EP1345803A1 - Actuator arrangements - Google Patents

Actuator arrangements

Info

Publication number
EP1345803A1
EP1345803A1 EP01271302A EP01271302A EP1345803A1 EP 1345803 A1 EP1345803 A1 EP 1345803A1 EP 01271302 A EP01271302 A EP 01271302A EP 01271302 A EP01271302 A EP 01271302A EP 1345803 A1 EP1345803 A1 EP 1345803A1
Authority
EP
European Patent Office
Prior art keywords
actuator
sliders
arrangement according
actuation
rods
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01271302A
Other languages
German (de)
French (fr)
Other versions
EP1345803B1 (en
Inventor
Anthony Roger Davies
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SPX International Ltd
Original Assignee
General Signal UK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB0031023A external-priority patent/GB0031023D0/en
Priority claimed from GB0102061A external-priority patent/GB0102061D0/en
Application filed by General Signal UK Ltd filed Critical General Signal UK Ltd
Publication of EP1345803A1 publication Critical patent/EP1345803A1/en
Application granted granted Critical
Publication of EP1345803B1 publication Critical patent/EP1345803B1/en
Priority to CY20081100364T priority Critical patent/CY1107378T1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
    • B61L5/06—Electric devices for operating points or scotch-blocks, e.g. using electromotive driving means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
    • B61L5/04—Fluid-pressure devices for operating points or scotch-blocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
    • B61L5/10—Locking mechanisms for points; Means for indicating the setting of points

Definitions

  • This invention relates to actuator arrangements.
  • a main drive actuator bears against the switch rail close to its free end or toe
  • the main drive actuator usually includes some form
  • first and second actuator means arranged to bear against respective movable
  • Figure 4 shows a locking mechanism having two rods 70 and 71 displaced
  • Figure 5 shows a locking mechanism similar to that of Figures 1 and 2 except that
  • the sliders 124 and 130 have been modified each to have a hook portion 224 and 230
  • roller 127 is located between opposed faces 126 and 132 of the sliders 124 and 130. It
  • roller 127 it will cause the roller 127 to locate between the two hook portions 224 and 230 so that
  • the actuator need not be hydraulic but could, for example, be electromechanical or pneumatic.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Lock And Its Accessories (AREA)
  • Pinball Game Machines (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Manipulator (AREA)
  • Mechanical Control Devices (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

An actuator arrangement for moving first and second members (3, 4), the two members (3, 4) being interconnected with one another by a linkage (5) extending between them. The arrangement comprises first and second actuator means (6, 7) arranged to bear against respective movable members (3, 4) such that actuation of the first actuator (6) causes both movable members (3, 4) to move in one direction and actuation of the other actuator (7) causes both movable members (3, 4) to move in the opposite direction. A locking mechanism (20, 21) is coupled with the first and second actuators (6, 7) and is so arranged as to allow free movement in opposite directions caused by actuation of the first and second actuator means respectively but to prevent movement in either direction when not caused by actuation of the respective actuator means.

