US2182122A - Railway signal control system - Google Patents

Railway signal control system Download PDF

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Publication number
US2182122A
US2182122A US99939A US9993936A US2182122A US 2182122 A US2182122 A US 2182122A US 99939 A US99939 A US 99939A US 9993936 A US9993936 A US 9993936A US 2182122 A US2182122 A US 2182122A
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US
United States
Prior art keywords
wheel
contacts
section
relay
counting
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.)
Expired - Lifetime
Application number
US99939A
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English (en)
Inventor
Griffiths John Balmain
Brown Andrew
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US2182122A publication Critical patent/US2182122A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or train
    • B61L1/16—Devices for counting axles; Devices for counting vehicles
    • B61L1/161—Devices for counting axles; Devices for counting vehicles characterised by the counting methods

Definitions

  • This invention relates to railway or like automatic signal or points control systems of the kind in which the signal and/or points for a particular section of track isor are automatically controlled by the automatic counting of the number of wheels on a train as the train enters a section and as the train leaves the section.
  • a signal is set to danger on the train entering a section and only permitted to indicate that the track is clear if the same number of wheels has been automatically counted out of the section, as was automatically counted into the section.
  • the term signal is to be understood as including any locking means therefor, while the term points is to be understood as including any locking means therefor.
  • the signals may be operated in a fully automatic manner, or may be automatically put to danger when a wheel enters 90 a section and locked in such position until the indication that the section is clear is received, after which the signal may be manually returned to clear.
  • the control of points consists in the prevention of any attempted alteration of the points whilst a train is still in the section.
  • the invention comprises an arrangement in which two sets of contacts only are provided at each end of a section, but in which nevertheless reversal of movement of a wheel whilst passing the contacts is detected and correct signals sent to the counting apparatus.
  • the treadles X and Y when depressed open the circuits of relays A and B respectively and similarly treadles X and Y control the circuits of relays A and B.
  • the arrangements at both ends of the track are similar and consequently corresponding relays and contacts at the right hand side are denoted by the same reference characters as those on the left but with the addition of a prime jointly control equipment contained in the rectangle marked SAC' for receiving in-coming and out-coming impulses and for controlling the signals and/or points accordingly.
  • Positive battery is normally connected to the terminal marked I to which is connected the in-counting relay (not shown).
  • positive battery is normally connected to the terminal marked t to which is connected the out-counting relay (not shown). Both these relays are accordingly normally energised. A break in the circuit of either of them is therefore an impulse, in-counting or out- U counting as the case may be.
  • the details of construction of the equipment SAC form no part of this invention andv accordingly this equipment is not further described.
  • the relay AB is a high speed relay which immediately releases, but the relay AR is a slow releasing relay which does not release in the case of a rapid train.
  • the release of contacts at? does not afiect the circuit for BA since contacts but are in parallel with at.
  • the wheel then passes on, depresses the arm Y and releases the relay B.
  • the release of contact bl has no effect on the circuit since those contacts have previously been paralleled by contacts ao'2.-
  • the release of contacts b2 has no. immediate eifect, since the relay AB is de-energised. in any case. When the wheel leaves the arm X relay A is re-energised.
  • Relay AB is Re-energised because contacts chi and D2 .are both open.
  • relay AB is operated over contacts cal and b2 so that all relays have returned to their normal condition.
  • relays A and AB would be de-energised as before and an in-counting impulse would be recorded.
  • Relay A would be de-energised for sufiicient time to permit relay AR to release.
  • the release of relay B would have no immediate effect and as the wheel moves slowly from the treadle X, contacts al would reclose and would have ample time to re-energize the relay AR before the wheel finally passed off treadle Y, re-energising relays B and AB.
