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Патент USA US2111543

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March 22, 1938.
2,111,543
G. c. ARMSTRONG
RELAY
Filed Nov. 21', 1955
i’z‘y. 2.
435
37
76
WITNESSES:
INVENTOR
BY
' ATToRmg/U
F’atented Mar. 2'2, lg?ti
UNITED
293119543
George £0. Armstrong, Forest Hills, Paw aesignor
to Westinghouse Electric 8; lliannifacturing
(Tompany, East
Fa,
corporation
of Pennsylvania
Application November fill, 1935, Serial No. 5119,5365
id @lairns. (@i. ZiDiDm-ilii)
' This invention concerns a time-delay relay, in
held by a shoulder rivet. On the other side of
which the delay mechanism is operated by the
action of alternating flux upon a rotatable body
the side members and they are secured by rivets.
" pivot bolt, laminations ?ll the space between
A more
The armature laminations do not extend all the
5 detailed discussion of the principles acting in
such an air gap will be found in my co-pending
way to the pivot bolt, but as indicated at it, they
stop short of the length of the arm of the side
members. The portions of the side members
which contact the laminations of the armature
are equipped with flanges 20 and 2 i. Between the
side members I15 is mounted a contact carrying
member 2%. At the pivotal end, this contact
carrying member is bifurcated'to provide a stir
rup 26 which extends past the pivot pin. 94, and
in an air gap of the magnetic circuit.
application, Serial No. 46,287, ?led October 23,
1935.
-
.
It is an object of this invention to provide a
10 less expensive and more positive action of the
delay mechanism than is found in time-delay re
lays heretofore known.
It is a further object of my invention to pro
vide a screw mechanism‘operated by the fi *1; in
15 the air gap and acting to produce a thrust for
controlling the delay mechanism.
Other objects of my invention and details of
the structure will be apparent from the follow
ing description and the accompanying drawing,
20 in which:
Figure 1 is an elevational view of the relay look
ing toward the side upon which the armature is
pivoted;
Fig. 2 is a top plan view of the same relay;
Fig. 3 is a view looking toward the bottom of
Fig. 1;
Fig. 4 is a circuit diagram illustrating the use
of such a relay; and
Fig. 5 is a detail view in perspective of a por
:30
tion of the relay.
'
The relay includes a magnetic circuit compris
ing a stationary part I and an armature 2. The
exert a bias upon the member 25.
A similar
stud 35 pierces the member I2 and the stirrup I l
and is headed at 33. It bears a spring 31' con
?ned between two collars and secured by a cotter
pin 38 which biases the detent member I2 to the
illustrated position. The member I2 is equipped
with a laterally extending portion 40, which is
perforated to afford passage to a rod 4 I . This rod
is preferably integral with a screw 43, and an
abutment ?ange 44 is preferably integral with
both. The screw 43 is equipped with a nut 45
and a jam nut cooperating therewith. In the
circuit is equipped with a coil 3 intended to be
energized by alternating current, and the arma
illustrated position, the nut 45 bears against the
side member 5' and limits movement of the screw
ture is supplied with a shading coil 4 in order
43 downward as seen in Fig. 1. The side member
5’ upon the upper side of the laminations, as seen
that it may respond effectively to the alternating
current. The stationary part of the magnetic
circuit is laminated and provided with brass side
plates 5 and 5’ having feet. On the upper side,
the plate 5 is extended to form an angle member
I0, which is integral with a stirrup II, in which
a detent member I2 is mounted.
The station
ary portion I of the magnetic circuit comprises
a portion 8 mounted on the base ‘I and two por
. tions 9 and 9’ extending toward the armature.
The side members 5 and 5' are widened be
yond the laminated structure to provide ears I3,
in which is mounted a pivot bolt I4. The arma
ture is mounted upon this pivot bolt by means
50
each bifurcation is perforated to afford a bear
ing on this pin.
