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t'tttoutetl Nova lid, liltlti
rarsur
‘cures
2&11360
ELE‘JTRIC FUSE
i
(A
This invention relates to electrical cartridge
type fuses. Such fuses in their usual applica
sealing relationship over the ends of the body
portion ill by the brass, copper, or other conduct~
tion are used to open a circuit when the current
lug metal ferrules l and ill respectively. Fer
?owing in the circuit exceeds a normal rating
rule construction of this lrind is well known in
for which the circuit is designed.
5 the electrical industry and need not be elab~
In the use of electrical equipment it is i'ound
orated, upon here with the exception that it is
that overloads occur, such as when several cur
necessary to include a sealing cement or other
rent consuming devices are simultaneously
material at the juncture of the tube and the
started, resulting in circuit current values which
conduction elements it and it which will pre
would be harmful if continued. Time is a factor, 10 vent moisture within the fuse body from leaking
however, and for relatively short periods of time
out. As an alternative construction the caps
such overload currents do not create any undue
“
I
construction, not shown,
heating in the circuit which would cause fau
‘715 ii and it‘ or
are
t or be detrimental to either the current
sl' gle elements rather than
two
or; lines of the circuits or to
equip
installed in the lines.
eleinent
is constructed of
is an object of this invention to provide a
fuse oi a construction which will permit over~
' an low
alloy of lead pointtin depending
such
upon
locals for short periods of time without destroye
be current capacity desired. This fusible ele~
ing the fusing element but which will open the
meat is a small hollow capillary tube, disposed
circuit readily upon continued overload.
centrally within the fuse body and closed oil at
It is a further object of this invention to pro~
its upper and lower junctions with the fuse caps
vide a fuse oi’ plug-type construction which will
ii and ill. in order to locate the fuse element
permit short duration over-loads without re“
with respect to the caps, punched indentations
sorting to moving parts such as dash pots and
i8 and it’ are provided in the upper and lower
springs.
caps providing a projection on the inner surface
A still further object of the invention is to
of the cap at which point the fuse element may
provide a fuse which is certain in its capacity to
be hired in place in electrical contact with the
function and which may be easily manufactured
caps Mend it sealing the ends oi’ the fuse ele
without any especially costly elements.
ment to. The length of fusible element may be
Other and ancillary objects of the invention
made slightly in excess of the distance between
may appear throughout the description, the de
. the inner surfaces of caps ii and i2 when as
tail drawing, and the appended claims.
sembled so that a tight fit is produced to hold it
In the drawing,
in place. Further insurance of retention of this
Figure l is a longitudinal cross section view 35 element in position may be had by slightly fus
through a fuse embodying our invention;
ing the ends to the caps by the application of
Figure 2 is a transverse section View taken on
controlled’ heat at the indentations lb and it’
the lines 2-2 in Figure 1; and
after ‘the caps El and
are positioned over the
Figure 3 is an elevation view partly
section,
ends of the fuse body it.
to show conditions within the fuse immediately
Two small holes ll and ll’ are provided in one
prior to the time when the fuse blows or melts.
in Figures 1 and 3 are shown the plug-type
idge fuse construction 1.,hich comprises an
latiug tubular body l
constructed of glass,
Wall of the fuse element, one of which is located
in the proximity of the lower fuse cap and the
other, in the proximity of the upper cap. A
small quantity of water
is introduced within
‘
e
'" ‘ e body to an elevation above the lower
fuse element with the fuse in a
_,
owing,
bottom
as is required for operation.
A
method of performing this operation
‘e to provide a small hole in the body of
the body
rlcal conducting metal of
he; temperature such
brass
the
or in one of the metal caps as at it
through
“3 the ‘water could be introduced,
which in K subsequently be sealed with a drop
or’ solder -aving a higher melting point than
any t
A erat
which would be experienced in
liquids may be substituted for
2,411,460
a
>
I
-
sulating tubular body portion," fuse caps secured
water; however, in the description which follows,
certain considerations are given which vare based
to the ends of the ‘body portion, and a hollow
on the use of water.
tubular fusible element in electrical association. .
