U.S. patent number 3,585,555 [Application Number 05/019,968] was granted by the patent office on 1971-06-15 for adapters for electrical wall receptacles.
Invention is credited to Kingo Yamada.
United States Patent |
3,585,555 |
Yamada |
June 15, 1971 |
ADAPTERS FOR ELECTRICAL WALL RECEPTACLES
Abstract
A protective electrical arrangement for use in conjunction with
a wall receptacle or similar outlets of the female type commonly
employed in homes and buildings. The protective device is integral
with the outlet circuitry and consists of a plurality of circuit
breakers, wherein one of the breakers is adapted to open the
circuit or connected line before any other protective device
operates.
Inventors: |
Yamada; Kingo (Waipahu,
HI) |
Family
ID: |
21796050 |
Appl.
No.: |
05/019,968 |
Filed: |
March 16, 1970 |
Current U.S.
Class: |
337/187; 337/197;
337/269; 337/198 |
Current CPC
Class: |
H01R
13/713 (20130101) |
Current International
Class: |
H01R
13/70 (20060101); H01R 13/713 (20060101); H01h
085/02 () |
Field of
Search: |
;337/187,197,198,200,268,269,1,2,3,4,113 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Harris; G.
Assistant Examiner: Bell; F. E.
Claims
Having thus described my invention, what I claim and believed new
and which is desired to be secured by Letters Patent is:
1. An attachable platelike container for combination with an
electrical outlet receptacle, prongs extending from one side of the
container arranged to be inserted into contact openings of an
electrical receptacle, an opposite side of the container having at
least one female outlet adapted to receive a portable electrical
attachment plug, a pair of circuit breakers fixed to the container
and arranged in series connection, one of the breakers designed to
open earlier than the other breaker, one end of the series
connection having a conductor leading to one of said prongs and the
other end of the series connection having a conductor leading to
one electrical side of said female outlet, and a conductor
connecting the other of said prongs to the other side of said
female outlet and thus provide the female outlet with a plurality
of protective circuit breakers.
2. The container recited in claim 1 wherein one of the breakers is
a fuse.
3. The container recited in claim 1 wherein one of the breakers is
a fuse and the other breaker is an electromechanical breaker which
has a reset rod that extends through a wall of the container.
4. The container recited in claim 1 wherein one of the breakers is
a fuse and the other breaker is an electromechanical breaker, a low
current lamp arranged so that its glow can be seen from without the
container, said lamp having a pair of leads which shunt about the
fuse and is illuminated when the fuse is broken.
5. The container recited in claim 1 wherein one of the breakers is
a fuse, and means allowing the fuse to be replaced from outside of
the container.
6. The container recited in claim 1 wherein the front face of the
container has a plurality of female outlets and wherein some of the
outlets have connection directly across said prongs whereas other
outlets have double breakers as aforesaid.
7. The container recited in claim 1 wherein one of the breakers is
a fuse and the other breaker is an electromechanical breaker, and
wherein the fuse is set and designed to open the circuit at a
higher current than the electromechanical breaker.
Description
This invention concerns electrical outlets and the like which
embody certain safety and overload devices.
An important object of the invention is the provision of protective
means in combination with an electrical wall receptacle or similar
outlets of the female type commonly employed in homes and buildings
of all kinds. The protective means is intimate with the outlet per
se and hence independent of the usual and well known protective
devices associated with entrance line service and various wiring
panels.
Another object is a series connective arrangement of protective
devices wherein one of the devices is designed to open an
electrical circuit earlier than the other protective devices that
may be connected in an electrical circuit; the protective devices
being proximate the outlet whether placed upon a sidewall, ceiling
or floor.
Still another object is to provide a plurality of protective
devices in an electrical circuit within a connector platelike box
or housing having an outlet or outlets to which a detachable
portable electrical plug or plugs are to be connected, and which
box is provided with said devices that consists of a plurality of
circuit breakers; and wherein one of the breakers is adapted to
open the circuit or connected line before any other protective
device operates.
Other objects will be apparent upon reading the specification and
the drawings attached thereto.
In the drawings:
FIG. 1 is a side elevational view of a platelike container or box
provided with a plurality of outlets to which portable cords can be
readily attached;
FIG. 2 is an elevational view of the backside of that shown in FIG.
1;
FIG. 3 is a top plan view of the container or box;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is an elevational view of one end of the container;
FIG. 6 is an elevational view of the other end thereof;
FIG. 7 is an elevational view of the container shown on a large
scale with the front face thereof removed;
FIG. 8 is an enlarged view of an indicator unit;
FIG. 9 is an enlarged view of a fusing unit;
FIG. 10 is a schematic showing of the wiring system within the
container.
