Title:
【発明の名称】衝撃機械装置
Document Type and Number:
Japanese Patent JP2870943
Kind Code:
B2
Abstract:
The device comprises a set of rods comprising a number of rods (6) which are journalled in a surrounding set of tubes (7) by means of elastic bushings (52,53). One of the bushings is provided with a lip (54) which sealingly rests against the rod (6) when flushing medium is not supplied to the space between the set of rods and the set of tubes but allows passage of flushing medium at drilling.
Inventors:
KURUTO HORUJAA ANDERUSON
Application Number:
JP5388590A
Publication Date:
March 17, 1999
Filing Date:
March 07, 1990
Export Citation:
Assignee:
ATORASU KOPUKO KONSUTORAKUSHON ANDO MAININGU TEKUNIIKU AB
International Classes:
E21B3/00; E21B6/02; E21B7/20; E21B17/00; E21B21/00; E21B4/02; E21B21/10; (IPC1-7): E21C1/12; E21B6/00; E21B17/00; E21B21/10; E21C7/08
Domestic Patent References:
| JP56150291A |
Other References:
【文献】米国特許3401758(US,A)
【文献】欧州公開197019(EP,A1)
【文献】欧州公開197019(EP,A1)
Attorney, Agent or Firm:
Shigeru Yagita (3 outside)