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Патент USA US2125126

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July 26, 1938.
11 $_ RlVERs
2,125,126
ELECTRIC CIRCUIT PROTECTOR
7
4
/'_~ 3
Filed Sept. 1, 1957
I'
2 sheets-Sheet 1
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July 26,, 1938.
Di 5 RlvERg
'
2,125,126
ELECTRIC CIRCUIT PROTECTOR
Filed Sept. 1, 1957
2 Sheets-Sheet P
Patented July 26, 1938
2,125,126
UNITED STATES
PATENT ‘OFFICE
2,125,126
ELECTRIC omcm'r rnorao'ron' .
_
' Durward S. Rlveranlndianapolis, Ind. ‘
Application September 1, 1937, Serial No. 181,313;
'
0 Claims. ‘ (c1. zoo-415.5)
vThis invention relatesto means Ior preventing
damage in electrical circuits'due to overloads or
short circuits. The form of the invention herein
shown and described is particularly adapted for
use in-extension cords and may be incorporated
‘directly in the attaching plug or in an adapter
'
'
.
contactor l5 extends rearwardly along the body Ill
to bend thereagainst in a yielding manner within
the groove l6 formed along that side of the body
It). The rearmost end 0! the contactor I5 is
turned outwardly so that the connecting prong 5
I1 01 the connecting plug (not shown) may be
formed to receive the plug.
.
inserted between the contactor l5 and the side
The primary object of the invention is to pro ‘. of
the body In within the groove I6.
I
vide a structure which will interrupt a circuit at
On
the
opposite
side
of
the
body
In
a
prong
I8
a predetermined flow of current with the re
quired degree of accuracy, and which may be' is carried in parallel relation to the prong l2 and 10
' reset without having to replace parts after the is mounted on the body In by extending inwardly
through the head H and having a foot l9 turned
overload condition has been removed.
‘ Another important feature of the invention is‘ at right angles to abut the outer end of the body
l0 within the transverse slot across the head II.
16 that the protecting device may be present in
every extension cord in series with the common The side slot through the‘head ll prevents turn- 15
‘mg of the prong ‘l8 and a rivet 20 is passed en
link fuse.
‘
,
. Further important advantages of the invention tirely through the body l0 axially to be headed
are to be found in the small ‘and compact struc~ . by one end over the root is and by the other end
ture and particularly in the unique combination
of ' these various elements as set forth in the
appended claims.
-
These and many other objects and advantages
of the invention willbecome apparent to ‘those
versed in the art in the following description of
the invention as illustrated in the accompanying drawings in which:
.
Fig. 1 is a side elevation in partial section of the
plug adapter embodying the invention;
Fig. 2, a top plan view in partial section;
3, a transverse section on the line 3-3 in
Fig.
:
'
-
Fig. 4, a section on the line‘ 4-4 in Fig.’ 1;
Fig. 5. a central longitudinal section through
the cord plug embodying the invention;
within the slot in the rear end of the body.
Between the rear head of this rivet 20 and the 20
body is secured an end 01‘ a bi-metal strip 2| which
is carried laterally from the body l0, Fig. 1, and
thence is bent around to be substantially paral
lel with- the body It) and is carried iorwardly'
‘through .the longitudinal slot in the head H to 25
terminate in a hooked end 22.
On the opposite side of the body II! from the
strip 2| is anchored a toot of'the spring 23 by
means of a screw 24. This spring 23 is carried
forwardly through the longitudinal slot in the 30
head I I and is bent around and across over the
end slot in the head to terminate by a rounded
end normally engaged under the hook 22 of the i _
bi-metal 2|. The strap 25 is interposed by one.
Fig. 6, a similar section on the'plane 90 degrees ~ end between the screw 24 and'the spring 23 and 35
is carried around the body ID to the side thereof
.
oppositeto the‘ screw I 3 where the screw 26 passes
Fig. 7, a transverse section on line 1-1 in Fig. through the foot of the second contactor 21 and
from that 01' Fig. 5;
6;
and
o
.
.
Fig. 8, a transverse section on line 8-8 in Fig; 6.
Like characters of reference indicate like parts
in the various views in the drawings. '
Referring to the drawings, the structures are
shown on an enlarged scale.
