JPS6471673A - Power tool - Google Patents

Power tool

Info

Publication number
JPS6471673A
JPS6471673A JP62230540A JP23054087A JPS6471673A JP S6471673 A JPS6471673 A JP S6471673A JP 62230540 A JP62230540 A JP 62230540A JP 23054087 A JP23054087 A JP 23054087A JP S6471673 A JPS6471673 A JP S6471673A
Authority
JP
Japan
Prior art keywords
turned
circuit
motor
switch
pressure
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.)
Granted
Application number
JP62230540A
Other languages
Japanese (ja)
Other versions
JP2624970B2 (en
Inventor
Yoshinobu Sakamura
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP62230540A priority Critical patent/JP2624970B2/en
Publication of JPS6471673A publication Critical patent/JPS6471673A/en
Application granted granted Critical
Publication of JP2624970B2 publication Critical patent/JP2624970B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Portable Power Tools In General (AREA)

Abstract

PURPOSE: To always stop a motor at a predetermined torque value so as to prevent defective fastening and breakage of a thread because of overwinding by arranging a correction means, which automatically corrects torque calculation for an output shaft torque in compliance with a condition change, in a control means. CONSTITUTION: A motor 2 is turned when a switch 9 is turned on and an electronic switch 14 is turned on in an initial condition. A temperature, a pressure, and a current at this time are detected by means of respective sensors 13, 4, 12. An output from the current sensor 12 is amplified in an amplifying circuit (correction means) 17 inside a control circuit 18 so as to be transmitted to a comparing circuit 15. In this process, an amplification ratio and a bias voltage of the amplifying circuit 17 are corrected at a predetermined ratio on the basis of outputs from the temperature sensor 13 and the pressure sensor 4. Therefore, a signal amplified by means of the amplifying circuit 17 is proportional to output shaft torque of a driver despite fluctuation in temperature or pressure. This signal is compared with a reference voltage from a reference voltage generating circuit 16 by means of the comparing circuit 15, and when both of them correspond to each other, the switch 14 is turned off so as to stop the motor 12.
JP62230540A 1987-09-14 1987-09-14 Electric tool Expired - Lifetime JP2624970B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62230540A JP2624970B2 (en) 1987-09-14 1987-09-14 Electric tool

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62230540A JP2624970B2 (en) 1987-09-14 1987-09-14 Electric tool

Publications (2)

Publication Number Publication Date
JPS6471673A true JPS6471673A (en) 1989-03-16
JP2624970B2 JP2624970B2 (en) 1997-06-25

Family

ID=16909355

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62230540A Expired - Lifetime JP2624970B2 (en) 1987-09-14 1987-09-14 Electric tool

Country Status (1)

Country Link
JP (1) JP2624970B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002137178A (en) * 2000-08-24 2002-05-14 Hilti Ag Power tool with safety clutch
JP2003305667A (en) * 2002-04-12 2003-10-28 Nidec Shibaura Corp Power tool
JP2009083045A (en) * 2007-09-28 2009-04-23 Panasonic Electric Works Co Ltd Impact rotary tool
JP2011212799A (en) * 2010-03-31 2011-10-27 Hitachi Koki Co Ltd Power tool
US9314908B2 (en) 2009-07-29 2016-04-19 Hitachi Koki Co., Ltd. Impact tool
CN116906648A (en) * 2023-07-29 2023-10-20 江苏江华阀业有限公司 Control device of electric valve

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5422640A (en) * 1977-07-19 1979-02-20 Tsubakimoto Chain Co Pallet for placing slender article and method of using said pallet and its device
JPS63288673A (en) * 1987-05-20 1988-11-25 三洋機工株式会社 Nut runner

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5422640A (en) * 1977-07-19 1979-02-20 Tsubakimoto Chain Co Pallet for placing slender article and method of using said pallet and its device
JPS63288673A (en) * 1987-05-20 1988-11-25 三洋機工株式会社 Nut runner

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002137178A (en) * 2000-08-24 2002-05-14 Hilti Ag Power tool with safety clutch
JP2003305667A (en) * 2002-04-12 2003-10-28 Nidec Shibaura Corp Power tool
JP2009083045A (en) * 2007-09-28 2009-04-23 Panasonic Electric Works Co Ltd Impact rotary tool
US9314908B2 (en) 2009-07-29 2016-04-19 Hitachi Koki Co., Ltd. Impact tool
JP2011212799A (en) * 2010-03-31 2011-10-27 Hitachi Koki Co Ltd Power tool
CN116906648A (en) * 2023-07-29 2023-10-20 江苏江华阀业有限公司 Control device of electric valve
CN116906648B (en) * 2023-07-29 2026-01-16 江苏江华阀业有限公司 Control device of electric valve

Also Published As

Publication number Publication date
JP2624970B2 (en) 1997-06-25

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