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Патент USA US2135788

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Nov. 8, 1938'.
CT. BlRKENMAlER
o
FUSE
Filed Dec. 24/ 1957
"3/NI"Hg.
é?
2,135,788
2 Sheets-Sheet 2
Patented Nov. 8,1938
2,135,788
' UNITED‘ STATES PATENT OFFICE _
2,135,?“
FUSE
Theodore Birkenmaier, St. Louis, Mo., assignor to
W. N. Matthews Corporation, St. Louis, Mo., a
corporation of Missouri
Application December 24, 1937, Serial No. 181,585 '
8 Claims. (Cl. 200-114)
This invention relates to fuses, and with re
there is ‘shown at numeral l a fuse box_ having
gard to certain more speci?c features, to expul
an open bottom 2. The box includes a septum
sion fuses. . '
8i notched at 83 for accommodating a tube 29
The invention is an improvement upon the to be described. The box also has a pivot pin 3
5 structure shown‘ in my Patent No. 2,077,207 for for the hook-shaped portion 5 of a door ‘I, the 5
Fuse, dated April13, 1937.
'
.
latter carrying’ an eye '9 for manipulating the
Among'the several objects of the invention same to open and closed positions. In open
may be noted the provision of a fuse such as
shown in said patent wherein an inside, instead
10 of an outside tube slides downwardly to effect
the operation; the provision of apparatus of the
class described which permits the advantages of
- the construction shown in said patent to be used
15
in connection with the so-calied knife contacts,
as well as with the latch-type ofcontacts shown
in said patent; the provision of apparatus of this
class which is adapted to drop the fuse lirik after
withdrawing the same from the expulsion tube;
‘and. the provision of apparatus of the class in
20 which a door shall remain in place more effec
tively. Other objects will be in part obvious and
'
in part pointed out hereinafter.
'
‘The invention accordingly comprises the ele
ments and combinations of elements, features of
25 construction, and arrangements of parts which
position, the door may be entirely separated from -
the box by unhooking the hook from the pivot
pin 3. In closed position, the pin 3 and the 10
hook are inseparable. The box I and the door
1 are composed of insulating material, such as
porcelain and “Bakelite" respectively.
_
The door of the present box is improved over
that shown in said patent by providing later- 15
ally extending lugs II which swing down, into ’
position below the extensions l3 of the box when
the door isrswung down (see Fig. 4). Thus, if
while depending, a iineman’s tool or the like
strikes the door and tends to force it upwardly, 20
it cannot be pushed up high enough to unlatch.
However, it may be unlatched when ator near
the dotted-line position B as shown in Fig. 1.
It cannot be unlatched when in the dotted line
position A shown in Fig. 4. Neither can it be 25
will be exemplified in the structures hereinafter 1 unlatched in the solid-line position shown either
,
3
described, and the scope of the application of in Figures 1 or 4.
which will be indicated in the following vclaims.
0n the door 1 is an upper support Hand a
In the accompanying drawings in which is ‘lower support l‘l, these being respectively in30 illustrated one ‘of various possible embodiments tegrally associated with terminal engaging eieof the invention—_
ments l9 and 2|. These terminal engaging'ele
Fig. 1 is a vertical section of a fuse box in
ments have ?at sides for engagement with the
corporating the invention; J
?at sides of spring line terminals 23 and 25,
r Fig. 2 is a front elevation of Fig. 1; .
the latter being held fastened to the box I. These
Fig. 3 is a bottom plan view of Fig. 1;
line terminals 23 ‘and 25 have wire-receiving
Fig._ 4 is a view similar to Fig. 1 showing an clamping yokes 2'! for the usual wire-holding
alternative relationship of parts after blowing of
a fuse;
‘
From the above it will be “seen. that the con
Fig. 51s a fragmentary rear elevation of a tact between the terminal engagingeiements l9
clamping mechanism; and,
.
and 2| and the line terminals 23 and 25.are of
_
Fig. 6 is a bottom view of the parts shown the, so-called knife-contact variety which ‘ordi
in.Fig.5._
.
w
'
narily would substantially resist any vertical mo
Similar reference vcharacters indicate corre
tion and which consequently would resist the
sponding parts throughout the several views of easy sliding down of theoutside tube such as
purposes.
