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Патент USA US2113632

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April 12, 1938.
A. G. STEINMAYER
‘2,113,632
FUSE CONSTRUCTION
Filed Dec. 4, 1935
'
INVENTOR.
5/4”” 9 jfazkz/r/aya?
BY
5% ?ZCJ
I QRNEY.
Patented Apr. 12, 1938-
I
-
,
2,113,632
UNITED ‘STATES PATENT OFFICE
2,113,632
FUSE CONSTRUCTION
Alwin G. Steinmayer, Milwaukee, Wis., assignor
to Line Material Company, South Milwaukee,
Wis., a corporation of Delaware
Application December 4, 1935, Serial No. 52,792
.16 Claims. (01. 200-417)
This invention relates to a fuse construction.
Objects of this invention are to provide a very
simple type of fuse construction which may be
used in any capacity but is eminently suitable for
use as a secondary fuse.
It is well known that where very small amperage
primary link fuses are used when fusing a transformer for instance, that it is usually the practice
to use nothing smaller than a 3-ampere fuse for
10 example, with the result that there is often over
fusing of the smaller transformers, particularly
of the 13,000 volt class, and secondary fuses are
jacent terminal member, thereby increasing the
Separation and additionally giving a Visible in
dication that the fuse has blown, the construction
being such that only one contact is required for
the fuse tube, the free or open end of the fuse 5
tube being without a contact member.
>
Further objects are to provide a construction
in which a relatively heavy spring pressure may
be applied to assist in maintaining contact be
tween the fuse and a contact carried by the fuse 10
tube and also acting in a capacity to move the fuse
tube or fuse assembly from Operative to inop
therefore necessary for overload protection.
erative position, preferably assisting the action of
Additionally, it is advisable 'to use secondary
fuses where there are grouped secondaries of the
transformers to prevent “outage” cf the entire
group in case of failure of a single transformer.
This invention is designed to provide a. 5115pension type fuse which does not require any
gravity, the Contact Pressure being relatively high
and the spring itself, in addition to the terminal 15
member, furnishing a conducting path from one
end of the fuse link to the adjacent terminal
member, the construction being such, however,
that although a relatively high contact pressure
room on the cross arm of a pole, for example,
is provided, nevertheless a relatively small strain 20
2 O but instead may be employed directly in the sec-
ondary line, thus minimizing the space require-
ment, and which may be placed in any position,
is imposed on the fuse link. The construction is
such that although a short fuse tube may be em
ployed if desired, the leakage path is great after
either horizontally, vertically or in 'an angular
25 position.
In general, this invention is an improvement
over that disclosed in‘ the copending application of
Ramesis Alfonso Hammack for a Fuse construction, ?ledNovember 8, 1935, Serial No. 48,837.
30
In some previous constructions of suspension
fuses it has been the practice to provide a separate insulating block which acts as a mounting
member for the fuse link.
This invention, however, has for its further
35 object the provision of a suspension fuse in
which the strain member also serves as a spacing
member for the fuse link, and in which the suspension member, which may be of a. porcelain
body portion, for example, is so joined to the line
the fuse has dropped open so that the chance of
arcing over even with a very short tube is very 25
much lessened.
7
An embodiment of the invention is shown in the
accompanying drawing, in which:
>
Figure 1 is a side elevation of the drop-out sus
pension fuse as it appears when in position, parts 30
being broken away and in section, the fuse tube
being shown in dotted lines as it appears after the
fuse has blown.
Figure 2 is a fragmentary sectional view
through the fuse tube taken on the line 2—2 of 35
Figure 1, with parts broken away and in section.
Figure 3 is a sectional view through the insula
tor, the line wires being omitted, such view cor
responding to a Section 011 the line 3—3 01'
40 wires that the porcelain is placed under compression, and in which no strains due to the pull of
the line wires are imposed upon the fuse link or
Figure 1.
>
40
Referring to the drawing, it will be seen that
>
an insulator l preferably of porcelain has been
fuse member, such member being held spaced with
provided and has transversely extending aper
relation to the line wires and being so held that
45 it may be readily renewed.
