Title:
FLUID PRESSURE HAMMERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/026571
Kind Code:
A1
Abstract:
In this fluid pressure hammering device, which automatically switches/controls the stroke of a piston in accordance with the rock quality of a rock to be pulverized, control accuracy is increased. A strike-switching pilot hole (40) for removing high-pressure oil during hammering is provided to a reversal chamber (5). By means of a fluid ejection valve (41) that operates by incurring the hydraulic pressure from the stroke-switching pilot hole (40), oil is successively collected in a fluid chamber (32) provided to a stroke switching valve (30), and when the amount of oil in the fluid chamber (32) exceeds a baseline amount, short strokes are switched to long strokes by means of the switching of the stroke switching valve (30).
Inventors:
HIROSE NORIO (JP)
Application Number:
PCT/JP2011/069267
Publication Date:
March 01, 2012
Filing Date:
August 26, 2011
Export Citation:
Assignee:
TEISAKU KK (JP)
HIROSE NORIO (JP)
HIROSE NORIO (JP)
International Classes:
B25D9/26; E21B1/26
Foreign References:
| JP2004082257A | 2004-03-18 | |||
| JPH0493185A | 1992-03-25 | |||
| JP2003159667A | 2003-06-03 | |||
| DE10237407A1 | 2004-04-22 | |||
| DE19812510A1 | 1999-09-23 | |||
| KR20040095121A | 2004-11-12 |
Attorney, Agent or Firm:
OKADA PATENT & TRADEMARK OFFICE, P. C. (JP)
Patent business corporation Okada international patent firm (JP)
Patent business corporation Okada international patent firm (JP)
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