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Патент USA US2124813

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July 26, 1938.
.J. CORSER
FUSE PLUG
Original Filed March 5, 1936
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Patented July 26, 1938
2,124,813
UNITED STATES PATENT OFFICE
2,124,813
FUSE PLUG
John Corser, Minneapolis, Minn.
Application March 5, 1936, Serial No. 67,392
Renewed July 30, 1937
20 Claims. (Cl. 20G-_2130)
This invention relates to fuse plugs of that
The plug is adapted to be inserted irrto a fuse
type adapted to be screwed into sockets. Such receptacle or socket in the usual way. When the
plugs usually have been provided with fuses lo
fuse is burned out it releases the tongue 6. There
cated back of mica disks. They have been objec
fore, when the plug is removed for inspection the
5 tionable because the mica has added to the released tongue will spring out of the groove 3
cost; because it is diiiîcult to see the fuses as shown by broken lines in Figure 3 and indicate
through the mica; and because the plugs can be to the user that the fuse is useless. It will also
reinserted, when burned out, with coins or other act as a baille to prevent the plug from being rein
metallic objects inserted to bridge the fuse.
serted into the receptacle for the purpose of hold
ID
An object of the present invention is to elim
ing a coin or the like in position.
inate the mica and to provide a means whereby,
In Figures 4 and 5 the plug Ii) has been shown
when the fuse is burned out, it will not fit the with its threaded sleeve II slotted at I2 to pro
socket, thus positively indicating to the user that vide a tongue I3 extending along a longitudinal
the fuse is useless and a new plug must be used.
groove I4 in the plug. This tongue is also held
Nv
With the foregoing and other objects in view normally under restraint by a fuse l5 joined to a
which will appear as the description proceeds, the conductor I6 in the plug and leading from con
invention consists of certain novel details of con
tact I‘I.
struction and combinations of parts hereinafter
In this modified structure the operation is the
n
incre fully described and pointed out in the
¿'0 claims, it being understood that changes may be
made in the construction and arrangement of
parts without departing from the spirit of lthe in
vention as claimed.
Q_
In the accompanying drawing the preferred
forms of the invention have been shown.
In said drawing:
Figure l is a central section taken longitudi
nally through the plug.
Figure 2 is a side elevation.
Figure 3 is a section on line 3-3, Figure l.
Figure 4 is a view similar to Figure l showing
a modiñed construction.
Figure 5 is a side elevation thereof.
Figure 6 is a section through another form.
Referring to the figures by characters of ref
erence, I designates a plug of porcelain or other
suitable insulating material having a radial slot
2 extending thereinto from one end and inter
40 sected at its outer side by a groove 3 extending
partly around the plug.
A sleeve 4 of conductive material is ñtted on the
plug and is screw-threaded so as to engage prop
erly in the usual socket. This sleeve is slotted
45 at 5 to form a tongue 6 extending longitudinally
of groove 3 and interrupting the thread on the
sleeve. As the sleeve is oi resilient material the
tongue is likewise resilient.
A contact ‘I is located at the center of one end
oi the plug I and is formed on one end of an an
choring strip ß which is also a conductor. This
strip is ñtted in the plug I at the inner end of
slot 2 and is joined to the tongue 6 by the fuse 9.
Thus the tongue is held normally retracted back
55 in groove 3 as shown.
same as that heretofore described.
When the
fuse is burned it releases the tongue I3 which is
thus free to spring outwardly as shown by broken
lines in Figure 4, thus to form a baffle.
In Figure 6 the plug I 8 has a diametrical open
ing I9 and a radial recess 2D both opening into a
longitudinal groove 2 I. The threaded sleeve 22 on
the plug has an opening 23 alined with recess 20
and is also formed with an inwardly extended ear
24 overhanging the opening. This ear supports a
tongue 25 which laps a ñange 26 on a plunger 2l.
The plunger is seated in recess 2U and a spring 28 n
is also located in said recess:
A Contact 29 is located at one end of the plug
and is held in place by a combined conductor and
anchoring strip 30 seated in the plug. A fuse
3| connects this strip to the tongue 25 and the
tongue, in turn, holds the plunger normally
pressed back into recess 2U so as to maintain the
spring under compression.
When the fuse is burned it releases tongue 25 ,f
and the plunger 2'I thus is free to be projected by
its spring so as to extend outwardly beyond the
threaded sleeve 22 to form a baiiie as soon as the
plug is removed from its receptacle or socket.
