JPS57102709A - Magnetic boring machine - Google Patents

Magnetic boring machine

Info

Publication number
JPS57102709A
JPS57102709A JP17641580A JP17641580A JPS57102709A JP S57102709 A JPS57102709 A JP S57102709A JP 17641580 A JP17641580 A JP 17641580A JP 17641580 A JP17641580 A JP 17641580A JP S57102709 A JPS57102709 A JP S57102709A
Authority
JP
Japan
Prior art keywords
motor
circuit
magnetic
resistors
electric magnet
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
JP17641580A
Other languages
Japanese (ja)
Inventor
Takashi Ishizuka
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.)
Koki Holdings Co Ltd
Original Assignee
Hitachi Koki 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 Hitachi Koki Co Ltd filed Critical Hitachi Koki Co Ltd
Priority to JP17641580A priority Critical patent/JPS57102709A/en
Publication of JPS57102709A publication Critical patent/JPS57102709A/en
Pending legal-status Critical Current

Links

Landscapes

  • Drilling And Boring (AREA)

Abstract

PURPOSE: To prevent such an accident with a magnetic boring machine as being swung out by furnishing a magnetic flux sensing device at the magnetic circuit of an electric magnet base and refraining from supplying current to the motor- driven drilling machine in case the attracting force is not sufficient or none at all.
CONSTITUTION: Having a starter swtich 14 for the motor 15 to drive a motor- driven drilling machine, a magnetic sensind device 22 is composed of a hole element 10, constant-current power supply device 23, resistors 24, 25 and an amplifier circuit 26. This amplifier circuit 26 is composed of resistors 27-29 and a calculating circuit 30 while comparator circuit 31 is composed of resistors 32, 34, 35, a variable resistor 33 and a calculating circuit 36. The electric magnet base is fixed in attraction to a work to be processed in such arrangement that sufficiency of attractive force can be known from the lighting of an LED11 is so and that the LED will not light up if there is not sufficient attractive force. Even though the starter switch 14 for the motor 15 is turned on with the state above held, the oscillator circuit 49 does not operate and no power is supplied to the motor 15, so that the boring work can be carried out.
COPYRIGHT: (C)1982,JPO&Japio
JP17641580A 1980-12-12 1980-12-12 Magnetic boring machine Pending JPS57102709A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17641580A JPS57102709A (en) 1980-12-12 1980-12-12 Magnetic boring machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17641580A JPS57102709A (en) 1980-12-12 1980-12-12 Magnetic boring machine

Publications (1)

Publication Number Publication Date
JPS57102709A true JPS57102709A (en) 1982-06-25

Family

ID=16013282

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17641580A Pending JPS57102709A (en) 1980-12-12 1980-12-12 Magnetic boring machine

Country Status (1)

Country Link
JP (1) JPS57102709A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03126512U (en) * 1990-01-26 1991-12-19
EP2251154A1 (en) 2009-05-13 2010-11-17 C. & E. Fein GmbH Magnetic drill stand with retention force monitoring
JP2020131322A (en) * 2019-02-15 2020-08-31 日東工器株式会社 Portable type machine tool
JP2020131321A (en) * 2019-02-15 2020-08-31 日東工器株式会社 Portable type machine tool
WO2021039186A1 (en) * 2019-08-28 2021-03-04 日東工器株式会社 Portable machining tool
CN113600870A (en) * 2021-09-06 2021-11-05 永康市晓诚电器有限公司 Electric tool with protection device

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03126512U (en) * 1990-01-26 1991-12-19
EP2251154A1 (en) 2009-05-13 2010-11-17 C. & E. Fein GmbH Magnetic drill stand with retention force monitoring
DE102009022333A1 (en) 2009-05-13 2010-11-18 C. & E. Fein Gmbh Magnetic drill stand with monitoring of the holding force
US8545139B2 (en) 2009-05-13 2013-10-01 C & E Fein Gmbh Magnetic drilling stand with holding force monitoring
JP2020131322A (en) * 2019-02-15 2020-08-31 日東工器株式会社 Portable type machine tool
JP2020131321A (en) * 2019-02-15 2020-08-31 日東工器株式会社 Portable type machine tool
WO2021039186A1 (en) * 2019-08-28 2021-03-04 日東工器株式会社 Portable machining tool
JPWO2021039186A1 (en) * 2019-08-28 2021-03-04
GB2600572B (en) * 2019-08-28 2023-03-29 Nitto Kohki Co Portable machine tool
AU2020338309B2 (en) * 2019-08-28 2024-02-08 Nitto Kohki Co., Ltd. Portable machining tool
CN113600870A (en) * 2021-09-06 2021-11-05 永康市晓诚电器有限公司 Electric tool with protection device

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