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Патент USA US2410325

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Oct. 29, 1946.
Original Filed Sept. 20, 1940
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Patented Oct. 29, 1946
Michel N. Yardeny, New York, N. Y.
Original application September 20, 1940, Serial
No. 357,660. Divided and this application Sep
tember 11, 1943, Serial No. 502,055
2 Claims.
(Cl. 175-372)
My invention relates to delayed action relays
magnet takes an appreciable interval of time, suf
and has particular reference to relays in which
?cient for many purposes for which delayed ac
tion relays may be used.
the movable part of the relay is retarded in its
My invention is more fully described in the ac
This is divisional application of my United Ul companying speci?cation and drawing in which:
Fig. l is a plan view of my relay;
States application, Serial No. 357,660, ?led Sep
Fig. 2 is a diagram of electric connections of a
tember 20, 1940, now Patent No. 2,342,717, granted
February 29, 1944. In this application, I disclosed
relay with two coils;
Fig. 3 is a fractional View on enlarged scale of
as a part of my electrical control system, a relay
in which the armature or movable part of the 10 the gummy layer.
My relay can be built in a variety of shapes and
relay moves rapidly toward the magnet part of
the relay when it is magnetized, thereby rapidly
closing the circuit of a motor by the relay con
tacts, but is released slowly when relay is demag
. netized, thereby allowing other parts of the con
types to suit different requirements, and in Fig. 1
is shown by way of an example a construction
which can be used with my invention. The relay
15 consists of an iron core I‘ with two coils or wind
trol system to attain stable condition of rest be
fore the motor is ?nally deenergized. Such de
layed action is particularly important and useful
when the motor in the system is stopped by dy
ings 2, 3 (although, of course, one coil can be used
ordinary quick-acting relay, the delayed action
being obtained by the simple expedient of apply
the switches l, 22, for instance, 2 I‘ with the main
gummy substance to the face of the relay mag
net and/or to the face of the relay armature. My
relay therefore, acts quickly when magnet is ener
gized, but because of high viscosity of the gummy
substance, separation of the armature from the 55
tracted to the core I, the layers l8 and I9 joining
each other. As a result, current from the battery
25 will ?ow through one of the reversing ?eld
if desired), with leads 4, 5, 4', 5’. An armature
6, also of iron, is mounted on a spring ‘I, rigidly
supported at 8. An insulation block 9 is fastened
namic braking or by other method in which cur 20 to the armature and engages a light spring l0
rent is required to accomplish the stopping. The
supported at I l and connected to a lead 12 of an
delayed action relay is used in such an arrange
electric circuit which is controlled by the relay.
Spring I0 is provided with a contact point l3
ment to deenergize the motor after electrical con-~
which engages a similar contact point M on an
ditions have been established for stopping the
other contact spring l5 supported on a post [6 and
motor. In my system, as described in the fore
having a lead [1, forming part of the controlled
going application, the motor is stopped when the
circuit. The contacting surfaces of the core I
control device, operated by the motor, reaches a
and armature 6 are provided with layers I8, [9 of
desired position in which a larger current is sent
through the system, and the increased current
a viscous non-drying gummy substance, such as
is used to trip the relay and, at the same time, to
solution of latex in kerosene, vinyl alcohol, emul
.ion of latex with protein glue, etc. which mate
stop the motor. It is evident that under such
rially retards separation of the contacting sur
condition it is essential that a certain interval of
time should elapse after the relay is deenergized
faces. Action of the gummy substance is more
to allow the motor to be completely stopped before
clearly shown in Fig. 3. The layers l8, l9 adhere
the current is shut oil" by the relay.
35 together when the armature B is attracted, and
when the core I is demagnetized, the gummy sub
The principle itself of delayed action relay is
not new but previously known relays of that type
stance breaks up into separate strings or ?la
ments 2!), gradually becoming thinner until they
were of rather complicated construction, involv
?nally break apart. This process of viscous
ing the use of dash pots and other mechanical
and electrical mechanisms to accomplish delayed 40 stretching of the ?laments consumes a certain
amount of time.
The high cost of such relays, as well as their
Such delayed action may be needed in a variety
relatively large sizes, render them unsuitable for
of applications to electric circuits, one of which
certain applications in which small and inexpen
is illustrated by way of an example inFig. 2. The
sive relays are required. With this object in view, 45 relay coils 2, 3 are wound in the opposite direc
have developed a delayed action relay which is
tions so that the core l is magnetized only when
of approximately the same size and cost as an
one of the coils 2, 3 is energized by closing one of
switch 23 also closed as well as a starting push
ing a layer of a non-drying viscous sticky or 50' button 24. The armature 6 then becomes at
windings 26, 21, and the motor will rotate in a.
corresponding direction. For stopping the motor,
the second switch 22 is closed thereby energizing
both ?eld windings and stopping the motor by
the opposing currents and electromotive forces.
As soon as the motor is stopped, however, it may
be desirable to disconnect the motor circuit even
if the switches are left closed. This is accom
plished by the provision of the two opposing relay
windings 2 and 3 which demagnetize the relay
core I when energized at the same time causing
the spirit of the invention, as set forth in the ap
pended claims.
I claim as my invention:
1. A delayed action relay comprising a sta
tionary member and a movable member, one of
the members being arranged to be energized for
causing mutual attraction between the members
while one of the members is energized, a portion
of each member being arranged to contact a cor
the motor circuit to be disconnected. It is very 10 responding portion of the other member in re
sponse to one of the members being energized,
and a layer of an adhesive viscous substance ap
plied to one of the contacting portions for re
tarding separation of the movable member from
the stationary member in response to deenergiz
important, however, that the motor should be
completely stopped by the opposing currents be
fore its circuit is interrupted, and the relay,
therefore, must be of delayed action type. This
purpose is satisfactorily accomplished by the use
of the adhesive cement I8, I9,
I have found that good results are obtained by
using a gummy substance prepared with rubber,
preferably latex dissolved in a non-evaporating
solvent, such as kerosene. A layer of such a
composition lasts under ordinary operating con
ditions for over a year, which is quite sufficient
ior ordinary purposes,
The layer, when it be
comes ineflective, can be easily repaired or re
newed by the application of fresh composition.
I have found that good results are obtained when
the thickness of such a layer is from about .010
to about .030 inch.
It is understood that my delayed action relay
may be further modi?ed without departing from 30
ing the energized member.
2. A delayed action relay comprising a sta
tionary electromagnet including a core and a
movable armature, means for energizing the elec
tromagnet for causing attraction between the ar
mature and the core while the electromagnet is
energized, the armature being arranged to con
tact the core in response to being attracted by
the core, and a layer of an adhesive viscous sub
stance applied to at least one of the contacting
surfaces for retarding separation of the arma
ture from the core in response to deenergizing the
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