Title:
【発明の名称】ドリルヘッド
Document Type and Number:
Japanese Patent JP2993521
Kind Code:
B2
Abstract:
A drilling head for tunnel boring has a channel (10) along its axis which can revolve about it and has a forward directed nozzle. There is also a rear directed nozzle (4) whose channel (41) connects with the central channel (10). - Alternatively there are three rear directed nozzles (4) at the same angle of fifteen degrees with respect to the central channel (10). It can also have three forward directed nozzles (2), two of which are at an angle of forty five degrees to the third central nozzle (2).
Inventors:
DAAN RORUFU
Application Number:
JP50680291A
Publication Date:
December 20, 1999
Filing Date:
March 25, 1991
Export Citation:
Assignee:
KEE ESU KEE GAIDETSUDO MAIKUROTONERINGU TEKUNOROJIIZU SUPETSUIARUTEIIFUBAUGEREETO GMBH UNTO CO KG
International Classes:
E21B7/06; E21B7/18; E21B10/60; E21D9/10; E21C45/00; (IPC1-7): E21B7/18; E21B10/60
Domestic Patent References:
| JP4932406A |
Other References:
【文献】米国特許3269471(US,A)
Attorney, Agent or Firm:
Tsutomu Toyama (3 others)