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Патент USA US2125256

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July 26, 1938.
E. B. FAIRBANKS
2,325,256
DETACHABLE TERMINAL BOARD FOR ELECTRICAL' DEVICES
Filed June 8, 19.35
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Patented July 26, 1938
2,125,256‘
UNITED STATES PATENTOFFICE
DETACHABLE TERMINAL BOARD FOR, ELECe
TRICAL DEVICES '
.
Edwin B. Fairbanks, Goldwater, N. Y., assignor to
(genxeral Railway Signal Company, Rochester
Application June s, 1935, Serial No. 25,616
10 Claims. (01. 173-328)
This invention relates in general to electrical only which is to be employed on a relay of the
apparatus, and more particularly to a detachable“ type shown in Patent No. 1,766,665, granted to
terminal board for electrical devices such as employed in railway signalling systems or the like.
01
Inrailway signalling systems, certain electrical
J. F. Merkel on June 24, 1930, but it is to be un
derstood that a detachable terminal board em
bodying the features of the present invention 5
devices such as relays form a part of a rather may be constructed to cooperate with many other
complicated circuit arrangement, which makes it forms of electrical devices. In the relay illus
very important that the external electrical con- . trated in Fig. 2 by the dot and dash lines, it is
nections to these relays are always placed on the merely ‘necessary for an understanding of the
10 proper terminal posts and are so secured to these ' .present invention to know that an upright cylin- 10
posts that a reliable low resistance electrical connection is formed. However, it is necessary to‘
occasionally remove the relays from the system
,for replacement, repair or the like, and conseis quently the large number of circuits involved in
drical relay housing 4 is provided with a cylindri
cal horizontal insulated top 5 upon which a plu-‘
rality of upright terminal bolts 6 are assembled.
The terminal bolts 6. are clamped to the relay
top 5 by nuts ‘I, and these terminal bolts 6 are 15
'
making such a change often results in delaying
of course connected within the relay housing to
-1orma1 operation of the signalling system for an
undue length of time, and also there is a great
possibility of improperly replacing the electrical
various contacts, operating coils and the like ‘in
accordance with the usual practice.
The detachable terminal board of the present
20 connections with possible danger of improper
operation or of further delay.
invention as shown in Fig. 1 and Fig. 2 is formed 20
by two discs l0 and I2 of suitable insulating
In viewof the’ above andother considerations, it material which are assembled one above the other
is proposed in accordance with the present in- by- two studs H as shown in Fig. 1, or as may be
vention to provide a terminal board upon which v seen in Fig. 2, these studs 14 extend upwardly
external electrical conductors are permanently Tthrough a slot in the lower disc [2 with reduced 25
secure and which can be installed on an electrical ends threaded into metal inserts l5 either molded
device or removed therefrom‘ with a minimum
or otherwise held in the top disc H1.
The top
of manual operation and yet which is arranged to disc I0 thus assembled above the lower disc is
provide a reliable low resistance connection be- permitted to slide horizontally through a limited
30 tween the electrical conductors and the associated distance relative to the lower disc l2 as allowed by 30
parts of the electrical device. It is further pro- the slots in the lower disc l2 which receive the
posed to provide such a terminal board which can /body portions of the assembling studs M.
be arranged on the electrical device to- complete
A horizontal stud I8 is provided in the upper
the electrical circuits involved only when the ex- disc ill with a protruding hexagonal head and a
35 ternal electrical conductors are connected to the reduced diameter inner end threaded into a metal 35
proper parts of the electrical device.
insert l9 molded or otherwise secured in the
Other objects, purposes and characteristic
features of the present invention will appear as
the description thereof progresses, during which
40 references will be made to the accompanying
drawing, in which
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top disc Ill. The larger diameter portion of the
stud I815 provided with an 911111113; grgove re
ceiving a forked upwardly extending end of a
metal block 20 clamped within a hollow center 40
e portion of the lower disc i2 by a screw M.
This
Fig. 1 is‘ a planview of one form of a detach. able terminal board constructed in accordance
with the present invention.