Further objects are to provide a suspension fuse
construction of the drop-out type in which a fuse
assembly, which may include a fuse tube and a
tures 2 and 3 therethrough for the reception of
the line wires 4 and 5. These line wires lie in 45
diametrically opposed grooves arranged in pairs
and formed in the insulator I and indicated by
the reference characters 6 and ‘I, the pair of
fuse link for instance, is movably, preferably
50 pivotally supported from the- porcelain member
‘preferably being carried by one of the terminal
members, in which the free end of the fuse tube
is held in place by the fuse link and is released
when the fuse link is ruptured, allowing the free
mi end of the fuse tube to move away from the ad-
grooves 5 aligning with the aperture 2 and the
pair of grooves l aligning with the aperture 3.
50
The line wires are interlooped, as is apparent
from Figure 1, that is to say, the line wire 4 lies
within the groove 1 and passes through the aper
ture 3, and the line Wire 5 lies Within the groove
6 and passes through the aperture 2 so that they 55
2
2,118,632
are interlinked and thus place the porcelain or
other insulating member I under compression.
Terminal members 8 and 9 are secured to the
main insulator or body portion I in any suitable
manner, as by means of the screws in cemented
in place at the end faces of the body portion i,
preferably lock washers and nuts being provided
to lock the terminal members 8 and 9 rigidly
to the end faces of the body portion l.
The terminal member 8 is provided with ‘a
10
screw Ii and nut l2 for locking the bared end of
the conductor 4 to the terminal member 8, a suit
able washer“ being employed as indicated.
The terminal member 8 continues downwardly
15 and is provided with an offset looped portion or
bearing portion i3 and continues outwardly in
a horizontal portion [4 with an upstanding ?nger
or end l5 for a purpose which will hereinafter
appear. A relatively heavy leaf spring I5 is
20 clamped between the body portion l and- the ter
minal member 8 and projects-downwardly, as
shown in Figure 1.
'
A fuse tube assembly, consisting of a fuse tube
i'I formed of insulating material and provided
25 with an open outer end slightly internally round
ed, as indicated at I8, is provided with a contact
or head ii! at its pivoted end. This contact i9
is in reality a. cap with an aperture therethrough
and is screwed or otherwise secured 'to the fuse
tube IT. The contact member [9 is provided with
downwardly extending spaced arms 20 which
carry a pivot pin 2| loosely ?tting within the
looped portion or hinge portion l3 of the terminal
member 8, as shown clearly in Figures 1 and 2.
The fuse tube assembly also includes a fuse
link which may be of any construction. For ex
' ample-it may be provided with a ?exible leader
22 and with a button head 23 and an. interme
40
diate, fusible preferably reduced portion 24.
This fuse link is passed through the contact
l9 and the button head bears either directly
against the contact or against a washer 25, if so
desired.
The free end of the relatively heavy spring 18
bears directly against the button head 23 of the
fuse link and affords a relatively high contact
pressure to insure good electrical contact, and
the spring, therefore, as well as the terminal
member 8, affords a. direct current path to the
line line conductor 4.
The terminal member 9 carries a screw 26 and
a nut 21 which locks the‘bared end of the line
wire or conductor 5 to the terminal member 9, a
washer being preferably employed as indicated.
55 The screw 26 may be longer than the screw II,
as shown in Figure 1, and carries a thumb nut 28
which releasably receives the free end of the fuse
link, as shown, so as to permit ready re~fusing
after‘ the fuse has blown.
.
It is to be noted that due to the peculiar lever
60
age effect, the contact pressure from the spring
16 may be high, but nevertheless the actual pull
on the fuse link is relatively small.
'
When the fuse blows, the ruptured link releases
65 the fuse tube assembly and the fuse tube rocks
into the dotted line position under the in?uence
of gravity, but primarily under the in?uence of
the relatively heavy spring I 8. This spring in
sures a positive motion of the fuse tube from
70
operative to inoperative position.
