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Патент USA US2126216

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Aug. 9', 1938. >
W. O. SCHULTZ ET AL
2,126,216
FUSE LINK EXPELLING MEANS
Filed March 10, 1937
2 Sheets-Sheet 1
6,769.]
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0.00.04
INVENTORS.
BY
ATTORNEY.
Aug. ‘9, 1938.
w. o. SCHULTZ ET AL
2,126,216
FUSE LINK EXPELLING MEANS v
2 Sheets-Sheet 2
Filed March 10, 193mg
30A
50
<<
37A
i
5
.
u,M
3
52..-
ATTORNEY.
Patented Aug. 9, 1938
2,126,216
UNITED STATES
PATENT, OFFICE ’
2,12$g%16
FUSE LINK EXPELLING DEANS .
William 0. Schultz, South Milwaukee, and Ches
ter W. Brown, Milwaukee, .Wls., minors to
Line Material Company, South Milwaukee, Wis,
a corporation of Delaware
'
Application March ill, 1937, Serial No. 130,054
13 t’llalms. it'll. 200-127)
‘This invention relates to improvements in i'use a fuse link ‘i disposed in the tube for electrically
link-expelling means for expulsion fuses.
connecting’ the upper‘ contact ferrule 2 and the
It is an object of this invention to provide for lower contact ferrule ii. The clamping arm 5 is
expulsion fuses, link-expelling means comprising provided with a clamping lug 8 which is slotted
5 a spring-actuated lever adapted to withdraw the at 9 in a vertical direction and longitudinally 5
fuse link from the tube in a path extending lou
relative to the cartridge l. The clamping lug
gitudinolly from the end thereof.
8 is also provided with a threaded recess ex»
Another object of this invention is to provide tending toward the base of the slot 9 and adapt
a spring-actuated lever for expelling a fuse limit ed to receive the threaded end of the clamping
m from a cartridge and adapted to clampinglv eu
gage the fuse link while the latter is under ten
sion and to release the fuse link after the link
has been. withdrawn from the cartridge.
A further object is to provide for standard
1;, expulsion fuses, fuse link-expelling means pro
loolt
hood Hills provided with a supporting arm it
having
in by means of the clamping bolt
detachable connection with the fuse, thereby ore=
venting old expulsion fuses from becoming oh
solete.
still further object is to provide a fuse link
to the interior of the shirt for supporting‘ the
lever as will hereinafter appear.
.
1 out devices.
the drawings:
slldahlv receiving the pin
and a clamping
low
cooperating with the clamping jawlél for
Fig. is a side elevation illustrating a preferred
form of this invention.
35
Fig. 2 is a fragmentary view in side elevation
of the device shown in Fig. 1 after it has oper=
securing‘ the
appear.
in side elevation
tl'us invention.
in side elevation
Fig. t after it o
operated.
4,5
so
‘
611s a view oi" the fuse link-commons mech
anism before it is removed from the tube and
taken from the left-hand side relative to Fig. 5.
Lille parts are identi?ed by the some refer»
ence characters throughout the several views.
~ In all of the expulsion fuses shown in the draw~
223 is pr -= 35
from the arcuate clamping surface on the clamp
lhgz
ill. The link-engaging arm is provided
with a reinforcing rib
on the lower side thereof.
The throvvout lever ltis biased to the'posl- [lo
-
is a fragmentary view
illustrating a modi?ed form of
Fig. 5 is a fragmentary view
illustrating the device shown in
link ‘i therein as will hereafter
As shown, the clamping
vlded with an arcuate clamping surface offset
Fig’. 8 is a lower end view of the device shown
in Fla. 1.
25
The tlru'owout lever 06 comprises a link-ten
siohiog
it provided with. a link?engaging
finger G8, a spring-engaging arm it provided
with sorlueureoeiving aperture ‘it, a plvotaena
gaging,’ arm. 2i extending’ to the interior of the W
l8 and provided with an elongated slot
to 3, inclusive, are suhstahtiahv iden:
tical with those shown in the copemddi'ig' applica
tion of William G. _E“>chuita,
Number
so ire-cost, ?led March. it, war, for Fuse liulz throw=
to
rthe sleet
hood it is also provided with a recessed apron
or
til extending below the arm it and with
a clamping law ill extending iii a horizontal di
" '“lou latertdlv from the lower margin of the 243
t. As shown, this jaw M is provided vdth an
, cuate clamping‘ lace upon its under side. The
shirt i3 is ‘provided with a pivot pin to extend-
expelling device in which the expelling lever is
movable radially on its pivot against the action
of its biasing spring, thereby to permit a fuse
limb; to be engaged. clampingly by the lC-EVEL' after
25 the level" has been moved to llnls-teuslonlug posttime.
vertically extending ‘portion (12 posi
tioned in the slot 9 and i’emcvably secured there- 15> .