‘45 ~ Fig. 2 is an elevational sectional view of the
terminal board shown in Fig. 1 taken substantially on line 2_—2 and viewed in the direction
indicated by the arrows, the terminal board being herein illustrated as applied to one form of a
50 relay indicated by dot and dash lines.
Fig. 3 is a, sectional view illustrating a modi?cation which may be made in the terminal board
shown in Fig. 1 and Fig. 2.
In the accompanying drawing, a detachable
arrangement obviously permits the upper disc
lll‘to be moved to the right from its position shown
in Fig.2 relative to the lower disc lTby turning
the stud l8 inacounter-clockwise direction which 45
forces the threaded insert l9 and the top disc
ID to the right relative to the stud l8 which is
held stationary by the block "20 attached to the
lower disc, 12, the motion of the top disc l0 upon
the lower disc l2 being guided-by the slots in 50
the lower disc l2 which recsire the assembling
studs l4.
The discs I! and I2 assembled in this manner
~are normally supported abovethe top 5 of the
55 terminal board has been illustrated in one form
relay, and holes are provided in the lower disc 55
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2,125,256
12 which are spaced to receive the body portions
of each of the relay terminal ‘bolts 6. The top
disc I0 carries terminal bolts 22 arranged above
to the relay, it is clear that posts of the relay
would be connected to improper electrical cir
cuits,‘ thereby preventing proper operation of the
these holes in the lower disc 'l2 and correspond- ' system and possibly providing a dangerous con
ing to each of the terminal bolts 5 of the relay.
The square heads of the terminal bolts 22 rest
In the present arrangement however, this im
in rectangular depressions inthe top disc ill with ' proper replacement of the detachable terminal
one side of these heads engaging a side of the board assembly is prevented by the provision of ‘
depression to prevent turning. Spring contacts two spacing bushings 30 (see Fig.. 1) which are
24 01'_ a substantial \S-shape have their upper ends threaded over two extreme right-hand terminal
clamped between the heads of the terminal bolts posts 6 thus being a permanent part of the relay;
22 and the top discs [0, the terminal bolts 22 and and two bosses 32 are provided on the bottom disc
contacts 24 being clamped on the top disc ill by i2 around the holes receiving the two extreme
nuts 25. .
'
f
_ left-hand relay posts 6', which bosses 32 may be
The S-shaped spring contacts 24 extends down
15
integral or otherwise permanently attached to the
wardly into the hollow center portion of the lower detachable terminal board assembly. These spac 15
disc I2 with their lower ends engaging the sides ing bushings and bosses 32 incidently serve to
of associated relay terminal posts 6 as shown. A space the terminal board assembly a proper dis~
contacting surface may be formed in the lower tance about the relay top 5, but also prevent the
‘ends of ‘the spring contacts 24 by a pressed-out completion of electrical circuits if the terminal
portion as shown; and when the detachable termi vboard is improperly replaced on the relay inas 20
nal board thus formed is arranged on the relay as much as the bosses 32 would then engage the top.
"shown in Fig. 2, the spring contacts 24 will be of the spacers 30 carried by the relay'and prevent
biased with considerable force against the sides the spring contacts 34 from engaging the relay
dition.
"
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of their associated relay terminal postsii, this
posts 6.
'
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26
biasing .force being provided. byv the’ left-hand '
In Fig. 3, a modi?ed form of terminalmeans is
position of the disc l0 relative to the disc i2.
illustrated which may be‘ employed on the top
In other words, before installing the terminal disc I!) in place of the terminal bolts 22-. In this
~ board assembly upon the relay, the top disc Iii is form, bushings 34 having upper and lower ?anged,
operated to theright relative to the lower disc I2 ends are molded into the top disc I0 at the same
by‘ a counter-clockwise turning of the stud- l8, spaced locations as the terminal bolts 22 in Fig. 1 30
thereby operating-the spring contacts 24 to the
and Fig. 2. Contact springs 241 similar to the .
