Title:
HYDRAULIC HAMMERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2005/058550
Kind Code:
A1
Abstract:
A hydraulic hammering device where a reciprocating hammering piston hammers a hammering piston has a stroke control valve and a holding mechanism. The stroke control valve is switched by the difference in pressures in upper and lower chambers caused in hammering by the difference in hardness of objects to be hammered. The holding mechanism holds the stroke control valve at the switched position. The hydraulic hammering device is constructed such that a coming hammering stroke is controlled in at least two stages based on a switched position of the stroke control valve. The hydraulic hammering device has a pre-control valve. When an object is hammered, the pre-control valve causes the upper chamber of the hammering piston and a drive chamber of the stroke control valve to communicate, making a hydraulic signal to act from the upper chamber to the drive chamber.
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Inventors:
HORI OSAMU (JP)
YAUCHI KENICHIRO (JP)
YAUCHI KENICHIRO (JP)
Application Number:
PCT/JP2004/018571
Publication Date:
June 30, 2005
Filing Date:
December 13, 2004
Export Citation:
Assignee:
KONAN ELECTRIC CO (JP)
HORI OSAMU (JP)
YAUCHI KENICHIRO (JP)
HORI OSAMU (JP)
YAUCHI KENICHIRO (JP)
International Classes:
B25D9/04; B25D9/26; (IPC1-7): B25D9/26
Foreign References:
| JP2003159667A | 2003-06-03 | |||
| JP2000052276A | 2000-02-22 |
Attorney, Agent or Firm:
Kurauchi, Giro (14-3 Nishitemma 4-chom, Kita-ku Osaka-shi Osaka 47, JP)
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