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Патент USA US2134523

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Oct. 25, 1938.
J. L. LEHNHERR
2,134,523
ELECTRICAL FUSE
Original Filed Feb. 15, 1952
2 Sheets-Sheet l
INVbNTOR
June L.L.ehn7~ierr
Oct. 25, 1938.
J. L. LEHNHERR
ELECTRICAL FUSE
2,134,523 v
Original Filed Feb. 15, 1932
2 Sheets-Sheet 2
Patented Oct. ‘25, 1938
>
_
i
t
2,134,523
UNITED STATES PATENT OFFICE
2,134,523
ELECTRICAL FUSE
June L. Lehnherr, Eldorado, Kans, assignor to
Westinghouse Electric& Manufacturing Com
pany, East Pittsburgh, Pa., a corporation of
Pennsylvania
- Application February 15, 1932, Serial No. 592,947
Renewed October 1'7, 1935
7 Claims. (Cl. 200-117)
This invention relates to an improvement in incident to the failure of the fuse. For instance,
electrical fuses such as are used in connection the failure of the fuse might set off an alarm sys
with transformers, power transmission lines and tem, or it might, in the case of the blowing of one
the like, although they may be designed for other fuse, operate a relay which would open the other _
5 purposes as will be later explained.
phases of a polyphase circuit.
.
6
Fuses for use as above mentioned have been
Another feature of my invention is that it per
made before but they have not been altogether mits the use of a very short fuse element, thus
satisfactory'as their working parts have been in-'
terfered with by weather conditions, such as ice
10 freezing in the working parts which prevents action of the parts and defeats. the purpose of the
fuse. This trouble is overcome by the use of my
reducing the cost of refusing. My device may also
be used over and over again and will provide over
load protection as well as fuse protection.
> My device will extend the ?eld of fuses and will
invade the oil circuit breaker ?eld since it will
improved device.
.
.
_
My improved fuse device does away with set
1‘’ screws, bolts, etc., leaving the exterior of the.
provide a- simple, economical means, of ‘quickly
breaking an electrical Circuit
This device will ?nd its place in fusing of power 15
or potential transformers, line sectionalizing or
wherever it is desirable to interrupt an electric
current at a predetermined rate of current ?ow..
fuse tube neat and doing away with the demand
for special tools in reloading the fuse.
'
Another feature of my improved fuse device
is that after the parts of the fuse are assembled,
20- the fuse tube is closed so that it is tight and practically weather proof, thereby keeping the interior
. of the tube dry and the parts therein in operative
condition at all times. The fuse tube being so
~
closed also prevents insects, dust, or other matter
entering or collecting in the tube which might interfere with the function of the fuse,
A further feature of my improved fuse device is
that the fuse element is held in tension in the
center of the fuse tube or barrel thereby eliminaty the heat of the ‘
fusethe
element
3O ing
burning of the barrel b
Another feature of my invention is that the {use
assembly is entirely self contained and no part
of the fuse 1m}; itself, or “pig-tail” connector is
35 exposed to the weather. This feature eliminates
corrosion of the metal or crystallization from
wind vibration,
A still further feature of my improved fuse device‘is that the hammer or impact principle em40 bodied therein insures positive clearance of the
interior of the tube of all metallic elements, separating the two parts of the electric circuit by the
full length of the non-conducting ?bre ‘or com_
position tube,
45
Another feature of my invention is that the device provides a simple method of refusing the tube
by a simple positive means, and the device is
adaptable to fuses of any size and for tubes which
are enclosed in an exterior housing as well as
60 tubes exposed to the weather.
>
A still further feature of my improved fuse is
that through the impact or kinetic energy of the
device in expelling itself from the tube it may be
used to operate ratchets,pawls or relays to accom-
55 plish any number or train of operations desired
While the internal parts of my fuse device are‘
Self expelling they will have the assistance 'of 20
gravity. or the explosion of the fuse in the .