contact springs v24 of Fig. 2 are placed on
right relative to the holes in the lower disc l2
which receive the relay terminal bolts 6, and in
‘this manner the terminal board assembly may be
easily applied as the spring‘ contacts 24 will not
engage the top portion of the relay terminal bolts
the lower ends of the bushings 34 against
the lower ?anges and the extending lower 35
ends 01’ the bushings 34 are ?ared or spun over
the contact springs 24l thereby rigidly attaching
6. When the terminal board assembly is in,place, , the contact springs 241 to the bushings 34. Stud
. the stud l8 may be turned in a clockwise direction
bolts 221 are threaded into the bushings 34 ‘for
40 to provide and retain the desired contacting pres
clamping external electrical conductors against.
sure between the spring contacts 24 and the relay. the upper ?anged end of bushings 34, and it may
be desirable to provide stud bolts 221 which have
resiliency vof the spring contacts 24 assures that a heads insulated from their body portions whereby
_ good electrical connection will befmade with the to prevent short circuits from occurring inlthe
associated relay terminal posts \6 regardless of‘ event metal objects are accidently placed upon
slight differences between the spacing of the relay the relay terminal bolt assembly.
,_
~- terminal posts 6. In the present arrangement, the
terminal posts 6 and the posts 22. '
_
-
. Flexible electrical conductors for connecting
the relay to the external circuits are to be perma
'
A terminal board for} electrical devices has
thus been provided having means for perma
nently securing ?exible electrical. conductors
thereto and .whlch may be‘ easily and quickly‘in
stalled on an electrical device and by a single
may be providedtor this purpose so that low re-l ‘manual'operationhthe terminal board may be
sistance' electrical connections are made. _from manipulated to provide a reliable low resistance
these- conductors on the terminal posts 22 to the connection between the electrical conductors and‘
55 relay terminal posts 8 through the contact springs
associated parts of the device. Likewise».
24. 'When it is necessary toremove the relay from ‘the
single manual operation manipulates the present 66
the system, the horizontal stud I8 is turned in a terminallboard in a manner to permit it to be _
counter clockwise direction thereby moving'the
and quickly removed from the electrical
top disc II to the right relativetothe lower disc easily
device,v
the present terminal board is ar
l2 which relieves the biasing force of the spring ranged .and
to prevent replacement upon the electri
contacts 24 against the relay terminal posts 6 and cal device in a‘manner to improperly complete.
permits the terminalboard assembly to be easily electrical circuits. ‘In other words, a detachable‘
nently connected to the terminal posts 22 on the 7
top disc I}, andoneor more clamping nuts 28
removed from the relay.
_
t
_
’
.,
‘
.
, In the form of the relay to which the ‘present
65 detachable terminal board is applied, .the termi
75
terminal board has been provided for electrical devices which permits a device to be'removed -
nal posts form a symmetrical arrangement, and from an electrical _system and a replacement 135
'_consequently it is obvious that the terminal posts made in a minimum lengthrot time and which _
assures that the replaced deviceis properly con?
22 would aline with terminal posts 0 of the relay nected
into the electrical system.
J in either of two positions-or that is, the detach
The above rather speci?c description .of one
‘able' terminal board assembly might be rotated 180 ' form
or the present invention is given solely by 70,
degrees irom its proper pomtion‘with respect to
way
of
example,‘ and is not intended, in any
the‘ relay, and in such‘ a positionthe terminal
in a limiting sense. It will
' posts 22 would still aline'with certain terminal manner-whatsoever,
posts 8 of the relay.
the present terminal be obvious that the general principles herein dis
closed may be. embodied: in many other organi
board assembly could be thus improperly applied mtions
widely diilerent from those illustrated
1s»
2,125,258
.
