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Патент USA US2107820

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Feb. s, 193s.
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Filed Apr‘il 3, 193e
2 sheets-sheet 1
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Feb. 8, 1938.
Filed April 3, 1956
2 Shee’cs--SheeiI 2
Patented Fe'b. s, 193s
_ Joseph E. Farrell, Washington, D. C., assigner to '
Automotive Devices Corporation, Washington,
D. C., a corporation ci“ Delaware
.duplication April 3, 1936, Serial No. 72,636
8 Claims. (Cl. 20G-88)
The present invention relates to a device which described, illustrated in the accompanying draw
will automatically function upon thevoccurrence ings and» defined in the appended claims.
of a short or overload in an electric service line to
' A prefered and practical embodiment of the ln
protect electric devices connected'in the circuit
vention is shown in the accompanying drawings,
against damage.
in Which:--
A primary object of the invention is to provide
novel improvements in a device of the electro
magnetic type wherein an electro-magnet becomes
energized upon occurence of the unusual condition
l0 in the line thereby automatically and-instantane
ously to release means for opening and breaking
the circuit.
nother object of the invention is to provide an
electro-magnetic circuit breaker which includes a
l5 fusible link set to operate at higherx amperage than
that at which the electro-magnet will function,
and therefore the lint; ‘will only melt under un»
usual load. For example it the electro~magnet
will function at lil amperee, the fuse selected will
20 not blow unless the load reaches or exceeds l5
amperes. 'in actuai practice, however, it has been
found that the electrmmagnetic means ralways
functions so quickly that the fuse seldom if ever
is called into play, but nevertheless, it is provided
25 as an added or emergency safeguard. According
ly, the invention provides a combined electro
magnetic and fusible
type circuit protector
wherein the fusible link provides an additional
factor of safety and will only become ruptured or
3o broken in the event that extraordinary condi
tions occur in the line.
- A further object of the invention is to provide
a screw-plug type construction adapted to ñt in
any screw shell receptacle and which has a mini*
35 mum length along its axis thereby permitting of
its use in any standard fuse box,l fuse panel or
other equipment without adjustment or modiñca-tion thereof.
A still further object of the invention is to pro
40 vide a novel cover for housing a spring tensioned
disk or switch block, said cover having ratchet ele
ments cooperating with spring brush terminals
which function as pawls, said ratchet elements be
ing a part of insulation barriers adapted to be in
45 terposed between the brush terminal elements and
the contacts of the switch block sothat ineventA
the undesirable condition persists in the line, no
damage or further shorting will occur after the
50 device has ronce functioned.
With the vabove and other objects in View, which
Figure l is a side elevation of the improved de
Figure 2 is atop plan view thereof.
Figure 3 is «a vertical cross-sectional view.
llf‘igure e is a horizontal cross section taken on 10
athe line fi--B of Figure 3.
Figure 5 is a top plan view of the plug base.
Figure 6 is a bottom plan view of the cap.
Figure 'l is a diagrammatic view showing the po
sition oi’ the disk-like switch block and barrier l5
walls carried by the cover when the device is set
in the .“on” position.
Figure 3 is a view similar to Figure 'i snowing
the relative position of parte when the current is
Figure 9 is a side elevation ot the cover showing
more clearly. how the barrier walls are out away to
limit the movement of the disk relative to the
Figure lo is a perspective View of the disk or 25
switch block.
Similar reference characters indicate corre
spending parts throughout the several figures' of
the drawings.
According to the embodiment shown in the 3o
drawings the invention includes in its organization
a plug body or base A and a cap structure desig
nated generally as B. Theplug body and the cap
may each be completed before assembly so that
the mere placing of them together brings them 35
into operative relationship. Any suitable means
may be employed for holding the cap and base tc
gether, such for example, as the ring C or its
Referring to the body or plug base A it may be 40
pointed out that the lower portion is surrounded
by an external metallic screw shell connector I,
while the interior thereof houses an electro-mag
net 2. The outer end of the core 3 of the magnet
constitutes the center connector 4 of the device. 45
while the upper end is exposed in the bottom of a.
recess formed inthe upper part of the base. The
winding of the electro-magnet has one end 2l con
nected tothe core while the end 2b is connected to
an upstanding spring brush terminal 5, also 50
housed within the recess formed in the base. An
will more readily appear as the nature of theA in- . ' other spring brush terminal 6 is located in the re
vention is better understood, the same consists in
the novel features of construction, combination
55 and arrangement-of parts hereinafter more fully
cessed base opposite the contact 5 and is electrical
ly connected as vat 6° with the screw shell l. The
spring brush terminals 5 and G are preferably 55
made of spring conducting material and are each
formed at their free ends with an inwardly offset
contact portion a which also functions as a pawl
as will later appear.
