Seal device between fastening bolt and bolthole in gas turbine disc
CA 2246856 C · Owner: Mitsubishi Heavy Industries, Ltd. · Inventors: Hirokawa, Kazuharu; Chikami, Rintaro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Seal device between fastening bolt and bolthole in gas turbine disc reduces cooling steam leaking from gap between the fastening bolt and the bolthole. In the gas turbine disc 31 carrying moving blades fastening bolt 33 for, fixing the disc 31 passes through in the bolthole 32. On low pressure side of the disc 31, bolthole diameter enlarged portion 39 having larger diameter than that d2 of the bolthole 32 is provided. Fastening bolt 33 is provided with shaft diameter enlarged portion 33a. Seal piece 1 is fitted at its one end around the shaft diameter enlarged portion 33a and is engaged at the other end with stepped portion of the bolthole diameter enlarged portion 39. In operation of gas …
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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
- Filed September 11, 1998 and granted February 12, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 11, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 11, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.