‘ vlding the above-noted features and adapted for
2o
10
in the preferred form of the throwout device
illustrated in Figs. 1 to 3, inclusive, a hollow sleet
tioii shown in Fig. 2 by means of a coil spring
engaged at one end in the aperture ill of the
lever and at its other end ‘26 with the bottom'
of the hollow or recess Ell in the hood ill. Thus
the spring is extended into the hood and is pro- 45
tested against sleet formation which would tend.
to hamper the contractile action of the spring.'
'
The throwout lever it naturally assumes the
position shown in Fig. 2. When the fuse link 7!
is placed in the tube l as shown in Fig. 1, it will :50
logs, the fuse comprises a cartridge 6 having an . he passed beneath the ?nger l8 of the lever E6
upper contact ferrule 2, closure cap it, lower con— to hold the lever in the position shown and will
tact ferrule fl spaced from the lower open end of then be placed between the clamping jaws l4 and
the tube‘ and provided with a. depending clamp
23. In order to facilitate the placing of the fuse
ing arm 5, and a clamping screw or bolt 6 and link between the clamping jaws l4 and 23,.the 55
2
2,126,216‘
slot 22 in the arm 2i of the throwout lever I6
is provided. This slot 22 permits the throwout
lever iii to be moved, downwardly on the pin I5
relative to Fig. 2 for the purpose of separating
the clamping jaws I4 and 23. When these jaws
have been separated sufficiently, the link may
then be placed between them and upon release
of the lever I6, the spring 25 will clamp the
10
33A is provided with an aperture 38 adapted to
receive the lower portion of spring 29. The sides
34A of the lever are connected by a pivot pin 33
extending laterally from the sides and through
01
the slots 32 in the ?ngers 3I--3I.
The operative relation of the fuse leader 1 and
the throwout lever 34 is clearly shown in Fig. 4.
jaws to the link 1.
It will be observed that the spring-engaging
arm I9 on the lever I5 is extended in a hori
zontal direction to the right relative to Fig. 1.
The leader 1 extending from the bottom of the
fuse tube I is passed under the link-engaging
?nger 35, passed up through the opening 35A and 10
between the two pivot-supporting legs 3|, this
last passageway being enlarged by the downward
movement of the throwout lever in the radial slots
32, thus providing more clearance between the
resilient ?nger 36A and the contact face 31. The 15
tension spring 29 mounted between the two aper
tures 29A and 38 provides a clamping action on
the leader 1 between the contact surface 31 and
finger 36A and‘transmits a throwout action at
the link-engaging ?nger end on the leader 1.
After a predetermined overload has acted on
the fuse link, the throwout device throws the
leader 1 downwardly free from the tube while the
throwout lever describes an arcuate path down
ward and away from the end of the tube I.
When this action has taken place, the device is
a matter of choice when the link is mounted in in the position shown in Fig. 5. As the lever
34 moves away from. the tube end about the pivot
the cartridge.
Fig. 2 illustrates the portion ISA on the lever pin 33, the clamping action of the finger 35A
against the contact face 31 is destroyed, which 30
30 I6 in contact with the lower margin of the hood
l8, thereby serving as a stop de?ning the final permits the leader to drop from the structure,
position of the lever after the link 1 has been thereby providing a clear indication that the
circuit through the fuse has been opened.
withdrawn from the cartridge.
The device shown in Figs. 4 to 6, inclusive, is
The device illustrated in Figs. 1 to 3, inclusive,
modi?ed from that shown in Figs. 1. to 3, in
' operates as follows: Assuming that the fuse link
1 has been tensioned as illustrated in Fig. 1, and clusive, in that the radial slot 32 is placed on the
that an overload has destroyed the upper end of supporting ?ngers 3i of the supporting arm 28,
the fuse link (not shown), the spring 25 will while the radial slot 22 in Figs. 1 to 3, inclusive,
cause the lever to rotate about the pin I5 and is placed in the pivot-engaging arm 2i of the
throwout lever l5. Another difference is noted 40
4 O thereby move the fuse link in a path extending
downwardly and arcuately from the lower end in the exposure of the tension spring 28 in
of the tube I. When the lever I3 has moved a Figs. 4 and 5 and the attachment of the upper
This extended portion ISA serves as a means for
manually moving the lever I6 to separate the
jaws I4 and 23. It will be further observed that
the link-engaging ?nger I8 on the lever I6 is
directly beneath the cartridge I. Consequent
hr, when .the jaws I4 and 23 are separated by
pressing down on the portion ISA, the finger I8
will contact the end, of the cartridge and serve
as a pivot point while the link 1 is being inserted
between the jaws.
