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Патент USA US2117677

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May 17, 1%38.
s‘ R. PFLASTERER
2,117,677
RAILWAY SWITCH CONTROL APPARATUS
Filed April 8, 1957
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Patented May 17, 1938
2,117,677
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UNITED STATES
PATENT A OFFICE
2,117,677
RAILWAY swrron CONTROL APPARATUS
George R. P?asterer, Swissvale, Pa., assignor to
The Union Switch & Signal Company, Swiss
vale, Pa., a corporation of Pennsylvania
‘Application April 8, 1937, Serial No. 135,678
12 Claims. (Cl. 246-219‘)
My invention relates to railway switch control B of any suitable source of energy through con
apparatus.
‘
tact l0—ll of lever A, relay WR, and contact
>
I shall describe one form of railway switch con
l2—l 3 of lever A to terminal C of the same source
trol apparatus embodying my invention, and shall
then point out the novel features thereof in
of energy. Normal magnet N is energized by a
circuit which passes from terminal B through
normal polar contact |4-|5 of relay WR, back
point of contact [6 of timing relay FR, and nor
mal magnet N to terminal 0. Polarized switch
indication relay KR ,is energized in the normal
claims.
‘
.
The accompanying drawing is a diagrammatic
view illustrating one‘form of railway switch con
101
trol apparatus embodying my invention.
Referring to the drawing, the reference char
acter M designates a motor operatively con
nected, by suitable means not shown in the draw
ing, with a railway track switch W. As here
shown, the motor M is of the well-known electro
15, pneumatic type controlled by a lock magnet L, a
normal magnet N, and a reverse magnet R.
When the normal magnet N is energized, the
direction by a circuit which passes over a path
from terminal B through switch contact 2--5, re
lay KR, normal polar contact I7—-l8 of switch
control relay WR, and switch contact 3—-6 to
terminal C.
,
I shall now assume that the operator desires to 15
cause switch W to move from its normal posi
tion to its reverse position. He may do this by
motor M will becaused to drive the switch W to
its normal position, as shown in ‘the drawing, pro
reversing lever A which will establish a circuit to
energize switch control relay WR in the reverse
20 vided lock magnet L is also energized, and when
the reverse magnet R is energized, the motor M
will be caused to drive switchW to its reverse
position provided lock magnet L is also energized.v
The switch W controls a pair of pole changing
2 contacts 2 and 3 and also a contact 4 by suitable
minal B through contact [9-42 of lever 'A, relay
WR, and contact II—20 of lever A to terminal 0.
As a result, polar contacts l4, and H of switch
control relay WR will move to the right to energize
reverse magnet R and to deenergize switch in
and well-known means in accordance with the
switch position. That is, when switch W is in
its normal position, contacts 2, 3, and 4 are in
engagement with contacts 5, 6, and 7, respectively,
30 and when switch W is in its reverse position, con
tacts 2, 3, and 4 are in engagement with contacts
8, 5, and 9, respectively.
The reference character WR designates a
polarized switch control relay which is reversibly
3
governed by a lever A. The reference character
KR designates a polarized switch indication relay
which is controlled by switch pole changing con
tacts 2 and 3 and by switch control relay W'R.
The reference character FR designates a timing
40 device here shown as a relay having a slow pick-up
characteristic.
The
reference ‘ character
RR
designates another timing device here shown as
a relay having a slow pick-up slow release char
acteristic. The pick-up time of timing relay‘ FR
45 and the pick—up and release times of timing relay
RR are of substantially equal lengths and, as
will be explained more in detail hereinafter, the
operating times of these relays are of such values
that the switch W will have ample time to move
50 from one extreme position to the other before
the timing relays complete their operation.
direction.
