Friction bearing and cone retention thrust system for a rock bit
CA 2044070 A1 · Owner: Vezirian, Edward · Inventors: Vezirian, Edward; Vezirian, Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rotary rock cutter cone is rotatively supported while being axially located and retained on a cooperating cantilevered journal shaft depending from a rock bit body by plain friction bearing means. A primary stationary thrust face is provided by a radially extending surface of the journal shaft adjacent the distal end of the journal shaft. An annular ring, fitted about the journal shaft forms a gland, for housing a grease seal which impinges upon the journal shaft. A radially extending distal surface of the annular ring runs in cooperation with a radially extending stationary thrust face Formed by a secondary thrust member. The secondary thrust member is axially secured to the journal …
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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 June 7, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 7, 2013.
- 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.