Additionally, the discharge of the heated gases
and volatilized metal is/away from the body por
tion and there is no chance of carbonizing or of
the forming of a metal coating from condensed‘
metal vapors ‘on the porcelain body portion I.
The extension I! of the terminal member 8,
together with the upturned arm I5, preclude the
dropping of the fuse tube downwardly after the
fuse has blown. However, the device may be
readily re-fused as it isme'rely necessary to slide 10V
the hinge pin 2| outwardly and unhook it from
the upturned portion. ii of this hinge support of
the terminal member 8. A new fuse may be read
ily inserted and the free end thereof may be‘
clamped beneath the thumb nut 28 after the fuse 15
tube assembly has been rocked back into place.
It is apparent that in re-fusing, the unscrewing
, of the thumb nut 28 will not loosen the attach
ment of the corresponding line wire. Also it is
apparent that this device may be most easily re 20
fused and put back into service.
It is to be noted further that the invention
provides a porcelain or other insulating body por
tion which is preferably held in compression and
carries a drop-out fuse structure.
25
It is also apparent that these suspension fuses
may be placed horizontally, vertically or at any
angle desired, and that although the fuse tube
assembly is preferably placed directly below the
body portion, it nevertheless may be placed in 30
another position than that shown in Figure 1.
These suspension fuses require no mounting or
space on the cross arm of a pole, for instance,
but are held directly by the line wires, conse
quently minimizing the space requirement.
35
Although the invention has been described in
considerable detail, it is to be understood that the
description is intended as illustrative rather than
limiting, as the invention nfay be variously em
bodied and is to be interpreted as claimed. '
I claim:
1. A suspension fuse construction comprising
a body portion formed of insulating material and
40
having spaced apertures for the reception of
looped conductors with the loop of one conductor 45
interlinking the loop of the other conductor, ter
minal members carried by said body portion and
electrically connected to said conductors, and a
drop-out fuse assembly normally electrically con
necting said conductors, said drop-out fuse as 50
sembly including an insulating tube enclosing a
fuse link and located below said body portion. '
2. A suspension fuse construction comprising a
body portion formed of insulating material and
having spaced apertures for the reception of 55
looped conductors with the loop of one conductor
interlinking the loop of the other conductor, ter
minal members carried by said body portion and
electrically connected to said conductors, a drop
out fuse assembly normally electrically connect 60
lng said conductors, and a spring biasing said
fuse assembly towards drop-out movement.
3. A fuse construction comprising a body por
tion formed of insulating material and having
means for the reception of conductors, terminal 65
members carried by said body portion and electri
cally connected to said conductors, and a drop
out fuse assembly including an insulating mov
able portion and a fuse link carried by said mov
able portion and normally electrically connecting 70
The free end of the fuse tube moves to a point said terminal members, said fuse link restraining
widely spaced from the terminal member 9 and
thus provides a wide spacing of the parts, or, in
other words, -a long leakage path, greatly lessen
75 ing the chance of arcing or of any slow leak
said movable portion from drop-out movement
and releasing said movable portion when said fuse
link is ruptured, said movable portion having a
contact at only one end.
75
2,113,632
4. A fuse construction comprising a body por
tion formed of insulating material and having
means for the reception of conductors, terminal
members carried by said body portion and elec
trically connected to said conductors, a drop-out
fuse assembly including an insulating movable
portion and a fuselink carried by said movable
portion and normally electrically connecting said
terminal members, said fuse link restraining said
10 movable portion from drop-out movement and
releasing said movable portion when said fuse
fu'se link is ruptured, said movable portion hav
ing a contact at only one end, and a spring bind
ing against said fuse link and electrically con
nected to one of said terminal members, said
spring biasing said fuse assembly towards drop
out movement.