This circuit may be traced from ter- ,
dication relay KR. The circuit for reverse mag
net R may be traced from terminal B through
reverse polar contact Ill-4| of relay WR, back
point of contact 22 of timing relay FR, and reverse
magnet R to terminal C. The releasing of switch
indication relay KR closes its back neutral con
tact 23 to energize lock magnet L. When lock
magnet L and reverse magnet R are energized,
motor M will be caused to move switch W to its
reverse position. The closing of back neutral
contact 23 of switch indication relay KR also en
ergizes timing relay FR over an easily traced cir
cuit which includes front neutral contact 24 of
switch control relay WR. If switch W is not ob
structed so that its movement to the reverse posi—
tion is completed in the usual operating time
of the switch, indication relay KR will become en
ergized to disconnect energy from timing relay
FR before relay FR becomes picked up. The cir
cuit for energizing relay KR when switch W is in 45
its reverse position and switch control relay WR is
energized in the reverse direction may be traced
over a path which passes from terminal B through
switch contact 2,—-8, reverse polar contact ll—25
of switch control relay WR, relay KR, and switch
contact 3-5 to terminal C.
, With all apparatus in its normal condition, as
If, however, the switch W becomes obstructed
shown in the drawing, polarized switch control
relay WR is energized in the normal direction by
by, for example, a piece of coal or ice so that it
55 a circuit which passes over a path from terminal
fails-to attain its reverse position before timing
relay FR becomes picked up, then motor M will 55
2
2,117,677
be removed from control by switch control relay
position and an intermediate position at which
WR and placed under control by auxiliary tim
it became obstructed until such time as the
ing relay RR. The opening of back point of con
tact 22 of timing relay FR will deenergize reverse
magnet R and the closing of front point of con
tact l6 of relay FR will energize normal mag
net N so that switch W will be restored to its
normal position. The circuit for energizing nor
mal magnet N may be. traced from terminal B
through reverse polar contact Ill-2| of switch
object which is obstructing the switch points is
crushed to permit the switch W to attain its re
verse position.
It will be noted that the control circuit for the
timing relay FR includes front neutral contact
control relay WR, back point of contact 26 of
timing relay RR, front point of contact I 6 of tim
ing relay FR, and normal magnet N to terminal C.
When switch W is restored to its normal position,
15 a circuit will be established for energizing auxili
ary timing relay RR. This circuit may be traced
over a path from terminal B through switch
contact 4-1, front point of contact 2T of timing
relay FR, and relay RR to terminal C. When,
20 timing relay RR attains its picked up condition,
a circuit will be established to energize reverse
magnet R to cause motor M to drive switch W
towardsits reverse position. This circuit may be
traced from terminal B through reverse polar
24 of switch control relay WR.
If lever L is re
stored. to its normal position while timing relay
FR is in its picked up condition to place the
motor M under control by auxiliary timing relay
RR, it will be apparent that the opening of front
contact 24 due to the reversal of current in switch
control relay WR will release timing relay FR to
place motor M again under control by switch 15
control. relay WR.
While I have described the operation of the
apparatus embodying my invention during a
movement of the switch W from its normal posi
tion to its reverse position, it will be readily ap 20
parent that the apparatus‘ wi-lloperate-in a similar
manner if the switch becomes obstructed‘ while
moving from its reverse position to its normal
position.
contact l4:—2l> of switch control relay WR,‘front
point of contact 26 of relay RR‘, front point of
contact 22- of relay FR, and reverse magnet R
to terminal C.
When the contact 26 of relay RR is picked up,
the circuit through its back point of contact to
the normal magnet N is interrupted so that the
Oneadvantage of apparatus embodying my in
vention is that due to repeated and automatic
back and forth movement of the-switch, when the
switch is prevented from reaching one‘ extreme
position or the other by some obstruction, the
obstruction may be- broken‘ down- after a few’ op 301'
motor M is free to move the switch W to. its re
verse position.
complete’ its movement to-the desired: position.
If desired, a suitable signal may’ be provided
When the relay RR picks up and establishes
; , the circuit to the reverse» magnet R, the motor M
drives the switch W away from the normal posi
tion towardsvthe reverse position.
