Title (en)

BORING RAM

Publication

EP 0377153 A3 19910116 (DE)

Application

EP 89123180 A 19891214

Priority

DE 3900122 A 19890104

Abstract (en)

[origin: EP0377153A2] In a self-driven boring ram (1) with a tubular housing (2), a percussion tip (5) and a transmitter (9; 11) for monitoring the running direction, the directional stability can be improved in a simple manner by the boring ram being provided with a transmitter (9; 11) arranged at the front as far as possible in the driving direction (7). <IMAGE>

IPC 1-7

E21B 7/26; E21B 47/022; E21B 47/12; E21B 7/06

IPC 8 full level

E21B 11/02 (2006.01); E21B 7/06 (2006.01); E21B 7/26 (2006.01); E21B 47/022 (2012.01); E21B 47/12 (2012.01); F16L 1/024 (2006.01)

CPC (source: EP US)

E21B 4/145 (2013.01 - EP); E21B 7/068 (2013.01 - EP); E21B 7/267 (2020.05 - EP US); E21B 47/0232 (2020.05 - EP); E21B 47/13 (2020.05 - EP)

Citation (search report)

• [X] US 3529682 A 19700922 - COYNE JAMES C, et al
• [Y] FR 2336520 A1 19770722 - SCHMIDT PAUL [DE]
• [Y] US 3746106 A 19730717 - MC CULLOUGH L, et al
• [A] DE 2157259 B1 19721109 - TRACTO TECHNIK [DE]
• [E] EP 0361805 A1 19900404 - GAS RES INST [US]
• [A] DE 2847128 A1 19800514 - TRACTO TECHNIK
• [A] EP 0262882 A2 19880406 - FLOWMOLE CORP [US]
• [A] US 4646277 A 19870224 - BRIDGES JACK E [US], et al
• [A] DE 8804347 U1 19880601

Designated contracting state (EPC)

BE CH FR GB IT LI NL

DOCDB simple family (publication)

EP 0377153 A2 19900711; EP 0377153 A3 19910116; EP 0377153 B1 19941214; DE 3900122 A1 19900705; DE 3900122 C2 19901108; DE 3900122 C3 19940224; JP 2707518 B2 19980128; JP H02213585 A 19900824

DOCDB simple family (application)

EP 89123180 A 19891214; DE 3900122 A 19890104; JP 33616989 A 19891225