close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2128205

код для вставки
Aug. 23, 1938.
o, s. FIELD
2,128,205
SNUBBING DEVICE FOR THREE-POSITION RELAYS
Filed Feb. 1, 1935
F|G.1.
»
V
//7
o
o»
37
(y
s5
s4
*
s5
24
€
7,25
f
0*“26
“56
,27
6
2a
_
29 1-‘
1/1’ "
19
,J
so
\
4
LN
20
17
1a
1a
-
5
15'
7T kg
’
14
'
/
4/
9
FIG. 2.
a7v
a?
?ZCTLé}
?'NsvEg?zaa
BY
MM
/%4, ATTORNEY
2,128,205
Patented Aug. 23, 1938
UNITED STATES PATENT OFFICE
2,128,205
SNUBBING DEVICE FOR THREE-POSITION
RELAYS
Oscar S. Field, Rochester, N. Y., assignor to Gen
eral Railway Signal Company, Rochester,
N. Y.
Application February 1, 1935, Serial No. 4,590
10 Claims.
This invention relates to relays, and more par
ticularly to a dampening device for relays of the
three-position type.
In certain types of relays, the movable contact
operating ‘element, or armature is operated to
one extreme position in response to one charac
ter of energization of the relay and to another
extreme position in response to a diiierent char
acter of energization, but when the relay is de
10 energized, a biasing means returns the armature
from either of these extreme positions to a center
position. The contacts closed when the armature
assumes one extreme position are usually opened
when the armature reaches its center position
' and different contacts are closed by the other ex
treme position, but upon de-energization of the
relay, it is found that the center biasing means
imparts such velocity to the armature during its
operation from an extreme to a center position
that the momentum carries the armature su?i
ciently beyond center to momentarily close the
contacts associated with the other extreme op
erated position.
Such momentary closing of
‘these contacts is of course unwarranted by the
condition of the relay, and obviously may cause
improper control of circuits or apparatus af
fected by the position of the relay contacts.
(Cl. 200-87) ,
ber when the armature is at or near its center
biased position. However, as the action of the
dampening means to restrict ‘movement of the
armature beyond the center position is not de
sirable when the armature is at rest in the center
position, the dampening device is arranged to be
ineffective to restrict the inherently slow move
ments starting from a center position, but to
become e?ective to prevent beyond center move
ments only under dynamic conditions. Speci?
cally, the armature-carried member does not
operably coact with the stationary member in a
static condition of the armature, but the inertia
of a part of the armature-called member when
the armature is accelerated toward its center po 15
sition effects movement of the armature-carried
member into a position wherein it does coact
with the stationary member to absorb the mo
mentum obtaining in the moving armature upon
20
reaching a center position.
The novel features considered characteristic
of the present invention are set forth with par
ticularity in the appended claims. The invention
itself however, both as to its organization and
its method of operation, together with additional
objects and advantages thereof, will best be un
derstood from the following description of a
speci?c embodiment when read in connection
with the accompanying drawing, in which:—
Fig. 1 shows diagrammatically an elevational
View of the armature'portionof a three-position
vane type relay having the present invention ap
overrunning of the armature in traveling from ' plied thereto.
In view of the above and other considerations,
it is an object of the present invention to pro
vide a dampening means for relay .armature or
other devices operable to three positions, so ar
ranged as to prevent an objectional degree of
either extreme position to the center biased po
35 sition.
Another object of the present invention is to
provide such a dampening means which does not
in any manner restrict the movement of the
armature from a static center position to either
40
extreme position.
Other objects of the present invention include
provision of apparatus for obtaining the above
objects which is simple and compact in order to
obtain the advantages of greater reliability and
e?iciency in operation as well as economy in man
ufacture.
The foregoing objects and others which will be
obvious as the description of the present inven
Fig. 2 is a side elevational view of a portion
of Fig. 1.
