Title:
圧力流体作動打撃装置
Document Type and Number:
Japanese Patent JP5009779
Kind Code:
B2
Abstract:
A pressure-fluid-operated percussion device includes a frame allowing a tool to be arranged movably in its longitudinal direction. Pressure liquid is fed to the percussion device and returned to a pressure liquid tank. A stress pulse is produced in the tool utilizing pressure of the pressure liquid. A pressure liquid source maintains pressure in the working pressure chamber. Pressure liquid is intermittently fed to the percussion device such that the pressure liquid pushes a transmission piston into a predetermined backward position. Pressure liquid is alternately discharged rapidly from the percussion device so that the pressure of the pressure liquid in the working pressure chamber and the pressure liquid flowing from the pressure liquid source pushes the transmission piston towards the tool, generating a stress pulse in the tool.
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Inventors:
Keskiniva, Maluk
Maki, Yoruma
Esco, Mauri
Ahora, Elkki
Hyelin, Aimo
Maki, Yoruma
Esco, Mauri
Ahora, Elkki
Hyelin, Aimo
Application Number:
JP2007500240A
Publication Date:
August 22, 2012
Filing Date:
February 22, 2005
Export Citation:
Assignee:
SANDVIK MINING AND CONSTRUCTION OY
International Classes:
B25D9/06; B25D9/12; B25D9/18; E21B1/02
Domestic Patent References:
| JP63044786U | ||||
| JP5185377A | ||||
| JP10034562A |
Foreign References:
| US0787960 | ||||
| US4688468 |
Attorney, Agent or Firm:
Takao Katori
Koichi Kushida
Koichi Kushida