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Juiy 23, 1945.
‘
F. 5“ 111/0013
2,404,469
ELEG'Z‘ROMAGNETI G RELAY
Filed June 12, 1944
‘BFIG. I
INVENTOR.
FREDRIO E. wooo
.
BY.)
-
ATTORNEY?
2,404,469
Patented July 23,’ 1946
UNITED STATES PATENT OFFICE
2,404,469
ELECTROMAGNETIC RELAY
Fredric E. Wood, Oak‘ Park, Ill., assignor to Auto
matic Electric Laboratories, Inc., Chicago, 111.,
a corporation of Delaware
Application June 12, 1944, Serial No. 539,852
13 Claims. (Cl. 200—97)
1
2
The present invention relates in general to
electromagnetic devices and, more particularly, to
electromagnetic devices of the slow-to-release re
the usual residual screw would necessitate a hole ‘
lay type.
An electromagnetic device of the slow-to-re
lease relay type conventionally comprises a ?eld
structure including a core provided with a copper
sleeve and a winding, a movable armature carried
by the ?eld structure, and one or more sets of
in the armature thereby reducing the iron in the
armature near the core and thereby reducing the
efficiency of the relay. There is also another
reason for not using a residual screw due to the
fact that a residual screw is limited in size where
it strikes the core and is poundeddown by use
thereby losing its adjustment after a number
of operations and necessitating frequent read
switch springs operatively associated with the ar 10 justment. In accordance with the invention the
air gap between the armature and the core is
mature.
adjusted by means of a ?at armature stop spring
It is the object of the present invention to pro
mounted in the switch spring pile-up and an
vide an improved electromagnetic relay of the
adjustable stop nut. The stop nut is mounted
type described which is light in weight, diminu
tive in size, economical in construction, reliable, 15 on a threaded stud fastened to tho heelpiece of
the ?eld structure and the stud extends up
long wearing and positive in operation and in
through a hole in the armature stop spring. The
which the release time is very stable and does
adjustable stop nut may be screwed down against
not vary with any reasonable variation in volt
a washer, between the stop nut and armature
age or switch spring pressure.
stop spring, to position'the armature stop spring
Another object of the invention is the provi
so as to limit the armature stroke thereby vari
sion of means for easily and readily changing
ably adjusting the air gap between the armature
the release time of the relay without requiring
and the'core to provide the desired release time
a major readjustment of the relay and in which
of the armature. The washer is partially rounded
after such release time is once set it will be main
tained inde?nitely.
25 on one side so that the fulcrum point on‘ the
armature stop spring is not’changed when the
‘ The objects set forth above are in part realized
adjusting nut is screwed down. The adjustable
by providing a fairly large copper sleeve, or slug,
stop nut stays in the position set because of its
compared with the iron magnetic circuit in the
?bre insert which frictionally maintains it in
?eld structure and so that the iron in the mag
netic circuit is fully saturated by the counter 30 position. The flat armature stop spring is made
from spring tempered phosphor bronze and the
electromotive force generated by the copper sleeve
armature is chrome plated to present hard sur
when the circuit through the winding is opened
faces to prevent wear. The flat armature stop
after the winding has been energized at approxi
spring is slightly dished 'where the armature
mately one third of the normal operating volt
age. The copper sleeve, as is well known, due 35 strikes it to provide the same striking surface to
the armature regardless of the position to which
to this counterelectromotive force renders the
the spring is adjusted.’ The adjustable stop nut
relay armature slow-to-release in response to the
may be easily turned by using pliers or a wrench
interruption of current flow through the relay
to adjust the armature stop spring to the posi
winding. Due to this construction, normal volt
tion which gives the desired release time of‘the
age variations or changes in the spring tension
armature. Due to the special construction of
of the switch springs have very little, if any,
this adjusting nut, known commercially asan
effect on the release time of the armature. This
relay is, therefore, virtually independent of nor
elastic stop nut, the adjustment is maintained
mal voltage ?uctuations and switch spring ten
inde?nitely. ‘ If desired one or more relays may
sion for controlling the release time of the ar 45 be released in sequence to produce longer pre
mature. Also, due to this construction the relay
determined timed periods.
has only one variable factor by means of which
‘ The normal adjustment for certain release time
the release time of the armature may be varied
requirements is such that the armature arm
and that is by variably adjusting the air gap
should strike the ?at armature stop spring when
between the relay core and the armature.
