Global Patent Index - EP 0921270 A4

EP 0921270 A4 2000-11-08 - UNDERGROUND AUGERING MACHINE BY ELECTRICAL CRUSHING, EXCAVATOR, AND ITS EXCAVATING METHOD

Title (en)

UNDERGROUND AUGERING MACHINE BY ELECTRICAL CRUSHING, EXCAVATOR, AND ITS EXCAVATING METHOD

Title (de)

MASCHINE ZUM UNTERGRUNDBOHREN DURCH ELEKTRISCH HERVORGERUFENE GESTEINSZERKLEINERUNGEN, GRABGERÄT SOWIE GRABVERFAHREN

Title (fr)

MACHINE SOUTERRAINE A TARIERE POUR CONCASSAGE ELECTRIQUE, EXCAVATRICE ET PROCEDE D'EXCAVATION

Publication

EP 0921270 A4 (EN)

Application

EP 97936846 A

Priority

  • JP 9702889 W
  • JP 24116396 A

Abstract (en)

[origin: WO9807960A1] An underground augering machine by electrical crushing provided with a mechanism which can surely hold a solution around electrodes for electrical crushing, an excavator, and its control method. The underground augering machine is provided with at least one pair of electrodes (1) for electrical crushing provided on the front face of the underground augering machine, a pulse generator (10) which applies a high-voltage pulse between the electrodes (1), a solution (9) filling up the spaces around the electrodes (1), a solution retaining cover (14) which retains the solution around the electrodes (1) between the front face of the machine and the ground and is provided on the outer peripheral surface of the machine, a solution feeding pipe (7) for feeding the solution to the peripheries of the electrodes (1), a pump (6) which supplies the solution to the front face of the machine through the pipe (7), and a storage tank (5) for storing the solution. Cases (19) may be provided around the electrodes (1) for retaining the solution around the electrodes between the front face of the excavator and the ground.

IPC 1-7 (main, further and additional classification)

E21C 37/18; E21D 9/08; E21D 9/10; E21B 7/15; E21C 35/20; E21D 9/00

IPC 8 full level (invention and additional information)

E21B 7/15 (2006.01); E21C 37/18 (2006.01); E21D 9/00 (2006.01); E21D 9/06 (2006.01); E21D 9/10 (2006.01)

CPC (invention and additional information)

E21B 7/15 (2013.01); E02F 5/18 (2013.01); E02F 5/305 (2013.01); E21B 7/001 (2013.01); E21C 37/18 (2013.01); E21D 9/00 (2013.01); E21D 9/06 (2013.01); E21D 9/10 (2013.01); E21D 9/1073 (2013.01)

Citation (search report)

  • No further relevant documents disclosed
  • See also references of WO 9807960A1

Designated contracting state (EPC)

DE

EPO simple patent family

WO 9807960 A1 19980226; EP 0921270 A1 19990609; EP 0921270 A4 20001108

INPADOC legal status


2001-06-27 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20001205

2000-11-08 [A4] SUPPLEMENTARY SEARCH REPORT

- Effective date: 20000925

2000-11-08 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A4

- Designated State(s): DE

2000-11-08 [RIC1] CLASSIFICATION (CORRECTION)

- Free text: 7E 21C 37/18 A, 7E 21D 9/08 B, 7E 21D 9/10 B, 7E 21B 7/15 B, 7E 21C 35/20 B, 7E 21D 9/00 B

1999-06-09 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19990319

1999-06-09 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE