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Патент USA US2412968

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Dec. 24, 1946.
F, A_ cox I
2,412,968
RELAY
Filed Sept. 26, 1944
FIG. /
INVENTOA’
F A. COX
Byélé.
ATTORNEY
Patented Dec. 24-, 194i?
aliases
UNITED STATES PATENT 'OFFICE
2,412,968
RELAY
Francis A. Cox, Chatham, N. 3., assignor to Bell
Telephone Laboratories, Incorporated, New
York, N. Y., a corporation of New York
Application September 26, 191524, Serial No. 555,776
6 Claims.
(Cl. 175-336)
1
2
This invention relates to electric switching de
vices and particularly to electromagnetic relays
from the following description taken in connec
tion with the accompanying drawing in which:
Fig. 1 is a bottom plan view of a relay embody
ing the device of the invention;
Fig. 2 is a partial side elevation of the relay
for use in the circuits of telephone Systems.
In electric circuits generally, and in telephone
circuits particularly, electromagnetic relays are
employed in large numbers for performing nu
merous and varied circuit switching functions.
Certain of these functions require the use of slow
release relays which can be depended upon to
release between predetermined time limits. The
ideal relay for this purpose is one which, when
adjusted to given mechanical and electrical re~
quirements will meet the required release time
without further adjustment and when so ad
justed will retain this adjustment for a reason
showing the buffer spring;
Fig. 3 is a front end elevational view of the
relay disclosed in Fig. 1; and
Fig. e is a partial top view of the relay of Fig. 1.
The relay is in general of the type disclosed in
the above-identi?ed Swanson patent and has a
core l secured at its rear end to a mounting
bracket or heel-piece 2 and having a pole-piece
3 upon its forward end with which the forward
end of the armature 4 cooperates. An energiz
ing coil 5 surrounds the core I, the terminals of
A relay which meets this requirement to a cer
which are connected to lead-in wires ‘:3. A spring
tain degree is disclosed and claimed in Patent
pile-up is positioned on each side of the coil 5.
2,178,656, granted November 7, 1939, to P. W.
Each spring pile-up comprises any desired com
Swanson.
20 bination of contact springs. By way of illustra
able service period.
In this type of relay, however, owing to varia
tions in spring thickness, thickness of ?nish on
the armature and on the core and in the quality
of the iron employed, the tensions which can be
iuilt up in the contact springs when the relay op
erates are frequently insu?icient to permit meet
ing the release requirement. It has been pre
viously suggested that buffer springs be added to
the spring combinations to supplement the ten~
sion of the contact springs. These buifer springs
took the form of straight springs added to the
outside or the spring pile~up and were acted on
by studs carried by the armature. In addition
these buffer springs had to be tensioned against
the relay spool-head. Therefore, the efficacy of
such buffer
atmospheric
dependable.
dition for a
springs varied clue to Wear and to
conditions and were not completely
Furthermore, since the release conrelay may be alfected by magnetic
apparatus immediately surrounding it, buffer
springs of this type could only ‘be adjusted when
the adjacent circuits were idle.
In accordance with the present invention, a
buffer spring is provided which is free from these
undesirable features being independent of atmos
pheric conditions, substantially free from wear
and adjustable within a magnetic shield.
More speci?cally, this bulTer spring comprises
a C-shaped strip of spring metal, one arm an
choring the spring to an extension on the relay
core and the other arm pressing against the back
of the core, the latter arm carrying two lateral
prongs which embrace the core and extend slight
ly above it where they are engaged by the arma
ture at the end of its stroke. A screw mounted
on the end of the core passes through a slot in the
buffer spring and carries a nut by means of which
the tension exerted on the armature may be ad
justed.
The invention will be more readily understood
tion each spring pile-up has been disclosed as
comprising three active or movable springs ‘I each
having a mate or passive spring 8, two of which
are shown as front contacts and the other as a
back or normally closed contact. The armature
A is supported by means of hinge pins on an arma
ture bracket (not shown). The contact springs
'? and 8 are clamped to the bracket 2 by screws to
which are threaded into holes in the clamping
strips l5, the springs being insulated from each
other and from the bracket and clamping strips
by insulating strips such as strips it. At the for
ward end, the passive springs 8 have tabs 25
which engage in notches in the spool head 26.
For moving the armature springs i into or out
of engagement with their mate springs 8, upon
the attraction of the armature 4 towards the core
l in response to the energization of coil 5, the
armature is provided with operating studs lb‘ of
insulating material which engage the upper two
armature springs ‘i. The studs it in turn act
upon studs 13 which control the outer armature
springs.
To limit the releasing movement of the arma
ture, away from the core and to adjust the nor
mal air-gap between the armature and the pole
piece 3 of the core, a backstop screw ll having
a backstop nut 58 thereon is attached to a shoul
der 5 2 on the end of the core I . This screw passes
through the shoulder l2 and is held in place
thereon by means of a collar 9 and a lock-nut
l i, the lower end of the screw carrying a second
nut iii the purpose of which will appear herein
after. It is, of course, obvious that two screws
might be used, which could be fastened to the
shoulder l2 by any desirable means, for example,
by welding.
Anchored between the collar 9 and the shoul
der I2 is a buffer spring as. This spring is formed
of a rectangular strip of spring metal, the two
2,412,968
3
.
ends of which are recurved to form an .open
loop or C.