Since 50 the armature is approximately one or two thou
sandths of an inch from the core. At this point,
this relay is of the diminutive type, being only one
and one quarter inches in length, it is too small
the armature stop spring, due to its short fulcrum,
greatly increases the spring tension tending to
prevent further operation ‘of the armature and
armature, such as shown in my Patent 2,272,496,
issued February 10, 1942. y In addition the use of 55 it is' this increasedspring tension, which is 'made
to have the usual standard residual screw in the
2,404,469
4
variable by the adjusting nut, in combination
with the air gap between the core and the ar
mature which determines the release time of the
armature.
_
It is also possible with this type of relay and
adjustment to adjust the armature stop spring
.
spring 26 and a ?at armature stop spring 29
arranged in superimposed relationship. The
switch spring 21 is also an armature restoring
spring and is provided with a bushing 4| which
is held against the armature arm projection I'Ia
so that the armature will release when the volt
by the tension in spring 21. Each of the springs
comprise a base end and a free end and is pro
age drops down to a predetermined value.
vided with a cantilever mounting at its base
Other objects and features of the present ‘in
end. Also, the springs are insulated from each
vention will be apparent by reference to the fol 10 other and from the clamping plate I9 at their
base ends. The arrangement for assembling and
lowing speci?cation taken in connection with the
accompanying drawing, in which:
insulating the ‘base ends of the spring set 25
comprises a clamping plate I9, the plurality of
Fig. 1 is a side view of an electromagnetic
relay constructed and arranged in accordance
with the present invention;
insulators 23, tubular insulators 24, an end plate
15 39, the individual springs 26, 21, 28, the armature
stop spring 29, and a retaining screw 3I. More
particularly, the retaining screw 3I is inserted
through the center tubular insulator 24 and
threaded into the tapped hole 34 in the clamping
Fig. 4 is an enlarged sectional View showing 20 plate I9 to securely clamp the springs and in
sulators between the clamping plate I9 and the
'the arrangement for pivotally supporting the
end plate 39 in assembled relationship, until it
relay armature;
is desired to fasten the spring set, by means of
Fig. 5 shows a partial cross section of the ad
mounting screws 32, upon the heelpiece I4.
justing means for adjusting the time release of
In order to assemble the spring set 25 upon the
the armature.
25
heelpiece I4, the bearing plate I8 is placed there
Referring now to the drawing, the electro
magnetic relay shown comprises a ?eld structure
on with the three clearance holes therein in
including a longitudinally extending core I2 pro
alignment with the three holes provided in the
heelpiece I4. The armature I5 is then held in
vided with a copper sleeve II and relay winding
place with the pivot pin 29, in engagement with
I3, a substantially L-shaped magnetic heelpiece
the pivot pin receiving slot 2| provided in the
I4, secured to the core I2 by means of screw III,
bottom surface of the clamping plate I9, as is
and a movable magnetic armature I5 pivotally
clearly shown in the enlarged view Fig. ll, and
mounted upon the outer end of heelpiece I4 and
the holes in plate I9 placed in alignment with
cooperating with the core I2.
