Title:
IMPACT-DRIVEN TOOL
Document Type and Number:
WIPO Patent Application WO/2015/092875
Kind Code:
A1
Abstract:
This impact-driven tool is provided with a cylinder and a piston which is inserted in the cylinder in a slidable manner and which has a large-diameter section. The cylinder is provided with: one end chamber which is a space defined by the outer surface of the piston, which is located closer to the one axial end side than the large-diameter section of the piston, and by the inner surface of the cylinder; the other end chamber which is a space defined by the outer surface of the piston, which is located closer to the other axial end side than the large-diameter section of the piston, and by the inner surface of the cylinder; a communication passage for connecting the one end chamber and the other end chamber; and a valve chamber connecting to one axial end side of the communication passage. The valve chamber has provided therein a valve body for controlling the vertical movement of the piston mounted in a vertically movable manner. The valve body opens and closes the connection passage and has small diameter and length. A hydraulic oil pipe passage is obtained while the weight of the valve body is reduced.
Inventors:
MORITA YUUJI (JP)
TAN SEIICHIRO (JP)
TAN SEIICHIRO (JP)
Application Number:
PCT/JP2013/083841
Publication Date:
June 25, 2015
Filing Date:
December 18, 2013
Export Citation:
Assignee:
NIPPON PNEUMATIC MFG (JP)
International Classes:
B25D9/26; E21B1/26
Domestic Patent References:
| WO2012026571A1 | 2012-03-01 |
Foreign References:
| JPH0493185A | 1992-03-25 | |||
| JP2003159667A | 2003-06-03 | |||
| JPS612224A | 1986-01-08 | |||
| JP2003071744A | 2003-03-12 |
Other References:
See also references of EP 3085880A4
Attorney, Agent or Firm:
FUJIMOTO, NOBORU (JP)
Noboru Fujimoto (JP)
Noboru Fujimoto (JP)
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