JPS54142684A - Underground conductor protecting device - Google Patents

Underground conductor protecting device

Info

Publication number
JPS54142684A
JPS54142684A JP5005178A JP5005178A JPS54142684A JP S54142684 A JPS54142684 A JP S54142684A JP 5005178 A JP5005178 A JP 5005178A JP 5005178 A JP5005178 A JP 5005178A JP S54142684 A JPS54142684 A JP S54142684A
Authority
JP
Japan
Prior art keywords
relay
tool
bell
contact
time
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.)
Pending
Application number
JP5005178A
Other languages
Japanese (ja)
Inventor
Isao Hori
Hideo Kimura
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.)
Hitachi Plant Technologies Ltd
Original Assignee
Hitachi Plant Technologies 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 Hitachi Plant Technologies Ltd filed Critical Hitachi Plant Technologies Ltd
Priority to JP5005178A priority Critical patent/JPS54142684A/en
Publication of JPS54142684A publication Critical patent/JPS54142684A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

PURPOSE:To prevent an electric conductor from being damaged during underground installation operation by sending low voltage current between a tool and a conductor so that contact between them can be detected. CONSTITUTION:A secondary side coil is connected through a relay 2 to a contact terminal 5 of a tool's main body and a contact terminal of an underground installation object 6, and it is operated in the condition that an output voltage of a normal transformer is impressed on it. On the other hand, a direct circuit for a all-time-open contact 22 of a relay 2, a bell switch 7 and a bell 8 is connected to a power source through a power source switch 1. In such a mechanism, when the relay 2 is being driven, if the tool contacted an underground laid object, the all-time-open contact 22 is closed, the bell switch 7 is closed and the bell 8 is sounded to give a warning. At the same time, by operation of the relay 2, the all-time-close contact 21 is opened and power supply to an electric tool M is discontinued.
JP5005178A 1978-04-28 1978-04-28 Underground conductor protecting device Pending JPS54142684A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5005178A JPS54142684A (en) 1978-04-28 1978-04-28 Underground conductor protecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5005178A JPS54142684A (en) 1978-04-28 1978-04-28 Underground conductor protecting device

Publications (1)

Publication Number Publication Date
JPS54142684A true JPS54142684A (en) 1979-11-07

Family

ID=12848184

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5005178A Pending JPS54142684A (en) 1978-04-28 1978-04-28 Underground conductor protecting device

Country Status (1)

Country Link
JP (1) JPS54142684A (en)

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