Although the ?nger I8 is not shown in contact
with the lower end of the cartridge, nevertheless,
it will be obvious that its position relative to the
cartridge when in link-stressing position, will be
given distance in the path indicated, the jaws
l4 and 23 will be separated sufficiently to permit
the link to drop from the structure, thereby
clearly indicating that the circuit through the
fuse has been opened.
A modified form of the invention disclosed
herein is shown in Figs. 4 to 6, inclusive. Fig. 4
discloses the device in operative position rela
tive to the tube I, the clamping bolt 6 and the
fuse leader-'1. The supporting arm 28 is bent to
provide a vertical section 38 and upper and lower
angularly extending portions 30A and 383, the
upper end of the upper portion 30A being pro
vided with an aperture 23A adapted to receive the
upper end of the spring 29 and the lower end of
the lower portion 303 being formed into two
60
spaced supporting ?ngers 3I-3I,‘ each ?nger
being provided with vertically extending elon
gated slots 32 as shown in Fig. 4. A pivot pin 33
extends between the ?ngers 3I-3I and is slid
able in the elongated slot 32.
. A throwout lever 34 is pivotally mounted on pin
33 and is provided with a link-engaging finger
38 adapted to‘ receive the leader 1 and hold it in
alignment with the throwout lever 34., Formed
as an integral part of the throwout lever, is a
resilient finger 38A extending in an arched path
above the broad section 31A of the throwout lever
34. The throwout lever or channel member 34
has tapered sides 34A, one of which is cut away
to provide a slot 35A. The bottom of the channel
member 38 is slotted at 33 to provide a clamping
75 ?nger 38A and a bridge 33A. The bridge section
end of the spring with the upper portion of the
supporting arm 28 different from the encased
‘spring 25 shown in Figs. 1 and 2 and the attach
ment of its upper end with the hood III.
From the foregoing it will be apparent that a
fuse link throwout device for expulsion fuses has
been provided which pulls the link in an axial
direction relative to and exteriorly of the tube,
thereby producing a minimum ?exing of the link
as it leaves the tube.
It will also be seen that
the throwout device provides a positive release of
the link after the latter is removed from the tube
and thereby permits the link to drop from the
fuse structure.
Furthermore, the means for re
leasing the link provides a simple, movable clamp
for the protruding end of the link, enabling easy
assembly of the link in operative position.
Obviously, the throwout device herein disclosed 60
can be cheaply manufactured and provides suit
able protection of the movable parts from sleet
and damage.
~
In addition to the principal objects of the in
vention heretofore disclosed, it will be apparent
that we have provided a throwout device in which
the lever biasing spring 25 (Figs. 1 and 2) and 23
(Figs. 4 and 5), as well as the throwout lever 18
(Figs. 1 and 2) and 34 (Figs. 4 and 5) are not
subjected to destructive full line currents because
fuse links tensioned thereby are held in direct
electrical connection with the pivot support.
We‘ have also provided a throwout device in
which the throwout lever assumes a predeter
mined position after it has withdrawn a fuse link 76
2,126,216
3
and in which the clamping action of the ‘throw
other end with said lever-actuating arm, said
out lever is not dependent upon the thickness of _ lever and support having cooperating clamping
the material or the kind of material of the lever.
That is, the lever may be made very sturdy and
need not be made of metal, although such may
be preferred.
'
Another feature which will be apparent from
the foregoing disclosure is in the novel arrange
ment of the lever supporting pivot means where
10 by the projecting ends of the fuse links may be
positioned between the clamping jaws regardless
of the transverse dimension of the link and with
out ' changing the point‘of application of the
throwout lever.
We claim:
.
portions for securing a fuse link thereto when
said link-engaging arm is engaged with said fuse
link.
