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Патент USA US2406154

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Aug. 20,1946.
M‘. MEDLIN
\ 2,406,154
FUSED ELECTRICAL PLUG
Filed Oct. 12, 1944
INVENTéR.
MILTON MEDL IN
B"
W
A TTOK/UE y,
Patented Aug. 20, 1946
2,406,154
UNITED STATES PATENT OFFICE
. 2,406,154
FUSED ELECTRICAL PLUG
.Milton .Medlin, Brooklyn, N. Y.
Application October 12, 1944, Serial :No. 558,344
.3 Claims. (Cl. zoo-115.5)
1
2
This invention ‘relates to new (‘and useful im
fuses to act as an individual fuse for an velec
tric object such as a lamp, electric toaster or
In the accompanying drawing vforming a ma
terial part of this disclosure:
Fig. 1 is a perspective view of an electric plug
constructed ‘in accordance with this invention.
Fig. 2 is an elevational view of the electric plug
shown in Fig. 1 with a section of the casing re
the like, connected with the plug. 'Heretofore,
moved to disclose interior parts.
provements in electric plugs.
The invention proposes a, new and improved
electric plug which is provided with a fuse or
‘
Fig. '3 is a fragmentary enlarged sectional view
it was customary to construct commercial elec
of the electric plug shown in Figs. '1 and 2, this
tric plugs without fuses and to depend upon a
main fuse for protection. However when a short 10 section being as though taken on the line '3—3
of Fig. 1.
circuit occurred in any one of the objects asso
Fig. 4 is a fragmentary enlarged ‘sectional view
ciated with the main fuse whichcaused the main
fuse to blow, it often required great skill to de
test just where the short was located. The short
could be in a lamp, or electric wire, or other ob
ject, and yet be of such a nature that it is rela
taken on the line 4-4 of Fig. 3.
_
Fig, 5 is a fragmentary enlarged sectional ‘view
15 of the electric plug shown in Fig. 1, this view
being as though taken on the line '5—5 of Fig. '2.
Fig. 6 is an elevational view of an electric plug
constructed in accordance with a modi?ed form
of this invention, a portion of the sectional cas
rupted when a short develops, and one of ‘the 20 ing being broken away to disclose interior parts.
Fig. '7 is a fragmentary enlarged vertical sec
fused electric plugs has its fuse blown.
tional view of the electric plug shown in Fig. 6,
More speci?cally, the invention proposes an
this view being as though taken on the line 'l-‘l'.
improved fused electric ‘plug which is character
of Fig. 6.
ized by a sectional casing of insulation material
having its sections releasably connected together 25 The fused electric plug, in accordance with that
form of the invention ‘disclosed in Figs. 1-5 in
and having recesses formed between their con
tacting faces. It is proposed to provide termi
clusive, includes a sectional casing I'll of insula
tion material having its sections 1 I and l2>releas~
nals for electric leads, mounted within saidre
ably connected together with bolts and ‘nuts l3.
cesses and provided with clips for receiving and
Recesses H! are formed between the contacting
‘holding one of the ends of the fuses. ‘It is also
faces of the sections II and i2,
proposed to provide prongs for engagement into
Terminals [5 for electric leads are mounted
an electric connector, and also mounted within
within portions of the recesses Hi. The terminals
said recesses and spaced from said terminals and
i5 are provided with clips l6 for receiving and
provided with clips for receiving and holding the
holding one of the ends of the fuses ll. Each
other ends of said fuses. It is contemplated that
the fuses shall be in the nature of fusible strips,
terminal 15 is formed from metallic sheet mate
rial. Each terminal l5 includes ‘a strip portion
or the standard fuse capsules may be mounted
bent upon itself forming adjacent arms Ha. The
between said clips.
ends of these arms Ila are slightly ?ared for
It is another object of the invention to so con
struct the sectional casing that the recesses eX 40 forming clip portions or clips [6. One of the
arms Ila is provided with a base lug l8 engaged
tend into each of the sections thereof.
by a terminal screw l9 beneath which the ends
The invention also proposes a certain simple
of the leads 26 are clamped.
and ef?cient construction of the terminals and
Prongs 2|] for engaging an electrical connector
the prongs used in the fused electric plug.
are mounted within other portions of said re
Another object of the invention is the con
cesses l4 and project from one of the ends of
struction of a device as mentioned which is sim
the casing E0. The inner ends of the prongs 26
ple and durable and which may be manufactured
are spaced from the terminals I5 and are pro
tively di?icult to detect. 'With the improved elec
tric plug only a restricted portion of the house
circuit, or other protected circuit, will be inter
and sold at a reasonable cost.
vided with clips 2| for receiving and holding the
For further comprehension of the invention, to other ends of the fuses [1. Each prong 20 is
and of the objects and advantages thereof, ref
formed from a metal strip which is bent upon
erence will be had to the following description
itself to form adjacent arms, the free ends of
and accompanying drawing, and to the append
which are formed into clip portions or clips 2|.
ed claims in which the various novel features of
One of the arms of each prong 20 is formed with
55 a laterally offset portion 22 engaging within
the invention are more particularly set forth.
