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Патент USA US2131292

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Sept. 27, 1938.
Filed April 19, 1937
fig_ /
6 *7” PM
Patented Sept. 27, 1938
Thomas E. McDowell and William A. Wulle,
Chicago, Ill., assignors to The Pyle-National
Company, Chicago, 111., a corporation of New
Application April 19, 1937, Serial No. 137,669
1 Claim. (Cl. 200-—115.5)
The present invention relates to a fuse ejector present invention will be apparent from the fol
lowing description and accompanying drawing.
construction for fused plug.
The invention relates more particularly to ex
pulsion fuse construction and is concerned with
devices utilizing removable fuses of the cartridge
type wherein the fuses may be readily removed
and renewed without the use of tools to separate
the parts maintaining the fuses in electrically
connected relationship.
The present invention will be described in con
nection with a separable connector of the type
disclosed in Thomas E. McDowell Patent No».
2,015,953, dated October 1, 1935, although it is to
be understood that the present invention is capa
ble of use in other embodiments.
The present invention is useful in external
electrical conductors, such for example, conduc
tors utilized for operating electrically driven port~
able tools and the like, connections to the elec
trical equipment of railway trains while at rest
to supply power for the operation of air-condi
tioning apparatus, charging the train batteries,
as well as other purposes.
Electrical connectors for use in the relations
mentioned must be small and constructed to afford
no projections which catch as the conductors in
which such connectors are applied, are dragged
from place to place in service, at the same time
such connectors must be small as possible and yet
30 capable of carrying proper current, and at the
same time constructed to withstand the severe
and rough treatment received in normal use.
An object of the present invention is to pro
vide a fused plug in which the fuse means may
35 be readily removed and replaced in minimum time
and without the use of tools.
Another object of the present invention is to
provide a fused plug in which the insulating
means carrying the conductor elements and fuse
40 comprises two separable parts each recessed to
provide, when together, pockets for the fuses, and
in one of which parts the fuses are frictionally
gripped for preventing accidental displacement of
the fuses as the members are connected or sep
The accompanying drawing illustrates a fused
plug constructed in accordance with the princi
ples of the present invention, and the views there
of are as follows:
Figure 1 is a view, partially in elevation and
partially in central vertical section along line
Iwl of Figure 2, through a fused plug which con
stitutes one part of a separable electrical con
Figure 2 is an end view of the plug of Figure 1,
the right-hand end of the same.
Figure 3 is
end elevational view of the inner
or rear end of the insulating body.
Figure 4 is a ‘view, partially in elevation and par
tially in central vertical section, showing one of
the insulating members moved away from the
other by the action of one form of fuse expulsion
means of the present invention, when the means
for holding the two members together are re
Figure 5 is an elevational view of one of the
insulating members carrying pin contacts, and
showing the same with fuses carried thereby, and 25
the screws, for securing the two members to
gether, withdrawn.
Figure 6 is an isometric View of one of the fuse
contact members utilized in the recesses or pock~
ets of the insulating members of the plug.
Figure '7 is a fragmental sectional view of a
portion of an insulating body showing a portion
of a cartridge fuse and another form of expulsion
means for ejecting the fuse.
The drawing Will now be explained.
The plug shown in Figure 1 includes an insu
lating body comprising two members I and 2
which are adapted to be connected together for
establishing electrical circuit relationship,through
enclosed removable fuses.
Members I and 2 are cylindrical, and are con
nected together by means of screws or bolts 3, 4,
and 5, carried by the one member 2. The one
member 2 is provided with axially extending aper
tures E for the bolts, which apertures are equally
arated, while the other of the members is pro
vided with means for automatically displacing or
ejecting the fuses from the recesses in this mem
spaced, circumferentially, within the cylindrical
ber and to move the said one member away from
the other member when the holding means are
same are threaded into the other member I. In
order to receive the screws in threaded engage
released, thereby making it unnecessary to use
a tool to separate the members or to withdraw
the fuses from said other member of the insu
lating means of the plug.
ment the other member I is provided with thread
ed bushings 8, as may be readily observed in
Figure l.