Between the contacts 5 and 6, and within the
recessed upper portion of the base A there is also
provided a spring-biased >armature 1. 'I'his ar
mature is preferably in the form of a plate piv
'otally supported at 8 and normally thrust away
10 from the upper end of the core of the electro
magnet by a spring 9. The forward or front end
of the armature member 1 is provided with an
upstanding detent or lug I0.
The inner side of the cover II is preferably
formed with a central post I5 and is also provided
with the pendant barrier members or walls I6
and I1. As will be observed from Figures 3 and
4 these walls are located inwardly of the inner
'periphery of the flange or. skirt II‘ thereby to
designations “On” and “Oli” which will succes
sively appear beneath the window I8. >The fuse
link or conductor 2I may be observed through the
window I4.
In the normal service condition of the parts
the armature 1 is urged upwardly by the spring
9, so that the lug I8 thereof isy in engagement
with one of the lugs, 25, for example, on the
bottom of the disk 28 thereby placing the spring
under tension The cover II is, prevented from
retrograde or backward movement by the ends b
of the terminal brushes engaging with the
ratchet shoulders |61’ and I1b, of the barrier walls
I6 and I1 respectively. _ (See Figure 7.) Thus
the contacts I8 and I9 of the disk or switch block
are maintained in_engagement with the portions
a. of the spring brush terminals l and 6. With
the parts in this condition the circuit .may be
maintained in the line through the center con
standing spring brush terminals 5 and 6. Also
tact I; the winding of the electro-magnet; brush 20
terminal 5; contact I_8; fuse 8|; Contact I9; and
these walls are tapered or beveled at their front
or toe ends as indicated in I6“ and I1“, while the
rear ends or heels ISb and I1b respectively are
brush terminal 6 to the screw shell I.
Upon the occurrence of a short or overload in
20 provide a space or channel for receiving the up
the line, the switch is tripped in the following
squared or shouldered to provide in effect, ratch
wayz-The electro-magnet becomes energized 25
et abutments to cooperate with the ends b of ` and attracts the armature type latch 1 against
the spring brush terminals as will presently ap
the tension of the spring 8 thereby drawing de
tent Ili of the latch out of engagement with the
The barrier walls I 6 and I1 are also spaced lug 25 of the switch or contact disk with which
30 apart to provide a gap therebetween to permit
it has been engaged. Immediately upon Ill and 30
of the offset portions a of the spring brush ter
25 being separated, the tensioned spring will
minals 5 and 6 engaging with the contacts I8 cause switch disk 20 to move forward and take
and I9 carried by an insulating disk or switch contacts I8 and I9 away from the free ends of
block 28. 'I‘he contacts I8 and I9y are connected the springs constituting the line terminals 5 and
35 or bridged by a fuse link 2I embedded in a '6, placing them behind the insulating barrier
suitable grcove'or channel in the face of the walls I6 and I1. Simultaneously,the radial arm
said disk lying adjacent the inside face of the - or projection 21 on the switch disk leaves the
shoulder 28 on the insulating wall I1 and moves
The disk or switch block 20 is preferably
toward the shoulder 29 of the wall I8 (Figures 'I
40 chambered at one side as indicated at 2I to fit
over the post I5, the diameter of ‘the chamber
and 8). The effect of 21 striking shoulder 29 is
2| being sufficient to house and conceal a coil
spring 22, one end of which is anchored in the
post I5 of the cover, while the opposite end is
anchored to the ydisk within the chamber 2l.
Prior to assembling the disk 28 on the post it is
preferred to place a sheath 23 of mica or its
equivalent between the ‘disk or switch block and
the inside face of the cover, said sheath serving
60 as a transparent window for the openings I3 and
I4 in the cover. For the, purpose of holding the
disk or Contact block 20 to the cover any suitable.
detachable fastening may be used such, for ex
ample, as the screw 24. ' Thus, the disk or con
tact block may be readily renewed if desired.
The disk or block 20 is, of course, made of in
sulating material and snugly ñts within the an
nuiar space provided between the curved barrier
walls I6 and I1. Therefore, the disk is not only
supported for arcuate or oscillatory movement
relative to the cover by the screw 24, but is also
guided in its movement by the walls I6 and I1.
The lower face of the disk 20 _is provided with
diametrically disposed offset lugs 25 and 26 and
65 is also.provided with a laterally or radially cif
set arm 21 adapted to move betweenshoulders
28 and 29 formed by cutting away the bottom
edges or' the walls I6 and I1, thus hunting the
relative movement between the disk and the cover
70 under the tension of the spring 22.
