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Патент USA US2126674

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Aug. 9, 1938.
w. L. STOUT
2,126,674
ELECTRICAL RELAY
Filed OCT” 18, 1935v
2 Sheets-Sheet
.12."
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ATTORNEY
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Augu 9, 1938.
w_ L, STQUT
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'
2,126,674
ELECTRICAL RELAY
Filed Oct. 18, 1935
2 Sheets-Sheet
2
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INVEN'TOR
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6.
WzZtarL. Stout.
main/\- ‘ 5:
HIS
ATTORN EY
Patented Aug. 9, 1938
W’
' 2,126,674
STTE'S PATENT OFFICE
2,126,674
ELECTRICAL RELAY
Walter L. Stout, Edgewood, Pa., assignor to The
Union Switch & Signal Company, Swissvale,
Pa.I a corporation of Pennsylvania
Application October 18, 1935, Serial No. 45,615
6 Claims.
(01. 173-328)
v invention relates to electrical relays and
plate, the parts preferably being so proportioned
the lilre, and particularly to detachable terminal
plates for such devices.
that the diameter of the terminal plate is slightly
smaller than the diameter of the top plate.
“One object of my invention is to provide a de
5 tachable terminal plate-which may be quickly
secured to, or detached from, the usual top plate
of a relay, and which when secured to the top
plate will automatically e?ect the proper external
circuit connections with the relay, thus making
10 it possible to replace a relay which is in service
with another similar relay without causing de
lays in the operation of the system of which the
relay forms a part.
Another object of my invention is to provide
16 a detachable terminal plate of the type described
which requires a minimum number of parts, and
which can be manufactured at a minimum cost.
I will describe two forms of relays embodying
my invention, and will then point out the novel
20 features thereof in claims.
in the accompanying drawings, Fig. l is a view
partly in section and partly in elevation, show
ing one form of detachable terminal plate em
bodying my invention mounted on a relay top
35 plate. Fig. 2 is a top plan view of the top plate
13 shown in Fig. i. Fig. 3 is a bottom view of the
‘ detachable terminal plate shown in Fig. 1. Figs.
'4 and 5 are detail views showing a modi?cation
oi a portion of the terminal plate shown in Figs.
30 l, i and 3. Fig. ii is a view similar to Fig. 1 show
ing a modi?ed form oi? the detachable terminal
plate illustrated in Fig. l.
@
Slur reference characters refer to ‘similar
parts in each of the several views.
35
Reierring first to Figs. 1 to 3, inclusive, the
reierenoe character A designates the usual top
plate of an electrical control device such for ex
ample as an electrical relay, and the reference
character i designates a suitable casing which is
40 secured to the top plate A and which houses the
operating and contact mechanisms (not shown)
oi’ the relay. Mounted on the top plate A in the
usual manner are a plurality of terminal posts 2
cl standard construction, through the medium of
45 which external electrical connections with the
operating and contact mechanisms of the relay
are adapted to be made.
Associated with the top plate A is a detachable
terminal plate B embodying my present invention.
50 This terminal plate, which is of insulating ma
terial, is adapted to be disposed above the top
plate A in axial alignment therewith, and is pro
vided at its outer edge with a depending annular
?ange t which supports the terminal plate in
is spaced parallel relation with respect to the top
Mounted on the terminal plate are a plurality
of terminal posts 4. These-terminal posts are 5
similar in construction to the terminal posts 2
and each aligns vertically with a different one of
the terminal posts 2, as many terminal posts 4
being provided as there are terminal posts 2.
Secured to each terminal post 4 on the under side 10
of the terminal plate B is a contact member 5,
the upper end of which fits in a recess 6 provided
in the under side of the terminal plate B, and:
cooperates with the head of the associated ter
minal post 4 in such manner that ‘both the ter-‘ 15
minal post and the contact member are prevented
from turning. Each contact member 5 is pro
vided with 'a plurality of depending ?exible con‘-‘
tact ?ngers iia (preferably three or more) which
contact ?ngers are biased toward each other by 20,,‘
their own resiliency, and which are so shaped that
each of these ?ngers will engage anassociated
one of the terminal posts 2 with a relatively large
contact area. The ?ngers 5a are each bent out
wardly at their lower ends in the manner shown 25
for a purpose presently to be described. Each ter- .
minal post 4 is provided with the usual clamping
nuts 4“ and also with an insulating nut ‘l which.
covers the upper end of the terminal post. The
function of the insulating nuts ‘I is to“ prevent 30
short circuits due to metal objects coming in con
tact with two or more of the terminal posts or
vice versa.
