JPS555201A - Device for preventing abnormal rotation of portable electric drill - Google Patents
Device for preventing abnormal rotation of portable electric drillInfo
- 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
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
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)
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 |
-
1978
- 1978-02-18 JP JP1798178A patent/JPS555201A/en active Pending
Cited By (6)
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 |
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