I
5. A fuse structure comprising an insulating
body portion, a ?rst and a second terminal mem
ber carried by said body portion and projecting
therefrom, means carried by said terminal mem
bers for receiving conductors, an insulating fuse
tube having a contact at one end provided with
an aperture and pivotally mounted upon the ?rst
of said terminal members, the other end of said
fuse tube being normally positioned adjacent the
second of said terminal members and having an
open end, a headed fuselink extending through
the aperture in said contact with the head of the
fuse link located on the outer side of said contact,
and means carried by the second terminal mem
ber for removably locking the fuse link to said
second terminal member to hold said fuse tube
in position against rocking motion, said ?rst
terminal member including spring means bearing
against the head of said fuse link and producing
contact pressure and tending to rock said fuse
tube towards inoperative position away from said
- second terminal member.
~10
6. A fuse construction comprising an insu
lating body portion having a. ?rst and a second
terminal member projecting therefrom, means
carried by said terminal members for the recep
tion of conductors, said ?rst terminal member
having a hooked portion, an insulating fuse tube
having an open end and having a contact carried
by the other end of said fuse tube and provided
with a lateral extension removably hooked into
the hooked portion of said ?rst terminal member,
a headed fuse link projecting through the con
tact of said fuse tube with the head located on
the outer side of said contact, said fuse link ex
tending through- said fuse tube and out of the
open end thereof, and means carried by said sec
ond terminal member for removably locking the
projecting end of said fuse link to said second
terminal member to normally hold said fuse tube
in operative position, said ?rst terminal member
including relatively heavy spring means for ex
erting contact pressure upon the head of said
fuse link and tending to rock said fuse tube to
wards inoperative position.
‘ ~
3
fuse tube and out of the open end thereof, and
means carried by said second terminal member
for removably locking the projecting end of said
fuse link to said second terminal member to nor
mally hold said fuse tube in operative position,
said ?rst terminal member including relatively
heavy spring means for exerting heavy contact
pressure upon the head of said fuse link and tend
ing to rock said fuse tube towards inoperative po
sition, the offset from the contact of said fuse 10
tube being relatively short in comparison to the
length of said fuse tube, whereby the relatively
heavy contact pressure is translated into a rel
atively light pull on the fuse link.
' 8. A fuse construction comprising an insulat 15
ing body portion having a ?rst and a second ter
minal member projecting therefrom, means car
ried by said terminal members for the reception of
conductors, said ?rst terminal member having a.
hooked portion, a. fuse tube having an open end 20
and having a contact carried by the other
end of said fuse tube and provided with a lateral
extension removably hooked into the hooked por
tion of said ?rst terminal member, a headed fuse‘
link projecting through the contact of said fuse 25
tube with the head located on the outer side of
said contact, said fuse link extending through said
fuse tube and out of the open end thereof, and
means carried by said second terminal member for
removably locking the projecting end of said 30
fuse link to said second terminal member to nor
mally hold said fuse tube in operative position,
said ?rst terminal member including spring means
for exerting contact pressure upon the head of
said fuse link and tending to rock said fuse tube 35
towards inoperative position, said hooked por—
tion of said ?rst terminal member having means to
prevent the inadvertent detachment of the fuse
tube from said ?rst terminal member when said
fuse tube rocks to inoperative position.
9. A suspension fuse construction comprising
an insulating body portion having means for the
reception of conductors, whereby said body por
tion may be suspended, a ?rst and a second ter
minal member projecting from said body por
tion and having means for electrical connection
to said conductors, a fuse tube assembly pivotally
mounted upon said ?rst terminal member and
having an open end normally located adjacent
said second terminal member, the other end of
said fuse tube being closed when said fuse tube
is in operative position, an expulsible conductor
carried within said fuse tube and secured to said
second terminal member, and current responsive
means for releasing said fuse tube assembly upon 65
the occurrence of an overload.
10. A suspension fuse construction comprising
an insulating body portion having conductor re
ceiving means for suspending said body portion
from the conductors, a ?rst and a second terminal
member carried by said body portion and having
means for electrical connection to said conductors,
of said fuse tube and provided with a lateral oil’
a fuse tube assembly removably pivotally carried
by said ?rst terminal member and having an open
end normally located adjacent said second ter
minal member, the other end of said fuse tube
being closed when said fuse tube is in operative
position, means tending to rock said fuse tube
assembly to move the open end thereof from adjacent said second terminal member, an expulsible 70
set removably hooked into the hooked portion of
conductor carried by said fuse tube assembly and
said ?rst terminal member, a headed fuse link
removably locked to said second terminal mem
ber, and current responsive means for releasing
said fuse tube assembly upon the occurrence of an
overload.
