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Патент USA US2108428

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Feb. 15, 193..
A. BROWN ET AL
2,10,42
ELECTRIC SWITCHJPARTICULARLY FOR USE IN CONTROL OF RAILWAY SIGNALS
Filed Sept. 16, 1956'
m’
7
12
14
HE)
INVENTORS
A. BROWN , R.H.DUNN
AND
D.G.MOKIE
‘ATTORNEY I
Patented vFeb. 15, 1938
2,18,42
UNITED STATES
PATENT OFFiE
2,108,428
ELECTRIC swrron, PARTICULARLY FOR
USE IN CONTROL OF RAILWAY SEGNALS
Andrew Brown, Roland Harris Dunn, and David
Gordon McKie, London, England, assignors to
International Standard Electric Corporation,
New York, N. Y.
Application vSeptember 16, 1936, Serial No. 101,028
' In Great Britain
9 Claims.
(Cl. 200—153)
This invention relates to electric switches
having parts moved by different means and
adapted to close (or open) an electric circuit
when the parts so moved are in given relative
5 positions.
One feature of this invention consists in an
electric switch of the kind referred to compris
ing a part-movable by one means, a second part
movable by a second means, a third part mov
able by both the ?rst and second means, and
means for closing (or opening) an electric circuit
when contacts on all three parts are in a given
relative position.
September 27, 1935
‘
Another feature of the invention consists in an
15 electric switch of the kind referred to compris
ing a ?rst disc carrying contacts and rotatable
directly by one means, a brush rotatable directly
by a second means over said contacts and also
over contacts on a second disc for completing
tion again, and it allows incounting and out—
counting to take place simultaneously.
One embodiment of the invention will be de
scribed with reference to the accompanying
drawing but it is to be understood‘ that the in 5
vention is not restricted to that embodiment, nor
to a switch intended for this particular appli—
cation.
Figure 1 of the drawing shows a side view or
10
the'switch, half in cross section, whilst
Figures 2 to 6 illustrate details thereof.
Referring to the drawing a ratchet wheel 2
and an insulating ?bre disc 3 are ?xed to a cen- '
tral shaft I, journalled in a suitable frame (not
shown).
are rotatably mounted on a spider 6 and engage
with the sun wheel 4 and with an outer sun
20 an electric circuit, andmeans for rotating said . wheel 7.
second disc by said ?rst and. second means in
step down ratios that are complementary to one
another.
7
Yet another feature of the invention consists
in an electric switch of the kind referred to for
controlling an electric circuit according to the
relation between two different series of impulses
comprising ratchet wheels adapted to be stepped
by the respectiveseries of impulses, inner and
outer sun wheels attached to said ratchet wheels,
a disc carrying contacts in said circuit attached
to one of said sun wheels, a disc carrying other
contacts in said circuit attached to a planet
wheel meshing with each of said sun wheels, and
a disc carrying‘ a brush adapted to bridge said
contacts to complete said circuit and attached to
the other of said sun wheels.
'
One application of the invention is to switches
used for counting the wheels of a train into and
4:0 out of a given section of track.
The spider 6 is mounted on a sleeve 8
freely rotatable on the shaft I. The sleeve 8
carries a second insulating ?bre disc 9. The
outer sun wheel ‘I is ?xed to an outer sleeve Ill
freely rotatable on sleeve 3 and carrying a
ratchet wheel II and an insulating ?bre disc I2,
which latter carries‘ a double brush l3 (Figs. 1
and 2) wiping over the peripheries of the discs '
3 and 9. One terminal of the circuit being con
trolled is connected to a brush. (not shown) wip
ing on a ‘metal annulus l4 ?xed to the insulat 30
ing ?bre disc l2 on the opposite side from that
to which the brush I3 is ?xed. The annulus i4
is cut away as shown in Fig. 3 in order to be clear
of the rivets fastening brush l3 to disc H. An
other brush i9 (Fig. 2) is ?xed on the side of the
disc l2 opposite to that on which the annulus
M is ?xed, but connected to the annulus by studs
passing through the ?bre. ‘Brush l9 wipes on a
metal plate 55 (Fig. 4) ?xed to the insulated
The signals are '?bre disc 9.
automatically set to danger when the ?rst wheel
enters the section,- and by means of treadles
operated by‘the passage of the wheels, or by other
means, an impulse is sent to control equipment
4 01
for the signals for each wheel entering the track
section and another impulse for each wheel leav
ing the section. When the same number of out
counting as in-counting impulses has been re
ceived a circuit is completed for a relay which
restores the signals to clear or allows them to
be manually restored. For such application the
switch of the present invention possesses many
advantages. Itallows of a large total count be
55
The inner sun wheel 4 of a sun and 15
planet gear is secured to the ratchet wheel 2.
Planet wheels, of which one only (5) is shown,
fore the incounting portion reaches initial posi
The circuit terminal is thus effec 40
tively connected to the plate Iii. The edge of
this plate is within; that of the ?bre'disc except
for a projection 20 where it is level therewith.
The projection 20 extends over sufficient distance
for the brush iii to contact with it at the initial
position and for the distance through which discv
9 is moved by two steps of either of the ratchet
wheels 2 or H to each side of the home position.
On one side of the disc 3 which is also of insu
lated ?bre is mounted ametal plate 16 Fig. 6
which has two projections 2| and 22 level with
the ?bre each two steps removed from home po
sition, and is connected by metal studs passing
through the ?bre to a metal annulus l ‘I (see Fig.