45' the drawings.
_
,
,
.
tween sideward spring clips. The solution of the
problem of the application of said structure to
such contacts is, among other ,things, herein
given.
‘
43 of Patent 2,077,207.
In some instances, it is desirable that the struc
ture disclosed in my Patent 2,077,207,‘ be used
in connection with so-called-knife contacts; that
is, with contacts in which the termina1-engag-.
50‘ ing portions on the fuse are springingly held be '
'
_
.
55 .Referring now more particularly to Fig. '1,
.
-
'
l
-
'_
.
.
30.
35
-
-
40
.
In order thatI may use the sliding tube ar
rangement of said patent, the terminal engaging
elements I! and 2| are joined'by means of an
outer insulating tube 2! or its equivalent. The
tube ll is'threaded into'the upper terminal en-‘ 50
gaging element ",andis held to the lower en
gaging element 2| by means of a set screw or
the like.
‘
I
The upper terminal engaging element IS in
cludes an opening 3| through which may be in- 56
2,135,788
serted, ?rst the ?exible lower length 33 of a
fuse iink and then a fusible portion 35 and an
upper flexible portion 31. The opening 3| will
not admit the attached head as. The head as
is clamped by means of a cap 4|.
_
rI'he fuse link, which I will hereinafter desig
nate in general by the letter F is positioned with
in an inner insulating tube 43. This tube at its
upper [end slidably ?ts into a socket 45 in the
terminal engaging element I9. The tube 43
passes downwardly through the outer. tube. 29
and extends a slight distance from the lower end
thereof. At its lower end it is provided with a
sideward notch 47 throughout which laterally
15 passes the lower end of the fuse link F.
An outside ring 48 fastened on the inner tube
43 is adapted to drop down and rest upon an
inner ring 5| fastened to the inside of the fixed .
outer tube 29. Thus the inner tube has a limited
downward motion such as illustrated in Fig. 4.
This tube is free of any contact with the line ter
minals 23 or 25, and consequently there is no
friction therewith.
To hold the lower end of the fuse link F, there
as
is provided on. the lower terminal engaging ele
ment 2! a rearward conducting clevis 53. Pivoted
to this clevis~53 is a downwardly extending arm
55 of conducting material which passes through
ring 49 rests on ring 5|, as shown in Fig. 4. The 10
tube 43 extending from box I then functions as a
telltale. The tube 43 acts as a telltale to show
that the fuse is blown, even though no fuse link
is hanging therefrom. Thus not only is the in
vention of my former Patent 2,077,207 made ap 15
plicable to knife contact switch structures but at
the same time, I effect the advantage of having
the major parts of thefuse link drop from the
apparatus after it is melted, thus avoiding short
20
circuiting with adjacent wires.
To reload the device, it is only necessary to
bring the door 1 into the position B and remove
it. The fuse cartridge being thereon may then
be handled as follows:
The cap 4| is removed and a fresh fuse link fed
through the openings thus presented. The. cap
4| is then replaced to clamp the head 39. The
(Fig.4)h'
is then positioned over the ?ngers l3 and in be
i
.
The link 55 reaches downwardly to a point
whereitlin turnis formed as a clevis 59 between
35 the ?ngers of ‘which is pivoted a clamping lever
tween the clamping or holding portions 15 and 71.
The fuse link is pulled taut and the lever 55 is
thrown to the position shown in Fig. 1. Then,
6|.’ The‘lever'?l is normally forced by a spring
53in a-clockwise direction (Fig. 4).’; rI'he clock
upon release of the lever, the spring 65 tensions
wise'm'ovement is limited by the action of a pin
‘H. which extends from the link 6| and engages
It will be understood that although the door 1
is shown as being hinged to the box I, that it
may be otherwise movably supported as by per 40
mitting the line terminals 23 and 25 to support
the door assembly through the frictional engage
ment with the terminal engaging elements l9
theunders'ide of ?nger 61 of said clevis 59. '
In view‘ of 'the'iiabove it will be clear that since
the lever-55 is limited in its clockwise motion by
the-bridge?“ (Fig. 4), and the lever 6| is limited
in its ‘clockwise motion on lever 55 that the two
levers-‘assume a'ffree position such as shown in
Fig. 4 when the fuse link is not applied thereto.
