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Патент USA US2115592

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April 26, 1938.
S. R. SMITH
'
2,115,592
ELECTRIC FUSE DEVICE
Filed Nov. 1, 1935
2 Sheets-Sheet l
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i
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Fig. (3.
Inventor:
Sidney R. 5mit h,
6? SW
is Attorney.
' April 26, 1938.
s. R. SMITH
2,1 15,592
ELECTRIC FUSE DEVICE
Filed Nov. 1
2 Sheets-Sheet 2
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Invent or‘:
Sidneg R. Smith,
b3 ?lm/755W
His Attorn eg
2,115,592
Patented Apr. 26, 1938
UNITED STATES PATENT OFFICE
2,115,592
, ELECTRIC FUSE DEVICE
Sidney R. Smith, Lenox, Mass., assignor to Gen
eral Electric Company, a corporation of New
York
Application November 1, 1935, Serial No. 47,768
20 Claims.
(Cl. 200-1155)
The present invention relates to fuse devices
and has for a principal object the provision of
improvements in the construction of fuse devices
particularly adapted to be mounted directly on
5 the overhead line wires of a secondary electrical
of mounting the device of Fig. 8 upon an electric
line conductor;
distribution system. ‘
Other important objects of the invention are
the provision of improved fuse devices of the
type above referred to having low initial cost
10 .and low upkeep cost and which provide protection
of the fuse link and other operating parts from
the weather to thereby reduce maintenance care
and insure efficiency and reliability of operation
under all conditions; which give positive and
15 clearly observable indication of fuse operation;
Fig. 13 is a sectional elevation of a third form
of fuse device, constructed in accordance with
the present invention, and Fig. 14 is a partially 5
cut away view of the device showing the parts‘
after rupture of the fusible element; Fig. 15
shows the détails of an improved form of clamp
ing means for securing the fuse device of Fig. 13
to a line conductor, and Fig. 16 illustrates dia
grammatically the manner of mounting the de
vice of Fig. 13 on a line conductor, while Fig. 1'7
illustrates a modi?ed form of clamping device for
securing the fuse device of Fig. 8 on a line con
ductor.
15
Referring to Fig. 1 of the drawings, 20 desig
which are safe and easily accessible for re-fusing
n'ates a block or box of suitable insulating mate
with provision for automatic protection of the
rial formed in two parts 2| and 22 which parts
lineman whose duty it is to service the line equip
ment, and which permit ready and quick installa
are formed with recesses cooperating to provide
, an explosion chamber 23 within the interior of 20
20 tion thereof in almost any kind of secondary dis
tribution system and facilitate the safe intercon
necting of transformer secondaries in electrical
the block. The two parts of the block are secured
in assembled relation in any suitable manner as,
for example, by means of bolts 24 passing through
networks.
Other objects of the invention and the manner
25 in which the invention is carried out will become
apparent from the fo1l0wing..description taken
in conjunction with the accompanying drawings
aligned openings in the parts and fastened in
place by means of nuts 25. The block is provided 25
with aligned passages 26 and 26' extending out
wardly through the component parts thereof from
the explosion chamber 23 to the opposite faces
of the block.
The opposite faces of the block are provided 30
in which Fig.'l is a sectional elevation of one
form of fuse device, constructed in accordance
' 30 with the ,present invention, showing the parts in
the positions they assume when the fusible ele
ment is intact; Fig. 2 is aside elevation of the'
device showing the parts after rupture of the
fusible element, and Fig. 3 is a front elevation
35 of the device; Figs. 4 and 5 illustrate details of
an improved form of fuse contact clamping de
vice;
Fig. 6 shows in detail the parts of an improved
clamping device for securing a fuse device to an
40
electrical line conductor;
Fig. '7 illustrates diagrammatically the manner
of mounting the device of Fig. 1 on a line con
ductor;
45
.
Fig. 8 shows a second form of fuse device, con
structed in accordance with the present inven
tion, with the parts thereof in the positions they
assume when the fusible element is intact; Fig. 9
is a view partially cut away and partially in
section of the same device showing the parts after
rupture of the fusible element; Fig. 10 illustrates
a section taken along the line Ill-l0 of Fig. 9,
and Fig. 11 illustrates a section taken along the
line H-Il of Fig. 9;
55
Fig. 12 illustrates diagrammatically the manner
with recesses 21 and 21’ in the upper portions of
which are secured, by means of screws/2H ;the
mounting plates 29 and 29' which are so fo'_' ed
as ,to project outwardly from the recesses as illus
trated and to turn up substantially parallel with 35
the opposite faces of the block to provide flanges
30 and 30'. Also disposed one in each of the
recesses 21 and 21' are plate members 3| and 3|’
respectively which are hingedly mounted on the
mounting plates 29 and 29' as indicated at 32 40
and 32’. These plates are arranged to abut tight
ly against the bottoms of the recesses and are
biased outwardly to the positions shown in Fig. 2
by means of springs 33 and 33’ each of which
has one end secured to its corresponding hinged 45
plate and its other end secured to its correspond
ing mounting plate as shown.
On the hinged plates 3| and 3|’ are mounted
improved fuse contact clamping devices desig
nated generally in Fig. 1 by the numeral 34. The 50
details of. one of these devices are shown in Figs. 4
and 5.
It is to be understood that the two de
vices are the same in construction and hence
the same numerals will be used hereinafter to
designate like parts of each.