Chamber, 01‘ both, in assisting to make a quick
interruption of the eil‘euit-
My device Provides, through the positive Shock
01‘ impact of the Spring 0!‘ Dhmger,eerteih Opera- 25
tion of the fuse for outdoor fuses during sleet or
ice storms. Another advantage is that the lower
or Contact and Sealing D1118 earl be recessed Slight
1y SQ 8-5 '60 minimize the forming of ice at the joint
between the contact plug and the fuse housing. 30
However, even though ice may form at this loca
tion, the positive action of the device will break.
any ice formed and insure the Clearing 0f the
fuse tube of all metallic content. This is particu
lerlv desirable on disconnect or sectionalizing s:
Switches which depend for their rupturing power
on the drop out principle of the entire fuse as
sembly- In case Of sleet,
the toggle
01‘ other
me
t holding
the fuse
assembly
eha-hieel arrangemen
_
111 Place may freeze up and fell to Operate The 40
use Of my Self expulsion mechanical device will
insure the rupturing 0f the fuse
There may be cases where it is inadvisable to
have the fuse device completely expelled from
the tube- In this case. however. the spring action 45
involved will insure the enlargement of the gap
after the failure of the fuse element.
'
The construction of this fuse device and its as
sembly with the other elements to make up the
complete fuse are such that it gives a positive 50
continuous metallic circuit from one end of the
fuse to the otherthus eliminating radio interfer
ence, which is a common defect of many types of
fuse.
'
_
Now referring to the lire-wings in which like 66
2.
2,134,523
On the upper end of the tube "I is a metallic
ferrule 30 having an internal
assembly as seen from the line I l [-1 H in Fig. 1.
Fig. 4 is a plan view
'
thereon which forms a channel 38 around the
'upper side of the
plug 34. At 39 is a notch in
the ?ange 31. The upper end of the "pig-tail”
29 is passed through the cone opening 35 and 15
the hole 36 then pulled upwardly until the pin
20
in the lower end of the rod is is lifted to the
15 in the tube H
is pulled on the fuse elements 24, 25, 28, 21 and 20
29 at which time the "pig-tail" 29 is bent over
and caught in the notch 39 and passed around
in the channel 38 and tied to temporarily hold
against the tension of the spring H. The cap 33
is now screwed on the portion 32 of the ferrule 25
30 so that the interior top of the cap presses
30
against the f‘pig-tail” 29 and ?rmly binds it
between the cap and the ?ange 31.
a drip to prevent ice forming between the plug I3 40
ment 2| being long enough to reach from the top
to the bottom of the tubular element H when
the rod I6 is slid downward in the tubular ele
ment It. From experimentation it has been
50
purposes above described.
In large fuse
60
and to theupper end 01' the pipe element H at
a point 270 degrees around the pipe I‘.
On the upper end of the rod I8 and rigid there
element 23 and 60
65
wire, etc., one end of which
the wire 22 and the other end being rigidly at- y
tached to the pin 20a which is amxed to the rod
70
rigidly attached to the
upper end 01' the
"pig-tail” 24.“ The upper end
of the wire 21 is
rigidly attached to the lower
end of a second
“pig-tail”, or ?exible copper
75 wire 2 9.
I
tube ‘H as previously described in Fig. 2.
7o
3 .
2,134,523
to release, ?re extinguishing devices 50 of one
be heated and melted with such rapidity-that it
might even pass off in a gaseous form; even the
wires 26 and 21 might be similarly affected, and
raise a gas pressure in the tube In and blow the
plug l3 and its attached parts out of the tube Hi.
There is another action taking place simulta
neously with that just described. It is as fol
lows: Upon the rupture between the wires 26
and 21, the spring |‘| contracts, driving the rod
|6 downward until the lower end of the rod l6
strikes the plug l3, as shown in Fig. 5, causing
an impact thereon and driving the plug l3 out
of the ferrule ||, thereby clearing the tube In
of all metallic material and leaving a gap in the
circuit the length of the tube l0 which is too
charactelt or another.
In Fig.t 10 is shown my fuse device in which _
the tubular element II] is provided with open
ings l?rc, as above mentioned, thereby leaving
the fuse 28 open to exterior conditions. As
shown the fuse has been melted by outside heat
as from a flame, not shown, and the sealing plug
l3 has been driven from its seat in the element
II and has struck the trigger 46’ which retained
an arm 5| in the dotted position 5|’. The arm
5| is mounted on a shaft 52 which is adapted to
turn in a clockwise direction, when the arm 5|
is released, by reason of the weight 53 which is
suspended by a cable 54 which is attached to the
much for the current to jump or are thereby
effecting a certain and positive break in the cir
cult.