a Provisionismade for applying the fuse link at
its lower -"end toisaid levers as follows:
‘The loweriendi'of the lever Si is formed with a
50 lateral-‘finger '13. (Figures 5 and 6) over which
J .' thelowerlnendiot the fusellink is placed. The
‘i ifusee link lend-ieisi then passed beneat a lateral
clamping-portion?“ on lever SI and, over a seat
" ip’ortion‘li'l'on'tthe ?nger 61 of lever 55.
I *When-the‘zf-use is placed in the position shown
in Figures 1, 3, 5 and 6, it is pulled enough so
~~z=that therer‘is-a?endency to move the lower lever
~
'
Next, the inner tube 43 slides down until the
A
spring 65 forces the arm 55 against the bridge
30 limitingthe outward swing of the link 55.
ii".
releasing the fuse link which drops away from the
box.
tube 43 at this time is again pushed up into the
position shown in Fig. l, and the lower end of the
link is brought out from the bottom of the tube 30
through the notchv 41. The lower end of the link
a bridge 51. The bridgeiconstitutes a means for
-
end of the fuse link is projected downwardly.
The fuse link which has descended from the inner
tube 43 has no longer any action on the pin 73
to make the lever 5| effective as a clamp on the
end of the fuse link; Thus the lever 6| swings
clockwise on the link 55 to open clamp 75, thus
6|:counteredlockwise (see Fig. 1).‘ This causes
its clamp.“ to clamp the fuse link F against the
60% seati‘rlflivr Further pull draws the lever 55 against
mspringtiini Hence, under the tension-of spring 65,
the levers 55 and BI as described.
and 2|.
_
.
>
In view of the above, it will be seen that the
several objects of the invention are achieved and
other advantageous results attained.
As many changes could be made in carrying
out the'above constructions without departing
from the scope of the invention, it is intended 50
that all matter contained in the above description
or shown in the accompanying drawings shall be
interpreted as illustrative and not in a limiting
sense.
,
I claim: 1
~
'
v
'
.
1. In apparatus of the class described, a base‘,
spaced line terminals thereon, a movable member
associated with the base, terminal engaging ele
ments on the movable member cooperable with
said line terminals, a fuse tube, means for slidably 60
arranging said tube with respect to said terminal
‘ ~Y;>the;levers 55¢~1and H, are maintained in clamping ‘ engaging elements, the tube being free of any en
positions__,asj.;shown in Fig. 1. Hence there is
effected automatic clamping of thelower end of
gagement with the line terminals, a fuse link
joining said terminal engaging elements and
\ Ythefuselinkinqresponse to tension in the spring ‘ passing through said slidable tube, and means
=6 >~Thent?udency is to tension the fuse link in . ".auxiliary to the tube for tensioning said fuse
thetube.;_.43, the lower end being relatively ?ex-_ ' .ilink prior to blowing vand to aid in withdrawing
jiblegtorg; in .thecase of a very heavy fuse link. at the lower portion after the link has blown.
i
“least, .tohold the link in a position to prevent the
70.: descent of .the inner tube 43.
.7 .p-When; the fuse link melts at the fusible section
. ,2. In apparatus of the class described, va base,
spaced line terminals thereon, a movablemember
associated with the base, terminal engaging ele
‘ 35, the tension in spring 65 is released so that the
lever- iiis'zpushedclockwise to effect a withdrawal
ments on the movable member cooperable with
said line terminals, a fuse tube, means for slidably
~31? >.,.;of-;.‘ the=fuse11link. The expulsion action in the
' tube 43 aids the effect andlultimately the lower
arranging said tube with respect to said terminal
engaging elements, the tube being free of any en
3
2,186,788
for limiting the descent, of the expulsion tube with
respect to said stationary member, means auxili
my to the tube for tensioning said fuse link prior
gagement with the line terminals, a fuse link
joining said terminal engaging elements and pass
ing through said slidable tube, and means aux
iliary to the tube for tensioning said fuse link
prior to blowing to aid in withdrawing the lower
portion after the link has blown, said slidable tube.
to blowing for withdrawal of the same upon blow
ing, said tensioning means being adapted subse
quently vto drop the withdrawn portioniof the link
tocompletely‘separate it from the apparatus.
being supported by the‘ fuse link while the latter
is tensioned. -'
.
