GB761247A - Improvements in or relating to electro-magnetic indicators - Google Patents

Improvements in or relating to electro-magnetic indicators

Info

Publication number
GB761247A
GB761247A GB2311553D GB2311553D GB761247A GB 761247 A GB761247 A GB 761247A GB 2311553 D GB2311553 D GB 2311553D GB 2311553 D GB2311553 D GB 2311553D GB 761247 A GB761247 A GB 761247A
Authority
GB
United Kingdom
Prior art keywords
energized
fixed
electromagnet
oct
disc
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
Application number
GB2311553D
Inventor
John Spreadborough
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.)
Plessey Co Ltd
Original Assignee
Plessey Co 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
Application filed by Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB2311553D priority Critical patent/GB761247A/en
Publication of GB761247A publication Critical patent/GB761247A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/24—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission with indicator element moving about a pivot, e.g. hinged flap or rotating vane
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator
    • H04M3/64—Arrangements for signalling the number or class of the calling line to the operator

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

761,247. Electric selective signalling systems. PLESSEY CO., Ltd. Oct. 13, 1954 [Oct. 13, 1953], No. 28115/53. Class 40 (1). A three-position indicator has a disc 1 provided on the upper face with six zones of 60 degrees each, each zone having distinguishing markings, and fixed on a shaft 2 rotatably mounted in a frame 3. A permanent magnet 4 is fixed to the shaft 2 and by means of a polepiece 8 on an electromagnet 5 is caused to rotate in a clockwise or counter-clockwise direction according to which part of the centretapped winding 7 is energized. A permanent magnet 9, arranged at right-angles to the energized positions of the magnet 4, is fixed to the frame 3 and causes the disc 1 to be returned to the neutral position when the electromagnet is de-energized. The energized positions are determined by stops 11, 12. The casing 13 has an escutcheon 15 with two diametrically-opposed transparent portions. Specification 730,591 is referred to.
GB2311553D 1953-10-13 1953-10-13 Improvements in or relating to electro-magnetic indicators Expired GB761247A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2311553D GB761247A (en) 1953-10-13 1953-10-13 Improvements in or relating to electro-magnetic indicators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2311553D GB761247A (en) 1953-10-13 1953-10-13 Improvements in or relating to electro-magnetic indicators

Publications (1)

Publication Number Publication Date
GB761247A true GB761247A (en) 1956-11-14

Family

ID=31971925

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2311553D Expired GB761247A (en) 1953-10-13 1953-10-13 Improvements in or relating to electro-magnetic indicators

Country Status (1)

Country Link
GB (1) GB761247A (en)

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