35
Fig. 3 is a view similar to a portion of Fig.1 1
but illustrating an instantaneous unbalanced
condition obtaining during operation of the pres
ent device.
The present invention has been shown in the
drawing as applied to the movable parts or the
armature assembly of a three-position polyphase
relay such as used for railway signalling purposes,
but it is understood that the present invention
is equally applicable to other relays or members
of various other devices which are actuated in
either of two directions from a biased center
position.
tion progresses are in general accomplished as
In Fig. 1, a horizontal shaft 4 is rotatably car
follows2—
The tendency of a three-position device such
ried by suitable anti-friction bearings not shown,
as an armature to overrun its center position is
herein prevented by a dampening means com
which shaft 4 carries an actuating vane 5 ?xed
thereto and a T-shaped .arm 6 also attached
thereto but spaced longitudinally on the shaft 4
prising a member carried by the armature in a
manner to coact at ‘times with a stationary mem
according to the arrangement of the other relay
parts not shown herein. The means for actu 65
2
2,128,205
ating the vane 5 is immaterial to the present in
vention, it merely being necessary to understand
that the vane 5 is operated either in a clockwise
or a counter-clockwise direction from its center
position.
However this vane may be operated in
the same manner as a similar vane of a relay
shown in detail in Patent No. 1,882,846 granted
October 18, 1932 to W. K. Howe.
The arrangement illustrated for biasing the
shaft 4 from either extreme operated position to
its center position comprises two weights 1 and
8 attached to outer ends of respective arms 9
and III, which arms operate about a common
pivot pin H at their inner ends, the pivot pin
15 H being held by an upwardly extending boss of
a stationary member l2 which may be part of
the frame structure of the relay. The outer por
tions of the arms 9 and H] are connected by bear
ings l5 and IE to respective connecting arms l3
20 and I4, the upper ends of the arms l3 and I4
being provided with slots I‘! and I8 receiving pins
I9 and 20 respectively which pins are carried
at the ends of oppositely extending horizontal
25
arms of the T~shaped member 6.
It will now be obvious that when the shaft 4
is rotated in a clockwise direction, the weight ‘I
is raised through the medium of the connecting
arm l3, while the weight 8 is not moved, the pin
20 merely moving downwardly in the slot I8, so
30 that the raised position of weight ‘I furnishes the
biasing force necessary for returning the shaft
be obvious, the upper horizontal surface should
be as close as practical to the pivot support 34.
The shaft 4 may obviously be rotated in either
direction from its center position shown in Fig.
1 without interference in any manner by the
present dampening arrangement as long as the
start of such movements is at a reasonable rate
of acceleration, the only means holding it in the
center position being the weights 1 and 8.
Now considering that the relay is energized in J
a manner to operate the shaft 4 in a counter
clockwise direction to its extreme left hand posi—
tion, the pendulum member 35 being free to ro
'tate about its pivot 34, now moves relative to the
member 6 to still hang vertically from its pivot
34. However upon deenergization of the relay,
the upper end of member 6 moves in a clock
wise direction toward its center position due to
the action of the biasing weight 8, and the in
ertia of the pendulum weight 36 due to the ac
celeration obtaining during this movement of the
member 6 causes the lower end of the pendulum
member 35 to lag the movement of its pivot end,
thereby operating the pendulum member 35 into
an unbalanced position out of its vertical align- 1: Ll
ment,
This displacement of the member 35 from its
vertical alignment will be retained until the mem
ber 6 reaches its center position and a condition
such as shown in Fig. 3 will momentarily exist.
In Fig. 3 it is obvious that the lower edge of the
4 back to its illustrated center position. In a
very similar manner, the weight 8 is lifted by
a counter-clockwise rotation of shaft 4, while
the pin l9 moves downwardly in slot [1, to there
by bias the armature towards its center position
per edge of the pendulum member 35 at a point
to the left of the pivot 34, and the momentum or
from its counter-clockwise rotary position.