One of the recurved arms serves to
fasten the buffer spring in place, bearing on the
face of the shoulder l2 and having a slot 25 which
4
the end of its stroke, and means to vary the
tension placed on said prongs.
3. In an electromagnetic structure comprising
a cylindrical core having the forward end of its
cylindrical face ?attened to form a pole face,
an armature cooperating with said pole face and
passes around the screw i‘! and under the collar.
9 to permit secure anchorage. The other arm
22 is more sharply recurved and presses againstv ‘ an energizing coil on said core, an extension on
said core, a buffer spring, said buffer spring re
the underside of the core I by means of a tab
curved at each end to form two arms, one arm‘
23 bent at an angle to the arm 22. Formed in
tegrally with the arm 22 are two prongs 24 which 10 engaging said extension and the other arm press
ing against the bottom of said core, said other
are bent at right-angles to the surface of arm
arm having two lateral prongs bent to form a
22 and partially encircle the core l. These prongs
extend slightly above the pole-piece 3 and the
precise location is ?xed when the relay is assem
bled by varying the angle that the tab 23 makes
U embracing said core in position to be engaged
by said armature near the end of its stroke,
and means to vary the tension placed on said
prongs, comprising a slot in said buffer spring,
with the arm 22. In the base of the spring 29
is a slot 2? through which the lower end of screw
ll passes. Nut 59 threaded on the end of screw
ll acts upon the buffer spring 26 to control the
through said extension and said slot and a nut
tension of the spring and the position of the
4. In an electromagnetic structure comprising
a cylindrical core having the forward end of its
prongs 2t.
.
When the coil 5 is energized, attracting the
armature 1%, the armature ?rst performs its con
tact controlling functions and then, at the end
of the stroke, makes contact with the prongs 25
24 which exert a pressure thereon to assist in
starting the restoration of the armature under
the proper circuit conditions.
a screw fastened to said core and extending
on said screw acting on said buffer spring.
cylindrical face ?attened to form a pole face,
an armature cooperating with said pole face and
an energizing coil on said core, an extension on
said core, a screw passing through said exten
sion, a backstop for said armature threaded on
one end of said screw, a collar fastened to said
screw, a vbuffer spring, said buffer spring recurved
at each end to form two arms, one arm clamped
Since this buffer spring is attached directly to the core of the relay, it is not subject to posi 30 between said collar and the face of said exten
sion and the other arm pressing against the bot
tional changes due to atmospheric conditions.
tom of said core, said other arm having two
Prongs 2ft act directly on the armature it thus
lateral prongs bent to form a U embracing said
obviating the intervention of studs of insulating
core in position to be engaged by said armature
material, and consequent wear. Therefore the
point in the circuit where the armature fl engages 35 near the end of its stroke, and means to vary
the tension placed on said prongs.
the prongs Z4 and the initial tension may be
5. In an electromagnetic structure comprising
readily and accurately set and require little re
a cylindrical core having the forward end of its
adjustment during the life of the relay due to
cylindrical face ?attened to form a pole face, an
wear of parts.
armature cooperating with said pole face and an
A further advantage of this type of buffer
energizing coil on said core, an extension on .
spring lies in the fact that, since the tension
said core, a screw passing through said extension,
may be adjusted very accurately from the front
a backstop for said armature threaded on one
by means of the nut l9, it is possible to make
the adjustment while the relay is covered by a
end of said screw, a collar fastened to said screw,
magnetic shield, rendering the operation inde 45 a buffer spring, said buffer spring recurved at
each end to form two arms, one arm clamped
pendent of the circuit conditions of the adjacent
apparatus.
between said collar and the face of said exten
sion and the other arm pressing against the bot
What is claimed is:
1. In an electromagnetic structure comprising
tom of said core, said other arm having two lat
a cylindrical core having' the forward end of its 50 eral prongs bent to form a U embracing said
core in position to be engaged by said armature
cylindrical face flattened to form a pole face,
near the end of its stroke, and means to vary
an armature cooperating with said pole face and
the tension placed on said prongs, comprising
an energizing coil on said core, an extension on
a slot in said buffer spring, said screw passing
said pole face and a buffer spring, said buffer
spring recurved at each end to form a 0 having 55 through said slot, and a nut on said screw act
ing on said buffer spring.
two arms, one arm engaging the top of said ex
6. In an electromagnetic structurercomprising
tension and the other arm pressing against the
a cylindrical core having the forward end of its
bottom of said core, said other arm having two
cylindrical face ?attened to form a pole face, an
lateral prongs bent to form a U embracing said
core in position to be engaged by said armature (if) armature cooperating with said pole face and an
energizing coil on said core, an extension on
near the end of its stroke.
said core, and a buffer spring, said buffer spring
2. In an electromagnetic structure comprising
recurved at each end to form two arms, one
a cylindrical core having the forward end of its
arm engaging said extension and the other arm
cylindrical face ?attened to form a pole face, an
armature cooperating with said pole face and 65 pressing against the bottom of said core, said
other arm having two lateral prongs bent to form
an energizing coil on said core, an extension on
a U embracing said core in position to be engaged
said pole face, a buffer spring, said buffer spring
by said armature near the end of its stroke, said
recurved at each end to form a 0 having two
other arm also bent to form a tab, the angle
arms, one arm engaging the top of said extension
between said tab and said arm determining the
and the other arm pressing against the bottom
position of said prongs.
of said core, said other arm having two lateral
FRANCIS A. COX.
prongs bent to form a U embracing said core in
position to be engaged by said armature near
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