There are circumstances where the overload
on the conductors 43 and 44 is brought on
gradually and the violent destruction or blowing
of the fuse as above described does not occur,
instead, the overload slowly increases and the
wires 26 and 21 gradually heat and-eventually
reach a‘ point where the tension of the spring l1
pulls the wires 26 and 21 apart,‘whereupon the
impact of the rod IS on the plug |3 instantly
takes place and the plug I3 and attached parts
sector 55 which is rigidly attached to the shaft 52. .
On the shaft 52 is a series of arms 56, 51, and
58 all of which are rigidly mounted on the shaft.
At 159 is a link connecting between the arm 56
and an electric switch 51 and is adapted to close 20'
the switch to complete a circuit upon the rotation
of the shaft 52.
At 6|] is a shaft having a crank 6| on which is a
connecting rod 62. On the shaft 60 is rigidly
mounted an element 63 having a stop notch 64.
are driven out of the tube In leaving a gap the
length of the tube Ill in the circuit as previously
described.
In Figs. 2, 5 and 8 are shown the plunger type
The shaft 6|] is adapted to be rotated by any
source of power, as illustrated, the source of
power is a cable 65 wrapped around the shaft 60
and on one end of the cable is a weight 66. At
61 is a stop bar adapted to catch under the 30
notch 64 and prevent the rotating of the shaft 60.
One end of the stop bar 61 is pivotally connected
of impact producing mechanism, while in Fig. '1
at 68 to the arms 51 which, when the shaft 52
is turned, draws the bar 61 from engagement
is shown a simpler form to accomplish the same
with the notch 64 thereby permitting rotation of
result. Referring to Fig. 7, is shown the tapered
plug |3a, which corresponds to the plug I3 in
Fig. 2, and rigidly attached to the plug |3a is a
metallic spring element l'lb, said spring element
I'Ib having a hook like portion 23b formed on
the top end thereof to which the “pig-tail” is
tied as previously described.
In all of the types of impact producing devices
shown, the impact is sufficient to throw the whole
impact producingdevice out of the tube l0 and
the shaft 60.
'
At 50 is a water valve having an operating
arm 69 which is connected to the arm 58 by the
link 10 and upon rotation of the shaft 52 the
valve 56‘is opened to permit the flow‘ of water ‘I |. 40
The above description of these three opera~
tions is only illustrative of a train of operations
leave it free of any metallic material, this oper
ation will occur even though the tube l0 may
occupy an inclined or even an inverted position.
Inasmuch as the impact producing mechanism
is expelled from the tube ID with such force as
above described, the‘device becomes still more
50 useful. It may enter the field of setting off
alarms, or other trains of action such as illus
trated in Fig. 9 in which the fuse has been
that can take place as a result of the failure of
the fuse 28.
'
'
It will be understood that all such modi?ca
45
tions of my improved fuse device’ as have been
mentioned above as well as those which lie with
in the scope of the appended claims may be em
ployed without departing from the spirit and
50
intention of my invention.
Now having fully described my invention, what
I now claim and desire to secure by Letters Patent
1s:
1. In an electrical fuse device, a non—conduct
blown and the impact producing device has been ing enclosure, contact elements on the ends of 55
driven from the tube l0 and the plug l3 strikes said enclosure, a fuse element, means in one of
55 the handle or blade 46 of a switch driving the said contact elements to hold said fuse element
blade 46 to contact the element 41 to complete on the central axis of the said enclosure, means
a circuit between the conductors '48 and '49 to in the other contact element to receive a-sealing
operate signals, relays or other desired devices. plug, a spring actuated impacting device on said 60
The element 46 might be a. trigger which when sealing plug and means for attaching said fuse
60 struck by the plug i3 would release a circuit
element to said impacting device so that‘ the
tension of the spring in the impacting device will
breaker thereby opening all phases of a poly
phase circuit; or the element 46 might be a hold the fuse element under tension and hold the
trigger which when struck by the plug l3 would sealing plug in position in the contact element 65
release a train of mechanical actions or the like. for the purpose described.