A movable contact ?nger 24 is diagrammatical
absorbed by the impact resulting from the en~
gagement of these two members, thereby stop
1y shown as assuming a center position in ac
cordance with the center position of the vane
5, the contact 24 being carried by an insulating
block 25 rotatably mounted in a suitable manner
by a center pivot pin 26. A downwardly extend
ing arm 21 is attached to the insulating block
25 and the lower end of arm 21 is connected by
bearing 29 to one end of a connecting arm 28,
the other end of arm 28 being connected by bear
ing 30 to the upwardly extending portion of the
T-shaped arm 6. With this arrangement, it will
50 be obvious that a clockwise rotation of shaft 4
will rotate the insulating block 25 in a counter
clockwise direction thereby moving the movable
contact ?nger 24 downwardly, while a counter
clockwise rotation of shaft 4 will result in an
upward movement of contact 24 in a similar man
ner.
The present dampening device is arranged
about the extreme upper end of the upwardly
extending arm of the T-shaped member 6, and
60 comprises a pivot pin. 34 suitably attached to the
extreme upper end of the member 6, which pin
34 carries a pendulum member 35 arranged to
rotate freely thereabcut. The lower end of the
pendulum member 35 carries a weight 36, while
the upper end is enlarged to present a flat hori
zontal surface, which surface barely clears the
lower edge of a stationary member 31 when the
member 6 is at rest in the position illustrated in
Fig. 1. The member 31 has a wedge-shaped lower
end and is suitably fastened to a stationary
upright member 38 as shown in Fig. 2, which
member 38 may be the frame of the relay. The
pendulum member 35 should be mounted on the
member 5 at a point considerably above its cen
ter of gravity, and for reasons which will later
stationary member 31 will be engaged by the up
kinetic energy obtaining in the moving parts of
the relay upon reaching a center position will be
ping the member 6 in its center position.
The member 35 of course returns immediately
to a vertical position due to gravity, which re
turn movement is obviously accelerated by its
impact on the stationary member 31 so that a
beyond-vertical movement may result, but it is
contemplated that this will cause an engagement 115
between the stationary member 31 and a point
on the upper edge of the pendulum member 35
located to the right of the pivot 34, thereby inter
fering with rebounding of the member 6.
The action of the present dampening means 4
during a movement of the member 6 from its
clockwise rotated position to a center position
is very similar to the action just described, or
that is, the lower end of the pendulum member
35 will lag the motion of its pivot end, resulting
in a displacement of the member 35 out of ver
tical alignment upon reaching a center position.
This displacement of member 35 from vertical is
in the opposite direction to that illustrated in Fig.
3, but the resulting impact with the stationary
member 31 is effective to stop member 6 in the
same general manner.
The dampening means for a three-position rc
lay armature thus provided is obviously operable
to prevent overrunning of the relay armature (i5
beyond its center position ordinarily due to the
momentum imparted to the moving parts by the
biasing means. In the present dampening
means, the momentum of the moving parts is ob
viously absorbed by the impact of the armature
carried member with the stationary member when
the armature reaches its center position, thereby
stopping the armature abruptly as the reaction
to this impact results in a motion of the arma
ture carried member which acts to prevent a re
2,128,205
active movement of the armature. This pre
vents the bobbing of the armature so objection
able in ordinary resilient centering means. A
very important feature of the present dampening
means is its arrangement whereby it does not
restrict or in any way add to the effort required to
gradually move the armature from a static center
position.
10 form of the present invention is given solely by
the way of example, and is not intended, in any
It is also
to be understood that various modi?cations,
adaptations and alterations may be applied to
15 meet the requirements of practice, without in
any manner departing from the spirit or scope of
the present invention, except as limited by the
appended claims.