.5) on the other side of the disc 3. A metal an 55
2
2,108,428
nulus l8 surrounding, but separated from the
steps apart. It is also clear that the projections
annulus I‘! has a projection 23 level with the
?bre disc 3 at the home position. Circuit ter
minals are connected to brushes 24 and 25 wip
ing over the annuli ll and i8 respectively.
and depressions could be interchanged so as to
make an electric circuit in all positions but the
desired one or few. It is also clear that, as re
In operation, the switch is arranged originally
in the home position in which the brush l3 rests
on the projections 23 and 20 and so completes
a circuit between the plate [5 and annulus H3.
gards certain features of the invention, the two
sun wheels could be driven continuously instead
of step by step.
What is claimed is:
The relay responding to incounting impulses op
crates a pawl stepping one of the ratchet wheels
1. An electric switch of the kind referred to
comprising a contact part movable by one means,
a second contact part movable by a second means,
and the relay responding to out~countlng im
a third contact part movable by both the ?rst
pulses operates a pawl stepping the other ratchet
and second means and means for closing (or
opening) an electric circuit when contacts on all
three parts are in a predetermined relative po
wheel in well known manner.
It is immaterial
15 which ratchet wheel is rotated by in-counting
impulses but for simplicity of description it will
be assumed that this is the ratchet wheel 2. On
the ?rst in-counting impulse ratchet wheel 2 is
rotated through the distance of one tooth.
Disc
3 is rotated directly, an equivalent amount, and
disc 9 is rotated through the sun wheel it and
planet wheel 5 by a lesser distance. The ?rst
sition.
2. An electric switch as claimed in claim 1 in
which the three movable parts are rotatable discs.
3. An electric switch as claimed in claim 1 in
which the said first and second means cause 20
impulse is sufficient to break the circuit com
movements of the said third part in a ratio dif
ferent from those in which they respectively
cause the movements of the ?rst and second
pleted in the home position between annulus l8
parts.
25 and plate l5. Further in-counting impulses con
tinue to rotate the discs 3 and 9 and on the com
pletion of two steps a circuit is completed be
tween the plate l5 and plate ll’. After another
step this circuit is broken, and both circuits con
tinue to be broken during further incounting im
pulses. The number of revolutions of disc 3 be
fore both discs 3 and 9 are back in initial rela
tive positions depends on the relative diameters
and numbers of teeth on the sun wheel 4 and
planet wheel 5. In order to meet railway re
quirements that a total number of 599 wheels
can be counted, it has been found satisfactory
to provide 60 teeth on the sun wheel 4 and 12
teeth on the planet wheel 5, the diameters being
in the same ratio. Then twelve complete revo
lutions of the ratchet wheel 2 are necessary be
fore the discs 3 and 9 return to the same rela
tive positions. There are 50 teeth on ratchet
wheel 2 and therefore 600 steps are made before
this occurs.
There are 84 teeth on the sun wheel
‘I and the diameter of this wheel is in correspond
ing ratio. When ratchet wheel I l, which is pro
vided with the same number of teeth as ratchet
wheel 2, is stepped during the out-counting (in
the same direction as ratchet wheel 2) the
brushes l3 and sun wheel ‘I are rotated corre
spondingly, whilst the disc 9 is rotated through
the sun and planet gearing in a ratio comple
mentary to that by which it was rotated by
The circuits are again closed
when the discs 3 and 9 and brushes I3 are again
in the same relative positions and this occurs
'- ratchet wheel 2.
4. An electric switch of the kind referred to
comprising a ?rst disc carrying contacts and ro
tatable directly by one means, a brush rotatable
directly by a second means over said contacts
and also over contacts on a second disc for com
pleting an electric circuit and means for rotating
said second disc by said ?rst and second means
in step down ratios that are complementary to
one another.
5. An electric switch as claimed in claim 4 in
which said ?rst and second discs are attached
to inner and outer sun wheels of a sun and planet
gearing driven by said ?rst and second means
and said third disc is driven by a planet wheel
meshing with said inner and outer sun wheels.
6. An electric switch as claimed in claim 4 in 40
which each of said sun wheels is driven in a step
by step manner by means of a pawl acting on a
ratchet wheel attached thereto.
7. An electric switch of the kind referred to
for controlling an electric circuit according to the 45
relation between two different series of impulses
comprising ratchet wheels adapted to be stepped
by the respective series of impulses, inner and
outer sun wheels attached to said ratchet wheels,
a disc carrying contacts in said circuit attached
to one of said sun wheels, a disc carrying other
contacts in said circuit attached to a planet wheel
meshing with each of said sun wheels, and a disc
carrying 'a brush adapted to bridge said con
tacts to complete said circuit and attached to 55
When the number of out-counting impulses is the
the other of said sun wheels.
8. An electric switch as claimed in claim '7 in
which the said sun wheels are rotated in the same
same as those by which ratchet 2 was previously
direction.
60 stepped.
It is clear, however, that in-counting
and out-counting may take place simultaneously.
It is to be understood that the invention is not
limited to the precise details shown and de
scribed. For example, other gear ratios might
be used for counting up to the same total num
ber or up to other different totals.
For use in other applications than that speci?
cally referred to the projections on which brush
l3 makes contact could be arranged to close a
circuit when the discs are a given number of
9. An electric switch as claimed in claim '7 in 60
which the inner one of said sun Wheels and the
disc attached thereto is mounted on a shaft, the
said planet wheel is mounted on a spider carried
on a ?rst sleeve rotatable on said shaft and the
outer of said sun wheels and the disc; carrying
the brush are mounted on a second sleeve rotat
able on said ?rst sleeve.
ANDREW BROWN.
ROLAND HARRIS DUNN.
DAVID GORDON MCKIE.
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