Above the flange 2i the contact carrying mem
ber 25 is perforated to provide room for a stud
2i which is headed below the flange, as shown at
28, and carries a spring 29 con?ned by collars and
a cotter pin 30 which causes the spring 29 to
of non-magnetic side members I5. The side
members I5 are traversed by the pivot bolt I4,
and on one side thereof are extended to form a
tail piece whichin the open position of the ar
mature stops against the stationary magnet mem
55 ber 9', and are spaced by a spacer I 6, which is
in Fig. 1, is provided with an ear 46 to provide
this abutment! The screw 43 extends through
.the air gap between the upstanding portion 9'
of the magnetic circuit, and the lamination end
I8 of the armature. The pole face I9, which is‘the,
end of portion 9’, extends from the lower edge 50
as shown in Fig. 3 to the upper edge 5 I. When the
screw 43 extends through the air gap between
the pole face I 9 and the pole face I8, it rests upon
the pole face I9. This screw is biased toward the
lefthand position, as shown in Fig. 2, by the
spring 55. (See Fig. 5.) The spring 55 is mounted
on the foot 6 of the lower side member 5 as seen
in Fig. 1 and is equipped with a laterally extend
ing portion 56 shown in dotted lines in Fig. 1,
which will engage the lower face of the member
9' of the magnetic circuit and so limit the move
ment of the spring. The spring 55 is equipped
with a bearing block 60 (see Fig. 5), which is pro
2
2,111,543
vided with threads to cooperate with the threads
of the screw.
-
.
A spring BI is wound upon the upper end of the
pivot bolt l4 and secured at its left-hand end, as
shown in Fig. 1, in a groove in the head of the
rivet I6. Its other end is hooked around the side
that it is lower than the illustrated position of
Fig. 1, the disengagement will occur later. The
length of the screw 43 is such that soon after the
?ange 44 engages the lateral projection 40, and
the contacts have closed, the screw 43 will dis
engage the block 50. When this occurs, the spring
member 5' and its action isto bias the armature
2 to open position. The armature 2 carries a cam
55 will cease to exert any bias upon the screw 43
and the rotation which resulted from the com
member 62 secured to the underside of the ?ange
bined action of several causes, including this
spring 55, as noted above, will cease. The screw,
therefore, will cease to rotate. The spring 55, be
ing now free from the screw 43, moves until the
stop 56 hits against the member 8'. In the result
ing position the spring “and block 50 hold the
screw from retuming under gravity to the posi 15
tion of Fig. 1.
When the coil 3 is deenergized, the armature 2
is moved to open position by the action of the
spring 5|. During this motion, the end 64 of the
10 2| by means of a bolt 53. The end 54 of the cam
member 62 is curved upwardly to contact the
screw 43 when the armature 2 moves to open cir
cuit position and push the screw 43 out of engage
ment with the block 60 on the spring 55, as sub
15 sequently described in detail.
The distal end of the contact carrying member
25 is curved to afford a‘ contact 55. This cooper
ates with a stationary contact 86 mounted upon
any suitable insulating support. The contact
carrying member 25 at times carries current and
it is desired to provide a connection for such cur
rent around the bearings on the pin I4 in order
to avoid heating of said bearings. For this pur
pose a ?exible conductor omitted in Fig. 2 is
secured in the hole 61 upon the member 25 and
under the head of pivot II or to any point elec
trically continuous with side member 5.
In the operation of the device, the coil 3 is en
ergized with alternating current, which has the
30 effect of attracting the armature 2 and of setting
up an alternating ?ux between pole face I! and
pole face I9. The screw 43 is thus subjected to
an alternating magneto-motive force, and be
cause of its own hysteresis, the polarities estab
35 lished therein have a somewhat di?erent phase
from the polarities established upon the pole
faces 19 and IS. The combined effect of this
hysteresis, the action of the spring 55 and the
alternating magneto-motive force in the gap
|9--l8 causes the screw to rotate, clockwise as
seen in Fig. 3. This action is further explained
in my above mentioned copending application.
When the screw rotates, there is coaction between
the threads of the screw and the threads of the
block 60 causing the screw to travel upward as
seen in Fig. 1.
