilizing a base, a cover, flat conducting strips, a fuse, a fuse box, an
indicator lamp, and shutter plates etc. parts through simple positioning
and assembly, a novel, safe, and practical receptacle is created.
The next object of the present invention is to provide an improved safety
end-connector used for extension cord, which is featured in that each
individual, socket of the receptacle is protected by a fuse as it is
connected to one of the conducting strip of the receptacle, also its fuse
box can be easily detached/attached for fuse replacement or inspection.
The other object of the present invention is to provide an improved safety
end-connector used for extension cord use, in which, the tail end of the
base is provided with a lead-in wire clamp through the clamping action of
this wire clamp and the retaining action of the cover, the lead-in wires
of the extension cord are firmly fixed in the receptacle and good
conducting efficiency at their connection points is secured therefrom.
One further object of the present invention is to provide an improved
safety end-connector use for extension cord, of which, across the
connection points of the lead-in wires and the conducting strips, it is
provided with an indicator lamp by cramping method, said indicator lamp is
utilized as a trouble indicator to help locating the spot where the
trouble stems from a power failure, breaking down of the receptacle or,
the plug of the extension cord, or the extension cord.
The further object of the present invention is to provide an improved
safety end-connector used for extension cord, in which, each socket
openings is provided with a shutter slide, when the receptacle is not in
use, it is switched to close for preventing them from accumulating dirts
or moisture, or causing electric shock injury or even death when a child
accidentally inserts metal objects into them.
The present invention, an improved safety end-connector used for extension
cord, will be best understood from the following description of embodiment
when read in connection with the accompanying drawings.
DESCRIPTION OF THE DRAWINGS
FIG.1 is the top side perspective view of the improved safety end-connector
used for extension cord use of the present invention.
FIG. 2 is the bottom side perspective view of the improved safety
end-connector used for extension cord use of the present invention.
FIG. 3 is the exposed perspective view of the improved safety end-connector
used for extension cord use of the present invention.
FIG. 4 is the perspective exposed view for the bottom side of the base, the
shutter slides, the fuse, and the fuse box of the present invention.
FIG. 5 is the sectional view at A--A of the improved safety end-connector
used for extension cord use of the present invention, it also illustrates
the switching action of the shutter slides.
FIG. 6 is an illustration showing a closing shutter slides in accordance
with the present invention.
Refer to FIGS. 1, 2, and 3, the improved safety end-connector used for
extension cord use of the present invention comprises: a base 2,
conducting strips 3, two lead-in wires 4, an indicator lamp 5, a fuse box
6, a fuse 7, shutter slides 8, and a cover 9. In which, the base 2 is
provided with plural pairs of socket openings 21a, 21c distributed
uniformly at left and right sides of the base longitudinal axis, also
in-line with the inner sides of these plural pairs of socket openings at
both the left and right side of the base longitudinal axis, they are
provided with a left and a right conducting strip troughs 22a and 22b; and
inbetween these two conducting strip troughs 22a and 22b, it is provided
with a fuse compartment 23 and an indicating through-hole 24; the tail end
of the base is extended outwardly and formed into a tail clamp 25; the
tail clamp 25 comprises of a bottom clamp 25a and a fastening clamp 25b;
on top side of each pair of socket openings of the base 2, it is provided
with respective depressed sliding ways 26a and 26b; the conducting strips
3 comprises of a positive pole conducting strip 3a, and a negative pole
conducting strip 3b and an U-shaped positive pole fuse clip 3c; the
conducting strip 3a and 3b are crampingly connected to their respective
lead-in wires 4a and 4b; the left end of the conducting strip 3c is
extended and bent leftward then formed into a fuse clip 31c which is
installed in the left side conducting strip trough 22a of the base 2,
while the positive and negative pole conducting strip 3a and 3b, are
installed respectively in the right side conducting strip trough 22b and
the rear end of the fuse compartment 23; the out extending portions of the
lead-in wires from the base are clamped firmly by the bottom clamp 25a and
fastening clamp 25b of the tail clamp 25 of the base 2, furthermore an
indicator lamp 5 is crampingly connected to the connecting points between
lead-in wires and the positive and negative pole conducting strips 3a and
3b, and it is housed in the indicating through-hole 24, the indicator lamp
is filamentless type, it has an extended service time; the fuse box 6 has
an integrated front panel 61 and a downward extended portion 62, the space
between them is utilized for receiving a fuse 7, when a fuse is inserted
therebetween and the fuse box 6 is pushed into the fuse compartment 23,
the two conducting ends 7a and 7b of the fuse 7 will be engaged on the
V-shaped positive pole fuse clip 3c and the fuse clip 31c on conducting
strip 3b, in this way, a protective circuit is formed therefrom.