Aslsoon as the switch W is moved away from
the normal position the contact 4- is moved. out
40 of engagement with the contact 1, thereby inter
rupting the circuit to the winding of the reverse
relay RR. However, because of the slow release
characteristic of the relay RR, it will not release
instantaneously when the circuit to its winding
is interrupted, but will maintain the circuit to
the reverse magnet R for a time interval long
enough to complete movement of- the switchv to the
reverse position if the switch is functioning
properly. If. the object which is obstructing the.
50 switch. becomes. crushed so that the switch W
completes its movement to the reverse position,
switch indication relay KR, will. become ener
gized over its. previously traced reverse control
circuit so that timing relay FR will become de
energized. to restore the control of motor M to
switch. control relay WR. If, on the other hand,
the switch W fails to attain its reverse position
on this movement, timing relay RR‘ will become re
leased since it isdeenergized because switch con
GO tact 4 will be in engagement with neither contact
1 nor contact 9. When timing relay RR attains
its release condition, normal magnet N will again
become energized over its p'reviously traced cir
cuit including back point of contact 26 of timing
relay RR and front point of contact 16 of timing
relay FR so. that. motor M will be caused to, re
store switch W to its normal position. When
switch W attains its normal position, timing re
lay RR will again become energized over its pre
' I vi'ously traced circuit to go throughanother cycle
of operation as just described.
In other words,
as long as switch W fails to attain its reverse
position, the auxiliary timing relay RR will be
come alternately picked up and released to drive
.. the switch back and. forth betweenv its normal
erations of the- switch so‘ that the switch can
to- indicate when the- switch has failed to com
plete its movement. For example, a light or a
bell, or‘ both, may be controlled by relay FR in
such a manner as to give’ a warning when relay
FR'becomes picked up. As shown in thedraw
ing, when relay FR becomes picked‘ uplamp 30' will
be energized over an easily traced circuit which 40;
includes front contact 2-9 of relay FR.
Although I have herein shown and described
only one form: of apparatus embodying my in
vention, it is understood that various changes
and; modi?cations may be made therein within 455.:
the scope of the appended claims without depart
ing from the spirit and scope of my invention.
Having thus described my invention, what I
claim is:
1. In combination, a railway track switch’
capable of assuming a ?rst or a second position,
a motor for operating said switch, manually con
trolled means for causing said motor to drive
said switch from said. ?rst position to said second
position, and meansfor causing said motor to re 55.3
store said switch to said ?rst position. if the
switch fails to attain its. second position within
a, predetermined time interval.
2. In combination, a railway track switch
capable of assuming a. ?rst or a second position, a
motor for operating. said‘ switch, manually con
trolled means for causing said motor to drive said
switch from said ?rst positionto said second po
sition, timing means responsive to. the length
of time required by said switch to attain its sec
ond position, and means controlled by said timing
means for at times causing. said motor to. restore
said switch to said ?rst position.
3; In’combination, a railway'track switch ca
pable of assuming a ?rst or a second position, a TLUF
motor for operating said switch, manually con
trolled means for causing said motor to drive
said switch from said ?rst position to said second
position, timing means which becomes operated
if said’ switch» failsrto attain its‘ second position
2,117,677
within a predetermined time interval, and means
for causing said motor to restore said switch to
said ?rst position when said timing means is
operated.
4. In combination, a railway track switch ca
pable of assuming a ?rst or a second position,
a motor for operating said switch, manually con~
trolled means for causing said motor to drive
said switch from said ?rst position to said sec~
end position, means for causing said motor to
restore said switch to its ?rst position if the
switch fails to attain its second position within
a predetermined time interval, and means effec
tive thereafter to cause said motor to repeatedly
15 drive said switch to an intermediate position and
then back to said ?rst position until the switch
does move from said ?rst position to said second
position within said given time interval.
5. In combination, a railway track switch ca
20 pable of assuming a ?rst or a second position, a
motor for operating said switch, manually con
trolled means operable between a ?rst position
and a second position to cause said motor to
drive said switch to its ?rst and second positions
25 respectively, means effective when said manually
controlled means and said switch are out of
correspondence for a predetermined length of
time to cause said motor to alternately drive said
switch towards its two positions until such time
30 as said switch and said manually controlled
means do occupy corresponding positions.