As illustrated in the drawings, the reference character 1 indicates
a platelike container, box or casing having a front side or face 2,
a backside 3 that can be removed if and when necessary, a top side
4, bottom side 5, and the end surfaces or sides 6 and 7. All these
sides are spaced-apart to provide a chamber 8 in which is housed
various equipment. The container in this particular case is adapted
to be attached to an ordinary wall type of receptacle after its
cover plate has been removed, that is, this platelike container 1
is substituted for the usual plate which is to be discarded. The
container 1 has the usual male attachment pins or prongs for
attachment to a twin type of wall receptacle. This platelike
container 1 has the pair of opposite pole pins 9 and 10 and another
pair of opposite pole pins 11 and 12. However, the container may
have only two such pins when it is designed to be attached to a
wall receptacle that has only a single outlet.
A number of double pin female outlets are provided in the face of
the container and are shown at 13, 14, 15 and 16. These outlets are
embodied in a suitable base which is generally round and which is
fixed securely to the inner side of the backside or plate member 3,
and this is best shown in FIG. 7 of the drawings. Obviously, any
number of such outlets may be provided and also, in some cases, the
wall outlet may be but a single one. In this case, as shown, the
top outlets 13 and 15 are connected directly across the supply
lines 17 and 18 and 19 and 20, respectively, as shown.
The other two outlets 14 and 16 have special overload protection
and which operate to open the line in case of short circuits. These
outlets can receive portable cord plugs from special portable heavy
current using devices such as heaters, various ray equipment,
electric motors etc. A casing with a circuit breaker therein is
shown at 21 and which has a projected reset button 22. This breaker
is of the well-known electromechanical type. The casing 21 is fixed
to the wall 7. Such a circuit breaker may be like the one shown in
Catalog sheet 40107-B-0868 of the E-T-A Products Company of
America, Chicago, Ill. 60646.
A meltable fuse-type breaker is shown at 23 along with a companion
neon light unit at 24. These units are fixed to the bottom wall 5
of the platelike container 1. In the central portion of the
container there is a block of insulating material 25 which
accommodates the attachment pins 9--10 and 11--12. This block is
fixed to the backwall 3 in any suitable manner.
The fuse-type breaker 23 is shown in sufficient detail in FIG. 9.
It consists of a casing means 26 having a neck portion 27 which
extends through an opening in the wall 5 and which is removably
capped by the means 28. The casing means is fixed to wall 5. In
this casing there are the metal spring clips 29 and 30 which are
fixed to the wall thereof and from which clips extend the connected
wires 31 and 32, as shown. The fuse 33 has the usual transparent
casing with conductor end caps which fit into the clips and make
good electrical contact therewith. A headed rigid rod 33' has one
end fixed to the outer end cap of the fuse so that the fuse can be
removed and replaced by a person's fingers. Each clip has a wire,
indicated at 34 and 35, which lead to the neon tell-tell lamp means
24. This tell-tell means 24 has the casing 36 with an open neck
portion 37 which extends through a bore in the wall 5 and can thus
be readily seen.
The wires 34 and 35 have a resistor 38 in series therewith and also
the neon lamp 39. The electromechanical circuit breaker will open
the circuit first before the soft metal of the fuse break or open
the circuit. The value of the fuse in the circuit arrangement shown
will exceed by 50 percent of that value in the setting of the
electromechanical circuit breaker. The fuse will melt or blow
within less than a second if a short circuit occurs any place along
the line or in the units connected therein. A time factor is
involved in the electromechanical circuit breaker and the chart
below shows the various tripping times at 70.degree. F.
This invention has its advantages for greater safety in electrical
circuits in that the circuit is quickly opened to protect connected
equipment connected therein. The fuse will melt within less than a
second, as before stated, however, due to the electromechanical
circuit breaker, it is capable of detecting defective equipment in
the line before the problem gets worse or dangerous and thus might
do damage to connected equipment or things around it. Another
advantage of the electromechanical breaker is that it could
withstand a surge of high current in the line. For instance, the
electromechanical breaker may be set at 3 amperes and the fuse of a
size to carry current up to 6 amperes.
This chart below shows tripping times for a mechanical breaker at a
temperature of 70.degree. F: ##SPC1##
Therefore, this invention protects an electrical circuit from short
circuits and overloads in a most efficient manner.
Certain novel features and details of this invention are disclosed
and in some cases in much detail, and in order to make the
invention clear. However, it is to be understood that this
invention is not limited to the exact details disclosed since it is
apparent that various modifications and changes may be made without
departing from the scope of the invention as claimed.
* * * * *