Bearing system for a roller cone rock bit
CA 1254552 A · Owner: Megadiamond Industries, Inc. · Inventors: Hall, David R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A roller cone rock bit is disclosed with an improved bearing system. The improvement comprises a journal bearing which is substantially frusto-conically shaped and a roller cone bearing which is reverse shaped to mate with the journal bearing. The invention also includes a means for maintaining the journal and roller cone bearing in compression against each other. In the preferred embodiment the journal and roller, cone bearings comprise polycrystalline diamond and the compression is maintained by a threaded bolt which is tightened to the point of putting the bolt in tension. In one preferred embodiment the bolt is threaded into, the cone and rotates in the center of the journal. In another …
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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 May 23, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 23, 2006.
- 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.