As best shbwn in Figs. 1 and 3, the armature 35 the holes provided in the heelpiece I4 and the
I‘5 carries a pair of spaced-apart upwardly ex
bearing plate I8. Screws 32 are then inserted
tending ears Iii provided with aligned holes there
through the two outside holes in the end plate
in and an operating arm II. A pivot pin 29 is
39 and threaded into the tapped holes 33 in the
heelpiece I4 to securely fasten the spring as
inserted into the aligned holes and the outer
sembly 25, the pivot pin bearing plate IS, the
ends of the pivot pin 20 are ?anged over in order‘
armature I5, and the heelpiece I4 together
to rigidly secure the pivot pin 26 to the arma
into a unitary structure.
ture I 5. The operating arm I 1 extends along
In order to permit adjustment of the air gap
the side of the heelpiece and parallel thereto,
between the armature I5 and the front edge of
and is provided at the end thereof with an in
wardly extending operating projection Ila which
the heelpiece I4, slotted holes are provided in the
clamping plate I9 and the bearing plate l8, and
overlaps the upper surface of the heelpiece I4
and normally rests upon a nonmagnetic rivet 22,
the two outside tubular insulators 24 are provided
secured to and extending upwardly from the
with clearance holes therein which are slightly
greater in diameter than the diameter of the
upper surface of the heelpiece I4.
mounting screws 32.
In order to provide a bearing surface for the
Fig. 2 is a right end View of the relay illus
trated in Fig. 1;
Fig. 3 is an exploded perspective view of the
electromagnetic relay illustrated in Fig. 1;
pivotal armature, a nonmagnetic bearing plate
The switch springs 26 and 21 comprise a so
called make spring combination in which the
I8, formed of bronze or the like, is carried upon
armature spring 2'! is adapted to be moved into
the upper surface of the heelpiece I4 adjacent
engagement with the make spring 26. The gen
to the outer end thereof, and the pivot pin 29 is
rotatably held against the upper surface of the 55 eral shape of these springs are somewhat similar
bearing plate I8 in a transverse pivot pin re
to the springs shown in my previously mentioned
patent except that these springs are clamped in
ceiving slot 2i formed in the bottom surface of
the spring pile-up by a U-shaped portion of the
the clamping plate I9. The arrangement for
springs. In order to facilitate ease of adjustment
securing the armature I5 in pivotal relationship
with the heelpiece I4 and the core I2 will be 60 of the make spring 26, an L-shaped stop spring
28 is included in the spring pile-up, as indicated
described in detail hereinafter.
To facilitate assembly of the electromagnetic
in the drawing, to hold the make spring 26 a pre
determined distance from the armature spring 21,
relay, the switch spring set 25 is assembled in
The armature spring ‘El is provided with a
dependently of the relay structure itself, and,
after assembly, is secured to the heelpiece I4 65 relatively long, flexible portion to facilitate ease
together with the bearing plate I8 and the arma
of adjusting the pressure of this spring and bush
ing 41 against the operating projection Ila,
ture I5. With this arrangement different com
whereby minimum operating power is required
binations of switch spring sets may be carried
in stock by a relay manufacturer in order to meet
of the relay to overcome the tension of the arma
the customers’ requirements for different num 70 ture spring 2'! in order to move it into engagement
bers of springs as well as different combinations
with the cooperating make contact 26. The
of make and break switch springs.
armature spring 2'! is provided with an elongated
More particularly, the switch spring set 25
slot 36 formed therein adjacent the free end
comprises a plurality of individual switch springs
thereof, which slot provides the armature spring
26 and 21, an L-shaped back stop spring 28 for 75 with two spaced apart and independently ?exible
2,404,469
5
branches 31 and" 39 connected together at ‘the
free‘ end thereof by curved'operating portion 39.
The ?exible portions 31 and 38 of the armature
‘spring '21 each carry a metallic contact to co
operate with like metallic contacts on the Y
shaped ?exible arms 35 on make spring 26. Each
of the metallic contacts is welded to‘ its asso
ciated ?exible'portion of the springs at a’point
7thereto by spinning the side walls ‘of ?xture 40
into the bushing 4|. When the winding I3 is
energized, the armature l5 islrotated about the
pivot pin 20 in a counterclockwise direction as
viewed in Fig, 1, thereby causing the armature to
be moved from its normal position to its operated
position. The pivot pin 20 rotates in the trans~
verse pivot pin receiving slot 2| formed in the
bottom side of clamping plate l9, the adjacent
to insure self-equalization of contact pressure
10 upper surface of the bearing plate |8 serving also
between the engaging contacts.
as a bearing surface therefor. The operating
The armature switch‘spring 2Tand its coop
projection Ila carried by arm I‘! of armature l5,
erating make switch spring 26 are made quite
acts upon the bushing 4| and armature spring
?exible to maintain practically constant contact
21 to ?ex spring 21 to engage the associated make
pressure between ‘their circuit closing contacts
regardless of the position in which the'armature 15 spring contacts on switch spring 26.