Each of these 55
2
2,115,592
clamping devices comprises a cylindrical boss 35
?xedly mounted in an opening 36 in the plate 3|,
or 3|’ as the case may be, in any suitable manner
as by means of the riveted connection indicated
at 31, and an annular member 38, which is
mounted on the boss 35 for coaxial rotation there
about. Boss 35 is provided with a longitudinal
opening 39 eccentric of the axis of the boss and
is provided also with an annular recess 40 adja
cent the point of connection of the boss to the
plate 3 l. Member 38 has an internally projecting
?ange 4| arranged to move in the recess 49, the
inner rim of the ?ange being eccentric to the
axis of rotation of member 38, with portions of the
15 rim, such as those designated 42, having a greater
radial distance than other portions such as that
designated at 43. The recess 48 is so‘formed
over a portion of the extent thereof that it in
tersects or opens into the passage 39 and hence
20 the eccentric rim 4| of member 38 projects into
10
springs 33 and 33' to maintain the plates 3| and
3|’ in their innermost positions.
In order to mount the fuse device upon an elec
tric line conductor, an improved removable
clamping means is provided which is designated
generally in Fig. 1 by the numeral 48, the details
of the clamping means being shown in the ex—
ploded view of Fig. 6. As will be seen from Fig.
6, the clamping means consists essentially of a
supporting plate 50, a resilient plate 5|, a clamp 10
ing plate 52, guide means for maintaining the
three plates in proper assembled relation and
screw means for drawing the clamping plate and
the supporting plate together. Supporting plate
'59 is provided with openings 53 for receiving 15
screws 54 which serve to fasten the plate ?rmly
to the ?ange 30' of the mounting plate 29’ se
cured to the block 29. Plate 52 is formed with a.
bent over ?ange or U-shaped portion 55 which is
the passage 39 to varying degrees in accordance arranged to ?t over the edge 56 of a curved por~ 20
with the distance of the rim portion from the . tion 57 of the supporting plate 50 to thereby pro
axis of rotation. Plate 3! and the riveted over vide a hinged connection between the two plates._
portion 31 of the boss 35 have an opening 44 Plate 5| is formed to ?t between the plates 50
25 formed therein in substantial alignment with the
and 52 and is provided with a bent over ?ange
passage 39.
portion similar to that of plate 52 and having a 25
In order to clamp a wire or like tubular element projection 58 adapted to extend between the
to the plate 3i by means of the clamping device curved portion 51 of plate 50 and the plate 52
34, member 38 is turned to such position that the and having also projections 59 which extend be
30 rim portion 42 thereof is in proximity with the tween the curved portion 51 and the downwardly
opening 44. This rim portion, which has the projecting portion of the bent over ?ange 55. 30
greater radius, does not project into the passage This resilient plate 5| acts to swing the plate
39 and the wire may therefore be inserted into 52 outwardly away from the plate 50 about the
hinged connection. An eyebolt 69 is provided for
the opening 44 and the passage 39 without ob
drawing the plates 59 and 52 together in oppo
35 struction being offered thereto. The member 38
is then rotated on the boss 35 to cause the lesser sition to the action of the resilient plate 5|. This 35
bolt has a bearing ?ange 6|, which abuts against
radius ?ange portion 43 to project into the pas
sage 39 and the wire is- clamped thereby between the outer face of plate 52, and a threaded por~
the rim of the ?anged portion and. the opposite tion 62 which extends through openings in the
40 wall of the passage 39. In order to effect an even two plates 50 and 52 into engagement with a
more e?icient clamping connection, the rim of screw threaded nut 63 secured in any suitable 40
the ?ange may be slightly sharpened to enhance manner to the outer face of plate 50. The two
plates 50 and 52 are provided with depressions 84
its grip upon the surface of the wire.
With the apparatus previously described, the and 65 respectively which cooperate to receive
45 mounting of the common types of fuse link in a wire as shown in Fig. 1, and plate 52 is pro
the block 20 becomes a very simple matter. The vided with a portion 66 which is bent outwardly
fuse link is inserted through one of the passages to aid in guiding the wire into the recesses 64
26 or 26' and is so located that its fusible portion and 65. Plate 52 is provided with two projecting
45 is disposed within the explosion chamber 23.‘ pins 61 and 68 which are arranged to extend into
50 The fuse link may or may not be provided with openings 69 and 10 respectively provided in the
plate 50 to thereby maintain the plates in properly’ I’
a strain wire 46 as found desirable. The connec
assembled relation. The clamping means just
tion shanks or contacts 41 of the fuse link pro
trude outwardly through the passages 26 and 26' described serves not only as a supporting means
for the fuse device but also provides electrical
for engagement by the clamping devices 34 car
55 ried by the plates 3| and 3|’. Members 38, which connection between the wire engaged thereby and
the flange 30' of plate 29'
preferably are knurled, of the clamping devices,
are turned as previously described to such posi
tions that when the hinged plates are pressed into
which is in electrical .
conductive relation with the fuse contact clamp
ing device 34.
abutting engagement with the faces of the block
Other clamping means are mounted on the
block 20 for securing an electric lead Wire or line
44 into the passages 39 of the clamping devices;
Members 38 then are rotated to bring the rim
portions 43 thereof into engagement with the
shanks to thereby effect a secure clamping en
65 gagement thereof.