The member I is provided with conductors 9
passing from the inner end of the member, which 55
The above other and further objects of the
surface of the member. The member is recessed
at ‘l to receive the heads of the screws when the
is the left-hand end as viewed in Figure 1, and
terminating within recesses or pockets l0 formed
in the member. Bottomed in the recesses or
pockets l6 are contact-making cups II which are
electrically connected to the conductors 9. The
outer ends of the conductors 9 are provided with
clips 52 and binding screws l3 for connecting
conductor wires to the several conductors 9. In
the invention as herein illustrated, there are three
of such conductors 9, constituting three poles of
the plug, while the fourth pole constitutes an
elongated conductor element M which passes
through the member from end to end, and is
prevented from rotation in said member by means
15 of a polygonally shaped integral portion l5 which
engages a correspondingly shaped recess in the
front face of the member. The rear end of this
conductor M is provided with a clip l6 and a
binding screw ill.
Thus the illustrated plug is
arranged as a four~pole plug.
The three poles of the plug, which are elec
trically connected with the several conductors
9, are protected by removable fuses A, applied as
The insulating member 2 is provided with re
cesses or pockets 53, with the same number and
axial arrangement as the pockets or recesses H!
in the member l. Within a pocket 18 is a cup
shaped contact member l9 to which is connected
a pin connector 20, the connector 20 being sol
dered or otherwise secured to the cup IS, the
cup and pin connection 2i! being applied in the
member 2 by inserting the same through the open
fuses, as soon as the outer member 2 is sepa
rated from the inner member I.
The means illustrated in Figures 1 and 4 for
accomplishing this purpose, comprises a coiled
spring 24 inserted in a cup or stationary fuse
clip I I of the member I. There are, of course,
as many of the springs 24 employed as there are
cups II in the member I. Preferably the springs
are of substantially conical shape in elevation,
with their bases soldered or otherwise secured 10
to the bases of the cups to prevent loss of the
springs, while the insulating member 2 is sepa
rated from the insulating member I. It is to
be understood, of course, that other types of
springs or equivalent resilient means may be uti
lized in lieu of the coiled springs illustrated. The
springs 24 are placed under compression, when
the member 2 is connected to the member I, to
connect the fuses A in circuit connecting rela
tionship between the conductors 9 and the pin
contacts 20 and remain under compression as
long as these members are connected. When~
ever a fuse blows, all that the workman or oper
ator has to do is to release the screws 3, l3‘, and
5 from threaded engagement with the insulating
member !, whereupon the springs 24 become ef
fective to shift or eject the fuses, from the posi
tion shown in Figure 1, to the position shown in
Figure 4, moving with the fuses the outer insu
lating member 2, thus loosening it, so that the 3O
operator or workman may remove the member 2
by grasping one of the pins 20 with his fingers
and separating the member 2 so that the blown
end of a recess it, the outer end of the member
fuse or fuses may be replaced. When the blown
2 being suitably apertured as at 2! for the pin
connectors 29. The cup-shaped contact mem
ber is, one of which is illustrated in Figure 6,
is so constructed as to frictionally grip and hold
fuses have been replaced the member 2 with the 35
fuses therein is applied to the member l, and the
two members fastened together in operative rela
tion, by the screws 3, 4, and 5, as shown in Fig
one end of an inserted fuse A.
ure 1.
The fuses A of
40 known form, are provided with metallic end
members 22 and 23 for making the electrical con
nection with the cups l9 and ll respectively.
Fused plugs, of the general character herein
described, have been in use. However, it has
been demonstrated by experience that the fused
plugs of the present type of manufacture, when
it is necessary to renew the blown fuses, offer
resistance to ready fuse renewal.