The nonmagnetic rivet 22 underlying the pro
I5 is stopped. For example, the switch springs
jection Ila prevents the projection from sticking
26 and 2?,‘ after engagement, may ?ex a few
to the adjacent surface of heelpiece 4|, due to
thousandths of 'an inch, more or less, without ma
leakage of magnetic flux therebetween. In order
armature and without materially changing the 20 to prevent objectionable play between the pivot
pin 20 and the bearing surfaces, comprising
contact pressure ‘between the circuit closing con
the
transverse pivot pin slot 2| and the bearing
tacts. With this type of spring combination and
plate l8, when the entire relay is vibrated from
a back stop spring, such as spring 28', the stop
terially increasing the retarding effect on the
position of the armature l5 may be varied without
an external source, the relatively long ?exible
the necessity of altering the tension or positions 25 armature switch spring 21 and its bushing 4| is
tensioned against the upper surface of projection
of the switch springs as is now ‘commonly done
arm Ila between the point where the bottom sur
on other types of relays using such a spring com
face of arm |'|a rests upon rivet 2'2 and the point
bination.
where the arm |'| joins the projection Ila. The
The armature stop spring 29 is included'in the
spring pile-up in the position shown in the draw 30 rivet 22 acts as a fulcrum, so that pressure applied
to the upper surface of the operating projection
ing and has a hole ‘42 in its bent portion approxi
Ila at a point removed from the fulcrum tends
mately half way between its free end and the
to twist the armature l5, as is clearly shown in
point where it is clamped in the spring pile-up.
a slightly exaggerated form in Fig. 2. Conse
This hole is provided to enable the threaded
quently,
if there is any play between the pivot pin
stud 44 to pass therethrough for the‘purpose of
‘ 20 and the bearing surfaces indicated above, the
adjusting the free end portion of armature stop
armature switch spring automatically takes up the
spring 29. A slightly dished portion 43 of arma
play therebetween and thereby prevents vibration
ture stop spring 29 is dished as shown to provide
of the armature from an external source, either
a rounded'surface so that the projection arm
Ila always strikes the same surface when the 40 transverse to the axis of the pivot ‘pin or parallel
armature is operated regardless of the adjusted
position of the armature stop spring. The
threaded stud 44 is threaded into the heelpiece
l4 and is held in place by the stud nut 45. The
stud extends through the hole 42 in stop spring
29 and on top of spring 29 a washer 46 is placed
to the axis of the pivot pin.
In view of the fact that the armature switch
spring 21 applies its pressure to the operating
projection Ila at a point remote from the pivot
pin 29 and also ata point remote from fulcrum 22,
considerably less pressure is required to' overcome
any tendency of the armature IE to vibrate from
over the stud 44. The washer 46 is rounded some
an external source than would be required if the
what as shown so that when the elastic stop nut
pressure was applied directly to the pivot pin
41 is screwed down on the stud, the washer 45
does not change the fulcrum point. The elastic 50 itself, By actual test, it has been found that a
very small percentage of the pressure required at
stop nut 41 is hexagonally shaped at its base and
the pivot pin to prevent vibration of the arma~
ture, is required when the pressure is applied to
the operating projection |'|a at the remote end
has the usual threads for cooperation with stud
" 44. In addition the nut 45 has an upper rounded
extension in which a ?bre is placed and held by
friction. This ?bre insert has a hole through 55 of the armature I5 in the manner shown.