It will be seen that with the arrangement just
described the fusible portion 45 and the end
conductor thereto in conductive relation with the
other fuse contact clamping device 34, and com
prise a U-shaped member ‘H the two legs of which
are adapted to be fastened onto the block 20, one
disposed on each side of the ?ange 30 of the sup
porting plate 29, and to be held in place by means
60 20. the shanks 47 project through the openings
of screw 12 and lock washers 13.
A screw 14 in
stantially completely enclosed within the cham
threaded engagement with an opening in the
U-shaped member serves to rigidly clamp a. feed
wire or line conductor within the closed portion
tively protected from all weather conditions, the
of the U-shaped member as shown.
shanks or contacts 41' of the fuse link are sub
70 ber 23 and the passages 26 so that they are effec
inner surfaces of the plates 3| and 3|’ serving
to eifectively close the outer ends of the passages
26 and 26’_respectively. The tensioned fuse link
75 acts in opposition to the biasing force Of the
'
In an electrical distribution system the fuse
device previously described is adapted to be
mounted upon a line conductor and either con
nected across a strain insulator or used with or
without an insulator in conjunction with a rack 75
3
2,1“,592
As will be understood from the preceding de
or cross arm assembly. Fig. '1 shows, for ex
ample, the manner in which the device may be
scription, re-fusing of the device may be accom
connected across a strain insulator, designated
by the numeral 16, to which are connected the
line conductors 11 and 18. Before the fuse de
lead wire or bared conductor end 11' from the
clamp 1i and then unscrewing the clamping
means 48 whereupon the fuse device may be lifted
from the supporting line conductor and may be
vice is mounted upon the line conductor, a fuse
plished readily and quickly by ?rst removing the
link is installed therein in the manner illustrated
in Fig. l with the clamping devices 34 securely
engaging the ends of the link so that plates 3|
10 and 3!’ are held in their inward positions. Also,
eyebolt 60 of the clamping means 48 is screwed
conveniently re-fused without danger to the line
man.
outwardly so that the clamping means may be
slipped easily over a bared section 18' of the line
The second embodiment of improved fuse de 10
vice illustrated in Figs. 8 to 11 inclusive consists
essentially of a short fuse tube 80 of suitable in
sulation material having a two-part terminal
cap 8| mounted on the upper end thereof and a
conductor 18, the curved portion 66 of the clamp
15 ing plate 52 serving as previously outlined to
guide the conductor into the recesses 64 and 65
of the plates 50 and 52 respectively. During the
mounting operation the fuse device may be sup
combination electric lead and fuse terminal 15
clamping cap 82 connected to the other end
thereof by means of an insulating tube or casing
83.
The lower end of the tube 80 is telescoped
within and longitudinally slidable with respect
ported in any suitable manner as by means of a
to the upper end of the casing 83 as more clearly 20
20 switch stick the end of which is inserted through
the eyelet of eyebolt 60. When the fuse device
has been mounted upon the line conductor, bolt
60 is turned to draw the plates 50 and 52 together
and thereby effect ayrigid and non-movable en
25 gagement of the clamping means with the. bared
section 18’ of the line conductor, one end of the
fuse link thus being electrically connected to the
shown in Fig. 9. A coil spring 84, surrounding
the tube 80 and having its lower end seated in a
recess 85 of the casing 83 and its upper end in
abutting engagement with the lower surface of
the terminal cap 8|, serves to bias the two tubes 25
supporting line conductor 18 through the right
apart into extended positions while pins or screws
86, mounted on the outer surface of the tube 80
and movable in slots 81 formed in the inner sur
face of the tubular casing 83, serve to limit the
hand (as viewed in 'Fig. 1) clamping device 34,
30 hinged plate 3|’, mounting plate 29', and sup
porting plate 50. As a final operation, the end
11', previously bared, of the line conductor 11 is
inserted through the opening in the U-shaped
member 1| and tightly clamped in position by
35 means of screw 14 thus providing electrical con
nection from line conductor 11 through clamping
member 1|, mounting plate 29, hinged plate 3|,
relative movement between the telescoped tubes. 30
These screws 86 and cooperating slots 81 also
serve to prevent relative rotation of the tubes
about their common axis.
Terminal cap 8| serves not only as a fuse con
tact but also as a means for supporting the fuse 35
device on an electric line conductor. To this end,
it is provided with an inner cap 90 screwed onto
the upper end of the tube 80 and having an outer
and the left hand clamping device 84 to the other
end of the fuse link. The sequential mounting
40 operation just outlined is made possible by the
improved arrangement of the parts of the fuse
device and mounting means therefor and is an
important safety feature giving added protection
45
to a lineman either installing the device for the
?rst time or re-fusing the device after operation
thereof.
In operation, blowing of the fuse link results
in the formation of an arc and the production
of gases in the explosion chamber 23 which cre
ates a pressure in the chamber tending to blow
screw threaded portion for removable connection
to an inner screw threaded portion of a sup
40
porting cap 9|. A lock washer 92 is provided for
insuring a tight connection between the inner
cap 80 and the end of the fuse tube 80 while the
cap 90 has a centrally disposed opening for the
accommodation of the shank 93 of a button head 45
type fuse link, the button head 94 of which is
clamped between the caps 90 and Hi. It is to
be understood that, with slight modi?cation well
26’. The result is that the plates or doors 3|
and iii’ are blown outwardly to effect separation
of the fuse shanks or contacts 41. Springs 33
55 and 33’ aid in this outward movement of the
within the range of mechanical skill, the fuse
device may be adapted for other well known 50
forms of fuse links.