1
5. A fuse link throwout device for expulsion
fuses, said device comprising a support adapted
6
for attachment to a fuse cartridge, a throwout
lever pivotally mounted intermediate its ends on
said support to provide a fuse link-engaging arm 10
on one side of, the pivot and a lever-actuating
arm on the other side of said pivot, and a spring
engaged at one end with said support and at
the other end with said lever-actuating arm, said
lever and support having cooperating clamping
.
1. A fuse link throwout device for expulsion
fuses, said device comprising a supporting mem
ber having a link-clamping pbrtion, a throwout
lever pivotally mounted on the support for ten
sioning said link and having a link-clamping
portions for securing a fuse link thereto when
said link-engaging arm is engaged with said fuse
link, the pivotal mounting of said lever being
movable in a direction laterally of the pivot axis
to facilitate clamping engagement of said fuse' 20
portion cooperatively related to said clamping‘ link.
portion on said support, and a spring secured at
6. A fuse link throwout device for expulsion
one end to said support and at the other end fuses, said device comprising a support adapted
to said lever, said clamping portions being» upon for attachment to a fuse cartridge, a throwout
a side of the pivotal mounting of said lever op
lever pivotally mounted intermediate its ends
posite to that on which said spring is secured to
said lever, whereby said spring holds said clamp
ing portions operative while said lever tensions
said link and moves said lever from clamping
30 position after said fuse link is severed. \
2. The combination with an expulsion tube
and a fuse link extending therefrom, of a fuse
link throwout device supported by said tube and
comprising a support secured to the tube and
having a link-clamping portion, a throwout lever
pivotally mounted on the support and having a
clamping portion operatively related to said
clamping portion on said support, and a spring
having one end engaged with the support and
40 the other end engaged with said lever, said
clamping portions being upon a side of the piv
otal mounting of said lever opposite to that on
which said spring is secured to said lever, said
lever being engaged with said fuse link to pull
said link from said tube and clamping the ex
tending portion of said link to said support, said
spring holding said clamping portions operative
while said lever tensions said link and biasing
said lever to pull said link from said tube and
cause separation of said clamping portions when
said fuse link is severed, whereby to release said
fuse link from clamping position between said
lever and said support.
3. The combination with. an expulsion tube
and a fuse link extending therefrom, of a fuse
link-expelling
device
comprising - a
support
on said support to provide a fuse link-engaging
arm and a lever-actuating arm, a spring con
nected at one‘ end with said support and at the
other end with said lever-actuating arm, and
means for clampingly engaging a fuse link when 30
said link-engaging arm is engaged therewith, said
means beingupon a side of the pivotal mounting '
of said lever opposite to that on which said lever
actuating arm is positioned.
7. A fuse link throwout device for expulsion
fuses, said device comprising a support adapted
for attachment to a fuse cartridge, a throwout
lever pivotally mounted intermediate its ends on
said support to provide a fuse link-engaging arm
and a lever-actuating arm, a spring connected 40
at one end with said support and at the other
end ‘with said lever-actuating arm, and means
for clampingly engaging a fuse link when said
link-engaging arm is engaged therewith, said
means being upon a side of the pivotal mounting
of said lever opposite to that on which said lever
actuating arm is positioned, the pivotal mount
ingof said lever being movable in a direction
laterally of the pivot axis.
8. In combination with a fuse cartridge having '
an open end and a fuse link projecting there
from, a fuse link throwout device comprising a
support secured to said cartridge, a throwout
lever pivotally mounted intermediate its ends on
said support to provide a link-engaging arm to
engage with said link and a lever-engaging arm,
a spring secured at one end to said‘ support and
mounted on said tube, a throwout lever pivotally
mounted on said support, the pivotal mounting
at the other end to said lever-engaging arm and
of said lever being movable in a radial direction
biasing said lever to pull said link from said tube,
60 relative to the pivot axis, a spring coacting be
\said link-engaging arm being movable in an are 60
tween said support and throwout lever, said lever extending tangentially from the open end of said
engaging said fuse link and being biased by said _ tube, thereby to pull said link from said ‘tube
spring to pull said fuse link from said tube, said
lever clampingly engaging said fuse link to said
with a minimum ?exing thereof, and means for
clamping the projecting portion of said link to
support and being biased'to clamping position
said support.
by said spring while said lever is engaged with
said link.
.