65 The characteristics of my fuse device are such
2. In an electrical fuse device, a non-conduct
I
be employed in ?elds other
t that the device may
than electrical, for instance, the walls of one end
of the tube might be left open as at like so that
external flames of ?re or heat would melt the
70
‘ fusible link 28 and
75
release the impact producing
device and the plug |3 would strike a ?re alarm
switch such as illustrated in Fig. 9 and close the
switch and thereby send out a ?re alarm; or the
plug l3 might strike a trigger 46 or 46' in Fig. 10
.
.
\
.
mg enclosure, ‘ contact elements on either end
thereof, said contact elements being joined to
gether by the combination of a fusible element 70
and an impact producing device, said fusible ele
ment and impact producing device being con
tained in said enclosure, said impact producing
device comprising a plug which fits snugly. in one
of said contact elements to form a comparatively 75
4
2,134,523
weather-proof joint between said plug and con
tact element, a tubular element rigidly attached
to said plug and having a slot in the side of said
tube, a rod slidable in said tube and a spring con
neoted between said tube and rod for causing
said rod to strike said plug and drive the plug out
of its socket in the contact element, a pin on said
rod, said pin passing through said slot and adapt
ed to slide up and down therein, and a ?exible
10
connection between said pin and said tubular
element, means on the upper end of said rod for
connecting a fuse element thereto, means for ten
5. In an electrical fuse device, an insulation
enclosure, contact elements on the enclosure. a
fuse element, means associated with one of said
contact elements to hold said fuse element in
spaced relation with said enclosure, a trigger re
leasing member associated with the other contact
element, an impact member on said trigger re
leasing member, spring means for biasing said
impact member towards said trigger releasing
member and means for attaching said fuse ele
ment to said impact member so that said spring
means will normally hold the fuse element under
15
and rupture of said fuse element the said rod
will be released and caused to strike the said plug
by reason of the spring action and drive the plug
and its associated parts from its socket and clear
20 the enclosure of all metallic material, substan
tially as described and for the purpose set forth.
3. In a fuse device, an elongated housing hav
ing openings therein intermediate its ends, a
fuse element in said housing, said fuse element
25 being exposed to the exterior of said housing
through said openings, means in one end of said
housing for the support of
a spring actuated impacting
site end of said housing secured to one end of
30 said fuse element and normally held in operative
position thereby, said spring actuated impacting
device being driven from the housing upon the
rupture of said fuse element.
4. In an electrical fuse device, a non~conduct
ing housing, an electrical ,contact element on each
the latter upon destruction of the fuse element.
6. In an electrical fuse device, an insulating
enclosure, contact elements in spaced relation on
the enclosure, a fuse element, means associated IO
with one of the contact elements to hold said fuse
element in spaced relation within said enclosure,
means on the other contact element to receive a
sealing plug, a spring actuated impacting device
associated with said sealing plug, and means for
attaching said fuse element to vsaid impacting de
vice so that the spring of the impacting device
will normally hold the fuse element under tension
and hold the sealing plug in position in the en
closure, said spring being effective to cause actu 30
ation of the impacting device when the fuse is
disrupted.
7. In an electrical fuse device, a tubular en
closure of insulating material, a contact element
end of said housing, a fuse element and a spring
adjacent each end of the enclosure, a fusible ele
actuated impacting device in said housing, a clo
sure member carried by said impacting device for
ment within said enclosure, means for securing
sealing one end of said housing, said fuse ‘ele
one end of said fusible element to one of said con
tact elements, a closure member adapted to nor,
mally engage said other contact element, a spring
actuated impacting device carried by said clo
sure member and extending into said tubular en 44)
closure and means for attaching the other end
of said fusible element to said impacting device
ated impacting
member and be
housing.
so that the tension of the spring in said impacting
device will hold the fusible element under tension
and hold said closure member in position with
respect to said other contact element.
JUNE L. LEHNHERR.
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