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Патент USA US3048759

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Aug- 7, 1952
Filed March 2, 1959
2 Sheets-Sheet l
Aug- 7, 1962
Filed March 2, 1959
2 Sheets-Sheet 2
Q,‘ I,
trite ,
States atom
Patented Aug. 7, 1962.
strength of the current supplied does not exceed a certain
Gérard Noel Koehler, Saint-Cloud, France, assignor to
Compagnie des Machines Bull (Societe Anonyme),
Paris, France
Filed Mar. 2, 1959, Ser. No. 7%,693
Claims priority, application France Mar. 6, 1958
5 Claims. (*Cl. 317-165)
The invention therefore concerns an electromagnetic
relay comprising normal and off-normal contacts, a ?xed
magnetic yoke constituting with the magnetic core of the
electromagnet and a rigid armature resting on the said
yoke the magnetic circuit, in which the armature is main
tained against a bearing surface of the yoke by an initially
plane leaf spring and ?xed on one side to the said arma-=
The present invention concerns improvements in the 10 ture and on the other side to a supporting member fast
with the yoke in such manner that the said spring leaf
construction of low-power relays.
receives a certain ?exure well below vits elastic limit
Relays comprise, basically, an electric circuit which
includes a coil, a magneticvcircuit comprising a core, an
armature and a spring device which returns the armature
when the armature is in contact with its normal contact
or contacts.
For a better understanding of the invention and to
to the inoperative position, as also a system of contacts, 15
show how it may be carried into effect, the same will
some of which are closed when the coil is energized (off
now be described, by way of example, with reference
normal contacts), while the others are closed when the
to the accompanying drawings, in which:
coil is not energized (normal contacts). All these ele
FIGURE 1 is an elevational view of a relay according
ments should be so arranged as to ensure great safety
even ‘after prolonged operation, while being of simple 20 to the invention,
FIGURE 2 is a plan view of the relay,
construction. A large number of known constructions
‘FIGURE 3 is an elevational view of a part of the relay,
do not meet these requirements. It has been proposed
FIGURE 4 is a plan view corresponding to FIGURE 3,
in particular to employ coil springs as the return spring
FIGURES 5 and 6 are fragmentary perspective views
for the armature. This type of spring tends to oscillate
for some time after the triggering of its action and can 25 illustrating two modi?cations of the relay, and
FIGURE 7 is a perspective view of the relay.
consequently produce variations in the time of operation
In FIGURES l and 2 the illustrated relay comprises
and faulty contact-making. Flat springs supporting the
armature have also been proposed, but in this case the
armature was separated by an air gap from the ?xed
member supporting the said spring, which increased the
reluctance of the magnetic circuit. Pre-bent leaf springs
(bending by exceeding the elastic limit) have also been
proposed. This arrangement does not afford the same
length of service as a plane spring leaf operating below
its elastic limit. In addition, the adjustment of the pres 35
sure of the armature on its contacts has sometimes been
effected by modifying the bend of such a spring, which
could not give constant results.
In some constructions,
the magnetic circuit comprises defective joints between
the armature and one or more ?xed members of the said
circuit when the armature is in the inoperative position,
whereby the reluctance of the circuit is increased. With
the use of a pin joint or knife-edge joint, it is necessary
an external casing l, a movable armature 3, a return
spring 2, an energizing coil 4 wound around a magnetic
core 12, the latter being ?xed to a member '7 which forms
a yoke for the magnetic circuit and which is being ex
tended towards the left and secured to a pin shown at 13
in FIGURE 1 and at 24? in FIGURE 2. The lead-in
wires of the electric circuit are shown at 9, the lead-out
pins being the pins l8, 1% and it}, 2.1 (one pin being
designated by like references in FIGURES i and 2).
The relay comprises two ?xed double contacts 3a and
8b connected to the pins 17, 21 and 17, 19 respectively,
the ?rst through the member 16, and the second through
the member 14, which comprises a portion 14a. The
lower cheek of the frame 6 of insulating material of the
coil is extended to a point below the end of the member
4 anchored in the said frame so as to support the latter
with respect to the yoke 7, which serves as a level refer
pendicular to the movement in order to avoid jamming. 45 ence. The spring 2 is ?xed at the points 11 and 18, on
the one hand to the armature 3 and on the other hand to
This results in an ill-de?ned initial position of the arma
a member 5 screwed on the yoke 7 of the magnetic
ture, which causes dispersion in the operating times and
increases the danger of jamming of the armature at the
Referring now to FIGURES 3 and 4, which show the
levels of the contacts as a result of transfer of metal due
50 assembly consisting of the armature 3, the spring 2 and
to the electric arcs.
the member 5 before its introduction into the relay, it
Finally, the armature is sometimes connected to a
will be seen that the spring 2 is an initially undeformed
lead-out pin by a braid soldered over the said armature.