On the upper end
mounted a clamping device for securing the fuse
device to a line conductor. A preferred form of
such clamping device is illustrated in Figs. 8 and 55
9 and comprises a stud member 95 extending up
their outward positions after rupture of the fuse
link to give a positive and clearly observable in
dication of the operation of the device. Collec
tion of ice, sleet and other undesirable foreign
60
matter upon the working parts of the fuse device
slot 96 for the reception of an electrical conduc
tor as illustrated. In order to hold the conduc
tor in the slot 96, the outer surface of the stud 60
is provided with a screw threaded portion for
engagement with a clamping nut 98 which upon
50 the gases outwardly through the passages 28 and
doors and also serve to maintain the doors in
in a manner to impair the emciency and de
pendability of operation thereof is prevented by
the substantially complete enclosure of the fuse
link within the chamber 23 and the passages 26
65 and 26', by the closing of the ends of the passages
by means of the plates 3| and BI’ and by the
mounting of the plates in such manner that they
normally repose in the bottoms of the recesses 21'
and 21' respectively in the opposite faces of ' the
70 block or casing 20. Furthermore, the two clamp
ing devices 48 and 1| provide under all weather
conditions effective means for electrically con
necting the fuse contacts to the respective line
75
conductors.
'
wardly from the cap SI and having a transverse
being screwed downwardly presses against the
metal clip 99 and effects a tight clamping engage
ment upon the conductor.
,
An alternative form of clamping means is illus—
trated in Fig. 1'7. In this case the outer sup
porting cap I80 cf the two-part terminal cap
mounted on the end of tube 88 is formed with
an arm IOI extending outwardly at one side 70
thereof substantially at right angles to the tube
and a downwardly curved guide portion I02 ex
tending outwardly at the other side thereof.
This guide portion curves inwardly to a depres
sion I03 which is provided adjacent the button 75
4
2,115,592
cap 94 of the fuse link for the accommodation
of a line conductor in engagement with the but
ton cap. At the outer end of the arm IN is
hingedly mounted a clamping arm I04 arranged
to extend in substantially parallel relation with
the arm IM and having a recess I05 for coopera
tion with the recess I03 of the cap I00 to clamp
the conductor therebetween and having also an
upwardly curved portion I06 for cooperation with
10 the curved portion I102 to guide the conductor
into the recesses. In order to securely clamp a
conductor, such as that indicated at ill, in the
recesses I03 and I05, an internally threaded wing
nut I 01 is rotatably mounted in an opening I00
15 in theclamping arm I04 and is arranged to en
gage a screw threaded element I09 pivotally
cap type. is inserted into the fuse tube 80
through the opening provided in the terminal cap
80 and, with the tubes 80 and 83 compressed,
the lower end or extension H4 of the fuse link
is clamped in the central opening H3 of the
lower terminal cap 82 by means of the clamping
screw II'I so that the tubes are maintained in
contracted telescoped relationship in opposition
to the biasing force of the coil spring 84. The
fuse device is then ready to be connected to the
supporting cap Si or I00, as the case may be,
by screwing the cap 90 into the supporting cap
as previously outlined. The bared end I28’ of
the other line conductor I28 is then inserted into
the slot I22 of the lower cap 82 and securely
clamped in place by means of the metal clip I24
mounted on the arm IOI as indicated at H0.
Tubular casing 83, of the device illustrated in and the clamping nut I25. An important fea
Figs. 8 and 9, has formed thereon an annular ture of this last described device is that, due to
20 flange or skirt ill for preventing electrical the prevention of relative rotation between the
creepage and has mounted on the lower end' tubes 00 and 83 and due to the slotted construc
thereof the clamping terminal cap 82 which is tion of the stud i2I, it is impossible to screw the
secured in place by means of screws H2 which upper terminal cap 00 of the fuse tube 80 into
extend through openings in the terminal cap the supporting cap mounted on the supporting
25 and into openings provided in the wall of the line conductor if the other line conductor has
casing 83 as clearly illustrated in Fig. 10. This previously been clamped to the lower terminal 13 U!
lower terminal cap has a centrally located open- - cap 82. Added safety to the lineman installing
ing II3 in alignment with the passages in the the fuse device is thereby insured in that the
?nal act of the installing operation is necessarily
tubes 00 and 83 for the reception} of an exten
30 sion H4 of a fuse link extending through the the simple insertion of the lead wire or conduc
telescoped tubes. When the fusible portion H5, tor end I28’ into the lower terminal clamping 30
and the strain wire II6 if such be provided, of means and the danger of coming in contact with
both of the terminals of a live fuse element is
the fuse link are intact and the tubes 80 and 83 thereby
avoided.
are in contracted telescoped relationship, the
35 extension II4 of the fuse link extends into the
opening H3 where it is securely fastened by
The advantages of the fuse device just de
scribed are similar to those pointed out in con- .
means of clamping screw II‘! which is mounted nection with the embodiment ?rst described in
in a screw threaded opening H8 extending . that the fuse link is at all times enclosed within
through the sides of the cap 82 as shown in Fig. a chamber formed in the interior of the telescoped
40 11. An observation opening H9 also is formed tubular members and is therefore protected from
all sorts of weather conditions. Furthermore,
in the terminal cap at right angles to the open
ing H8 to facilitate the clamping of the fuse danger of non-operation of the fuse device due
extension. The terminal cap has also exhaust to formation of ice or sleet coating on the opera
ports I20 in communication with the interior of
45 the casing 83 for the release of gases therefrom
upon the blowing of the fusible element.