3. In apparatus of the class described, a base,
10 spaced line terminals thereon, a hinged member
on the base, terminal engaging elements on the
hinged member cooperable with said line termi
nals, a fuse tube, means for slidably arranging
said tube with respect to said terminal engaging
elements, the tube being free of any engagement
with the line terminals, a fuse link Joining said
terminal engaging elements and'passing through
- said slidable tube, means auxiliary to the tube for
tensioning said fuse link prior to blowing to aid
20 in its withdrawing the lower portion after the
'
6. In apparatus of the class described, a box, a
door hinged to said box at the lower end, said
box having an opening in the bottom, line termi 10
nals of the knife-contact variety in the box,
terminal engaging elements on the door for en
gaging said line terminals, a movable tube lo
cated between said terminal engaging elements
and having’ an open bottom, a fuse link joining 15
said terminal engaging elements and passing
through said movable tube and means auxiliary
to the tube for tensioning said link prior to blow
ing to aid in withdrawing it as the fuse link
blows, said movable tube being adapted to de 20
‘ link has blown, said tensioning means being ' scend upon withdrawal of the link.
,
adapted to drop the withdrawn portion of link
'7. In apparatus of the class described, a box,
after withdrawal from said tube.
4. In apparatus of the class described, a base,
a door hinged to said box at the lower end, said
box having an opening in the bottom, line termi
25 spaced line terminals thereon, a hinged member
nals of r the knife-contact variety in the box, 25
on the base, terminal engaging elements on the terminal engaging elements on the door for en
gageme'nt with said line terminals, a movable tube
hinged member cooperable with said line termi
nals, a fuse tube, an outer stationary tubular having a bottom opening located between said
member rigidly joining said terminal engaging terminal engaging elements, a fuse link joining
said terminal engaging elements and passing
30 elements, a slidable expulsion tube within said
outer tube, a fuse link joining said‘terminal en 'through said movable tube and passing out of its
lower end, means for tensioning said link to aid in
gaging elements and passing through said ex
pulsion tube and out. of the lower end thereof, withdrawing it when the fuse- link blows, said
said fuse when in conducted position supporting ' movable tube being adapted to descend upon
said
expulsion tube and releasing said expulsion withdrawal of the link and means for limiting
35
tube when the fuse blows, means for limiting the the descent of the tube.
8. In apparatus of the class described, a box. a
descent of the expulsion tube with respect to said
stationary tube and means auxiliary to the tube door hinged to said box at the lower end, said box
for tensioning said fuse link prior to blowing for ' having an opening in the bottom, line terminals
of the knife-contact variety in the box, terminal
40 withdrawal of the same upon blowing.
5. In apparatus of the class described, a base, engaging elements on the door‘for engaging said
spaced line terminals thereon, a hinged member line terminals, a sliding tube located between
on the base, terminal engaging elements on the said terminal engaging elements, a fuse link join
ing said terminal engaging elements and passing
hinged member cooperable with said line tenni
through said slidable tube, means auxiliary to
nals,
an
outer
member
rigidly
joining
said
termi
45
nal engaging elements, a slidable expulsion tube the tube for tensioning said link to aid‘ in with
within said outer member, a fuse link joining _ drawing it when the fuse link blows, said sliding
said terminal engaging elements and passing tube being adapted to descend upon withdrawal
through said expulsion tube and out of the lower of the link, said tensioning means being adapted
to drop said link after withdrawal thereof and
end thereof, said fuse when in conducted posi
50 tion supporting said expulsion tube- and releasing means for limiting the descent of the tube.
said expulsiontube when the fuse blows, means
30
35
40.
45
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