The attraction of the armature 2 causes it to
move completely into contact with the portion
9’ of the magnetic circuit, but the contact carry
ing member 25 will not at first travel as far as
cam 52 engages the screw 43 and moves it upward
as shown in Fig. 3, which is toward the left, as
shown in Fig. 2. The spring 55 being now in the
position‘ in which the contact of stop 40 with
member 5 placed it, the cam 62 does not release
the screw 43 from resting upon the spring 55
until the cam has moved the screw beyond this
position of the spring, that is, until the armature
2 has been moved by spring 6| nearly to its com
pletely open position. The screw 43 will then fall
under the action of gravity to the position illus
trated in Fig. 1. Obviously, a bias other than
gravity for returning the screw 43 may be pro
vided and the relay may then be used in other
than the position illustrated in Figs. 1 and 2.
An illustration of the use of this relay is shown
in Fig. 4 which shows a three-phase supply circuit
‘I0 for energizing a motor illustrated in a con
ventional way at ‘H.
A familiar form of switch
is shown at 12, which is operated by the action of
a push-button 13. When operated, it establishes 40
a holding circuit for itself at 14, which may be
opened by a push-button ‘I5. When the motor is
first started by pushing the button 13, its sec
ondary circuit includes a resistor 16.
The ener
gizing coil 3 of a relay of the type described above 45
is connected across a primary winding of the
motor, which will cause the armature 2 to move
to closed position, but the contacts 65 and 65 will
not close until after the lapse of a predetermined
time. At the end of this time, the pin 4| will have 60
ascended so far that the abutment 44 will have
this. It will be arrested by contact between it and
the distal end of the member l2. After this, there . moved'the detent I2 to release position and then
is relative movement between the contact carry
the spring 30 will cause the contacts 55 and 56 to ,
ing member 25 and the armature 2 causing a close. When they close, the coil 11 will be ener
separation between them, best illustrated in‘ Fig. gized, which will close the contacts that remove 55
3. This relative movement compresses the spring the resistance 15 from the secondary circuit of the
29, the stud 21 having been m?ed by movement motor.
of the armature while the member 25 was stopped
Many variations in the mechanical details
by detent I2.
shown and described will occur to those skilled
As the screw 43 moves upward, the ?ange 44 in the art, and I desire, therefore, that only such 60
comes into contact with the lateral projection 40 limitations shall be imposed on my invention as
upon the detent member l2 and presently moves are indicated in the appended claims.
the detent against the action of the spring 31
I claim as my invention:
until the end of it ceases to contact the contact
1. In a time-delay relay, a magnetic circuit
' carrier 25. When this occurs, the contact’ carrier
moves under the action of spring 29 and brings
the contact 65 against the contact 55. This will
not occur until some time after the coil 3 is first
energized.
70
The length of this time is adjusted by adjusting
the nut 45 on the screw 43. If this is so adjusted
that the screw 43 is originally in a higher position
than that illustrated in Fig. 1, the disengagement
between the detent i2 and the contact carrying
75 member 25 will occur sooner. If itis adjusted so
comprising a magnetizable structure and an ar
65
mature movably related thereto, a contact-carry
ing structure yieldably constrained to move with
said armature, a detent for said contact-carry
ing structure, means for energizing said mag
netic circuit with alternating ?ux, said magnetic 70
circuit having an air gap between said magnet
izable structure and said armature, a magnetic
body pivotally mounted within said air gap for
movement therein, and a device operated upon
the energization of said magnetic circuit and of
gym (a 1
said magnetic body for moving said detent to
release position.
2. In a time-delay relay, a magnetic circuit
6:3
structure having a stationary and a movable
structure and an air gap between them, a screw
threaded body in said gap-cooperating with ‘one
comprising a magnetizable structure and an ar~ , face thereof, a spring biasing said member away
mature movably related thereto, a contact»car
from the other face of said gap, a threaded bear
rying structure yieldably constrained to move ing block‘. mounted on said spring and cooperat
with said armature, a detent for said contact-car~ ing with the threads on said body, means for
rying structure, means for energizing said mag
biasing said movable structure to a predetermined
netic circuit with alternating ?ux, said magnetic position, and means responsive to such biased
circuit having an air gap between said magnet
movement of said movable structure for disen 10
izable structure and said armature, a magnetic gaging said screw-threaded body from said hear
body in said air gap, a spring biasing said body
away from one face of said gap, whereby said
body will rotate when the magnetic circuit is
thus energized, means for obtaining a translatory
movement from said rotation, and means oper
ated in accordance with said translatory move
ment for moving said detent to release posi
tion.
20
.
