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Патент USA US2115469

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April_26, 1938.
5. QUISLING
FUSE INDICATOR
Filed Feb. 6, 1935
2,1 15,469
Patented Apr. 2c, 1938
2,115,469
FUSE mlcs'ron I
Sven-re Quisling,
son, Wis.
Application February 6, 1935, Serial No. 5,189
a
(Cl. 200-121)
been employed to this end, with varying degrees of
Fig. 4 is a perspective view of a further modi
flcation of the indicator strip.
Fig. 5 is a perspective view of a further modi
?cation of the indicator strip.
Referring to the drawing in detail, a common 5
plug type fuse is illustrated. The fuse plug com
prises the usual body I, fusible element 2, obser
vation window 4 and metal cap 3. The body i
satisfaction.
may be formed of porcelain or other suitable in
This invention relates to indicators for electric
fuse cutouts of that type having an observation
window therein.
Since fuse plugs were ?rst introduced, some
, 5 means has been sought whereby positive indica
tion of the condition of the plug may be had at
a glance.
Various means and methods have
,
A thin strip of specially treated paper placed
across the body of the plug above the fusible ele
ment has been tried. Upon burning out, the
heat from the melting element- ignites and burns
this paper. If the fuse box is located in a dark
15 place, as is usually the case, the condition of the
fuse cannot be told unless an independent source
of illumination is provided.
Another method employed is the use of lumi
nescent paint applied directly to the fuse element.
However, in practice, it has been found that this
20
paint applied to the electrical current carrying
element deteriorates rapidly due to the heat pro
duced‘ by the current passing through the ele
' ment.
Although the luminescence disappears, in
held therein between the upper face of the body
portion and the observation window or the metal
cap. This ribbon is of a length greater than the 15
diameter of the fuse plug body I, and has its mid
portion bent downwardly away from the obser
vation window 4. The ribbon is thus held with
its midportion suspended below the window 4
and above the fusible element 2 in spaced relation 20
to both the window 4 and the element 2.
The upper surface of the ribbon 5 bears a suit
able marking, such as the letters “O. K.” or the
like, and is coated with a light colored, lumines
plug is ‘actually in perfect condition, hence, this
cent paint 6. The marking will be clearly visible 25
thru the window 4 in daylight, while at night
method has been found impractical. These and
the luminescent paint will glow softly, indicating
various other methods may, in a sense, give some
the perfect condition of the fuse.
25 dicating a plug apparently burned out, still the
indication of the condition of the fuse plug, but it
30 is obvious that they fall short of a satisfactory
solution of the problem.
The object of the present invention is to provide
a fuse plug having more positive means to indi
cate the actual condition of the fuse at any time,
35 and under any and all conditions.
Another object of the invention is to provide
indicating means which can be applied to arm
fuse plug of ordinary construction without re
quiring any structural changes in manufacture
40 and with very little added cost.
With these and other objects in view, which
will be seen in the description as it progresses,
the invention resides in certain novel features of
construction hereinafter described and claimed.
45 It is 'of course understood that changes may be
made from the embodiment shown which fall
within the scope of the claims.
In the drawings:
Fig. 1 is a vertical sectional view of a fuse plug
constructed in accordance with the present in
vention;
Y
sulating material.
10
A ribbon 5 of any suitable material, for example,
paper, is placed within the fuse plug body, and
Fig. 2 is a plan view of the plug with the metal
cap removed; and
Fig. 3 is a perspective view of a slightly modi?ed
form of indicator strip.
‘
The upper surface of the ribbon is coated with
a light-colored luminescent paint 6, which may 30
include such ingredients as the sul?de salts of
zinc, barium, calcium, or strontium, singly or
combined, and, if it is desired to provide a coat
ing which is visible in a constantly dark place,
radio-active substances, such as compounds of 35
mesothorium, thorium or uranium salts, may be
added.
The lower surface of the ribbon is coated with
a relatively poorly in?ammable adhering material
‘I, such as glue or mucilage, having suspended 40
therein a quantity of chemicals unstable to the
increased temperatures produced by the blowing
of the fuse, such as potassium chlorate, potas
sium nitrate and lead dioxide, phosphorus, sul
phur and sesquisul?de of phosphorus.
45
Because the ribbon 5 is held suspended and
away from all contact with the fuse link 2, the
temperature of which varies with the load of
electrical current it carries, the coating upon both
sides of the ribbon will remain unchanged in- 50
de?nitely, unless the fuse is overloaded. When
the fuse becomes overloaded, the heat produced
by the fusion of the fuse link is su?icient to cause
the unstable chemical, such as potassium chlorate,
to break down. The adhesive material, being of 55
2
2,115,409
Doorly oxidizing character, is charred or car
window and said link comprising a narrow paper
bonized and obliterates the luminescent paint or ribbon having a discontinuous surface. at least
markings upon the visible surface of the ribbon. a part of the visible portion of said ribbon being
The darkening or blackening of the ribbon indi - in close proximity to ‘said link, a coating on at
cates that the fuse link has been ruptured, or, least a part of the visible portion of said ribbon
in the case of a fuse located in a dark place, the containing a carbonizable adhesive material and
failure of the ribbon to glow indicates that the an oxidizing salt, and a second coating on at
fuse link has been ruptured.
least a part of the visible portion of said ribbon
In Fig. 3, is shown a ribbon having notches I containing a luminescent sul?de.