?at spring formed with a rectangular recess for receiving
This arrangement is not very practical.
the wider end of the armature, which recess may be
An object of the present invention is to devise a relay
of improved construction with a view to obviating the 55 formed simply by cutting in a thin sheet of appropriate
metal. The armature has two bent-over ends forming
foregoing disadvantages.
a fork, which are intended to come into contact with the
Accordingly, the return spring of the armature is a ?at
double contacts 8a and 8b. The armature is cut from an
leaf-spring, the attachment of which involves ?exure
iron strip plated with silver or other appropriate metal
well below its elastic limit. It is secured to the arma
ture, on the one hand, and to a ?xed member fast with 60 in such manner as to provide a silver-plated zone op
posite each contact. The surface of the armature is pro
a ?xed yoke of the magnetic circuit on the other hand.
tected by burnishing so as to leave the silver surfaces
The pressure of the armature on its normal contacts is
intact. When the member 5 is screwed on to the yoke
adjusted by bending the said ?xed member to a variable
7, the spring is ?exed, whereby the armature 3 is applied
extent. The armature is maintained in contact with the
said ?xed yoke of the magnetic circuit by the said flat 65 to the contacts 8a. The pressure of the armature 3 on
to allow the armature some freedom in the direction per
leaf spring, whereby the reluctance of the corresponding‘
the contacts 8a can be adjusted by deforming the portion
5a of the member 5 by means of pliers. Since the mem
joint is reduced. The electric circuit extends through the
ber 5 is thick, this deformation is completely stable.
armature, the ?at spring, the ?xed member to which the
When the relay is energized, the armature. 3 is attracted
spring is secured and the yoke of the magnetic circuit, so 70 by the core 12 in such manner as to reduce the reluctance
that a direct soldered connection between the armature
of the magnetic circuit, and the armature 3 comes into
and the lead-out pin is unnecessary, at least as long as the
contact with the contacts 81;. As soon as the energization
part and presenting a surface oblique with respect to said
armature, and a single leaf-spring which is initially plane,
for mechanically linking said armature and said surface,
of the electric circuit is interrupted, the spring 2 returns
the armature 3 to its inoperative position. When the
relay is to be used for closing a circuit when energized,
the ends of the said circuit must be connected to the
pins 18, 2t? and 17, 19. If the relay is to open a circuit,
the ends of the said circuit must be connected to the pins
13, 2t} and 17, 21. The utilization current is set up
through the pins 17, i‘) or 17, 21, as required, the con
tact 8a or Sb, the armature 3, the spring 2, the member
5 and the member 7, and the pin 18, 2G. In this con 10
struction, it is therefore unnecessary to provide a con
nection extending from the armature 3 to a lead-out pin,
said armature and spring having reciprocal forms such
that the spring is curved without permanent deformation
after an extremity thereof is secured to said bracket, in
such a manner that the curved pro?le of said spring sub
stantially lies in the prolongation of said fulcrum line.
2. An electro-mechanical relay as claimed in claim 1,
wherein said leaf-spring is made sufficiently conducting
so as to assure electrical linkage between said armature
and said yoke.
3. An electro-mechanical relay as claimed in claim 2,
the utilization circuit here extending through the spring
and a part of the magnetic circuit. In addition, the joint
wherein said bracket has an angle extension constituting
15 between the armature 3 and the yoke 7 is with cer 15 said oblique surface and permitting adjustment of the
tainty established by the pressure exerted by the spring
spring curvature.
2 both in the inoperative position and in the operative
4. In an electro-mechanical relay having an energiza
position of the armature. This assists in reducing the
tion coil, a magnetic yoke and an armature, an extremity
parasitic reluctance of the magnetic circuit. Finally, re
of which lies by a fulcrum line on a part of said yoke
ferring again to FIGURE 1, it will be seen that the ?exed
substantially parallel to the axis of said coil, in combina
surface of the spring 2 extends in immediate proximity
tion, a metallic bracket ?xed on said part and having
to the pivoting edge of the armature 3: on the yoke 7.
Therefore, when the armature 3 is attracted by the core
a member oblique with respect to said armature, and a
single leaf-spring initially uncurved ‘for electrically link
ing said armature and said yoke, said spring being adapted
12-, there is no horizontal sliding of the said armature 3
on the yoke 7, and consequently no tendency for the 25 to be non-permanently curved when an extremity thereof
contact 1.5 to become worn, While at the same time there
is fastened on said member, in such a manner that the
is no longitudinal friction which might impede the useful
curved pro?le of said spring substantially lies in the
prolongation of said fulcrum line.
movement of the said member 3.
‘FIGURES 5 and 6 illustrate two constructional variants
5. In an electrical relay comprising: a yoke in form of
of the spring. In FIGURE 5, the spring is a rectangular 30 an angle-member and of a core bearing an energization
plane leaf ?xed by rivets on the one hand to the member
5 and on the other hand to the armature 3, which com
coil, an armature an end of which lies on a part of said
angle-member which make up a fulcrum line and one
prises two bearing surfaces situated on either side of the
spring. In FIGURE 6, the spring comprises two arms
leaf-spring secured to said armature and to said yoke to
maintain said armature in return position, the improve
2a and 25 each fixed to two arms 5a and 5b of the mem
her 5, the attachment between the members 2 and 3 not
being illustrated in the ?gure.
The spring could consist of non-magnetic material such
as bronze and could be situated below the armature in
such manner that a residual air gap equal to the thickness
of the said spring is automatically maintained
the said
spring comes into contact with the core of the electro
magnet during the contact of the armature with the off
normal contact or contacts.
References (liter! in the ?le of this patent
Such an arrangement is
illustrated in FIGURE 5.
ment consisting in that said leaf-spring, which is initially
plane in released, free condition, has one end secured on
a lug fastened on said angle-member part, said lug being
located and obliquely oriented so that, after assembly,
said spring is curved while assuring ‘for itself the accu
rate position of said armature with respect to said yoke.
In addition, the spring may be simply soldered to the
Piifath ______________ __ Nov. 24, 1936
Price _________________ __ July 1, 1947
Great Britain _________ __ Mar. 7, 1929
I claim:
1. In an electro-mechanical relay having an energize
tion winding, a magnetic yoke, and an armature, an 50
extremity of which lies by a fulcrum line on a part of
said yoke extending laterally to said winding, the im
provement consisting of a bracket laterally ?xed on said
Telefonbau, German application Serial No. T5719,
printed 1956.
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