JPS555201A - Device for preventing abnormal rotation of portable electric drill - Google Patents

Device for preventing abnormal rotation of portable electric drill

Info

Publication number
JPS555201A
JPS555201A JP1798178A JP1798178A JPS555201A JP S555201 A JPS555201 A JP S555201A JP 1798178 A JP1798178 A JP 1798178A JP 1798178 A JP1798178 A JP 1798178A JP S555201 A JPS555201 A JP S555201A
Authority
JP
Japan
Prior art keywords
switch
motor
drill
spring
portable electric
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
JP1798178A
Other languages
Japanese (ja)
Inventor
Katsushige Ito
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP1798178A priority Critical patent/JPS555201A/en
Publication of JPS555201A publication Critical patent/JPS555201A/en
Pending legal-status Critical Current

Links

Landscapes

  • Drilling And Boring (AREA)

Abstract

PURPOSE: To enable to use a drill safely by providing an abnormal rotation detecting switch and cutting electric source automatically when a biting of a drill bit is caused during the portable electric drill is used.
CONSTITUTION: A motor in a drill main frame 1 is rotated when a magnetic switch 4 is closed by a push-button switch 5. A rotation-preventing switch 8 is provided in an electric circuit for the motor, and when a biting of a drill bit is caused during rotating, the rotor portion of the motor frame 1 continues to rotate in the same direction by inertia and a lever 10 receiving a spring strikes a fitting metal 9 for the switch 8 against the biasing force of the spring 16, and thereby, the contact for the switch 8 is opened and the exciting current for the motor is cut. The operation of the switch 8 may be adjusted by regulating a spring 16 with an adjusting means 14.
COPYRIGHT: (C)1980,JPO&Japio
JP1798178A 1978-02-18 1978-02-18 Device for preventing abnormal rotation of portable electric drill Pending JPS555201A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1798178A JPS555201A (en) 1978-02-18 1978-02-18 Device for preventing abnormal rotation of portable electric drill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1798178A JPS555201A (en) 1978-02-18 1978-02-18 Device for preventing abnormal rotation of portable electric drill

Publications (1)

Publication Number Publication Date
JPS555201A true JPS555201A (en) 1980-01-16

Family

ID=11958888

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1798178A Pending JPS555201A (en) 1978-02-18 1978-02-18 Device for preventing abnormal rotation of portable electric drill

Country Status (1)

Country Link
JP (1) JPS555201A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5401124A (en) * 1991-04-12 1995-03-28 Robert Bosch Gmbh Hand-held power tool with jamming-detection sensor
US7395871B2 (en) * 2003-04-24 2008-07-08 Black & Decker Inc. Method for detecting a bit jam condition using a freely rotatable inertial mass

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5401124A (en) * 1991-04-12 1995-03-28 Robert Bosch Gmbh Hand-held power tool with jamming-detection sensor
US7395871B2 (en) * 2003-04-24 2008-07-08 Black & Decker Inc. Method for detecting a bit jam condition using a freely rotatable inertial mass
US7487845B2 (en) * 2003-04-24 2009-02-10 Black & Decker Inc. Safety mechanism for a rotary hammer
US7730963B2 (en) 2003-04-24 2010-06-08 Black & Decker Inc. Safety mechanism for a rotary hammer
US7938194B2 (en) 2003-04-24 2011-05-10 Black & Decker Inc. Safety mechanism for a rotary hammer
US8555997B2 (en) 2003-04-24 2013-10-15 Black & Decker Inc. Safety mechanism for a rotary hammer

Similar Documents

Publication Publication Date Title
TW326409B (en) Method of automatically adjusting the crushing gap of a crusher and the crushing apparatus
JPS57146500A (en) Controlling device for small-sized press
JPS5695247A (en) Image forming device
JPS5325783A (en) Operation supervisary unit for electrically operated valve
JPS555201A (en) Device for preventing abnormal rotation of portable electric drill
JPS5297246A (en) Air conditioner
GB2008873A (en) Protection means for a device driven by an electric motor
JPH0752067A (en) Battery type cutting tool
JPS54146073A (en) Screw-system sand-sediment drawing device operation method
KR910005389Y1 (en) Safety device for portable electric plane
JPS537893A (en) Apparatus for switching automatically and manually
GB1521345A (en) Full rotation type sheet web shearing machine
JPS5258186A (en) Main shaft unit equipped with eccentric positioning device
JPS54106357A (en) Electric shaver
JPS5765528A (en) Device for opening and closing shutter of ventilating fan
JPS51142314A (en) Shutter blade opening and closing device in an electric shuttering app aratus
SU1260181A1 (en) Torque wrench
JPS54158918A (en) Power source switch device of motor drive device in camera
JPS54149989A (en) Pipe cutting controlling apparatus
JPS5418511A (en) Device for controlling electric motor vehicle
JPS521781A (en) Reduction device of an electric drill
JPS54101582A (en) Cutter device
JPS57120279A (en) Floppy disk device
JPS5555455A (en) Tape running state detection mechanism in tape player
JPS5266064A (en) Rotary electric shaver