A clamping stud member I 2I, similar to that
‘provided on the upper supporting cap 9|, is
formed on the lower cap 82 and has a trans
60 verse slot I22 for the reception of a wire con
ductor and a metallic clip I24. The stud is ex
ternally screw threaded to provide for the screw
ing thereon of a clamping nut I25.
The installation of the fuse device illustrated
65 in Figs. 8 and 9 is similar to that of the ?rst
embodiment~previously described and similarly
it may be either connected across a strain insu~
lator or mounted with or without an insulator
'in a rack or crossarm assembly in a distribution
60 system.
In the mounting of the device in the
manner illustrated in Fig. 12, the supporting cap
9| -or the supporting cap I00, as the case may
be, is ?rst unscrewed from the terminal cap 80
and is then secured to the bared portion I26’ of
a line conductor I26 which is fastened at its end
to a strain insulator I21.
It will be seen that
the clamping means illustrated in ‘Figs. 9 and
17 both are effective when properly clamped to
prevent rotation of their associated supporting
70 caps about their longitudinal axes. If desired,
however, the clamping means may be made ro
tatable with respect to the supporting cap, but
the rigid construction is usually to be preferred.
A fuse link, which may be of any suitable form
and which is illustrated as being of the button
tive parts is guarded against by the abutting
engagement of the upper terminal cap BI with
the upper end of the casing 83 when the fuse link 45
is intact, which engagement insures substantially
complete enclosure of the inner slidable fuse
tube 80 and the biasing spring 84. A positive
indication is also given upon rupture of the fuse
link by the springing apart of the telescoped 50
tubes into their extended relationship. If de
sired, the outer surface I29 of the fuse tube 80,
which is exposed upon operation of the fuse de
vice, may be painted red or some other bright
color to accentuate and make more readily ob
servable from the ground the indication of the
fuse rupture. E?icient operation of the fuse de
vice is insured in that the explosive force of the
gases given off in the interior of the tube and
the forcing apart of the fuse terminals by the 80
spring facilitates the quenching of the arc formed
upon rupture of the fuse element, and the ex~
haust ports I20 in the lower terminal cap serve
to relieve the pressure within the tubes and pre- .
vent rupture thereof.
A third form of improved fuse device embodying 65
the present invention is ‘illustrated in Figs. 13
and 14 and comprises a fuse tube I30, of suitable
insulation material, having a metallic terminal
member I3I screwed into one end thereof and a
mounting device secured adjacent the other end 70
thereof. Terminal member I3I is in the form of
an elongated hollow metallic tube arranged to
receive in one end thereof the lower end I32 of
a fuse link extending through the tube I30.
A75
5
2,115,592
clamping screw I33 extending through a thread
ed opening in the side wall of the terminal mem
ber is provided for clamping the end of the fuse
link against the inner side wall of the terminal
member. The outer end of the terminal member
is formed to permit a plug and sleeve connection
' to an electric lead wire and to that end has a
central bore I34 for the accommodation of a
bifurcated plug I35, which plug has a bore I36 in
the end thereof for the accommodation of a line
conductor or electric lead wire. The plug is se
cured to the terminal member‘by means of a
screw I31 extending through an opening in the
side wall of thcbore I34 and into engagement
with the plug while the conductor or lead wire is
15
secured in the bore I36 of the plug by means of
screws
I38.
'
The other end of the fuse tube I30 is provided
with a terminal cap I40 having a central bore I“
for the accommodation of‘ the other end I42 of
20 the fuse link and has a clamping screw I43 ex
tending through an opening in the wall of the
bore for clamping the end of the fuse link therein.
Terminal cap I40 has also an annular ?ange por
tion I44 which ?ts over the end of the tube I30
and cooperates with the body of the terminal'cap
for substantially closing the end of‘ the fuse tube,
the bore I4I being restricted by the end of the fuse
link and the end of the clamping‘ screw project
30
ing thereinto.
Referring to Fig. 15, I45 designates a U-shaped.
supporting member, the legs of which are pro
vided with inner facing concave portions I46 and
I41 which cooperate to engage the outer sur
face of the fuse tube I30. These curved portions
35
are clamped tightly upon the fuse tube by means
of a bolt I48 extending through openings in the
ends of the legs of the U-shaped member and
having a clamping nut I40 threadedly engaging
the end thereof. One or both of the curved
40
portions I46 and I41 may be provided, if desired,
with an internal projection I50 which engages a
depression formed in the outer surface of the
fuse tube to thereby prevent rotation of the fuse
in the supporting member.