'7. A fuse construction comprising an insulating
body portion having a ?rst and a second terminal
member projecting therefrom, means carried by
said terminal members for the reception of con
ductors, said ?rst terminal member having a
hooked portion, a fuse tube having an open end
and having a contact carried by the other end,
projecting through the contact of said fuse tube
with the head located on the outer side of said
75 contact, said fuse link extending through said
4
2,113,682
11. A fuse construction comprising a. body por
tion, terminal members carried by said body por-'
tion and having means for electrical connection to’
spring pressure under conditions of violent ex
plosion.
. 14. A fuse structure comprising an insulating
body portion, a first and a second terminal mem
conductors, at least one of said terminal mem
bers being stationary, a drop-out fuse assembly
ber carried byv said body portion and projecting
therefrom, means carried by said terminal mem
bers for receiving conductors, an insulating fuse
normally connecting said terminal members and
having one end movable away from its correspond
ing terminal member, and a fuse link carried
within said fuse tube and projecting outwardly’
10 therefrom and directly connected to said‘ sta
tube having a contact at one end provided with
an aperture and pivotally mounted upon the ?rst
of said terminal members, the other end of said
fuse tube being normally positioned adjacent 10
tionary'terminal member for normally holding
the movable end I.of said fuse ‘tube against motion
away from the corresponding terminal member,
the other end of said fuse link having'a headed
portion normally closing said fuse tube.
12. A fuse construction comprising a body por
tion, an expulsion fuse assembly including an in
sulating fuse tube open at one end, a fuse link
having a head closing the other end of said fuse
tube, a ?rst terminal member carried by said body
portion and pivotally supporting said fuse tube
the second of said terminal members and having
an‘ open end, a headed fuse link extending through
the aperture in said contact with the head of the
fuse link located on the outer side of said con
tact, means carried by the second terminal mem
ber for removably locking the fuse link to said
second terminal member to hold said fuse tube in
position against rocking motion, and a contact
spring electrically connected to said ?rst ter
20
minal member and bearing against the head of
and exerting spring pressure against the head of . said fuse link, said spring producing contact pres
said fuse link tending to rotate said fuse tube sure and tending to rock said fuse tube towards '
and holding the head in sealing relation to said inoperative position away from said second ter
25 fuse tube, and a second terminal member carried
minal member.
‘
25
by said body portion, said fuse link extending out
15. A suspension fuse construction comprising
from-the open end of said fuse tube and normally a body portion formed of insulating material and
holding said open end against motion with refer
having spaced apertures for the reception of‘
ence to said second mentioned terminal member.‘ looped conductors, terminal members carried by
13. A fuse construction comprising a body por
said body portion and electrically connected to 30
tion, an expulsion fuse assembly including an in
said conductors, and a drop~out fuse assembly
sulating fuse tube open at one end, a fuse link‘ normally electrically connecting said conductors,
having a head closing the other end of said fuse‘ said drop-out fuse assembly including an insulat
tube, a ?rst terminal member carried by said body ing tube enclosing a fuse link and located below
35 portion
and pivotally supporting said fuse tube said body portion.
35
16. A suspension fuse construction comprising
‘and exerting spring pressure against the head of
said fuse link tending to rotate said fuse tube a body portion formed of insulating material and
and holding the head in sealing relation to said having spaced apertures for the reception of
looped conductors, terminal members carried by
40 fuse tube, and a second terminal member carried said body portion and electrically connected to‘
by said body portion, said fuse link extending out
40
from the open end of said fuse tube and normally said conductors, a drop-out fuse assembly nor
mally
electrically
connecting
said
conductors,
and
holding said open end against motion with refer
a spring biasing said fuse assembly towards drop
ence to said second mentioned terminal member, out movement.
the head of said fuse link being movable against
’
ALWIN G. STEINMAYER.
45
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