'
3. In a time-delay relay, a magnetic circuit
comprising a magnetizable structure and an ar
mature movably related'thereto, a contact-car
rying structure yieldably constrained to move with
said armature, a detent for said contact-carrying
[0 Cir structure, means for energizing said magnetic cir
cuit with alternating ?uxfsaid magnetic circuit
having an air gap between said magnetizable
structure and said armature, a threaded body in
said air gap, a spring biasing said body away
30 from one face of said gap, whereby said body
will rotate when the magnetic circuit is thus
energized, said spring carrying threads cooperat
ing with the threads of said body to cause trans
lation thereof upon said rotation, and means ac
35 tuated in accordance with said translation to
move said detent to release position.
4:. In a time-delay mechanism, a magnetizable
structure having an air gap, a member mount
ed to have motions of both rotation and trans
40 lation in said air gap, means for energizing said
magnetizable structure with alternating ?ux, a
yieldable biasing means cooperating with said
member to cause rotation and translation thereof
‘when the magnetizable structure is energized,
and a thrust member controlled in accordance
with the motion of translation of said ?rst
named member.
5. In a time-delay relay, a contact controlling
member, a detent normally preventing said mem
50
ber from moving completely to contact-closing
position, screw-threaded means for moving said
detent to inoperative position, and means for
moving said contact~controlling member to con
tact-closing position, said two means having a
55 common magnetic circuit.
6. In a time-delay relay, a contact-controlling
member, a detent normally preventing said mem
ber from moving completely to contact-closing
position, means for moving said detent to release
60 position, and means for moving said contact
controlling member to contact-closing position,
said two means having a common magnetic cir
cuit having two air gaps one of which is short
ened to effect the movement of the contact-con
65 trolling member and the other is of a length
which changes to a. less degree during the move
ment of the contact-controlling member, the
means for moving the detent including a mag
netic body in the last-mentioned air gap.
7. In a. time-delay mechanism, a magnetizable
70
ing block.
8. In a time-delay relay, a magnetic circuit
comprising a magnetizable structure and an ar
mature, an air gap between them, a magnetic
screw-threaded member in said air gap, a spring
pressed threaded member biasing said magnetic
member away from one face of said gap, and
means carried by said armature and acting upon
the deenergization of the magnetic circuit for 20~
moving said magnetic screw-threaded member
beyond the range of movement of the spring
pressed threaded member, whereby upon said
deenergization the magnetic screw-threaded
member will be free to be moved by gravity.
25
9. In a time-delay relay, a magnetic circuit
comprising a magnetizable structure and an ar
mature, an air gap between them, a magnetic
screw positioned in said air gap, means includ
ing a threaded pressure block and a spring for 30
causing it to bias the screw away from one face
of the air gap for causing the screw to be moved
longitudinally against a bias, a spring for mov
ing the armature to open position upon deener
gization or” the magnetic circuit, and means 210- -
tuated by said movement of the armature for dis
engaging said screw from said pressure block,
whereby said screw is then free to move in re
sponse to its bias.
10. In a time-delay relay, a magnetic circuit
comprising a magnetizable structure and an ar
mature pivotally connected together, means for
energizing said magnetic circuit with alternat
ing flux, said magnetic circuit having a gap
adjacent the pivot point of the armature, a mag
netic screw in said gap in contact with one face
thereof, a spring-pressed bearing block biasing
said screw away from the other face of said gap,
a stop for limiting the movement of said bear
ing block, a thread on said block cooperating 50
with the threads of said screw when in engage
ment, an adjustable stop on said screw limit
ing its movement in the direction opposite to
the action of said threads, a thrust member
comprising an abutment on said screw, a con
tact carrying member mounted on said arma
ture, a spring yieldably constraining said con
tact carrying member to move with said arma—
ture, a spring biasing said armature in opposition
to the flux, a cam carried by said armature 60
and acting upon said screw to move it out of
engagement with said bearing member upon
movement or" said armature in response to said
bias, and a detent preventing said contact car
rying member from completely following the 65
movement of the armature, said thrust member
acting upon said detent when the screw has trav
eled a distance determined by said stop on the
screw to move the detent to inoperative position.
GEORGE C. ARMSTRONG.
70
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