US2367258A - Electric signaling system - Google Patents

Electric signaling system Download PDF

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Publication number
US2367258A
US2367258A US468625A US46862542A US2367258A US 2367258 A US2367258 A US 2367258A US 468625 A US468625 A US 468625A US 46862542 A US46862542 A US 46862542A US 2367258 A US2367258 A US 2367258A
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US
United States
Prior art keywords
loop
relay
contacts
earth
battery
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Expired - Lifetime
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US468625A
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English (en)
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Bates Ernest Frederick
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Individual
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Individual
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults

Definitions

  • This invention relates to electric signaling systems. exclusivelyapplicable to fire alarm and analogous systems in which a pluralityv orst'reet boxesis connected in a single circuit to a central station.
  • an electric signaling system comprising a first battery at a central-station connectedto a closed loop connecting a plurality of substations, a supervisory relay connected at the central station in one leg of the loop so as to be normally energi'sed by current in the closed loop, a relay at the central station connected in the other legof the loop, a second battery connected in series aiding to the first battery, one pole of said second battery being connected to the pole of said first battery adjacent to said second relay and the other pole of said second battery being connected to earth, means at each substation for making a connection to earth when signaling from said substation is to take place, and two sets of signaling contacts at each substation operated simultaneously, one set being situated in the closed loop and another set situated between said connection to earth and said closed loop.
  • the relay A In the normal operation of the circuit, the relay A is operated in a current from thebattery AB over the closed loop.
  • Relay B may also be operated by the closed loop current, or if desired maybe shunted out from the closed loop and the shunt removed only if the loop be broken and a street box signals over the leg of the loop in which relay B is connected.
  • a convenient arrangement for this purpose is a rectifier MRB connected in parallel with relay B and poled in such direction as to oifer low resistance to the current in the closed loop.
  • This rectifier may conveniently be a metal rectifier such as the well known selenium rectifier.
  • Relay A responds to the opening and closing of the contacts in a circuit from earth, contacts KE, contacts SE, contacts SL, relay A, battery AB, battery BB. earth.
  • Relay B also responds in a circuit from earth, contacts SE, relay B, battery BB, earth. (If rectifier MRB is provided, relay B first operates in this circult and then responds to the opening and closing of the signaling contacts.) Contacts al and bi cause records to be made, as for example by perforating a paper tape in recorders RBI and REZ.
  • relay A Will continue to respond to signals from box X whilst relay B will respond to signals from box Y. If the second box to commence signaling be situated between box X and relay A, relay B will continue to respond to signals from box X whilst relay A will respond to signals from the second box. boxes may signal concurrently and the codes be correctly received at the central station.
  • relay A de-energises and at its contacts a2 closes an alarm circuit BK as in known systems. There is, however, no necessity for any rearrangement of the circuits at the central station. Signaling from a street box can take place in the same manner as before a break, relay A or relay B responding according to which side of the break in the box that is signaling.
  • relay B should be shunted by a rectifier MRB offering low resistance to the normal loop current from battery AB.
  • This rectifier offers high resistance to the current from battery BB to the earth at E, and thus relay B will no longer be shunted and will energise.
  • Delay means consisting of a delay action relay DL are provided in this circuit whereby, when the circuit has been closed for a longer period than occurs during normal signaling from a box, an alarm will be given, as for instance by closing of alarm bell circuit as shown.
  • Contacts BO may be provided at each box which in known manner are normally closed to short circuit the contacts in the loop but are opened when the mechanism of the box is operated.
  • the present invention reduces the necessity for the use of the non-interfering succession feature since it permits of two boxes sending signals concurrently without risk of mutilation, or interference.
  • a separate battery such as AB is used for each loop from a central station. This is because if a battery common to a plurality of loops were used, an earth on one loop might interfere with signaling on another loop.
  • the battery AB and the battery BB may be common to a plurality of closed loops.
  • the resistances RA and RB may be inserted in a loop to reduce the current drain on the battery AB.
  • Two boxes X and Y are shown to illustrate two different forms that the sub-stations may take. The two forms are equivalent and all the boxes in a system may be of either type.
  • An electric signaling system comprising a first battery at a central station connected to a closed loop connecting a plurality of sub-stations, a supervisory relay connected at the central station in one leg of the loop so as to be normally energized by current in the closed loop, a second relay at the central station connected in the other leg of the loop, a rectifier adapted to offer a lower .resistance connected in shunt to said second relay,
  • a second battery connected in series aiding to the first battery, one pole of said second battery being connected to the pole of said first battery adjacent to said second relay and the other pole of said second battery being connected to earth,

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Alarm Systems (AREA)
  • Fire Alarms (AREA)
  • Interface Circuits In Exchanges (AREA)
US468625A 1942-04-30 1942-12-11 Electric signaling system Expired - Lifetime US2367258A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB254967X 1942-04-30
GB110942X 1942-09-11

Publications (1)

Publication Number Publication Date
US2367258A true US2367258A (en) 1945-01-16

Family

ID=26248048

Family Applications (1)

Application Number Title Priority Date Filing Date
US468625A Expired - Lifetime US2367258A (en) 1942-04-30 1942-12-11 Electric signaling system

Country Status (5)

Country Link
US (1) US2367258A (en)van)
BE (1) BE468184A (en)van)
CH (1) CH254967A (en)van)
FR (1) FR932231A (en)van)
GB (2) GB557077A (en)van)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531391A (en) * 1945-10-19 1950-11-28 Int Standard Electric Corp Fire alarm system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531391A (en) * 1945-10-19 1950-11-28 Int Standard Electric Corp Fire alarm system

Also Published As

Publication number Publication date
FR932231A (fr) 1948-03-16
GB557077A (en) 1943-11-03
BE468184A (en)van)
CH254967A (de) 1948-05-31
GB560007A (en) 1944-03-15

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