Refer to FIG. 4, it can be seen that at each sliding way 26a and 26b on the
top side of said base 2, they are provided with respective shutter slides
8a and 8b, on the shutter slides, they are provided with respective socket
through-openings 81a and 81b, and poking bosses 82a and 82b, the socket
through-openings 82a and 82b on each shutter slides 8a or 8b will be
aligned with the pair of socket openings 21a or 21c underneath them on
said base 2 when they are switched to an open position via the poking
bosses 82a or 82b. After the abovesaid conducting strips 3, indicator lamp
5, fuse box 6, shutter slides 8 are all installed and positioned in the
base 2, then is inserted into the cover 9, at this time, the protruded
clipping pieces 251a and 251b at the tail end on both top and bottom sides
of said base 2 will be clipped onto the clipping dent 91a and 91b at the
rear end on both the top and bottom inner surfaces of said cover 9, in
such manner, said base 2 and cover 9 can be positioned and connected
together firmly; on the top side of said cover 9 at the corresponding
locations with respect to said base 2, they are provided with multiple
pair of socket through-openings 92a and 92c for receiving plugs, and
multiple poking bosses through-openings 93a and 93b for switching the
shutter slides 8a and 8b to their respective open or close positions via
poking bosses 82a and 82b, also on both the top and bottom sides of said
cover 9, they are provided with indicating windows 94a and 94b for viewing
the light emitted form the indicator lamp 5.
When the fuse box 6 is installed with a fuse 7, and the fuse box 6 is
pushed firmly into the fuse compartment, then the whole circuit of the
extension cord and receptacle assembly is protected by the fuse 7 for
safety, when said fuse 7 is blown out, any person can replace it without
safety consideration, furthermore, when the plug end of the extension cord
and the receptacle assembly is connected to the power source, the
indicator lamp 5 will become lightened, especially in night time it
indicates the location of the receptacle, also said indicator lamp 5 is
utilized as a trouble indicator for trouble shooting, purpose such as:
when the indicator lamp lights, but the sockets of the receptacle do not
supply electric power, the trouble may come from a broken fuse or improper
contact of the receptacle itself; if the indicator does not light, the
trouble may come from the power failure, the cord, or its plug, in
addition, such pair of socket openings on the receptacle can be switched
to an open position when it is to be utilized (as shown in FIG. 5) by the
poking boss 82a and 82b on said shutter slide 8a or 8b for receiving the
plug of a electric appliance, or switched to close(as shown in FIG. 6)
when it is not used for preventing it from cumulating dirts or moisture
going in, whereby, the life time of the receptacles lenghtened and the
electric safety is maintained; moreover, the lead-in wires of the cord is
clamped firmly by the tail clamp 25 of said base 2 and it is further
harnessed by the cover 9, therefore, they can not be easily pulled off
from their connecting points.
For further explanations, the advantages of the improved safety
end-connector used for extension cord use of the present invention are
listed as follows:
1. It is simple in structure, can be easily assembled, it saves both
man-hour and production cost, also it is safe and practical in use.
2. Plate conducting strips are adopted, in addition to its low production
cost it also possisses a larger electric conducting surface.
3. It is protected by a fuse, therefore it is safe in use.
4. It is provided with an easy detachable/attachable fuse box, the
inspection or replacement of the fuse can be easily achieved.
5. The lead-in wires of the cord is clamped down firmly by the tail clamp
of the base and it is further held by the cover, and it can not be easily
pulled off from their connecting points, whereby its service life is
lengthened while its electric safety is maintained.
6. It is provided with a lamp light which emits light from both top and
bottom sides of the receptacle for locating the receptacle during night
time or in a dark place. It is also utilized as a trouble indicator for
serving trouble shooting purpose.
7. Each pair of the socket openings are provided with respective shutter
slides, so that when they are not in use, they can be switched to a close
position for preventing them from cumulating dirts or moisture, or causing
electric shock injury or fatality when a child unintentionally inserts
metal objects into them.
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