When the device is assembled as shown in Fig
' ure 3 it is ready for insertion into any screw shell
receptacle. The face of the disk lying next to
the cap, and shielded b‘y the mica disk 23, is
75 ._ preferably provided at spaced points with mi?,
to push or move the cover I I forward so that the
ultimate position of parts after the electro-mag
net has functioned is that shown in Figure 8.
That is to say, when the radial arm or projec
tion 21 of the switch disk strikes the shoulder 29
it will move the entire cover carrying the insulat
ing walls I 8 and I1 so that the bevelled toe por
tions of the walls will press -the free ends of ter
minal springs 5 and 6 outwardly, thereby to be
ready for the next snap engagement of the 50
springs with the contacts I8 and I9 upon the re
setting of the device.
As will be apparent by comparison of Figures 'I
and 8, the lug 25 on the exposed face of the
switch disk movessubstantialiy from the position 55
shown in Figure ’I to that shown in Figure 8
when the electro-magnet causes the release of
parts III and 25. Therefore, the lug 26 will be
the next lug to engage the detent I8 of thear
Ymature type latch 1.
Assuming that the device has been tripped, that
is it has functioned-to break the circuit by the ac
tion of the electro-magnet pulling the armature
type latch 1 downwardly so that detent I8 moves
_ out of the path of lug 25, it will, of course, be un 65
derstood that if the short or other condition in
the line has been removed, the device may then
be reset by rotating the cover II. In resetting,
the initial movement of 4the cover is idle in the
sense that the cover and the insulation walls I6 70
and I1 carried therewith may move a certain
distance before the lug 28 in the switch disk
again engages the detent I8 of the latch. 'I‘he
detent Il of the latch is, of course, in its upper
position que to the deenergization of the electro 75.
spring, and said disk having means to engage
coming lug 26. When 26 engageswith I0, the
turning of the cover winds the spring 22 and
said latch, and ratchet means von said cover for
the switch disk and the Cover are again ten
sioned. When radial arm 21 engages with the
shoulder 28, the ends I6b and I'Ih of the members
I6 and I1 release the free ends of the terminal
springs 5 and 6 causing them to snap into the
magnet and, therefore, lies in the path of the on
clearances provided between each insulating bar
rier wall I6 and il, thereby to engage again with
contacts I8 and it which, meanwhile, have been
brought into position to be exposed through said
clearances. Therefore, the 'various parts again
assume‘the normal relation shown in Figure 7.
vis From this figure it will be apparent that- the
mutually tensioned switch disk and cover are
y respectively held in their locked positions by
the lug 26 on the switch disk engaging with the
detent I0 of the latch and because the free ends
of the terminal springs 5 and 6 engage behind
the ratchet shoulders ißb and lib of the insula-n
tion barrier walls.
In the event that the short or overload persists
in the line, it will be impossible to reset the de
vice because immediately upon terminal springs
5 and 6 engaging with contacts i8 and I9 of the
switch block, the circuit through the device will
be re-established, thereby energizing the electro
magnet `which will immediately pull the latch type
30 armature ‘i downwardly so that the detent lil
is out of the path of either of the lugs 25 or 26.
>In the event that the overload is greater than
the amperage at which the electro-’magnet will
_ function, it will, oi course, be understood that
35 the fusible conductor or connector 2i will “blow”
and thus fully protect the line in which the de
vice is installed;
In the _event that the :fusible conductor 2i for
the contacts i8 and i9 becomes ruptured or
broken, it is possible to readily replace a new
switch disk in the cover by simply removing the
fastening 24 and reinserting a new dislrwitli
a fresh fusible connector. ri’ìherei‘ore, the device
as a whole need not be discarded but may be
readily replaced in serviceable condition by simply renewing the switch disk 2d.
Without further description it is thought that
the features and advantages of the invention will
be readily apparent to those skilled in the art,
and it will of course be understood, that changes
in the form, proportion and minor details of
construction may be resorted to, without depart
ing from the spirit .of the invention and scope
of the appended claims.
1, An electric service line protector including
` in combination, an armature type latch normal
ly spring biased to latching position, an electro
magnet for actuating the latch, a pair of oppo
sitely located spring terminals, a' switch disk
overlying the latch and having means for engag
ing therewith, said switch disk having opposite
contacts connected by a fusible conductor adapt
ed to carry an amperage substantially higher
than the amperage for which the electro-magnet
is set `to function.
2. An electric service line protector including,
, in combination, a latch spring-biased to latching
engaging the pawl ends of the line terminals.