Thus reinsertion of the plug into the receptacle ~
is prevented.
What is claimed is:
l. A plug, a fuse, and means released by the
fuse when burned for preventing insertion of _
the plug into a receptacle.
2. A fuse plug for insertion into a fuse recep
tacle before the fuse is burned and removable
from the receptacle before or after the fuse is
burned, said fuse plug comprising a plug, a
baille movable laterally to position beyond the
0
2
2,124,813
plug, and a fuse for holding the baille normally
retracted into the plug.
'
3. A plug, a sleeve thereon, a contact, a baille
movably mounted relative to the sleeve, and a
fuse connection between the contact and baille
for holding the baille normally retracted into the
sleeve and plug.
4. A plug, a sleeve thereon, a baille carried by
the sleeve and mounted to spring outwardly rel
ative thereto when unrestrained, and a fuse for
holding the baille against movement.
and
normally
non-current-carrying
therein and non-current carrying means con
trolled by the fuse for preventing insertion of the
fuse into a receptacle after burning of the fuse.
15. A plug fuse adapted for insertion into a
fuse receptacle and including a plug body, a fuse
wardly relative thereto when unrestrained, and
and means biased to extend beyond the periphery
a fuse for holding the baille under restraint.
6. A plug, a threaded sleeve thereon, a resil
ient baille carried by the sleeve and extending
of the plug body adapted to prevent insertion
of the plug into a plug receptacle and normally
held by the fuse within the periphery of the plug
partly therearound, said baille being mounted to
body.
spring outwardly relative to the sleeve when un
restrained, and a fuse in the plug for holding the
fuse receptacle and including a fuse and means ,
20 baille under restraint.
`
Y
7. A plug, a threaded sleeve thereon, a resilient
baille carried by the sleeve and interrupting the
thread, said baille being mounted to spring out
wardly relative to the sleeve when unrestrained,
25 and a fuse in the plug for holding the baille
under restraint.
8. A plug, an apertured sleeve thereon, a
spring actuated plunger in the plug, and fuse
restrained means for holding the plunger nor
mally retracted in the plug, said plunger when
released being movable into the aperture and out
wardly from the sleeve.
9. A plug, a fuse therein, and means con
i trolled by the fuse for preventing insertion of
the plug into a receptacle when said fuse has
burned.
`
10. A plug, a fuse therein, and spring means
released by the fuse when burned for thereafter
preventing insertion of the plug into a receptacle.
11. A plug, a fuse therein and spring con
40
trolled means released by the fuse when burned
for preventing insertion of the plug into a re
ceptacle.
12. A plug fuse adapted for insertion in a
45 fuse receptacle and including a fuse and non
current carrying means normally retracted into
the plug and adapted to be released by the fuse
when burned for preventing insertion of the plug
into a receptacle.
50
therein
means controlled by the fuse for preventing in
sertion of the fuse into a receptacle after burn
ing of the fuse.
14. A plug fuse adapted to be inserted in a
fuse receptacle and including a plug body, a fuse
carried by the sleeve and mounted to spring out
5. A plug, a sleeve thereon, a resilient baille
30
13. A plug fuse adapted to be inserted in a fuse
Vreceptacle and including a plug body, a fuse
16. A plug fuse adapted for insertion into a
controlled by movement of at least a part of said
fuse when burned for thereafter preventing in
sertion of the plug into a receptacle.
17. A plug fuse adapted for insertion into a
receptacle and comprising a plug body, a fuse ._
supported thereby and fuse-controlled normally
ineilective means adapted to prevent insertion of
a plug fuse into a receptacle, said means being
rendered effective on burning of the fuse.
18. A circuit protector comprising a plug body,
a circuit opening means therein having a por
tion thereof adapted to be moved during circuit
opening operation thereof and a baille biased to
have a portion thereof project beyond the exter
nal periphery of the plug body to prevent in 35
sertion of the protector Vinto a receptacle and
normally restrained within the periphery of the
plug body by the circuit opening means.
19. A plug fuse adapted for insertion into
a receptacle and comprising a plug body, a fuse
therein and normally-ineffective means for pre
venting insertion of a plug fuse into a receptacle
said means becoming effective on removal of a
burned out plug fuse from a receptacle.
20. A plug fuse as set forth in claim 10 in which
said spring means comprises a part of the cur
rent-traversed elements of the plug fuse.
JOHN CORSER.
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