Description

DESCRIPTION
"ACTUATOR ARRANGEMENTS"
This invention relates to actuator arrangements.
Various kinds of actuator arrangements are used to switch railway points or
switchgear. A main drive actuator bears against the switch rail close to its free end or toe
and acts to push this against the side of the fixed stock rail. Where the switch rail has a
long curved section it may be necessary to have one, two or up to three additional
actuators, or backdrive actuators, spaced along the switch rail to push it and hold it in
position relative to the stock rail. The main drive actuator usually includes some form
of clamp or latch that positively locks the switch rail against the stock rail. This ensures
that the switch rail is held in the correct position even if the force applied by the actuator
itself should fall. Because railway points may be held in a switched period for prolonged
periods, perhaps for several days, there is inevitably some relaxation in the actuator, such
as caused by leakage of hydraulic fluid and, therefore, a gradual loss of force. It is less
easy to lock the switch rails in the desired position at the location of the backdrive
actuators because the switch rails may be spaced from the stock rail. For this reason, the
usual practice is to monitor displacement of the switch rails from the desired position and
to correct for this as necessary by reapplying power from the backdrive actuator. Any
detected deviation of the switch rails from their desired position will cause a momentary
failure indication before repowering of the actuator has corrected for this. This can lead
to the generation of a danger signal on the railway line with consequent interruptions to rail traffic.
It is an object of the present invention to provide alternative actuator
arrangements.
According to one aspect of the present invention there is provided an actuator
arrangement for moving first and second members, the two members being
interconnected with one another by a linkage extending between them, the arrangement
including first and second actuator means arranged to bear against respective movable
members such that actuation of the first actuator causes both movable members to move
in one direction and actuation of the other actuator causes both movable members to
move in the opposite direction, and a locking mechanism coupled with the first and
second actuators, the locking mechanism being arranged to allow free movement in
opposite directions caused by actuation of the first and second actuator means
respectively but to prevent movement in either direction when not caused by actuation
of the respective actuator means.
The actuator arrangement is preferably a hydraulic actuator. The locking
mechanism preferably includes two rods movable along their lengths and having
respective sliders movable along a channel, the sliders being arranged to apply an
outward locking force on walls of the channel when one rod is pushed towards the other.
The sliders may have cooperating inclined faces. The first and second members are
preferably switch rails.
A railway point actuator arrangement according to the present invention will now
be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a plan view of the arrangement;
Figure 2 is a more detailed view of the locking mechanism; and
Figures 3 to 5 show alternative locking mechanisms.
With reference first to Figures 1 and 2, the actuator arrangement is located
between a pair of fixed stock rails 1 and 2 and a pair of movable members in the form of
switch rails 3 and 4 extending between the stock rails. The switch rails 3 and 4 are linked
together by a linkage or stretcher bar 5 extending laterally between the rails.
The actuator arrangement includes two conventional hydraulic actuator cylinders
6 and 7 fixed at their bases 8 and 9 to a sleeper 10, or other fixed structure, and extending
laterally outwardly in line with one another. The cylinders 6 and 7 are driven by hydraulic fluid from a conventional supply indicated generally by the numeral 11. The
pistons 12 and 13 of the cylinders 6 and 7 each support a respective bracket 14 and 1-5 the
outer face of which carries a respective insulating nylon brush 16 and 17. The bushes 16
and 17 bear against the inside faces 18 and 19 of respective switch rails 3 and 4 so that
the switch rails can be pushed outwardly by actuation of the appropriate actuator. The
actuators 6 and 7 only make an abutting contact with the switch rails 3 and 4, enabling
them to be pushed out, and are not attached with the switch rails. The brackets 14 and
15 also support opposite ends of two locking mechanisms 20 and 21 of identical
construction.
Each locking mechanism 20 and 21 includes a first laterally-extending rod 22
connected at one end with left-hand bracket 14 by a pair of nuts 23. The opposite end of the rod 22 extends about halfway across the gap between the two brackets 14 and 15 and
carries a slider or wedge 24 having an outer face 25 extending parallel with the rod 22
and an inner face 26 inclined to the axis at an angle of about 30°. The slider 24 may carry
a roller 27, as shown in Figure 2. The locking mechanisms 20 and 21 also include a
second laterally-extending rod 28 extending inwardly from the opposite bracket 15. This
rod 28 has its outer, right-hand end secured with the bracket 15 by a pair of nuts 29 and