“
A wedging plate 8, which is‘ also of insulating
material, is mounted for vertical sliding move- 35
ment within the ?ange 3 of the terminal plate B‘,
and is provided with a plurality of vertically dis
posed holes 9, one of which surrounds the ?ngers
5a of each contact member 5 in the manner shown.
The lower ends of the holes 9 are enlarged to re- 40
ceive the clamping nuts I 0 which are provided on
the terminal posts 2 to secure these terminal posts
to the top plate A, and these holes are provided
at the junctions of their enlarged lower ‘portions
and the upper portions with a tapered connecting 45
portion which cooperates with the outwardly bent
lower portions of the ?ngers in such manner that
when no downward force is exerted on the wedg
ing plate relative to the terminal plate, the resili
ency of the contact fingers will force the wedging 50
plate upwardly to a position in which the wedging
plate exerts very little, if any, force on the con
tact ?ngers, but that, if the wedging plate is
forced downwardly relative to the terminal plate,
the tapered portions of. the holes 9 will cooperate 55
2
9,198,674
with the outwardly bent portions of the ?ngers ‘ downwardly to the position shown in the draw
I‘ to force the ?ngers inwardly, and will thus ings and a contact ?nger 5'} should break, the
cause the ?ngers to be clamped into engagement broken ?nger will be prevented from falling out
with the terminal posts 2 in a manner to make of the associated hole 8, thus precluding the pos
good electrical and mechanical contact with the sibility of a broken ?nger ‘causing undesirable
terminal posts. The wedging Plate I may be short circuits.
forced downwardly relative to the terminal plate
Referring now to Fig. 6, the terminal plate
by any suitable means such, for example, as a here shown is similar to that shown in the pre
plurality of thumb screws ll, screwed through ceding views with the exception that the wedging
threaded bushings It molded in the terminal plate plate I has been turned upside down, and that
10
'8, and engaging the upper sides of the wedging the
contact members I have been replaced by
plate. The thumb screws may be locked in any contact
members ll having depending contact
desired position by means of lock nuts l2.
. In applying a top plate of the type described
to a relay for the ?rst time, all nuts and washers
which are usually provided on the terminal posts
2 with the exception of the'nuts II and washers
shown are ?rst removed from the terminal posts
2 of the relay, and if the relay has already been
in service, all circuit wires are also removed from
the terminal posts. Each circuit wire is then
attached to the terminal post 4 of the detachable
terminal plate 13 corresponding to the terminal
post 2 of the relay to which such wire was pre
viously connected or would be connected if the
detachable terminal plate were not provided.
The thumb screws II are next backed out far
enough to insure that all tension due to the
, wedging plate is removed from the ?ngers 5‘ of
the contact members 5, and the terminal plate
is then placed in the Proper axial alignment with
the top plate A and forced downwardly to the
position in which the ?ange 2 engages the upper
side of the top plate A, thus causing the contact
?ngers I‘ to engage the associated terminal posts
2 of the ‘relay. The wedging plate I is next forced
downwardly by means of the thumb screws ii to
the position in which it is shown in the draw
ings, thus causing the tapered portions of the
lples t to engage the outwardly bent lower ends
of the ?ngers and force the ?ngers inwardly in
the manner previously described to provide good
electrical and mechanical contact with the ter
. minal posts.
:
-
When a relay has been provided with a re
movable terminal plate of the type described,
and it is subsequently desired to remove the re
lay from service, the thumb screws are ?rst
backed out far enough to permit the wedging
plate to move upwardly and remove the tension
from the ?ngers II of the contact members.
The terminal plate is then lifted bodily oil of
the top plate of the relay and placed on' the
top plate of the replacement relay, after which
the wedging plate is again forced downwardly
to the position shown in the drawings by means
of the thumb screws II.
