Non-circular profile tunnelling machine with controlled eccentric secondary cutters
CA 1331025 C · Owner: Nippon Hyumukan Kabushiki Kaisha · Inventors: Ono, Chiyoaki; Takemura, Moriyuki; Iwasa, Seiji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A shield tunneling method of excavating a tunnel with an optional cross section by rotating a center cutter about an axis extending in the direction of propulsion and revolving a planetary cutter around the axis so as to excavate the region between the profile of excavation by the center cutter and the desired profile of excavation. A machine for practicing the method comprises a center cutter supported by the body of the machine so as to be rotatable about an axis extending in the direction of propulsion of the body a rotary body, rotatable about the same axis as the center cutter a, planetary cutter supported by the rotary body so as to be movable radially of the rotary body, and …
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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 July 26, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 26, 2011.
- 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.