Having described the construction and as
which the stud 44 extends and which hole is just
sembly
of the relay, the utility and purpose of the
large enough to frictionally hold the nut on the
invention will be set forth to enable the same to
stud in its set position. The nut 45 may be
be more fully understood and appreciated.
screwed down or up to adjust the dished portion
It is well known that the provision of a copper
60
43 of armature stop spring 29 the desired dis
sleeve, such as sleeve. H, or a copper slug mate
tance before the projection arm Ila strikes it.
rially'effects the release time of the relay arma
The armature stop spring 29 may be adjusted to
ture
by the generation of a counterelectromotive
determine the point at which the projection arm
force when the circuit of the relay winding is
65 opened. It is known that the size of the sleeve,
or slug, is also a controlling factor in the release
ture |5 at this operating stage of the armature.
time of an armature. It is also common practice
At this point, the armature stop spring 29, due
to provide residual screws in the armature to
to its short fulcrum greatly increases the spring
maintain an air gap between the relay core and
tension tending to prevent further operation of
70 the armature when a relay of the slow-to-release
armature l5 toward the core l2.
type is energized to prevent the armature stick
In order to facilitate movement of the arma
ing, eithen permanently or, too long due to the
ture spring 21, a cup shaped metallic ?xture 49 is
so called residual magnetism. Relays of this type
welded to the lower surface of the operating
have proven satisfactory for, use in telephone ex
portion 39, An insulating bushing 4| is arranged
changes, vbut because of“ their‘ 'size',‘ ‘weight‘a'nd
‘within the ?xture 40 and ‘frictionally secured“
l'la strikes the dished portion 43 thereby deter
mining the air gap between the core I2 and arma
is
2,404,469
7
other characteristics have not proven satisfactory
for use in circuits used in airplanes. A small, or
termined point to thereby initially start the re
storing movement of armature I5. After the
diminutive, type of relay was therefore developed
armature has once started in its restoring move
for use in circuits or airplanes. Due to the small
ment it will continue to its unoperated position.
size of these relays, the use of a small residual CI
It should also be noted that the washer 46
screw for controlling the release time of the relay
has a partially rounded surface next to the ad
armature proved unsatisfactory because such
justing stop nut 41 so that regardless of the
small residual screws pounded out, thereby re
position of adjusting nut 41 the other surface of
quiring constant readjustment as well as reduc
washer 46 does not change the fulcrum point on
the armature stop spring 29.
ing the efficiency of the relay. It was necessary
to develop a diminutive slow-to-release type relay
which could be adjusted for different armature
release time periods, within certain limits, and
This relay has proven very satisfactory and has
met the requirements as to size, Weight and char
acteristics for use in airplane circuits and one
which will maintain its release time character
istics inde?nitely after once being set at the re~
quired time period. The release time may be
easily changed by using pliers or a small wrench
to turn adjusting stop nut 4‘! to in turn adjust
the free end 43 of armature stop spring 29 to the
one in which the desired release time period, after
once being set, would inde?nitely maintain its
adjustment, to meet the requirements for airplane
use.
In order to do this a small relay was de
signed which is virtually independent of normal
voltage ?uctuations and switch spring tension for
controlling the release time of the armature, and
20
position which gives the desired release time.
one in which the only variable factor by means
Having fully described the invention, what is
of which the release time of the armature may be
considered new and desired to have protected by
Letters Patent is speci?cally pointed out in the
varied, is the means for adjusting the air gap be
following claims.
tween the relay core and the armature. This
What is claimed is:
relay is provided with a fairly large copper sleeve 25
1. In a relay comprising a relay core, an L
I I compared with the iron in the ?eld structure
shaped heelpiece secured to said core at its L
comprising the core I 2, heelpiece I4 and armature
shaped base portion and having an upright por
I5. The amount of iron in the magnetic circuit
tion extending in a plane parallel with said core,
of this ?eld structure was carefully chosen so that
the iron in the magnetic circuit is fully saturated :30 an armature movably mounted on said upright
portion of said heelpiece and having a portion
by the counterelectromotive force generated by
extending over said core for completing the mag
the copper sleeve II when the circuit through
the winding I3 is opened after winding I3 has
netic circuit of said relay, an arm integral with
been energized at approximately one third the
said core portion of said armature extending from
said core portion parallel with said upright por
normal operating voltage. Due to this arrange
tion of said heelpiece towards said base portion
ment the release time of the armature is virtually
of said heelpiece, a projection arm integral with
independent of normal voltage ?uctuations or
and extending at right angles from said arm
changes in the switch spring tension of armature
switch spring 21 and make switch spring 25.