its inner, left-hand end carries a second slider wedge 30 shaped to cooperate with the first
slider 24. The second slider 30 has an outer face 31 extending parallel with the rod 28
and an inner face 32 inclined parallel with the face 26 of the first slider 24. The two rods
22 and 28 extend in a fixed channel 34 in the sleeper 10 having facing sides 35 against
which slide the outer faces 25 and 31 of the two sliders 24 and 30.
When the left-hand switch rail 3 is to be moved over to its adjacent stock rail 1,
a pump 40 in the supply unit 11 is operated to that fluid is supplied to the left-hand
actuator 6, thereby causing its piston 12 to extend, pushing out its bracket 14 and hence
pushing the switch rail 3 against the side of the stock rail 1. As it does this, it also pulls
the rod 22 and its slider 24 in both locking mechanisms 20 and 21 to the left along the
channels 34, along which they are free to slide. The stretcher bar 5 pulls the right-hand
switch rail 4 to the left. The inside surface 19 of the right-hand switch rail 4 bears against
the bush 17 on the bracket 15 and pushes in the piston 13 so that fluid in the cylinder 7
flows back to the supply unit 11. The two switch rails 3 and 4, therefore, both move over
to the left as a pair. The pump 40 is then turned off and a pilot-operated check valve 41
locks the left-hand actuator 6 in this position by preventing flow of fluid out of the actuator until the valve is opened. The locking mechanisms 20 and 21 prevent any
movement of the switch rails 3 and 4 to the right as a result of leakage of fluid from the
actuator 6. Movement of the switch rail 3 to the right will move the rod 22 slightly
inwardly so that the inclined surface 26 of its slider 24 slides along the inclined surface
32 on the slider 30 of the other rod 28. This causes the two sliders 24 and 30 to exert an
outward locking force on the surfaces 35 of the channel 34, so that the two sliders wedge
or jam with one another. It should be noted that the right-hand rod 28 will not be
displaced as a result of movement of the right-hand switch rail 4 to the right because the
bracket 15 supporting the rod is not attached to the rail. Thus, the switch rails 3 and 4
will remain in the left-hand position until the supply unit 11 supplies fluid to move the
piston 13 of the right-hand actuator 7 to the right. This moves the rod 28 and its slider
30 out of jamming engagement with the other slider 24.
The roller 27 of the slider 24 reduces friction between the two inclined surfaces
26 and 32 so that these can slide freely over one another. Alternatively, the inclined
surfaces 26 and 32 could be provided with a low friction by other means, such as by a
suitable coating. The outer surfaces 25 and 31 of the sliders 24 and 30 are given a higher
coefficient of friction with the surfaces 35 of the channel 34, such as by roughening, so
that they do not slide along the channel when jammed locked.
Various other forms of locking mechanism are possible that allow free movement
when pulled back but lock when pushed. For example, as shown in Figure 3, the rods 50
and 51 support a respective slider in the form of a clutch plate 52 and 53 with facing
surfaces 54 and 55 having profiled recesses 56 and 57 engaging an eccentric cam 58. The cam 58 is rotatable about an axis transverse to the rods 50 and 51 and is shaped such that
a pushing movement of one rod towards the other causes rotation of the cam in a sense
tending to force the two clutch plates 52 and 53 outwardly against the walls 59 of the
channel 60 in which they slide.
Figure 4 shows a locking mechanism having two rods 70 and 71 displaced
laterally with respect to one another and having their ends interconnected by a pivoted
linkage 72 extending at an angle to the rods. The rods 70 and 71 each have a high
friction bearing surface 73 on their outer faces so that movement of the rods
longitudinally towards one another causes them to be pushed laterally apart into locking
contact with the walls 74 of the channel 75 in which they slide.
Figure 5 shows a locking mechanism similar to that of Figures 1 and 2 except that
the sliders 124 and 130 have been modified each to have a hook portion 224 and 230
respectively at their ends, directed inwardly of the channel 134 towards one another. A
roller 127 is located between opposed faces 126 and 132 of the sliders 124 and 130. It
can be seen that, when either rod 122 or 128 is moved axially towards the other it will
cause the roller 127 to roll along the surfaces 126 and 132 on the sliders 124 and 130,
thereby applying a lateral force pushing them outwardly of the channel 134 and locking
the rods in position. If, however, either rod 122 or 128 is moved away from the other,
it will cause the roller 127 to locate between the two hook portions 224 and 230 so that
the slider on the moved rod will act to pull the other slider, and hence its rod along the
channel 134. This arrangement has the advantage that it will function without the need
for a stretcher bar. It will be appreciated that the invention is not confined to railway points systems
but could be used in other applications where it is necessary to lock two members against movement. The actuator need not be hydraulic but could, for example, be electromechanical or pneumatic.

