Shield tunneling machine with eccentricity accommodating seal structure
CA 1324619 C · Owner: Kabushiki Kaisha Iseki Kaihatsu Koki · Inventors: Akesaka, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shield tunneling machine comprises a shield body, a rotor disposed in a front portion of the shield body, support means provided behind the rotor in the shield body and for supporting the rotor to be eccentrically movable around the center axis of the shield body, drive means for moving the rotor eccentrically and seal means disposed between the support means and the rotor. The seal means is provided with an annular recess provided around the center axis in a portion where one of the support means and rotor faces the other and opened to the other of the support means and rotor, a ring disposed in the recess to be movable in the direction of the center axis and having a generally constant …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted November 23, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 23, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.