Where such fuses have been inserted in fused
plugs between. cups in the inner member I, and
other cups in the outer member 2, oftentimes the
cups engage the fuses with such frictional force
as to prevent removal of the outer member 2
by a pulling pressure applied by hand to one of
the pin contacts ‘All. In such event the work
man, has employed pliers to pull the member 2,
which is disadvantageous, as the pliers damage
the engaged pin contact 26. Even when the
workman is successful in pulling out the outer
insulating member 2, by means of pliers or other
tool applied to one of the pin contacts 20, some
times the fuses have remained frictionally held
in the inner member I.
When this occurs a
workman attempts by means of pliers or other
65 tool to pull out the fuses. To accomplish fuse re
newal, in the manner just described, requires
‘much more time than is warranted and necessi
tating shutting down a connected electrical tool
or machine beyond a desired amount, and at the
same time damaging some of the vital parts of
the connector.
The present invention overcomes the above
recited objections by providing expulsion means
within the pockets or recesses ll] of the inner
member I, to automatically free or expel the
The fused plug herein illustrated includes a 40
casing or housing 25 which receives a portion of
the inner or rear end of the member I, when the
parts are assembled. The housing 25 has an in~
tegral neck 26, which is hollow and through
which the conductor wires are passed for con
nection to the conductors 9 and M. A strain-re
lief ?tting, designated generally at 21, is provided
for purpose well understood.
Surrounding the housing 25 is a sleeve 28
which extends beyond the extremities of the pin 50
contacts 20 and the contact 14. The sleeve is
mounted on the housing 25 for limited rotative
movement for use in disconnecting the plug
member from a mating receptacle, such as that
appearing in Thomas E. McDowell Patent
2,015,953. The sleeve 28 is provided with elon
gated, circumferentially extending slots 29 and
30, through which pass screws 3! and 32 respec
tively for preventing separation of the sleeve
from the housing. One or both of the screws 3! 60
and 32, or a third one, if necessary, may extend
into and engage suitable recesses in the inner
insulating member I for maintaining the insu
lating members I and 2 ?xed in the housing 25.
While the invention has been described herein
in connection with a plug member of a separable
connector such as that shown in Thomas E.
McDowell Patent 2,015,953, nevertheless the in
vention may be incorporated in other forms of
electrical connectors.
The invention, however, 70
?nds ready use in connection with the form of plug
described, for the reason that the plug is of mini
mum diameter to reduce its weight and size, for
the current carried by the conductors. Thus the
limitation of size is an item to be regarded in con
nection with the present invention. It may be
readily observed that the space offered by the open
end of the sleeve 28 is limited so that it would
be far from easy to insert a pair of pliers to grasp
one of the pin contacts to separate the insulating
member 2 from the insulating member I, were the
fuses gripped by the cups I I of the member I, thus
offering material resistance to separation of the
members. By means of the present invention, as
soon as the bolts or screws 3, 4, and 5 are released
from threaded engagement with the member I,
the springs 24 immediately eject the fuses A from
the cups II to such an extent, as to separate the
member 2 from the member I, whereupon it is easy
15 to withdraw the member 2 from within the sleeve
28 and replace the blown fuses with others.
The provision of the contact member l4 which
serves as a safety ground circuit and can not be
fused because of code requirements also serves to
guide the two parts, when pushed together, to
maintain the polarity of the pin contacts after the
member 2 has been separated from the member I,
and the former is returnedto again e?ect electri
cal connection through the plug.
Figure 3 illustrates the rear end of the member
I of the insulating body where it may be observed
that the heads of the several conductors are sepa
rated one from another by means of partitions 33,
formed as integral parts of the member I, so that
30 there is no likelihood of short circuits occurring
between any of the contacts of the plug members.
Referring to Figure 6, it will be observed that
the cups, of which this is an example, are formed
with bases 34 and spaced side walls 35, 36 which
35 are curvilinear in plan, and which are connected
to the bases 34 by necks 31 of reduced circum
ferential extent. The side portions 35 and 36 are
formed with legs 38 which extend toward the
bases 34, and which may be slightly bent, prior to
application of the cups to the pockets or recesses,
to frictionally hold the cups in place in the pockets
or recesses and at the same time engage the me
tallic ends 22 of the fuses with su?icient frictional
clamping engagement to normally retain the fuses
in the member A, against accidental displacement.