Claims

1. An actuator arrangement for moving first and second members (3 ,4), the
two members (3,4) being interconnected with one another by a linkage (5) extending
between them, the arrangement including first and second actuator means (6,7) arranged
to bear against respective movable members (3,4) such that actuation of the first actuator
(6) causes both movable members (3,4) to move in one direction and actuation of the
other actuator (7) causes both movable members (3,4) to move in the opposite direction,
and a locking mechanism (20,21) coupled with the first and second actuators (6,7), the
locking mechanism (20,21 ) being arranged to allow free movement in opposite directions
caused by actuation of the first and second actuator means (6,7) respectively but to
prevent movement in either direction when not caused by actuation of the respective
actuator means (6,7).
2. An actuator arrangement according to claim 1, wherein the locking
mechanism (20,21) includes two rods (22,28) movable along their lengths and having
respective sliders (24,30) movable along a channel (34), the sliders (24,30) being
arranged to apply an outward locking force on walls of the channel (34) when one rod
(24,30) is pushed towards the other.
3. An actuator arrangement according to claim 2, wherein the sliders (24,30)
have cooperating inclined faces (26,32).
4. An actuator arrangement according to claim 2, wherein the sliders (24,30)
define opposing inclined surfaces (26,32) and a roller (27) is provided between the inclined faces of the sliders.
5. An actuator arrangement according to claim 4, wherein a hook portion
(224,230) is provided at the remote end of each slider (124,130), the hooks being
arranged to engage with the roller (127) when either rod (122,128) is moved away from
the other.
6. An actuator arrangement according to claim 3, wherein a low friction
coating is provided over each of the cooperating inclined faces of the sliders.
7. An actuator arrangement according to claim 2, wherein the sliders have
facing surfaces (54,55), each defining a profiled recess (56,57) and an eccentric cam (58)
is located between the facing surfaces of the sliders, with each end thereof in engagement
with a respective one of the said profiled recesses (56,57), the eccentric cam (58) being rotatable about an axis extending transversely to the rods.
8. An actuator arrangement according to claim 1, wherein the locking
mechanism includes two rods (70,71) movable along their lengths in a channel (75), the
ends of the rods (70,71) being interconnected by a pivoted linkage (72), the rods and
linkage being arranged to apply an outward locking force on walls of the channel (75)
when one rod is pushed towards the other.
EP01271302A 2000-12-19 2001-12-17 Actuator arrangements Expired - Lifetime EP1345803B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CY20081100364T CY1107378T1 (en) 2000-12-19 2008-03-31 ACTIVATOR PROVISIONS

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB0031023A GB0031023D0 (en) 2000-12-19 2000-12-19 Actuator arrangements
GB0031023 2000-12-19
GB0102061A GB0102061D0 (en) 2001-01-24 2001-01-24 Actuator arrangements
GB0102061 2001-01-24
PCT/GB2001/005557 WO2002049902A1 (en) 2000-12-19 2001-12-17 Actuator arrangements

Publications (2)

Publication Number Publication Date
EP1345803A1 true EP1345803A1 (en) 2003-09-24
EP1345803B1 EP1345803B1 (en) 2008-02-13

Family

ID=26245452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01271302A Expired - Lifetime EP1345803B1 (en) 2000-12-19 2001-12-17 Actuator arrangements

Country Status (10)

Country Link
EP (1) EP1345803B1 (en)
CN (1) CN1209262C (en)
AT (1) ATE385936T1 (en)
AU (1) AU2002222231A1 (en)
CY (1) CY1107378T1 (en)
DE (1) DE60132813T2 (en)
DK (1) DK1345803T3 (en)
ES (1) ES2300306T3 (en)
PT (1) PT1345803E (en)
WO (1) WO2002049902A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8684318B2 (en) 2010-09-16 2014-04-01 Spx International Limited Mechanical lock
CN102358327B (en) * 2011-09-16 2013-11-06 南南铝业股份有限公司 Remote control type automatic switching machine
JP6050798B2 (en) * 2014-10-10 2016-12-21 住友ゴム工業株式会社 Rubber strip manufacturing equipment
FR3059621B1 (en) * 2016-12-01 2019-07-12 Vossloh Cogifer MECHANISM FOR MOVING AND LOCKING IN POSITION OF AT LEAST ONE NEEDLE OF RAIL

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR753077A (en) * 1933-03-24 1933-10-06 Turnout control
FR49259E (en) * 1937-09-07 1939-02-16 Turnout control
FR2536030B1 (en) * 1982-11-16 1986-10-03 Elan ELECTRIC CYLINDER, ESPECIALLY USEFUL FOR THE CONTROL OF MOBILE NEEDLES OF A RAILWAY NEEDLE

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0249902A1 *

Also Published As

Publication number Publication date
CY1107378T1 (en) 2012-12-19
PT1345803E (en) 2008-05-13
CN1487893A (en) 2004-04-07
AU2002222231A1 (en) 2002-07-01
ES2300306T3 (en) 2008-06-16
DE60132813D1 (en) 2008-03-27
DE60132813T2 (en) 2009-02-12
EP1345803B1 (en) 2008-02-13
ATE385936T1 (en) 2008-03-15
DK1345803T3 (en) 2008-06-16
CN1209262C (en) 2005-07-06
WO2002049902A1 (en) 2002-06-27

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