.
Referring ?rst to the form oi’ the invention as
illustrated in Figs. 1-4, a body I. is formed from
some suitable‘ insulating material to have an en
larged head ll, herein shown as being slotted in
two directions 90 degrees apart across its outer‘
end. A terminal prong I2 is attached to the body
ill by its inner end by means of the screw ii to
' have the prong l2 carried'within one of the slots
. through the head II and extending therebeyond.
Between the head 01’ the screw l3 and the prong‘
55
l2‘is positioned a foot of the contactor is. This
through the strap 25 to engage the body ID.
This contactor 21 is similar in shape to the con
tactor I! and yieldingly presses against the'side 40
of the body -Il within the groove or slot 28 into -
which the second prong 29 in the connecting
plug (notshown) is engaged undenthe contactor
21. ‘Thus it is to be seen that an electrical cir- 45
cult is established between the contractor 21 and
the prong I! through the strap 25, spring 23, bi
metal 2| and the rivet 20.
In order to enclose the structure above de
scribed, an insulating housing 30 is provided to re- 50
ceive the body II and the head H. The housing
30 is provided with a pair of slots 3| and 32
through which the prongs l1 and 29 may be in
serted through the end of the housing tov be en
gaged with the contactors as" above explained. 55
2,125,126
2 .
The other end of the housing 30 is initially open
and counterbored to leave an annular shoulder
33 therein spaced inwardly from the end. vThe
cap 34 is provided withsuitable slots ,to receive
therethroughthe prongs l2 and I8. Each of the
prongs is provided with detents 35 and 35, re
spectively, and so positioned that when the cap
43 a distance and then is bent around to extend
freely through the longitudinal slot on the side
of ,the body 40 to terminate by the hook end
49 within the transverse slot across the outer
end of the body 40. ,
.
'
_ On the side of the body opposite the slot carry
ing the bi-metal 41, is carried a spring 50 under
34 is pushed over these detents, the cap will be the terminal plate 5i ‘whichis secured to the
?rmly seated against the outer end of thehead 4 body 40 by the attaching screw 52. The spring
10v II by its innerrface and will be snugly engaged by .50 extends forwardly into the transverse slot
vthe detents on its outer face, whereby the body l0 across the end of the body 40 to have the rounded
end normally engaged under the hook end 49
and the parts mounted thereon are ?rmly sup
ported, by the cap 34 when this cap 34 is pushed of the bi-inetal. 'The other wire 53 of the cord
in the counterbore in the housing 30 and-seated is electrically connected to the plate 5i by means
.15 B881
e H. - r =diameter of the of the terminal screw 54.- Thus the circuit is
cap 34 made to ‘be such that there is ‘a pressed established ‘between the wire 53 ‘and the prong
" ?t between the cap and the wall of the housing '45 through the spring 50 and the bi-metal 47.
so that the cap 34 will be ?rmly retained thereby.
An enclosing, housing 55 is provided to receive
' The thickness of the‘ cap 34 and the position‘ of the wires 44 and 53 through the opening in one
the shoulder 33 are. madeto be such that there end. The cap 56 closes the other end'of the 20
is a substantial distance left within the outer housing by frictional engagement within the
end of. the‘ housing beyond the-outer face of the counterbore thereof. This cap 56 is slotted and
cap. This space is provided for travel‘of the reset permits the prongs 4| and 45 to extend there
button 31 which slidingly passes through the cap through, and in the same manner as described
34 in the path of the spring 23; The button 31 is‘ above, the prongs 4| and 45 carry the respective 25
provided with a head 38 on its inner end to limit detents 51 and 458 to bear against-the outer face
the outward travel of the button. '
. .
-
-
The bi-metal. 2| is selected as to composition,
shape and size to carry the normal full rated
130 capacity of the circuit without distortion. How
ever, when the circuit ?ow exceeds that : prede
of the cap 53 as means to hold the body 40 snugly
against the inner face, the reset button 59 slidingly
passing through the cap 56 and having a limiting
head 50 on its inner end. The head 60 is in the 30
pathof-the spring 50 whereby the button 59 will
termined ?gure, ‘the bi-metal 2| will bend 'by be moved outward as indicated by dash lines when
, its hook end away from the body l0 and toward‘ the circuit is interrupted by the movement of the
the wall of the housing 30 so as t’orelease the bi-metal 4'l‘and- whereby the spring 50 may be
end of the spring 23 and thereby break'the ‘cir
cuit. When the spring 23 is released, its free
end will tend to move toward the cap 34 and
will therefore push- the button 31 /outwardly
and give indication of an open circuit.