6. In combination, a railway track switch ca
pable of assuming a ?rst or a second position,
a motor for operating said switch,.manually con
35 trolled means operable between a ?rst position
and a second position to cause said motor to
drive said switch to its ?rst and second positions
respectively, an indication relay which becomes
deenergized only if said manually controlled
means and said switch are out of correspondence,
40 and means effective when said indicationv relay
remains deenergized in excess of a predetermined
time interval to cause said motor to alternately
drive said switch towards its ?rst and second
positions until such time as said indication relay
again becomes energized.
'7. In combination, a railway track switch hav
ing a normal position and a reverse position, a
motor operatively connected to said switch,
manually controlled means for causing said motor
to drive said switch from said normal position to
said reverse position, a slow pick-up relay, means
for energizing said relay while said switch is
moving from said normal position to said reverse
position, and means effective if said relay does
55 become picked up to cause said motor to restore
said switch to said normal position.
8. In combination, a railway track switch hav
ing a normal position and a reverse position, a
motor operatively connected to said switch, man
ually controlled means for causing said motor to
drive said switch from said normal position to
said reverse position, an indication relay which
becomes released while said switch is moving from
said normal position to said reverse position, a
65 slow pick-up relay, a circuit for said slow pick
up relay including a back contact of said indica
tion relay, and means effective to cause said motor
to restore said switch to said normal position if
70
said slow pick-up relay does become picked up.
9. In combination, a railway track switch hav
3
ing a normal position and a reverse position, a
motor operatively connected to said switch, a
switch control relay, means for energizing said
switch control relay to cause said motor to drive
said switch from said normal to said reverse posi
tion, a slow pick-up relay, means including a
front contact of said control relay for energizing
said slow pick-up relay while said switch is mov
ing from said normal position to said reverse
position, and means effective if said slow pick-up
relay does become picked up to remove said motor
from control by said control relay and to cause
said motor to restore said switch to said normal
position.
10,. In combination, a railway track switchca 15'
pable of assuming a ?rst position or a second
position, a motor for operating said switch, manu
ally controlled means for causing said motor to
drive said switch between said two positions, a
timing relay which becomes picked up if said
switch fails to move from one position to the
other within a predetermined time interval, an
auxiliary slow pick-up slow release relay, a con
tact which is closed only when said switch is
either in its ?rst position or second position, a 25
circuit for said auxiliary relay including said con
tact and a front contact of said timing relay,
and means eifective when said timing relay is
picked up to cause said motor to drive said switch
from one position to the other according as said
auxiliary relay is picked up or released.
11. In combination, a railway track switch ca
pable of assuming a ?rst position or a second
position, a motor for operating said switch, a
?rst magnet e?ective when energized to cause
said motor to drive said switch to said one posi
tion, a second magnet effective when energized
to cause said motor ‘to drive said switch to said
second position, a timing relay which becomes
picked up if said switch fails to move from
one position to the other within a predetermined
time interval, a contact which is closed only if
said switch occupies its ?rst or second position,
an auxiliary relay having a slow pick-up slow
release characteristic, means including said con
tact and a front contact of said timing relay for
governing said auxiliary relay, a ?rst circuit for
said ?rst magnet including a back contact of said
timing relay, a ?rst circuit for said second magnet
including a back contact of said timing relay, a
second circuit for said ?rst magnet including a
front contact of said timing relay and a back
contact of said auxiliary relay, a second circuit
for, said second magnet including a front con
tact of said timing relay and a back contact
55
of said auxiliary relay, a third circuit for said
?rst magnet including a front contact of said
timing relay and a front contact of said auxiliary
relay, and a third circuit for said second magnet
including a front contact of said timing relay and 60
a front contact of said auxiliary relay.
12. In combination, a railway track switch
having two positions, means for moving said
switch from either position to the other position,
time controlled means which becomes energized 65
upon the initiation of such a movement, and
means governed by said time controlled means
for indicating when the switch fails to complete
its movement within a predetermined time in
terval.
GEORGE R. PFLASTERER.
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