The lock n'uts l2 are
then tightened and the replacement relay is
ready for service.
Under some conditions it may be desirable to
force the wedging. plate downwardly to such a
position that the lower ends of the ?ngers is
will no longer be effective to raise‘the wedging
plate when the thumb screws ii are backed out,
and when this is the case, the thumb screws It
may be anchored at their lower ends in the
wedging plate 8 in the manner shown in Figs. 4
and 5. With this latter arrangement, it will be
apparent that the wedging plate is compelled to
70 move vertically with the thumb screws, but that
the thumb screws are‘free to rotate relative to
the wedging plate.
It should be particularly pointed out that with
the detachable terminal plate constructed in the
manner described, if the wedging plate is forced
?ngers II. the lower ends of which are provided
with inwardly bent portions which cooperate
with the tapered portions of the holes 8 in the 15
wedging plate in such manner that movement of
the wedging plate toward the terminal plate will
force the ?ngers I‘ into engagement with the
associated terminal posts 2 on the relay top plate
A rather than movement of the wedging plate 20
away from the terminal plate. The operation of
the structure shown in Fig. 6 will be apparent
from the foregoing and from an inspection of
the drawings without further description.
One advantage of a terminal plate embodying
my invention is that a minimum number of parts
are required all of which are easy to manufac
ture.
A further advantage of a terminal plate em
bodying my invention is that the contact mem 30
bers I and II can be so constructed that the
contact ?ngers will engage a maximum amount
of the surface of the terminal posts 2, vthus in
suring a reliable contact with the terminal
posts,
-
'
35
A still further advantage of a terminal plate
embodying my invention is that only one wedging
plate is required which permits the top plate to
be constructed with a minimum overall height.
Although II- have herein shown and described
only one form of detachable terminal plate em
bodying my invention, it is understood that va
rious changes. and modi?cations may be made
therein within the scope of the appended claims
without departing from the spirit and scope of 45
my invention.
Having thus described my invention, what I
claim is:
1. The combination with an electrical relay
provided with a top plate having a plurality of 50
terminal posts mounted thereon for making elec
trical connection with the operating and con
tact mechanisms of the relay, of a detachable
terminal plate of insulating material having
mounted thereon a plurality of terminal posts 55
one of which aligns with each terminal post on
said top plate, a plurality of contact members
secured to the terminal posts on said terminal
plate on one side of said terminal plate, each said
contact member being provided with a plurality
of contact ?ngers which are adapted to engage
the associated terminal post on said top plate, a
wedging plate secured to said terminal plate for
movement toward and away from said terminal
plate, means for moving said wedging plate, and 65
means responsive to movement of said wedging
plate away from said top plate for securely
clamping said contact ?ngers into engagement
with the associated terminal posts on said top
plate.
2. The combination with an electrical device
provided with a top plate having a plurality of
terminal posts mounted thereon for making ex
ternal electrical connections with the device, of a
detachable terminal'plate of insulating material
70
3
2,120,074
having mounted thereon a plurality of terminal
posts one of which aligns with each terminal post
on said top plate, a plurality of contact members
one secured to each terminal post on said termi
nal plate and each provided with a plurality of
contact ?ngers which are biased toward each
other by their own resiliency and which are
adapted to engage the aligned terminal post on
said\top plate, each said contact ?nger being
provided at its free end with an outwardly bent
10
vided with a tapered portion which cooperates
with the inwardly bent portion of the ?ngers to
force the ?ngers into engagement with the termi
portion, an insulating wedging plate movable
toward and away from said terminal plate and
nal posts‘ on said top plate when the wedging
plate is moved toward said terminal plate, and 5
means on said terminal plate for moving said
wedging plate toward said terminal plate.