  • a railway or like automaticsignal or points control system comprising a track section, two pairs of contacts arranged for successive and overlapping operation in one of two orders, wheel operated means for operating said contact pairs in one or the other of said orders dependent upon whether a wheel passes in a forward or reverse direction over said wheel operated means, equipment for controlling signals or points, signalling means controlled by said contact pairs for sending into said equipment impulses for counting wheels into or out of said section depending on the order in which said pairs of contacts are operated for controlling said equipment to ensure correct control of said signals or points, means controlled by said pairs of contacts for detecting reversal of direction of a wheel whilst passing said wheel operated means, and means controlled by said detecting means for operating said signalling means to ensure correct control of the signals or points by said equipment in event of such a reversal in direction.
  • a railway or like automatic signal or points control system comprising a track section, wheel operated means at one end thereof, control equipment for controlling signals or points, signalling means controlled by said wheel operated means for sending into said control equipment impulses for counting wheels into said section in response to passage of a wheel over said Wheel operated means in one direction and other impulses for counting wheels out of said section in response to p ssage or" a wheel over said wheel operated means in the reverse direction, direction reversal detecting means controlled by said Wheel operated means for detecting reversal of direction of movement of a wheel when passing said wheel operated means, and means controlled by said Wheel operated means for bringing into operation aid direction reversal detecting means in response to the condition that the speed of motion of a wheel is low enough to render such reversal possible.
  • a system as claimed in claim 3 in which said wheel operated means comprises two relays, circuits for said relays, means for breaking the circuits of said relays in succession and in over lapping relation, and said direction reversal detecting means comprises two slow releasing relays operatively associated with said first named relays each adapted to release in response to the condition that the circuit of said first mentioned relays is broken for greater than a predetermined time.
  • a system as claimedin claim 1 comprising other wheel operated means and means controlled thereby at the other end of the said section, said last named means being connected with said signalling means to send signals to said control equipment for counting wheels into and out of said section.
  • a railway or like automatic signal or points control system comprising a track section, a single main control equipment for counting the number of wheels entering and leaving the section, and for controlling signals or points accordingly, separate normally closed Wheel operated impulsin'g contacts at each end of the section operative in successive overlapping relation for operating said main control equipment, separate auxiliary equipment cooperating with said contacts at each end of. said section for sending to the said control equipment impulses indicating the number of wheels entering the section irrespective of the particular end of the section at which they enter and impulses indicating the number of wheels leaving the section irrespective of the particular end of the section at which they leave.
  • a railway or like automatic signal or points control system comprising two pair of normally closed wheel operated impulsing contacts situated at the end of a track section, said contacts being arranged for successive overlapping operation in one of two orders dependent upon the direction of passage of a wheel thereover, and
  • signal transmitting means operatively associated with said contacts for transmitting signals dependent upon the order of operation of said contacts.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Operating, Guiding And Securing Of Roll- Type Closing Members (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
US99939A 1935-09-13 1936-09-09 Railway signal control system Expired - Lifetime US2182122A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB25448/35A GB447866A (en) 1935-09-13 1935-09-13 Improvements in or relating to railway and like signalling systems

Publications (1)

Publication Number Publication Date
US2182122A true US2182122A (en) 1939-12-05

Family

ID=10227832

Family Applications (1)

Application Number Title Priority Date Filing Date
US99939A Expired - Lifetime US2182122A (en) 1935-09-13 1936-09-09 Railway signal control system

Country Status (3)

Country Link
US (1) US2182122A (de)
DE (1) DE686264C (de)
GB (1) GB447866A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3144225A (en) * 1960-03-25 1964-08-11 Int Standard Electric Corp Arrangement for evaluating the pulses in railway axle-counting systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3169734A (en) * 1959-04-21 1965-02-16 Fryba Josef Rail track traffic indicator system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3144225A (en) * 1960-03-25 1964-08-11 Int Standard Electric Corp Arrangement for evaluating the pulses in railway axle-counting systems

Also Published As

Publication number Publication date
GB447866A (en) 1936-05-27
DE686264C (de) 1940-01-06

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