'
_
4. A fuse link throwout device for expulsion
‘
9. In combination with a fuse cartridge hav
ing an open end and a fuse link projeéting
therefrom, a fuse link throwout device corn--v
fuses, said device comprising a support adapted - prising a support secured to said cartridge, a
70 for attachment to a fuse cartridge, a throwout throwout lever pivotally mounted intermediate
75
lever pivotally mounted intermediate its ends on
said support to provide a fuse link-engaging arm
on one side of the pivot and a lever-actuating
arm on the other side of said pivot, and a spring
engaged at one end‘with said support and at the
its ends on said support to provide a link-en—
gaging arm to engage with said link and a
lever-engaging arm, a spring secured at one
end to said support and at the other end to
said lever-engaging arm and biasing said lever 75
2,126,216
4
12. In combination with a fuse cartridge hav
ing an open end and a fuse link projecting
therefrom, a fuse link throwout device com
prising a support secured to said cartridge, a
to pull said link from said tube, said link-en
gaging arm being movable in an are extending
tangentially from the open end of said tube,
thereby to pull said link from said'tube with
throwout lever pivotally mounted intermediate
a minimum flexing thereof, and means for
its ends on said support to provide a link-engag
ing arm to engage with said link and a lever
engaging arm, and a spring secured at one end
to said support and at the other end to said
lever-engaging arm and biasing said lever to
pull said link from said time, said link-engaging
clamping the projecting portion of said link to
said support, the pivotal mounting of said lever
being movable in a direction laterally of the
pivot axis, thereby to facilitate clamping of said
10
link.
'
10. In combination with a fuse cartridge hav
ing an open end and a fuse link projecting
therefrom, a fuse link throwout device com
arm being movable in an are extending tangen
prising a support secured to said cartridge, a
throwout lever pivotally mounted intermediate
its ends on said support to provide a link-en
gaging arm to engage .with said link and a
lever-engaging arm, and a spring secured at one
tially from the open end of said tube, thereby
to pull said link from said tube with a minimum
?exing thereof, said support and lever having
cooperating clamping portions for clamping the
projecting end of said link therebetween, the
pivotal mounting of said lever'being movable
end to said support and at the other end to
20 said lever-engaging arm and biasing said lever
to pull said link from said tube, said link-en
in a direction laterally of the pivot axis and
gaging arm being movable in an are extending
said clamping portion automatically releasing
tangentially from the open end of said tube,
thereby to pull said link from said tube with
a minimum ?exing thereof, said support and
lever having cooperating clamping portions for
clamping the projecting end of said link there
between.
-
11. In combination with a fuse cartridge hav
30 ing an open end and a fuse link projecting
therefrom, a fuse link throwout device com
prising a support secured to said cartridge, a
throwout lever pivotally mounted intermediate
its ends on said support to provide a link-en
35 gaging arm to engage with said link and a
lever-engaging arm, and a spring secured at one
end to said support and at the other end to
said lever-engaging arm and biasing said lever
to pull said link from said tube, said link-en
40 gaging arm being movable in an are extending
tangentially from the open end of said tube,
thereby to pull said link from said tube with
a minimum ?exing thereof, said support and
lever having cooperating clamping portions for
clamping the projecting end of said link there-‘
between, the pivotal mounting of said lever
being movable in a direction laterally of the
pivot axis and biased against said movement by
said spring, thereby to facilitate clamping of
50 said link and to thereafter hold said link in
clamped position.
’
biased against said movement by said spring, -
thereby to facilitate clamping of said link and
to thereafter hold said link in clamped position,
said link when the latter is pulled from said
cartridge.
13. The combination with a fuse cartridge
having an open end and a fuse link projecting
therefrom, of a throwout device comprising a
supporting arm secured to said cartridge, a
throwout lever pivotally mounted on said arm "
and having a link-tensioning position, the piv
otal connection between said arm and lever being
disposed in a plane normal to and adjacent the
end of said cartridge, said lever being slidable
on said pivot in a direction paralleling said :1.
cartridge, a clamping jaw on said arm and a
cooperating clamping jaw on said lever andv
beneath the other jaw, said jaws being substan
tially normal to the sliding path of said lever
and relatively below said pivot, said jaws clamp
ingly engaging said fuse link and extending lat
erally relative to said arm and lever, said lever
engaging and tensioning said fuse link adjacent
said open end, and a spring coacting between
said arm and lever to hold said jaws in clamping
relation and urging said lever to pull said link
from said tube.
,
-
WILLIAM O. SCHULTZ.
CIESTER W. BROWN.
50
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