Before the circuit can be re-established, the
adapter must be removed from its ‘receiving
_ socket or. attaching plug, in ordeii that the button
31 may be pushed‘ inwardly to re-engage the
spring ‘23 with the bi~metal end 22. By the time
the adapter has been removed for this operation,
the bi-metal 2| will have been cooled sufficiently
to have returned to its original position for spring
engagement.
‘
'
The adapter, of course, will be used in ~the
circuits which are normally fused at some dis
restored to engagement with the bi-metal by 35
pushing in on the button.
‘While I have herein shown and described my
invention in the form as now best known to'me,
it is obvious that yarious structures may be em
ployed'without departing from the spirit of the
invention and I therefore do not desire to be
limited to that ‘precise form beyond the limita
tions imposed by the following claims.
I claim:
-
.
1. In a circuit protector, a body carrying a pair 45
of terminal prongs, means ?xing said prongs in
alignment on said body, a thermostatic metal
strip carried by the body, a spring actuated mem- -
ber carried by the body and normally releasably
engaged with said strip in series relation with one 50
tribution point and the opening of the circuit .of said terminal prongs and a connecting ter
. in the adapter is preferably made to be such that minal, whereby the circuit may be interrupted
the circuit will be broken'in the ada'pter'at a upon distortion of the strip through heat from
lower current flow than will blow out the fuse _a predetermined current overload to release said
'
. _
spring from said strip, a’ housing surrounding the
Where the circuit protector may be used di
body, a housing closure supporting said body, an
rectly by connecting'it on the end of the ex-. indicating and reset button in the path of said
tension-cord, the structure shown in Figs. 5-8 spring guided and limited in outward travel
‘is ‘employed. In this form there is a body 40 through said closure, said prongs being carried.
at the distribution point.
which carries along one side thereof _ a terminal
through said closure, saidhousing having apor
‘ prong'4i, passing through the slot in the head’ tion projecting beyond said closure in the direc
portion 42 so that the single terminal screw 43' - tion.of said prongs at least as far as the outward
will retain the prong 4| in‘positlon bypassing‘
through the inner end of the prong into .the
body. One of the wires 44 of‘the cord is secured
against the prong M by the screw 43.
.
limit-oi travel of said button.
2. In a circuit protector, a body carrying a pair
of terminal prongs, means ?xing said prongs in
alignment on said body, a thermostatic metal
Along the opposite side of the body 40 and
extending through the slot therealong is posi
tioned the other terminal prong 45 which has
strip carried by the body, a spring actuated mem
ber carried by the body and normally releasa'niy
engaged with said strip in seriesyrelation with
70 a foot 46 turned over onto the inner end of the
body 40.‘ The strip of the bi-metal 41 is con
nected and interposed between the foot 45 and
the vsecuring screw 48 which passes through the
terminal, whereby the circuit may be interrupted
upon distortion of the strip through heat from,
75
body, a housing- closure supporting said body,
one of said terminal prongs and a connecting 70
a predetermined current overload to release said
strip and foot to engage the body 40. ‘This -bi- ' spring from said strip, a housing surrounding the
metal strip 41 is carried laterally from the foot
60
2,1'as,,1 as
an indicating and reset button in the path of
said spring guided and limited in outward travel
through said closure, said prongs being carried
through said closure, said housing having a por
tion projecting beyond said closure in the direc-_
tion of said prongs, at least as far as the outward
limit of travel of said button, said terminal
comprising a spring member yieldingly pressed
toward the body, and a second like terminal
10 spring member electrically connected to the other
of said prongs, said housing having openings ar
ranged to permit engagement of other prongs
therethrough with said terminal members, where
by said protector‘ may be used as an intervening
15 adapter between the male and female parts of a
standard connecting plug.