portion of said armature across the base portion
In order to vary the release time of armature M of said heelpiece, a spring pile-up including an
armature switch spring having a bushing ten
I5, an armature stop spring 29 is provided in
sioned against and engaging said projection arm
the spring pile-up and an adjusting nut 41 is
provided for adjusting the free end 43 of arma
at one point for maintaining said armature in
ture stop spring 29. When the winding I3 is
its released position, an armature stop spring in
energized the armature I5 is operated toward the 45 cluded in said spring pile-up having a free end
core, the tension of armature spring 21 having
extending over another point of said projection
very little, if any, retarding effect on operation
arm .and in the operating path of said projec
of the armature I5, until such time as the pro
tion arm, and means adjustably secured to said
jection arm I ‘Ia of armature I5 strikes the dished
heelpiece for adjusting the distance between the
portion 43 of armature stop spring 29. At this 50 free end of said armature stop spring and said
point, due to the short distance between 43 and
projection arm for variably stopping said arma
the hole 42, located at the fulcrum point of arma
ture thereby variably adjusting the air gap be
ture stop spring 29, the armature projection arm
tween said core and said core portion of said
I la encounters greatly increased spring tension
armature when the relay is energized to change
tending to prevent further operation of armature 55 the release time of said armature.
I5 towards the core I2. Due to the adjustment
.2. In a relay comprising a relay core, a heel
of armature stop spring 29 and its tension, such
piece secured to said core, an armature movably
spring may be in such a location as to prevent
the armature I5 from actually coming in con
mounted on said heelpiece for cooperation with
said core and for completing the magnetic circuit
tact with the core I2 thereby leaving an air gap 60 of said relay, a spring pile-up including a make
between armature I5 and core I2.
As is well
known, the greater the air gap, the quicker the
armature will release and since this air gap is
made variable by adjusting the stop nut 41, the
release time of armature I5 may be varied.
Depending upon the magnetic pull on the ar- '
mature, the armature stop spring 29 may bend
only slightly dependent upon the tension of spring
switch spring and an armature switch spring, a
back stop switch spring intermediate said make
and armature switch springs for normally main
taining said make switch spring out of engage
ment with said armature switch spring, a projec
tion arm on said armature for operating said
armature switch spring into engagement with
said make switch spring to complete an electric
29 fromits fulcrum point to its free end 43 and
circuit in response to the operation of said arma- '
this slight movement of the armature may per 70 ture, an armature stop spring included in said
mit actual engagement of the armature I5 with
spring pile-up having a free end located in the op
core I2. However, even in this case, the spring‘
erating path of said projection arm, and means
29 exerts su?‘icient pressure to break the arma
adjustably secured to said heelpiece for adjust
ture I5 away from the core I2 when the so called
ing the distance between the free end of said
residual magnetism has died down to a prede 75 armature stop spring and said projection arm for
10
9
variably stopping the said armature thereby var
iably- adjusting the air gap between said core and
armature when the armature is operated to
change the release time of said armature.