45 tube
Slidably mounted on the outer end of the sup
porting member I45 is a U-shaped clamp I5l
having one leg I52 thereof, which is longer than
the other leg I53, held in slidable engagement
with the supporting member I45 by means of a
50 guide ring I54 surrounding the leg‘ I52 and a
portion of the member I45. A wing screw I55
out the mounting operation, a fuse link is inserted
into the open end of the fuse tube I30, the plug
I35 having been previously removed from the bore
I34 of the terminal I3I and the terminal cap I40
being in the position illustrated in Fig. 14. The
lower end I32 of the fuse link is securely clamped
in the central bore of the terminal I3I by means
of the clamping screw I33. Terminal cap I40 is
then bent downwardly into closing relation with
‘the end of the tube I30 and the other end I42 10
of the fuse link is secured in the terminal cap by
means of clamping screw I43. The assembled
fuse device can then be mounted upon the line
conductor I63 with the bared portion I63’ of the
line conductor extending between the U-shaped 15
supporting member I45 and the U-shaped clamp
ing member I5I, the wing screw I55 being turned
until the conductor is securely clamped between
the U-shaped members. Connection plug I35
withthe bared end I64’ of the other line con 20
ductor I64 connected thereto is then inserted
into the socket or bore I34 of the terminal mem
ber I3I and‘ the fuse device is in condition for
service. Upon rupture of the fuse element the
combined action of the spring strip I60 and the 25
gases generated within the tube I30 causes the
terminal cap I40 to move rapidly outwardly to
the position shown in Fig. 14 to thereby increase
the distance between the fuse terminals and fa
cilitates the extinguishing of the arc therebe 30
tween.
_
The advantages of the last described fuse device
construction are similar to those attendant upon
the use of the two previously described embodi
ments ,in that the device is simple and easy to 35
manufacture, may be installed and serviced with
ease and safety, is e?icient and reliable in opera
tion under all weather conditions due to substan
tially complete enclosure of'the fuse link within
the enclosed chamber, and gives a positive indi 40
cation clearly observable from the ground of fuse
operation.
What I claim as new and desire to secure by
Letters Patent in the United States is:
'
1. A fuse device of the enclosed type adapted 45
to be suspended from an electric line conductor
and including in combination an, insulating cas
ing having a passage extending therethrough and
a pair of terminal members one at each end of
the passage for supporting a fuse element in the 50
passage, one of said members being arranged to
substantially close the end of the passage adja
cent thereto and having mounting means in
extending through aligned openings I56 and I51 cluding a resilient element operative to move said
in the ends of the U-shaped members‘ I5I and one element outwardly to an indicating position 55
I45 respectively, engages a clamping nut I50 dis ~upon rupture of said fuse element, means for
55
posed interiorly of the member I45, and serves electrically connecting said terminal members
to clamp an electric conductor between the ends respectively to said line conductor and to a sec
of the two U~shaped members as shown.
ond electrical conductor and means for mount
Rigidly clamped between the end of the mem
ing the casing on the line conductor including a
ber I45 and the clamping nut I50 supported there
clamping device removably engageable with the
60
by are the ends of a metallic spring strip I60
conductor.
and a metallic conducting strip I6I the other ends line
2. A fuse device adapted to be supported by an
of which strips are secured to theterminal cap electric line wire and including in combination
I40 as indicated in Fig. 13. Spring strip I60 is an insulating casing formed to substantially com 65
operative
to bias the terminal cap from its closing pletely enclose a fuse element with the ends of
65
position shown in Fig. 13 to its outward position the element projecting outwardly through open
shown in Fig. 14 and conducting strip I6I serves ings in opposite sides of the casing, a pair of
to electrically connect the terminal cap I40 with outwardly biased spring actuated fuse contact
the supporting clamping means and the line con
clamping devices hingedly mounted one on each 70
of said opposite sides of the casing and each ar
70 ductor.
In Fig. 16 is illustrated diagrammatically the ranged to engage a protruding end of said fuse
manner of connecting the fuse device last de
element, means carried by said casing for remov
scribed across a strain insulator I62 to which are
ably mounting the casing on an electric line wire
connected the line conductors I63 and I64 of an and for providing electric connection between 15
overhead distribution system. In order to carry
75
6
2,115,592
the line wire and one of said contact members,
and other means carried by said casing for en
gaging an electric lead wire and for providing
electrical connection between said lead wire and
the other one of said contact devices.
10
.
3. A fuse device adapted to be suspended from
an electric line wire including in combination a
block of insulation material having a recess in the
interior thereof to provide an explosion chamber
and having passages extending outwardly from
said chamber to two opposite faces of the block, a
pair of outwardly biased spring actuated metallic
ing bolt extending through said plates at a point
intermediate the said hingedly connected edges
and the said jaw portions thereof for drawing the
plates together against the action of said resilient
element, and means carried by one of the plates
provided for fastening the same to the device to
be mounted.
7. Clamping means for removable mounting
purposes including in combination a plate adapt
ed to be secured to a device to be mounted and
having an outwardly projecting edge portion, a 10
plate members hingedly mounted one on each of. second plate having a bent over ?anged portion
,arranged to ?t over said edge portion to provide
said opposite faces of the block and each ar
15 ranged when in inward position to substantially
close the outer end of one of said passages, fuse
contact clamping means carried by each of said
plates for engaging an end of a fuse link disposed
in said chamber with its ends projecting outward
20 ly through said passages, means for supporting
said block on an electric line wire including a
clamping device removably engageable with the
line wire and mounted on the block in conductive
relation to one of said plates, and other clamp
25
ing means mounted on said block in conductive
relation to the other of said plates for electrical
ly connecting a second electrical conducting
wire thereto.
30
.
4. In a clamping device for engaging a wire or
like tubular element, a pair of members mount
ed in substantially abutting relation and rela
tively rotatable about a common axis, each of
said members having an opening therein eccentric
with respect to said axis and said openings be
ing so disposed with relation to each other that
when said members are in certain relative posi
tions the openings provide a passage for the
loose accommodation of said aforementioned tu
bular element and that when said members are
40 in certain other relative positions portions of
the rims of the openings cooperate to clamp said
35
tubular element tightly therebetween.