‘
-‘
and sealed off at its ends with the fuse caps, said
There is a certain amount of capillary action - '
fusible . element
within the bore of the ‘fuse element 15. by the
tubular construction of the element itself,- which
having
openings
extending
throughitswall adjacent to its ends, and a sup
'
ply of liquid partly'?l'ling said body portion to, . .'
will carry water upwardly into the tube. This
' a. prescribed level with respect to the location of
, action may be increased and the functional ef
fects of the fuse varied by ?llingthe interior of .
one ofnsaid openings. .
I
'
3. In an electric fuse in combination, an in
this element It witha drying agent or such nia-v 10
-'terial as felt or glass wool. An excess of water , sulating. tubular body portion, fuse caps. secured
to the ends of the body portion, and a hollow tubu
over that shown in Figure 1 may be permitted
.-lar fusibleelement centrally located with respect j
in-the' fuse if it is desirable,'or conversely, this
quantity of water may be very slight by locating - to the body portion and in electrical associationv
and se'aledo? at its'ends with the fuse caps, said
the elevation of the small hole HI lower in the
fusible element , having openings extending
,‘fuse.’ During periods» of normal operating 'cur-.
through its wall adjacent to its ends, and a sup- .
' rent with the fuse placed in the. line, the ‘element
it by PR losses, audit will remain relatively
ply of liquid partly filling said body portion to a
prescribed level with respect to the location of '
cool. In case of an overload or short circuit, the 20
one of said openings.
temperature of the fuse element l5" will rise
_ 4. In ‘an electric‘ fuse in combination, an in
fuse element to the water within- theelement, .
~ the vapors will be driven o? through the‘upper ' I
ings extending through‘ its wall adjacent to its
‘ends, and a‘supply of liquid partly filling-said body.
.hole il' until thelevel oi’ the water drops below '
portion'to a prescribed level with respect to the
lvb'will receive no abnormal heat transferred to
‘
,
.
sulating: tubular body portion, fuse caps secured
rapidly. It will not reach melting temperature
ediately since the water within the tube will‘v _ to and ,in liquid tightrelationship with the ends
,of the body portlon, and a hollow tubularfusible
change vstate and bedriven off before‘ its fem-4
peratu're will greatly exceed 212° F. ' As steam
element in electrical association at itsends with -_
vapor is generated'b'y' transfer of heat from the. ' the vfuse caps, said fusible element. having open-1 .
the hole, and because of. the lower temperature
of the shell these vapors will condense and later
so
location of-one of said openings.
‘
-
-
5. In anjelectric ‘fuse in combination, an" in; '.
sulating tubular body portion, fuse caps secured‘ _- v.
tend to fall back into the lower portion of the ‘
fuse on the outside of the fuse element. Figure ' - to and in liquid tight relationship with the ends I" .
‘of the body portion, and a hollow tubular fusible
a shows acondition resulting when. all of the
liquid has been driven off from within the tube
to the level Just below the lower hole'il and has ’
collected in the form of minute dropletson'the'
inner surface of the body H0, at which time the
element in electrical-association and sealed off ‘
_-lng‘saidj body portion to'a prescribed level with ._
temperature '- of the fuse element may go beyond
respect to the location ofv one of said openings. '
‘212° F. and may then: reach the melting point
6. In ‘an. electric fuse. in combix'iation,v an in
of the fusible material, thus interrupting. the
'
electrical
circuit.
_
v
I
.
v
|
.' '
at its ‘ends with the fuse caps, said fusible element
having openings extending through its‘ wall adja- '
cent to it's ends, and‘a' supply of liquid partly illi
_ s'ulating tubular body-portion, fuse caps in liquid
.
