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GB556860A - Improvements in or relating to electrical signalling systems - Google Patents

Improvements in or relating to electrical signalling systems

Info

Publication number
GB556860A
GB556860A GB538242A GB538242A GB556860A GB 556860 A GB556860 A GB 556860A GB 538242 A GB538242 A GB 538242A GB 538242 A GB538242 A GB 538242A GB 556860 A GB556860 A GB 556860A
Authority
GB
United Kingdom
Prior art keywords
relays
signalling systems
class
relating
group
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
GB538242A
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric 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 Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB538242A priority Critical patent/GB556860A/en
Publication of GB556860A publication Critical patent/GB556860A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B19/00—Mining-hoist operation
    • B66B19/06—Applications of signalling devices

Landscapes

  • Selective Calling Equipment (AREA)

Abstract

556,860. Electric signalling systems. AUTOMATIC TELEPHONES & ELECTRIC CO., Ltd., and THOMPSON, G. W. April 22, 1942, No. 5382. Drawings to Specification. [Class 40 (i)] In a mine shaft signalling system in which a step-by-step switch controls the indicator circuits, as described for instance in Specification 510,612, a group of relays is provided, one for each destination signal, to ensure that such signals are maintained until the end of the wind in spite of action and possibly caution signals that may be received subsequently, the relays being interlocked however, so that an incorrect destination signal may be cancelled by the transmission of the correct one. The group of relays is arranged as a unit which may be readily wired between the switch contacts and the indicator. Specification 193,128, [Class 40 (i)], is referred to.
GB538242A 1942-04-22 1942-04-22 Improvements in or relating to electrical signalling systems Expired GB556860A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB538242A GB556860A (en) 1942-04-22 1942-04-22 Improvements in or relating to electrical signalling systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB538242A GB556860A (en) 1942-04-22 1942-04-22 Improvements in or relating to electrical signalling systems

Publications (1)

Publication Number Publication Date
GB556860A true GB556860A (en) 1943-10-26

Family

ID=9795091

Family Applications (1)

Application Number Title Priority Date Filing Date
GB538242A Expired GB556860A (en) 1942-04-22 1942-04-22 Improvements in or relating to electrical signalling systems

Country Status (1)

Country Link
GB (1) GB556860A (en)

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