3. .An electric service line protector including,
in combination, a latch spring~biased to latching
position, an electro-magnet for the latch, a pair
of combined pawl and line terminal elements,
a rotatable cover having ratchet shoulders there
on for cooperating with said terminal elements
to compel movement of the cover in one direc-'
tion, a disk, conductor means on -the disk for
bridging said line terminals, a coil spring for
connecting the disk ’to the cover, said disk hav
ing means cooperating with the cover to limit
its movement relative thereto, and means on the
disk for engaging the latch to tension the coil
spring when ythe ratchet shoulders on the cover
are in abutting engagement with the combined
terminal and pawl elements, thereby .to cause
the conductor means onv the disk to complete a
circuit between the line terminal elements.
An electric service line protector-including,
in combination,- a base having spring line-ter
minal members, a latch spring-biased to latching
position, an electro-magnet for said latch, a ro
iatable cover having ratchet shoulders cooperatn
ing with the ends of said terminal members to
compel movement of the cover in one direction,
a dislr within the cover and having contacts
bridged by a conductor, a coil spring for con
necting the disk with the cover,- and means on
the disk for engaging with the latch for ten
sioning the disk relative to the cover and also
normally to maintain the contacts on the dislr
in engagement with the terminal members'.
5. .ein electric service line protector including,
in combination, an electro-magnet, a _pair of
spring brush terminals, one oiwhich is included
in circuit with said electro-magnet, a spring»
biased armature-type latch responsive to a ñeld
generated by the electro-magnet, a_`rotatable
cover having abutments> thereon, a switch disk
mounted on the cover and movable between said
abutments, a spring connecting the dist: and .
cover, means on the disk for engaging said latch,
a pair ci contacts on the switch disk for engag
ing said terminals, and a fusible conductor con
necting said contacts.
6. An electric service line protector compris
ing, in combination, a base, an electro-'magnetic 50
latch thereon, upstanding brush terminals on
the base, a cover rotatably'held to the base, in
sulating barrier walls carried by the inside face
of the cover and projecting therefrom into the
zone of the upstanding brush terminals, said
walls being spaced from each other at their ends,
and one adjacent pair of ends being notched to
provide abutment shoulders, a switch disk housed
within the said walls, a radial arm on the disk
for alternately engaging with said shoulders, a 60
coil spring for connecting the disk to the cover,
and contacts carried by the disk and connected
by a fusible conductor.
7. An electric service line protector compris
ing, in combination, a base of insulating mate~
rial, an electro-magnetic .latch on the base
spring-biased to normal position, lineV terminals
position, an electro-magnet for the latch, yield
able line terminals »mounted to have their free
at opposite sides of the base and comprising
ups'tanding spring members with free end por
tions, an insulating cover rotatably held to the
ends to function as pawls, a two-part rotatable
cap unit including a cover and a disk rotatably
base, arcuate insulation walls on the cover at the
inside faces of the line terminals spaced apart
connected and said disk carrying contacts con ~ at their ends to provide clearances for the free
nected by a fúsible conductor, said vcover and disk end portions of the line terminals to spring in
being also connected by a coiled tensioning
wardly and the rear ends of said. walls adapted to
y engage the free end portions of said terminals,
a disk having a central chamber for receiving a
faces of the line terminals, each„wall having a
pointed toe and a shouldered heel and spaced
coil spring, one end of which is connected to the
apart circumferentially to provide clearances for
disk while the other is yanchored to the cover,
contacts on the disk at diametrically opposite
pointsl and connected by a conductor, cooperat
ing means on the ldisk and insulation walls to
permitting the free end portions of the terminal
springs to move inwardly, a disk having opposite
‘limit movement of the disk relative to the cover,
land diametrically spaced means`at the _face of
the disk opposite the cover for alternately en
gaging with said latch means.
8. An electric service line protector compris
contacts connected by a conductor adapted to be
normally exposed in said clearances to engage
the terminals springs, said disk being mounted
on the cover within the arcuate members and
connected by a coil spring with the cover, a ra 10
dial projection on the disk movable between
spaced abutments on the arcuate ~» insulation
ing, in combination, a base of insulating mate-_ walls, and means at the face oi’ the disk lying
rial, -an electro-magnetic latch on the base next to thelatch for engaging the latter to
15 spring-biased to normal position, line terminals cause the spring to be fully tensioned when the
at opposite sides of the base and comprising up,-L shouldered heel portions of the insulation walls
standing spring members with Afree ends, an in
are engaged with the ends of the line terminals.
sulating cover rotatably lheld to the base, arcu
ate insulation walls on the cover at the inside
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