5. The combination with an electrical device
provided with a top plate having a plurality of
terminal posts mounted thereon for making ex 10
ternal electrical connections with the device, of
provided with a plurality of holes one of which
surrounds the contact ?ngers of each contact
member and each of which is provided with a
tapered portion which cooperates with the out
a detachable terminal plate of insulating mai '
terial having mounted thereon a plurality of
terminal 'posts one of which aligns with each
terminal post on said top'plate, a plurality of 15
contact members one secured to each terminal
wardly bent portions of the ?ngers to force the
post on said terminal plate and each provided
with a plurality of contact ?ngers which are
biased toward each other by their own resiliency
and which are adapted to engage the aligned 20
away from said terminal plate, and means on
20 said terminal plate for moving said wedging plate terminal post on said top plate, each said contact
?nger being provided adjacent its free end with
toward and away from said terminal plate.
an inwardly bent portion, an insulating wedging
3. The combination with an electrical device plate movable toward and away from said termi
provided with a top plate having a plurality oi nal plate and provided with a plurality of holes 25
terminal posts mounted thereon for making ex
one of which surrounds the contact ?ngers of
ternal electrical connections with the device, of each contact member and each of which is pro
a detachable terminal plate of insulating ma
vided with a tapered portion which cooperates
terial having mounted thereon a plurality oi ter
with the inwardly bent portions of the ?ngers to
minal posts one of which aligns with each termi
force the ?ngers into engagement with the termi 30
nal post on said top plate, a plurality of contact nal posts on said top plate when the wedging
30
members one secured to each terminal post on plate is moved toward said terminal plate, and a
said terminal plate and each provided with a plurality of thumb screws screwed through said
plurality of contact ?ngers which are biased to
terminal plate and anchored at their lower ends
ward each other by their own resiliency and
35
in
said wedging plate.
which are adapted to engage the aligned terminal
6. The combination with an electrical device
85 post on said top plate, each said contact ?nger
having a. top plate provided with projecting
being provided at its tree end with an outwardly terminal posts for making external electrical con
bent portion, an insulating wedging plate mov
nections with the device, of a detachable terminal
able toward and away from said terminal plate plate of insulating material having mounted 40
and provided with a plurality of holes one of thereon a plurality of terminal posts one of
40 which surrounds the contact ?ngers of each con
aligns with each terminal post on said
tact member. and each of which is provided with which
top plate, said terminal plate being provided at
a tapered portion which cooperates with the out
its outer vedge with an annular ?ange which rests
wardly bent portion of the ?ngers to force the on said top plate and which supports said termi 45
?ngers into engagement with the terminal posts
on said top plate when the wedging plate is moved
45
50
fingers into engagement with the terminal posts
on. said top plate when said wedging plate is
moved away from said terminal plate, and a plu
rality of thumb screws screwed through said ter
minal plate and anchored at their lower ends
in said wedging plate.
-
4. The combination with an electrical device
provided with a top plate having a plurality of
terminal posts mounted thereon for making ex
ternal electrical connections with the device, 01
a detachable terminal plate of insulating ma
55 terial having mounted thereon a plurality oi’
_ terminal posts one oi! which aligns with each
terminal post on said top plate, a plurality of
contact members one secured to each terminal
nal plate in ?xed spaced parallel relation with
respect to said top plate, a plurality of contact
members one secured to each terminal post on
said terminal plate and each provided with a
plurality of contact ?ngers which are biased to 50
ward each other by their own resiliency and
which are adapted to engage the aligned terminal
post on said top plate, each said contact ?nger
being provided with an outwardly bent portion,
a wedging plate slidabiy mounted within said 55
?ange ior axial movement between two positions
relative to said terminal plate and provided with
a plurality 01 holes one of which surrounds
the contact ?ngers of each contact member and
each of which is provided with a tapered portion
post on said terminal plate and each provided
60 with a plurality of contact ?ngers which are which cooperates with the outwardly ‘bent por
tion of the ?ngers in such manner that said
biased toward each other by their own resiliency wedging plate is normally biased by the ?ngers
and which are adapted to engage the aligned to one position but becomes e?ective when moved
terminal post on said top plate, each said contactv
its other position to force the ?ngers into 65
?nger being provided adjacent its free end with to
with the terminal posts on said top
an inwardly bent portion, an insulating wedging engagement
plate, and means including a plurality of thumb
plate movable toward and away from said termi
screws for moving said wedging plate from its
nal plate and provided with a plurality of holes one position to its other position.
one of which surrounds the contact ?ngers of
WALTER L. STOUT. 70
each contact member and each of which is pro
70
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