‘
10 cut in its sides. These notches make the ribbon
4. In a fuse plug, a closed casing having a win
narrower in the middle, vand facilitate the car
bon particles reaching the top side of the ribbon.
In place of notches, it has been found equally
useful to punch a hole or a plurality of holes in
15 the ribbon, as illustrated in Fig. 4. The chemi
cals may be applied to the visible side of the indi
cator, as illustrated in Fig. 4. The indicator il
lustrated in Fig. 4 comprises a ribbon ll provided
with a plurality of holes or perforations ll.
20 Coating I2 contains a suspension of the chemi
cals unstable to heat in an adhering carbonizable
material and occupies one portion of the visible
10
dow therein, a fuse link in said casing, and an
indicator within said casing comprising a ribbon
of sheet material having a discontinuous surface,
at least a part of the visible portion of said rib
bon being in close proximity to said link, a coat 15
ing on the visible portion of said ribbon contain
ing a carbonizable-adherent material and an oxi
dizing salt, and a second coating over said ?rst
coating and containing a luminescent sul?de and
a radioactive salt._:_
20
5. In a fuse ' plug, a closed casing having a
window therein, a fuse link within said casing,
and an indicator within said casing comprising
portion of the ribbon l0. Coating l3 containing
the luminescent material occupies another por ' a ribbon having perforations in at least a part
tion of the visible portion of the ribbon III.
of its visible portion, said perforated part being
In Fig. 5 I have illustrated a ribbon l5 provided in close proximity to said link, a coating on the 25
with opposed notches l6. Coating l1 contains a visible portion of said ribbon containing a’ car
suspension of the chemicals unstable to heat bonizable adhesive material and an oxidizing salt
in ‘an adhering carbonizable material and occu
30 pies the visible portion of ribbon I0. Coating dispersed therein, and a second coating ovensaid
?rst coating and containing a luminescent sul 30
l8 containing the luminescent material is applied fide.
over the coating ll.
35
_
4
6. In a fuse plug, a closed casing having a win
The action of these indicators is similar to
the action of the previously described indicators.
dow therein, a fuse link within said casing, and_
Although Fig. 1 illustrates the indicator ribbon
in the preferred position in a common plug type
fuse construction, the ribbon may be disposed in
dow andv said link comprising a perforated rib»
bon, at least a part of the visible portion of said
ribbon being in close proximity to said link, a
different positons, such as below the fuse link,
in other types of transparent window fuse con
structions.
.
Having thus described my invention, what I
claim is:
1. In a fuse plug, an indicator comprising a
narrow ribbon of sheet material having a discon
45 tinuous surface, a coating on a part of the visible
portion of said ribbon, said coating being adapt
ed to carbonize at the temperature of the gas
produced by fusion of the fuse link, and a sec
ond coating on a part of the visible portion of
50 said ribbon and containing a luminescent mate
rial.
2. In a fuse plug, a closed casing having a win
dow therein, a fuse link within said casing, and
an indicator within said casing between said
55 window and said link comprising a narrow paper
ribbon, at least a part of the visible portion of
said ribbon being in close proximity to said link,
a coating on at least a part of the visible por
tion of said ribbon containing a carbonizable ad
60 hesive material and an oxidizing salt, and a
second coating on at least a part of the visible
portion of said ribbon containing a luminescent
sul?de.
3. In a fuse plug, a closed casing having a win
65 dow therein, a fuse link within said casing, and
an indicator within said casing between said
an indicator within said casing between said win
‘coating on the visible portion of said ribbon con
taining glue and potassium chlorate dispersed
therein, and a second coating over said first
coating and containing a luminescent sulfide and
a radioactive salt.
'7. In a fuse plug, a closed casing having a win
dow therein, a fuse link within said casing, and
an indicator within said casing comprising a
ribbon having opposed notches along its longi
tudinal edges in a visible portion of said ribbon,
said notched portion being in close proximity to
said link, a coating on the visible portion of said
ribbon containing a carbonizable adhesive mate 50
rial and an oxidizing salt dispersed therein, and
a second coating over said ?rst coating and con
taining a luminescent sul?de.
8. In a fuse plug, a closed casing having a win
dow therein, a fuse link within said casing, and 55
an indicator within said casing comprising a rib
bon having notches along its longitudinal edges
in a visible portion of its length, at least a part
of the visible portion of said ribbon being in
close proximity to said link, a coating on the 60
visible portion of said ribbon containing glue and
potassium chlorate dispersed therein, and a sec
ond coating over said ?rst coating and contain
ing a luminescent sul?de and a radioactive salt.
SVERRE QUISLING.
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