3. In a‘ relay comprising a magnetic structure
including a relay core, a heelpiece and an arma
electric circuit, av projection arm integral with
saidarmature for controlling said switch springs
when the armature is operated, an armature stop
spring included in said spring pile-up and having
a free end extending over and in the operating
path of said projection arm, an adjusting nut
having an insert for maintaining said nut in its
ture, a spring‘pile-up including switch springs
last adjusted position, saidadjusting nut being
for controlling electric circuits, said armature
manually adjustable-for adjusting-the distance
pivotally mounted on said heelpiece for coopera
of said free end of said armature stop spring. from '
10
tion with said relay core and having a projection
saidprojection arm to limit the operating stroke
arm for controlling said switch springs included
of said armature-when, the armature is operated
’ in said spring pile-up, an armature stop spring
in response to the energization of said relay, and
included in said spring pile-up and having its
a dished shaped. portion on said free end of said
free end extending in the operating path of said
projection arm, and an adjusting nut for adjust 16 armature stop spring presentingthe same rou'nded
striking surfaceto. said projection arm regardless
ing the distance of the free end of said armature
of the adjusted. position ofsaid ‘armature sto
Stop spring from said projection arm to limit the
operating stroke of said armature when the ar
8. In a relaycomprising a magnetic structure
mature is operated.
including
a relay core, a heelpiece and an arma
4. In a relay comprising a magnetic structure 20
ture movably mounted onsaid heelpiece, switch
including arelay core, a heelpiece securedto said
springs,.a projection armintegral withsaid arma
core, an armature movably mounted on said heel
turefor
controlling said switch springs,.an arma
piece, and a spring pile-up secured to said heel
turestop‘spring located in the operating path of
piece including switch springs for controlling an
electric circuit, one of said switch springs having 25 saidprojection- .armior. limiting the operating
strokeof saidiarmature towards saidcore,.means
a free end operatively engaging said armature at
for operating. said armature, and means for ad
one point for controlling said switch springs when
justi'ngthe distance between said armature stop
the armature is operated, an armature stop spring
spring and said'projection arm for variably stop
included in said spring pile-up and having a free
end extending over and in the operating path of 30. pingsaid armature before it reaches said core
thereby variably- adjusting the air gap between
said armature at another point of said arma
said~ armature. andsaid core, when the armature
ture, and an adjusting nutfor adjusting the dis
is operated .to variably ‘adjust the release time
tance between said free end of said armature stop
spring and said armature to limit the operating
9. Ina relay. comprising a. magnetic structure
stroke .of said armature when the armature is 35
sprmg.
_
of saidarmature.
>
-
a
.
,
-
,
including, a relay core, a heelpieceand an arma
operated.
'
,
,.
5. In a relay comprising a magnetic structure
including a relay core, a heelpiece secured to said
core, ‘switch springs secured to said heelpiece,
ture.‘v movably' mounted on- said, heelpiece, an,
armaturestop spring having .a base. portion
secured to saidheelpiece andhaving a free end»
‘and an armature movably mounted 0n said heel 40 locatedinthe operating path of said armature,
an adjusting nut located at a point intermediate
piece, one of said switch springs having a free
the base portion and the free end of said arma
end opei‘atively engaging said armature at one
point for controlling the operation of said switch
‘springs when the armature is operated, an arma
ture stop spring‘ for variably adjusting the free
end of said armature stop spring variable dis
ture stop spring mounted on said heelpiece and 45 tances away from said armature to limit the oper
ating stroke of said armature towards said core
having a free end extending over and in the op
to thereby vary the air gap between said core and
erating path of said armature at another point of
said armature when the armature is operated,
said armature, and an adjusting nut for adjusting
and a washer having a semi-rounded surface
the distance between said free end of said arma
ture stop spring and said other point of said 50 located between said adjusting nut and said
armature stop spring for maintaining the same
armature to limit the operating stroke of said
fulcrum point at said intermediate point on said
armature when the armature is operated.
armature stop spring regardless of the adjusted
6. In a relay comprising a magnetic structure
position of said armature stop spring and said
including a relay core, a heelpiece secured to said
'
core, an armature movably mounted on said heel 55 adjusting nut.