' If the excess current-in‘ the-line should at thisv ‘ I tight relationship'with' the'ends of the body por- >~ " '
" time drop off and in case the fuse does not "blow,’-’
' then the droplets will, with normal agitation, re
turn to the lower portion of vthe body'and will -
again serve to prevent immediate ‘fusing on over
load.
,
'
-
"
"
tion, conducting‘metal' ferrules securing said fuse
caps to saidbody poition',.and- a hollow tubular : '
fusible element in electrical association at‘ its ends '
','with the fuse caps, said fusible element'havingv
’ openings extending-‘through its wall. adjacent to
its ends, and a supply of liquid partly ?lling said ,
*
In case the overload drops to a normal operat-_'
ing current prior to the time when the heat of
‘body portion .to a‘ prescribed level with respect to
the locationyoi one of said openings.
_
»
~ '7. In an electric fuse incomblnation, an in
vaporization had ‘driven off all the moisture from
within the ‘capillary tube, the moisture would then
be returned to the lower portion of the fuse/per‘ . sulating tubular bodyportiom-fuse caps-secured.
mitting continued service, without interruption. ' ' to and in liquid tight relationship with the’ ends
of the body ‘portion ‘and a hollowtubular fusible
element in electrical association‘ at its ends‘ with '.
Certain changesin relative size and in material"
may be made to permit operation atany'given
temperature. -
.
The invention is illustrated in a practical ‘but . I
'
simple form of apparatus which, however, may
be
the fuse caps,.said tubular fusible element having
openings extendingthro'ugh
its'wall
adjacent its
. ,
,
- ‘ends, and a‘supply» of liquid partly ?lling said
considerably modified so far as details of corn 60 body portion and carried upwardly into said‘tubu
lar fusible element by capillary attraction beyond
struction ‘are concerned, without departure from
its level within said body portion.
- ' the principles. of. the invention.
Patent
.'
is:
_
_
‘
_
-'
.
_
1. In an electric fuse in combination, an in-'
_
sulating tubular body portion, fuse caps secured
vclaim as new and desirev to secure by Letters
'
.
_8..In an- electric fuse in‘ combination, an in'-_
Having thus described our invention, what we '
65
to the ends of the body portion, ande'a hollow.
tubular fusible element in electrical association at -
its ends with the fuse caps, said tubular fusible
to the ends of the body portion,.and a hollow‘ - element ‘filled with' glass wool ‘and having-open- ~ I
ingse'xtending throughits wall adjacent its ends,
tubular, fusible element in electrical association
sulating'tubular body portion, fuse caps secured
at its ends with the fusecaps, said fusible element 70 anda supply of liquid partly fllllngsaid ‘body
portion and carried upwardly into said tubular
‘fusible element by a combined‘ action of the ele-.
ment surfaoe'and the glass wool surface above
-_ having openings extending through its wall adja-v
cent to ‘its ends, and a supply of liquid’ partly
?lling said body portion to a prescribed level with
respect to the location .of one of said openings.
2. In an electric ‘fuse in combination, an vin
_ the level of the liquid within said body portion.
_9. In an electric fuse in combination, an'in; .
'A
Y
e941 moo
sole-ting tubular body portion, fuse caps of rela
tively high melting temperature secured to the
oi the body portion, and a hollow tubular
fusible element of relatively low melting temper- _
ature in electrical association at its ends with the
fuse caps, said tubular fusible element having
openings extending through its wall adjacent its
ends, and a supply of liquid partly ?lling said
body portion to
prescribed level 314th respect
to the location of said openings.
l0
i=3. Tin an electric fuse in eoiioleination, an ine
sulating tubular body portion, rinse caps secured
6
to the ends of the body portion, and a hollow
tubular fusible element in electrical association
at its ends with the fuse caps, said tubular fusible
element having openings extending through its‘
wall adjacent its ends, and a supply of liquid
partly ?lling said body portion to a prescribed
level with respect to the location of said open
ings, said liquid having a boiling point which is
below the melting temperature of the fusible
element.
MELVILIE F. PETERS.
JOHN J. PHILLIPS.
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