5. In a clamping device for engaging a wire or
like tubular element, a substantially cylindrical
45 member having a passage extending longitudinal
ly therethrough eccentric with respect to the axis
of the member, said member having also an an
nular recess formed in the outer surface there
of with the recess for a portion of the extent
50 thereof opening into said passage, and an annu
lar member mounted on said ?rst member for
rotation thereabout and having an inwardly pro
jecting ?ange movable in said recess, the inner
rim of said ?ange being eccentric with respect to
55
the axis of said members and being arranged
when said second member is rotated into prede
60
termined positions with respect to said ?rst mem
ber to project into said passage to cooperate with
the wall of the passage for tightly clamping such
aforementioned tubular element therein.
6. Means for removably mounting an electric
device on a line wire or the like comprising a pair
of substantially ?at plates arranged in side by
side relationship with one of the plates hingedly
65 connected along one of its edges to the corre
sponding edge of the other of the plates, said
plates having formed therein at a distance from
the said hingedly connected edges thereof jaw
portions arranged to engage a line wire or the
70 like, at least one of said plates having formed
a hinge connection between the plates when they
are disposed in side by side relationship, said
plates having cooperating guide means for main
taining them in properly assembled side by side '
relationship and having also cooperating jaw por
tions for engaging a supporting member, a re
silient member formed to ?t over the said edge 20
portion of said ?rst plate and beneath the bent
over ?anged portion of said second plate and op
erative to swing said second plate away from
said ?rst plate about said hinged connection and
screw means operatively engaging said plates
for adjustably drawing the same together to
clamp said supporting member therebetween.
8. A fuse -device including in combination a
pair of tubular members at least partially tele
scoped one within the other and longitudinally 30
slidable with respect to each other, a pair of ter
minals carried one by each of said members, each
of the terminals having means for anchoring one
end of a fuse link which extends through said
members and serves to maintain the members in 35
contracted telescoped relationship by the tension
of the fuse link, means for effecting longitudinal
ly outward movement of at least one of said
members with respect to the other upon rupture
of a. fuse link extending between said terminals,
a clamping device secured to one of said mem
bers in electrical conductive relation with the
terminal carried by the last mentioned member
and arranged to engage an electric line wire for
supporting the fuse device thereon, and means 45
carried by the other of said members for se
curing a second conductor in electrical conduc
tive relation with the terminal carried by the said
other of the members.
9. A fuse device including in combination a
pair of tubular members at least partially tele 50
scoped one within the other and longitudinally
slidable with respect to each other, a pair of ter
minal caps mounted one on the outer end of each
of said members and each having means for
anchoring one end of a fuse link extending
through said members, means operative upon
rupture of said fuse link for effecting relative
movement between said members to give indica
tion of the rupture of the link, a supporting de
vice connected to one of said members in elec 60
trical conductive relation with the terminal cap
mounted thereon and having clamping means for
engaging an electric line wire, and clamping
means carried by the other of said caps for se
curing an electric lead wire thereto.
10. A fuse device including in combination a
fuse tube having a terminal cap on one end
thereof, a tubular casing having one end slid
on the edge thereof opposite to its hingedly ably telescoped over the end of said tube oppo 70
mounted edge a curved portion for guiding a line site to said cap and having a second terminal cap
wire or the like into engagement with said jaw mounted on the outer end thereof, means car
portions, a resilient element disposed between the _ ried by said caps for engaging the ends of a fuse
element extending through said tube and easing,
plates tending to force the same apart, a clamp
which said fuse element serves when intact to
75
2,115,592
maintain the tube and casing in telescoped re
lationship, means operative to force the tube and
easing apart upon rupture of said fuse element,
means for limiting the relative movement of the
tube and casing, a supporting member remov
. ably secured to one of said caps and having
means for fastening onto an electric conductor,
threaded portions for the removable securing of
the cap to the housing by relative rotation of
the cap and housing about the axis of said screw
threaded portions, and clamping means carried
respectively by said terminal cap and by the
other end of said housing for securing thereto
respectively a pair of conductors with the con
ductors extending transversely with respect to
and clamping means carried by the other of said
caps for engaging a second electric conductor.
10
11. A fuse device including in combination, a
the axis of said screw-threaded portions, thereby 10
to necessitate disconnection of a conductor from
pair of tubular members at least partially tele
scoped one within the other and slidable longi-l
tudinally outward with respect to each other, a
pair of terminal caps secured one to the outer
15 end of each of said members and each having
at least one of said clamping means in order to
permit rotation and removal of said cap from
said one end of the housing for installation or re
moval of a fuse link.
means for anchoring one end of a fuse link ex
tending through said members, means operative
upon rupture of said fuse link for effecting rela
tive movement between said members, clamping
15. In a fuse device of the type adapted to be
suspended from an electric line conductor, the
combination of a fuse tube having a bore for the
accommodation therein of a fuse link, a terminal
20 means carried by one of said terminal caps for
effecting engagement with an electric lead wire,
and means for mounting the fuse device on an
electric line wire including the other of said ter
minal caps and a supporting member removably
25 fastened to the last mentioned cap and having a
clamping device for removably engaging the elec
tric line wire.