Having thus described my invention what I
20 claim is:—
1. In a centering means for a three-position
relay armature or the like, in combination with
a pivoted armature shaft biased to a center posi
tion from operated positions either side of the
25 center position, an upwardly extending arm car
ried by the shaft, a wedge-shaped stationary
member positioned above the center position of
the arm, a pendulum-like member pivotably car
ried at the upper end of the arm, and lugs ex
30 tending horizontally from the pendulum-like
member and operable into positions coacting with
the stationary member by a response of the
pendulum-like member to acceleration of the arm
toward its center position.
2. In a centering means for a three-position
relay armature and the like, in combination with
a pivoted armature shaft biased to a center posi
tion from operated positions either side of the
center position, an upwardly extending arm on
40 the shaft, a pendulum member pivotably mount
ed on the arm, a stationary member above the
pendulum member, and means on the pendulum
member engageable with the stationary member
only when the pendulum member is moved out of
45 vertical alignment.
3. In a dampening means for a three-position
armature, in combination with a rotatable arma
ture biased to a center position from operated
positions either side of the center position, an arm
50 on the armature, a pendulum member rotatably
carried by the arm, and a stationary member
coacting with the pendulum member only when
the pendulum member is not in a state of equi
librium.
55
either direction from a biased center position, the
combination of an arm on the armature, a
pendulum member on the arm, a stationary mem
ber positioned in the path of the pendulum mem
ber only when the pendulum member is operated
out of vertical alignment by acceleration of the
armature arm.
6. In a dampening means, in combination, a
The above rather speci?c description of one
manner whatsoever in a limiting sense.
3
4. In a dampening means for a three-position
armature, in combination with a rotatable arma
ture biased to a center position from operated
positions either side of the center position, an arm
on the armature, a pendulum member rotatably
60 carried by the arm, and a stationary member
stationary member, a pendulum member actuable
relatively to the stationary member at a pivot 10
support located above its center of gravity, the
stationary member coacting with the pendulum
member only when the center of gravity of the
pendulum member is out of vertical alignment
with its pivot support.
15
7. In an inertia dampening means for vane
type relays and the like, in combination, a sta
tionary abutment, a pivoted member freely rock
able on its pivot, means for bodily moving the
pivoted member and its pivot past the abutment, 20
the pivoted member and the abutment being
spaced so that the pivoted member clears the
abutment when moved at a uniform rate of speed,
the pivoted member being non-symmetrical about
its pivot and arranged to contact the abutment
when it is su?iciently accelerated as it is moved
vpast the abutment.
8. In an inertia dampening means for vane
type relays and the like, in combination, a sta
tionary abutment, a pivoted member freely rock 80
able on its pivot and having a substantially flat
faced part above its pivot, means for bodily
moving the pivoted member and its pivot past the
abutment in a direction substantially parallel to
the flat face, the pivoted member and the abut
ment being spaced so that the flat faced part
clears the abutment when moved at a uniform
rate of speed, the pivoted member being non
symmetrical about its pivot and arranged to con
tact the faced part and the abutment when the
pivoted member is sufliciently accelerated as it
is moved past the abutment.
9. In a relay having an armature operable from
a biased position, the combination of an arm on
the armature, a pendulum member on the arm, a 45
stationary member positioned in the path of the
pendulum member only when the pendulum mem
ber is operated out of vertical position by accelera
tion of the armature arm.
10. In dampening means for a relay armature 50
and the like, in combination with a pivoted arma
ture shaft biased to a position from an operated
position, an upwardly extending arm carried by
the shaft, a wedge-shaped stationary member po
sitioned above the biased position of the arm, a 55
pendulum-like member pivotably carried at the
upper end of the arm, and lugs extending hori
zontally from the pendulum-like member and
operable into positions coacting with the sta
positioned to clear the pendulum member only
tionary member by a response of the pendulum 60
like member to acceleration of the arm toward its
when the pendulum member is in a state of stable
biased position.
equilibrium.
5. In a, relay having an armature operable in
OSCAR S. FIELD.
Документ
Категория
Без категории
Просмотров
0
Размер файла
521 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа