Global Patent Index - EP 0301287 A3

EP 0301287 A3 19901122 - BORING RAM

Title (en)

BORING RAM

Publication

EP 0301287 A3 19901122 (DE)

Application

EP 88110828 A 19880707

Priority

  • DE 3724619 A 19870725
  • DE 3735018 A 19871016

Abstract (en)

[origin: JPS6443694A] PURPOSE: To perform a given direction change through arbitrary regulation of a deviation of an impact tip and to prevent the occurrence of a deviation in a direction by a method wherein an impact tip is radially adjusted in a housing through two eccentric rings. CONSTITUTION: A ram boring machine 1 comprises an impact tip 4 formed as a stepped front head part 3 protruding from a housing 2, and a rod 5 supported through a spherical disc 13 by eccentric rings 11 and 12 rotatable in directions opposite to each other. When a deviation in a direction occurs to the tip 4, inflow of hydraulic fluid is effected by operating a pressure pipe system with a coupling joint for a feed coupled to the eccentric rings 11 and 12 through a hydraulic pipe system, the eccentric rings 11 and 12 are regulatable. Further, many pistons, preferably three regulation pistons, are rotatably disposed in a radial plane at the periphery of the nod 5.

IPC 1-7

E21B 7/06; E21B 7/26; E21B 4/14

IPC 8 full level

E21B 1/38 (2006.01); E21B 4/14 (2006.01); E21B 7/06 (2006.01); E21B 7/26 (2006.01)

CPC (source: EP US)

E21B 4/145 (2013.01 - EP US); E21B 7/068 (2013.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

BE CH FR GB IT LI NL

DOCDB simple family (publication)

EP 0301287 A2 19890201; EP 0301287 A3 19901122; EP 0301287 B1 19940119; DE 3735018 A1 19890427; DE 3735018 C2 19950216; EP 0558097 A1 19930901; EP 0558097 B1 19960605; JP 2871697 B2 19990317; JP S6443694 A 19890215; US 4938297 A 19900703

DOCDB simple family (application)

EP 88110828 A 19880707; DE 3735018 A 19871016; EP 93106712 A 19880707; JP 16864288 A 19880706; US 22328788 A 19880722