10. In a relay including a relay core and a heel
piece, and a spring pile-up secured to said heel
piece secured thereto; a unitary assembly com
piece including switch springs, a projection arm
prising a plurality of circuit controlling contact
integral with said armature for controlling said
switch springs separated by insulators one of
switch springs when the armature is operated,
an armature stop spring included in said spring 60 which is an armature restoring spring, a back
stop spring for normally maintaining another of
pile-up and having a free end extending over and
said switch springs from engagement with said
in the operating path of said projection arm, an
armature restoring switch spring, an armature
adjusting nut having an insert for maintaining
stop spring, and a clamping plate; an armature
said nut in its last adjusted position, and said
adjusting nut being manually adjustable for ad 65 and a pivot pin therefor, means including said
clamping plate for providing a bearing for said
justing the distance of said free end of said arma
pivot pin, means for securing said unitary assem
ture stop spring from said projection arm to limit
ably to said heelpiece to rotatably secure said pivot
the operating stroke of said armature when the
pin in said bearing, an arm on said armature be
armature is operated in response to the energiza
70 ing engaged at one point by a bushing on the free
tion of said relay.
end of said armature restoring switch spring, a
'7. In a relay comprising a magnetic structure
free end of said armature stop spring extending
including a relay core, heelpiece secured to said
core, an armature movably mounted on said heel
piece, and a spring pile-up secured to said heel
over another point of said arm, a threaded stud
secured to said heelpiece, and an adjusting nut
piece including switch springs for controlling an 75 cooperating with said stud and manually opera
2,404,469
11
tive to adjust the free end of said armature stop
spring variable distances from said other point
of said arm to thereby vary the air gap between
the armature and said core when thearmature is
operated towards said core in response to the en
ergization of said relay.
11. In a relay including a relay core and a heel
piece secured thereto; a unitary assembly com
prising a plurality of circuit controlling contact
switch springs one of which is an armature re
storing spring, an armature stop spring, and a
clamping plate separated by insulators; an arma
12
to the opening of the circuit through-said relay
winding after said winding has been energized
by approximately one third the normal operat
ing voltage of said relay thereby rendering the
release time of said armature unaffected by nor
mal voltage ?uctuations through said relay wind
ing, and an adjusting nut adjustably secured to
said heelpiece for adiustably limiting the oper
ating stroke of said armature towards said relay
10 core when the relay winding is energized in order
to vary the air gap between said armature and
said core to thereby vary the release time of said
ture and a pivot pin therefor, means including
armature when said counter-electromotive force
said clamping plate for providing a bearing for
is generated by said sleeve in response to opening
said pivot pin, means for securing said unitary 15 the circuit through said relay winding.
assembly to said heelpiece to rotatably secure said
13. In a relay comprising a relay core, a heel
pivot pin in said bearing, a bushing 0n the free
piece secured to said core, an armature movably
end of said armature restoring switch spring en
mounted on said heelpiece for completing the
gaging said armature for operating thereby, a free
magnetic circuit of said relay, a ?exible arma
end of said armature stop spring located in the 20 ture switching spring tensioned against an oper
operating path of said armature, a threaded stud
ating arm of said armature, a back stop spring,
securedto said heelpiece, and an adjusting nut
a ?exible make switching spring tensioned against
cooperating with said stud and manually opera
said back stop spring and held out of engagement
tive to adjust the free end of said armature stop
with said armature switching spring by said back
spring variable distances from said armature to 25 stop spring, means for operating said armature
thereby vary the air gap between the armature
to flex said armature switching, spring into en
and said core when the armature is operated
gagement with said make switching spring and
towards said core in response to the energization
to ?ex said make switching spring a variable dis
of said relay,
tance away from said back stop spring dependent
12. In a slow-to-release relay comprising a 30 upon the operating stroke of said armature, and
magnetic structure including a relay core, a heel
an armature stop spring adjustable to various
piece and an armature, a relay winding for oper
stop positions to stop said armature variable dis
ating said armature, and a copper sleeve around
tances away from said relay core to change the
the relay core for retarding the release of said
release time of said armature without effecting
armature when the circuit through the relay
the operate time of said armature and without
winding is opened, the amount of iron in said
appreciably changing the contact pressure be
magnetic circuit and the size of said copper sleeve
tween the armature switching spring and the
being so proportioned that said magnetic circuit
make switching spring.
is fully saturated by the counter-electromotive
FREDRIC E. WOOD.
force generated by said copper sleeve in response 40
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