3. In a~circuit protector, a body of insulation
slotted along one side, a connecting prong posi
tioned in said body slot secured thereto and
20 carrying a terminal, said body being provided with
a second slot on its opposite side, a second prong
carried in said second slot and having a foot
3
abutted against the inner face of the closure after
the prongs have been passed through the closure
to ‘permit said detent to engage said outer face.
5. In a circuit protector, a body of insulation
slotted along one side, a'connecting prong posi
tioned in said body slot secured thereto and
carrying a terminal, said body being provided
with a second slot on its opposite side, a second
prong carried in said second slot and having a
foot turned over onto the body, means for secur 10
ing the foot to the body, a thermostatic metal
strip electrically connected to said foot and rigid
ly mounted by one end in relation to the body,
said strip being carried along a- side of the body
removed from either prong side, a leaf spring 15
secured by one end on the body opposite said
strip side and carried therealong to bend over the
body end into releasable normal engagement with ’
said strip between said prongs, a housing about
said body, and a housing closure at one end of
the housing carrying said body to have said
prongs extend outwardly through the closure, and
2o,
turned over onto the body, means for securing the , a reset button slidingly carried by the closure in
the path of said spring, said housing having a
foot to the body, a thermostatic metal strip elec
trically connected to said foot and rigidly mount
ed by one end in relation to the body, said strip
being carried along a side of the body removed
from either prong side, a conductor secured by
one end on the body opposite said strip side and
30 carried therealong to turn in a yielding manner
over the body end into releasable normal engage
ment with said strip between said prongs, a hous
ing about said body, and a housing closure at one
35
end of‘ the housing carrying said 'body'to have said
prongs extend outwardly through the closure,
and a reset button slidingly carried by the closure
in the path oi-‘said conductor, said housing hav
ing a portion extending beyond said closure with
in which extension said button may travel.
4. In a circuit protector, a body of insulation
40
slotted along one side, a connecting prong posi
tioned in said "body slot ‘secured thereto and
carrying a‘ terminal, said body being provided
with a second ‘slot 'on its opposite side, a second
45 prong carried in said second slot and having a
foot turned over onto the body, means for secur
ing the foot to the body, a thermostatic metal
strip electrically connected to 'said toot and rigid
ly mounted by one end in relation to the ’body,
50 said strip being carried along a side of the body
removed from either prong side, a leaf spring se
cured by one end on the body opposite said strip
side and carried therealong to bend over the body
end into releasable normal engagement with said
55 strip between said prongs, a housing, about said
body, and a housing closure at one end. of the
housing carrying said body to have said prongs
extend outwardly through the closure, and a reset
button slidingly carried by the closure in the path
60 of said spring, said housing having a portion ex
tending beyond said closure within which exten
sion said button may travel, a detent on at least
portion extending beyond said closure within 25
which extension said button may travel, a detent
on at least one of said prongs engaging the outer ‘
face of said closure whereby said body- will be
?rmly abutted against the inner face of the clo
sure after the prongs have been passed through
the closure to permit said detent to engage said
outer face, said closure being a part separate from
said housing and attached thereto by frictional
engagement within a bore in the housing.
6. In a circuit protector, a body of insulation 35
slotted along one side, a connecting prong posi
tioned in said body slot secured thereto and
carrying a terminal, said body being provided with
a second slot on its opposite side, a second prong
carried in said second slot and having a root 40
turned over onto the body, means for securing the
foot to the body, a thermostatic metal strip elec
trically connected to said foot and rigidly mount
ed by one end in relation to the body, said strip
being carried along a side of the body removed
from either prong side, a leaf spring secured by
one end on the body opposite said strip side and
carried therealong to bend over the body into re
leasable normal engagement with said strip be
tween said prongs, a housing about said body, and
a housing closure at one .end or the housing carry
ing said body to have said prongs extend out
wardly through the closure, and a reset button
slidingly carried by the closure in the path of
said spring, said-housing having a portion extend 55
ing beyond said closure within which extension
said button may travel, ahead on said body at
said body end having a transverse slot there
across receiving said bent over spring end there
across, said metal having a hooked end presented a
within said slot for said spring engagement, and
shiitable therealong under in?uence of heat.
one oi’ said prongs engaging the outer face of
said closure whereby said body will be ?rmly
mmwann s. Rrvans. "
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