Title:
減衰装置及び該減衰装置を備える掘削機
Document Type and Number:
Japanese Patent JP4791552
Kind Code:
B2
Abstract:
A damping device for inserting into a housing of an impulse producing drill machine, for damping Shockwave reflexes from a drill string connected to the drilling machine, is distinguished in that a first damping piston (7) for direct or indirect action against the drill string and for applying a pressure in the direction of the drill string an a second damping piston (9) for applying pressure in the direction against the drill string against a fixed stop (11) arranged in the housing, wherein the first (7) and the second damping piston (9) are arranged to co-operate for joint damping action with a drill bushing or shank adapter in a certain relative position. The invention also concerns a drilling machine.
Inventors:
Larsson, Pell, Eric
Estlink, thomas
Estlink, thomas
Application Number:
JP2008547155A
Publication Date:
October 12, 2011
Filing Date:
December 06, 2006
Export Citation:
Assignee:
Atlas Copco Rock Drills Activolag
International Classes:
E21B1/00
Domestic Patent References:
| JP2006512217A | ||||
| JP2001341083A | ||||
| JP2262974A | ||||
| JP2000052278A | ||||
| JP2001334478A | ||||
| JP11033932A | ||||
| JP9109064A | ||||
| JP54111878U | ||||
| JP7173984A |
Foreign References:
| WO2004060617A1 |
Attorney, Agent or Firm:
Takao Hamano
Teruichi Hirai
Teruichi Hirai