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3
without departing from the spirit of the invention ' silient spring contacts attached to the metal
bushings and extending into the ?rst insulating
de?ned in the following claims.
member, and means rotatably carried by the ?rst
- What I claim is:
insulated member and threaded into the second
1. A terminal board for electrical devices hav
ing extending terminal posts, comprising a lower insulating member for engaging the spring con
insulating member receiving the terminal posts tacts with the terminal posts.
of the electrical device, an upper insulating mem
ber movably assehbled on the lower insulating
‘ member, wire terminal means on the upper in
6. In an electrical system, a device having par
allel extending terminal posts, a ?rst member ?t
ting longitudinally over the terminal posts, a sec
10 vsulating member, contact springs attached to the
wire terminal means and extending downwardly
ond insulating member having permanent wire 10
connections, and contacts attached to the wire
to engage sides of the terminal posts of the elec
trical device, and a threaded manually operable
means for moving the upper insulating member
15 transversely to the posts and relative to the lower
insulating member, whereby to engage or disen
gage the contact springs and the terminal posts
terminal posts.
oi the electrical device.
'
2. A terminal board for electrical devices hav
ing extending terminal posts, comprising a lower
insulating member receivingthe terminal posts
or the electrical device, an upper insulating mem
ber movably assembled on the lower insulating
member, wire terminal means on the upper in
sulating member, resilient contact springs at
tached to the wire terminal means and extend
ing downwardly to engage sides of the terminal
posts of the electrical devices, and means for
moving the upper insulating member transversely
30 to the posts and relative to the lower insulating
member.
8., In a terminal‘ board for electrical devices
having extending terminal posts, a ?rst insulati
ing member receiving the terminal posts, a sec
ond insulating member having wire terminal
connections and engagable with the terminal
posts by a movement of the second member rela
tive to the ?rst member and transverselsr to the
15
'7. In an electrical system, a device having
extending terminal posts, a ?rst member ?xed
transversely with respect to the alinement of the
terminal posts, a second member having wire ter
minal meansv engagable with the terminal posts 20
by a movement of the second member relative to
the ?rst member transversely with respect to the
alinement oi the terminal posts.
8. A detachable wire connecting means for ter- ' '
minal posts, comprising a ?rst'member ?tting 26
over the terminal posts. a second member
mounted to move on the ?rst member in trans
verse relation to the terminal posts, and wire
terminal means on the second member having re
silient contacts biased against the terminal posts 30
in accordance with the position of the second
member 01' the ?rst member.
)9. In an electrical system, a device having par
allel extending terminal posts, a ?rst member
?tting longitudinally over the terminal posts, a 35
means, resilient contact members carried by the . boss on the ?rst member ?tting longitudinally
wire terminal means of the, second insulating over one of the terminal posts, a second insulating
member having permanent wire connections, con
member, and means for moving the second‘ in
sulating member transversely to the posts and tacts attached to the wire connections and engag
able with the terminal posts by a movement of 40
relative to the ?rst insulating member in a man
ner to engage the contact members with the the second member transversely to the extending
terminal posts and relative to the ?rst member,
terminal posts.
'
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4. In a detachable terminal board for electrical
devices having extending terminal posts, a ?rst
and a bushing ‘carried by a terminal post 01' the
device and cooperating with the boss on the ?rst
member to permit installation 0! the ?rst member 45
over the terminal posts only in one relative posi
terminal posts, a second insulating member hav
tion.
'
ing wire terminal means, resilient contact mem
bers carried by the wire'terminal means of the Y 10. A detachable wire connecting means for
terminal posts, comprising a ?rst member ?tting
second insulating member, and means for mov
ing the second insulating member transversely over the terminal posts, a second member 50
to the posts and relative to the ?rst insulating mounted to move on the ?rst member in trans
verse relation to the terminal posts, wire terminal
member whereby to engage the contact .mem
insulating member having holes receiving the
bers'with the terminal posts.
-
5. In a detachable terminal board for electrical
55 devices having extending terminal posts, a ?rst
insulating member having holes ?tting over the
extending terminal posts, a second insulating
member slidably mounted on the mat ‘insulating
member, metal bushings in the second insulating
.0 member, screw means threaded into the metal
bushings ior attaching electrical‘ conductors, re
means on the second member having resilient
contacts biased against the terminal posts in ac~
cordance with the position of the second member 55
on the ?rst member, and means on a terminal
post engagable with means on the ?rstmember
for preventing improper installation of the ?rst
member over the terminal posts;
EDWIN _B. FAIRBANKS.
N
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