2,406,154
3
4
complementary portions of the recesses l4.
These offset portions 22 serve to hold the
prongs 2!] from coming out of the casing ID.
holding one of the ends of fuses mounted upon
and within the recesses of one of said sections,
and prongs for engaging an electric connector
The recesses [4 of the sections II and I2 are
mounted upon and within the recesses of said
of equal depths, and are shaped or fashioned to
section, each of said prongs comprising a metal
hold the prongs 20 and the terminals I5 cen
strip bent upon itself and having its ends within
trally between the casing sections. The fuses II
said section and separated and formed into clip
are in the nature of fuse strips which are mere
portions for holding the other end of one of said
ly placed between the clip portions l6 and 2|.
fuses, and one of the arms of each prong having
The sections II and I2 of the casing II] are also 10 an offset portion engaging complementary por
formed with recesses 23 in which extra fuse strips
tions of said recesses for holding the prongs from
H’ are normally stored. When the fuses I‘! blow,
coming out.
the electric plug may be re-fused by using the
2. In a fused electrical plug, a sectional cas
fuse strips H '.
ing of insulation material having its sections re
The prongs 20 are resiliently maintained in 15 leasably connected together and having recesses
one of the sections of the casing I0, namely the
formed between their contacting faces, clips for
section 12, by small projecting portions 25 formed
holding one of the ends of fuses mounted upon
in one of the corners between the offset portion
and within the recesses of one of said sections,
22 and the adjacent arm of the prong, and
and prongs for engaging an electric connector
engage complementary recessed portions 26' 20 mounted upon and within the recesses of said
formed in the section [2, half way down the re
section, each of said prongs comprising a metal
cess 14 thereof. Each recess 14 has a central en
strip bent upon itself and having its ends with
larged portion at the area where the fuses ll are
in said section and separated and formed into
located, forming a space with facilitates engage~
clip portions for holding the other end of one of
ment and disengagement of the fuses, and which 25 said fuses, one of the arms of each prong hav
also forms an air space useful when the fuses '
ing an offset portion engaging complementary
blow.
portions of said recesses for holding the prongs
The fuses I‘! may be removed, and then the
from coming out, and each prong having a small
clip portions 2| of the prongs 20 may be pressed
projecting portion engaging a complementary
together so as to move the projecting portions 25
recessed portion of said recesses for holding the
out of the recessed portions 26' which frees the
prong on said section of said casing.
prongs 20 so that they may be removed.
3. In a fused electrical plug, a sectional cas
In Figs. 6 and 7 a modi?ed form of the inven
ing of insulation material having its sections re
tion is disclosed which is very similar to the
leasably connected together and having recesses
prior form, distinguishing merely in the fact that 35 formed between their contacting faces, clips for
the terminals l5 are provided with clip portions
holding one of the ends of fuses mounted upon
l6’ and the prongs 20 are provided with com
and within the recesses of one of said sections,
plementary clip portions 2|’, which clip portions
and prongs for engaging an electric connector
are adapted to engage and hold fuses ll". These
mounted upon and within the recesses of said
fuses ll” are of the capsule type.
section, each of said prongs comprising a metal
In other respects this form of the invention is
strip bent upon itself and having its ends with
identical to the previous form and like parts are
ing said section and separated and formed into
identi?ed by like reference numerals.
clip portions for holding the other end of one of
While I have illustrated and described the pre
said fuses, one of the arms of each prong having
ferred embodiments of my invention, it is to be
an offset portion engaging complementary por
understood that I do not limit myself to the pre
tions of said recesses for holding the prongs, from
cise constructions herein disclosed and the right
coming out, and each prong having a small pro
is reserved to all changes and modi?cations com
jecting portion engaging a complementary re
ing within the scope of the invention as de?ned
cessed portion of said recesses for holding the
in the appended claims.
prong on said section of said casing, said small
Having thus described my invention, what I
projecting portion being located near the clip
claim as new and desire to secure by United
end of the prong so as to be disengageable from
States Letters Patent is:
the complementary recessed portion when the
1. In a fused electrical plug, a sectional casing
of insulation material having its sections releas
together.
ably ‘connected together and having recesses
formed between their contacting faces, clips for
arms of the clip end of the prong are pressed
MILTON MEDLIN.
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