JPS5646025A - Drop hammer - Google Patents

Drop hammer

Info

Publication number
JPS5646025A
JPS5646025A JP12289479A JP12289479A JPS5646025A JP S5646025 A JPS5646025 A JP S5646025A JP 12289479 A JP12289479 A JP 12289479A JP 12289479 A JP12289479 A JP 12289479A JP S5646025 A JPS5646025 A JP S5646025A
Authority
JP
Japan
Prior art keywords
oil
motor
valve
switching valve
hydraulic motor
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
JP12289479A
Other languages
Japanese (ja)
Other versions
JPS5930853B2 (en
Inventor
Giichi Nabana
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 JP12289479A priority Critical patent/JPS5930853B2/en
Publication of JPS5646025A publication Critical patent/JPS5646025A/en
Publication of JPS5930853B2 publication Critical patent/JPS5930853B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Abstract

PURPOSE: To make unnecessary an intermittent transmission device such as a clutch between an oil-hydraulic motor and a winch drum and thus to reduce the occurrence of mechanical noises.
CONSTITUTION: When the 1st switching valve 23 is transferred from the center to the right side, the valve 23 is placed in the continuity to an oil-hydraulic motor 21. The oil discharged from an oil-hydraulic pump 22 moves from the 1st switching valve 23 to a check valve 24, the oil-hydraulic motor 21, the 2nd pilot valve 27, the 1st switching valve 23 and an oil tank 28 in this order, while the motor 21 rotates normally in the direction of an arrow (a solic line). A wire rope 19 is inserted by a winch drum 16 and thereby an iron weight 20 is raised. When the 2nd switching valve 30 is transferred from the right side to the left, it is placed in the continuity to the oil-hydraulic motor 21, thereby the 3rd pilot valve 29 is turned open, a closed circuit connecting both ends of the motor 21 is formed, the motor 21 rotates at a high speed, and the iton weight 20 drops down.
COPYRIGHT: (C)1981,JPO&Japio
JP12289479A 1979-09-25 1979-09-25 drop hammer Expired JPS5930853B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12289479A JPS5930853B2 (en) 1979-09-25 1979-09-25 drop hammer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12289479A JPS5930853B2 (en) 1979-09-25 1979-09-25 drop hammer

Publications (2)

Publication Number Publication Date
JPS5646025A true JPS5646025A (en) 1981-04-27
JPS5930853B2 JPS5930853B2 (en) 1984-07-30

Family

ID=14847257

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12289479A Expired JPS5930853B2 (en) 1979-09-25 1979-09-25 drop hammer

Country Status (1)

Country Link
JP (1) JPS5930853B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0280152U (en) * 1988-12-07 1990-06-20
JP2002327434A (en) * 2001-05-07 2002-11-15 Nakamine Shinji Concrete pile and its manufacturing method and leader device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0280152U (en) * 1988-12-07 1990-06-20
JP2002327434A (en) * 2001-05-07 2002-11-15 Nakamine Shinji Concrete pile and its manufacturing method and leader device

Also Published As

Publication number Publication date
JPS5930853B2 (en) 1984-07-30

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