JPS6471675A - Hammer drill - Google Patents

Hammer drill

Info

Publication number
JPS6471675A
JPS6471675A JP23053987A JP23053987A JPS6471675A JP S6471675 A JPS6471675 A JP S6471675A JP 23053987 A JP23053987 A JP 23053987A JP 23053987 A JP23053987 A JP 23053987A JP S6471675 A JPS6471675 A JP S6471675A
Authority
JP
Japan
Prior art keywords
tool
pinion
gear
spring
increased
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
JP23053987A
Other languages
Japanese (ja)
Other versions
JP2595262B2 (en
Inventor
Takashi Oda
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 JP62230539A priority Critical patent/JP2595262B2/en
Publication of JPS6471675A publication Critical patent/JPS6471675A/en
Application granted granted Critical
Publication of JP2595262B2 publication Critical patent/JP2595262B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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  • Percussive Tools And Related Accessories (AREA)

Abstract

PURPOSE: To prevent a sudden drop in boring ability even if a load applied to a tool is increased by arranging a transmission means, which shifts a speed reduction ratio according to a load applied to the tool, in the tool side part beyond a power dividing unit to a hammering driving unit in a rotation driving unit. CONSTITUTION: When a load applied to a tool 8 is increased, gears 62, 63 are retracted against a spring 66 because of an inclination on the side face of a clutch claw. In this process, thrust force is applied from the gears 62, 63 because of frictional engagement in the engaging part between the gear 62 and a pinion 60, so that pinions 60, 61 are also slightly pulled backward against a spring 65. When engagement between the pinion 60 and the gear 62 is released because of retraction of the gear 62, the pinion 60, 61 are instantly returned forward by energization of the spring 65, and the pinion 61 and the gear 63 are engaged with each other. As a result, a speed reduction ratio is increased, and low speed high torque rotation is transmitted to the tool 8. Therefore, the number of revolutions of a motor 2 is not lowered in spite of increase in a load, and the number of hammering to the tool 8 is not reduced.
JP62230539A 1987-09-14 1987-09-14 Hammer drill Expired - Lifetime JP2595262B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62230539A JP2595262B2 (en) 1987-09-14 1987-09-14 Hammer drill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62230539A JP2595262B2 (en) 1987-09-14 1987-09-14 Hammer drill

Publications (2)

Publication Number Publication Date
JPS6471675A true JPS6471675A (en) 1989-03-16
JP2595262B2 JP2595262B2 (en) 1997-04-02

Family

ID=16909338

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62230539A Expired - Lifetime JP2595262B2 (en) 1987-09-14 1987-09-14 Hammer drill

Country Status (1)

Country Link
JP (1) JP2595262B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100621720B1 (en) * 2005-01-19 2006-09-13 계양전기 주식회사 Electric hammer drill

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3843914B2 (en) 2002-08-27 2006-11-08 松下電工株式会社 Hammer drill
JP4326452B2 (en) 2004-10-26 2009-09-09 パナソニック電工株式会社 Impact tool

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220762A (en) * 1975-08-11 1977-02-16 Fujitsu Ltd Gas discharge display panel
JPS61197170A (en) * 1985-02-26 1986-09-01 ローベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Hammer drill

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5220762A (en) * 1975-08-11 1977-02-16 Fujitsu Ltd Gas discharge display panel
JPS61197170A (en) * 1985-02-26 1986-09-01 ローベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Hammer drill

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100621720B1 (en) * 2005-01-19 2006-09-13 계양전기 주식회사 Electric hammer drill

Also Published As

Publication number Publication date
JP2595262B2 (en) 1997-04-02

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