cap mounted on one
end of said tube and having s
an opening in alignment with the bore in said 20
tube for the passage therethrough of a fuse link,
the rim of said opening being adapted to support
the button-head terminal of a button-head type
fuse link, and a clamping device carried by said
12. In. a fuse device, the combination of a
fuse tube having a two-part terminal cap, the
30 parts of said cap having cooperating threaded
cap arranged to engage a line conductor for sup 25
porting said fuse tube on the line conductor, said
clamping device having means for maintaining
the supporting line conductor in ?rm engage
ment with a fuse link button-head terminal rest 30
ing on the rim of said opening.
portions for removable connection thereof, one
of said parts being ?xed to one end of said tube
16. A terminal device adapted to be mounted
on the end of a fuse tube including in combina
and having means for supporting one end of a
fuse link disposed in the‘tube and the other of
said parts having means for fastening the same
to an electric conductor, a second tube disposed
telescopically about and longitudinally slidable
with respect to said ?rst fuse, means for prevent
ing relative rotation of said tubes about their
40 common axis, and a second terminal cap mount
ed on the end of said second tube opposite to said
?rst terminal cap and having means for effect
ing clamping engagement with the other end of
said fuse link and with a second electric conduc
tor.
13. In a fuse device, the combination of a fuse
housing, a terminal cap adapted to be secured
to one end of the housing, said cap and said one
end of the housing having cooperating screw
threaded portions for the removable connection
tion a pair of cap members one tightly secured
to the end of the fuse tube and having means for
anchoring one end of a fuse link disposed in the
tube and the second of said cap members being
removably secured to said ?rst cap member, said
cap members having also registering openings.
for the outward projection therethrough of said
one end of said fuse link and said second cap 40
member having a depression adjacent the open
ing therein for accommodating a wire conductor
in conducting engagement with the projecting
end of said fuse link, a clamping arm hingedly
mounted on said second member to swing into 45
engagement with said wire conductor, cooperat
ing guide means on said arm and said second
member for guiding said wire conductor into said
depression, and adjustable means for forcing said
clamping arm into engagement with said wire 50
conductor to clamp the said conductor in said
of the housing to the cap by rotation of the hous
ing relative to the cap about the axis of said
depression.
screw-threaded portions, said cap having means
fuse tube having terminal members disposed at
for clamping'the same on an overhead line wire
opposite ends thereof for supporting a fuse ele
or the like and for preventing rotation of the cap
on the line wine or the like about the axis of said
ment extending through the tube, one of said
members having means providing for the quick
detachable connection of an electric lead wire
thereto and the other of said members being
screw-threaded portions,'and clamping means for
securing a conductor to the other end of said
housing with the conductor extending transverse
60 ly with respect to the axis of said screw-thread
removable from the end of the tube, means car
60
ried by said tube for removably mounting the
ed portions, thereby to render extremely difficult
tube on an electric line wire and for electrically
the rotation of the housing to connect the said
one end thereof to said cap when the cap is
clamped on an overhead line wire or the like and
connecting said removable terminal member to
the line wire, and spring means operative to ef
fect movement of said removable terminal out 65
a conductor is secured to the said other end of
wardly from the end of the tube to an indicating
the housing by said second-mentioned clamping
position upon rupture of said fuse element.
means.
‘
14. In a fuse device, the combination of a fuse
housing having means at opposite ends thereof
for anchoring the respective opposite ends of a
70 fuse link extending through the housing, a ter
75
-
17. A fuse device including in combination, a
minal cap on one end of said housing arranged
to prevent access to the said anchoring means at
said one end of the housing, said cap and said
one end of the housing having cooperating screw
18. A fuse device including in combination a
fuse tube having a pair of terminal members
mounted one at each end of the tube for sup 70
porting a fuse element in the tube, at least one
of said terminal members being movable with
respect to the end of the tube adjacent thereto
and the other of said terminals having means
for connecting an electric lead wire thereto,
8
2,115,592
means for mounting said movable terminal mem
ber including a metallic spring strip operative
to eiTect outward movement of the movable mem
ber to an indicating position upon rupture of
said fuse element, and means for supporting said
tube and terminals on an electric line wire in
cluding a clamping device detachably engage
able with the line wire and, connected to said
tube and to said. spring strip.
10
19. In combination, a fuse tube having a ter
minal at one end thereof provided with means
for engaging one end of a fuse element extend
ing through the tube, means for detachably se
curing said tube to an electric line wire and for
15 electrically connecting said terminal to the line
wire, a terminal member secured to the other end
of said tube and having a longitudinal bore in
communication and substantially axial align
ment with the interior of said tube, means for
20 clamping the ‘other end of said fuse element in
said bore, and means for e?ecting quick detach
able connection of a wire conductor to said ter
minal member including a hollow sleeve formed
on the outer end of said terminal member and
a plug member formed to slidably engage said
sleeve with means carried by the plug for con
necting said wire conductor thereto.
20. A mounting device for removably securing
a fuse tube to an electric line conductor includ
ing in combination a U-shaped member adapted
to have its legs secured in engagement with op
posite sides of a fuse tube, means extending be
tween said legs for clamping the same in ?rm
engagement with the fuse tube, a second U 10
shaped member having one leg relativelg;r longer
than the other leg vthereof, means for mounting '
said second U-shaped member on said ?rst
U»shaped member with the closed end of the sec
ond member exteriorly of and substantially par 15
allel with the closed end of the ?rst member, and
with the longer leg of said second member in
substantially parallel slidable engagement with
one of the legs of said ?rst member, and adjust
able screw means interconnecting said members 20
for drawing the closed ends thereof together to
clamp said line wire therebetween.
SHENEY B. SMITH.
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