The fuse ejector of the present invention may be
used with any sort of an insulating body, with or
without an enclosing sleeve, such as the sleeve 28,
as the two members I and 2, comprising the insu
50 lating body, may be constructed as herein de
scribed and the springs 24, or equivalent means,
employed to eject or free similar ends of the fuses,
when the members are separated for fuse replace
In order to prevent accidental loss of the screws
3, 4, and 5, from the member 2, by falling out, due
to gravity, when the latter is removed from en
gagement with the member, the outer ends of the
aperture 6 may be threaded; and the apertures in
60 wardly of the threads may be slightly enlarged,
thus permitting lengthwise movement of the
the clip constituting the contact member follow
ing the fuse out of its pocket or cavity in, the in
sulating member I.
Referring to Figure 7, a spring 4I is secured to
one end, by soldering or otherwise, to the inner
end of a conductor terminal 42, that is, the end of
the terminal making contact within a pocket or
cavity ID. Secured to the free end of the spring
4 I, as by soldering or the like, is a shallow clip or
cup 43, which receives one end of a cartridge fuse 10
A in circuit making relation.
When this type of ejector is used, the springs M
are compressed when the members I and 2 are
connected together by the screws, and remain un
der compression so long as members I and 2 are 15
connected. When a fuse has to be removed, the
springs free or expel the fuses A from the pockets
or cavities I0 and at the same time displacing the
outer insulating member 2 to the position shown
in Figure 4, so that the member 2 and its carried 20
fuses may be readily removed from the casing 28.
During such expulsion of the fuses A by springs
operating under the principle described, the clips
or cups 43-—the contact members—follow the fuses
to the limit of spring travel.
The showing of Figure '7 is not one of limitation,
but is exemplary of another form of expulsion
means. Spring or other shapes and kind may be
substituted for the one speci?cally illustrated, so
long as the principle of operation is retained, viz., 30
causing the clip, or any equivalent contact mem
ber to follow the fuse, when expelled by the spring,
to the limit of spring travel.
The invention has been described herein more
or less precisely as to details, yet it is to be un 35
derstood that the invention is not to be limited
thereby, as changes may be made in the arrange~
ment and proportion of parts, and equivalents
may be substituted, without departing from the
spirit and scope of the invention.
The invention is claimed as follows:
An electrical connector of the class described
comprising a shell having an open end to receive
a mating connector; an insulating pin carrying
body within said shell enterable through said open 45
end and bottomed within said shell with its outer
most face spaced inwardly of said open end; said
body comprising two members connected together
with adjacent end faces in contact and at right
angles to the casing axis; screw means available
through said open end for securing said two mem—
bers together within said casing; male contact
pins projecting outwardly of the outermost face
of said body with the pin extremities terminating
inwardly of the plane of said open end; said body 55
members being counterbored through their ad
jacent faces to provide cartridge fuse pockets;
contact cups bottomed in said pockets and con
nected in circuit relation; and repellant springs in
the cups of the inner body member arranged to 60
connect the fuses in circuit relation and possess
screws within the aperture and preventing re
moval of the screws unless unscrewed through the
threaded ends 40 of the apertures.
The principle involved in the operation of the
ejector shown in Figures 1 and 4, covers a station
ary fuse clip, such as a cup I I, and an independent
spring, such as a spring 24, for ejecting a fuse.
ing sufficient strength to automatically push the
Another principle of operation is involved in the
arrangement shown in Figure '7, i. e., utilizing a
70 movable clip secured to the free end of a spring,
in the cups of said outer member.
fuses endwise out of the said cups and therewith
move the outer body member axially of the shell
when said screw means are relieved, thereby free
ing the fuses from the cups of the inner member
and enabling ready removal of the outer body
member by digital prehension with the fuses still
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