Earth boring bit with shear compression seal
CA 1253485 A · Owner: Hughes Tool Company · Inventors: Burr, Bruce H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An earth boring bit having a lubrication system that includes a pressure compensator and seals to confine lubricant within the bearings between rotatable cutters and shafts, the seals being of the asymmetrical shear/compression type, each half of which having a load deflection curve resulting from components satisfying the following criteria: DH > ApS, and, DC > ApS (S-1)/S1/2, Where: DH = Assembly deflection of shaft seal ring with bearing thrust faces in contact (in.);, DC = Assembly deflection of cutter seal ring with bearing thrust faces in contact (in.);, Ap = Axial cutter play (in.); S = Ratio seal to cutter movement. Also preferably DC ? DH(S-1)/S1/2
Read the whole patent
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 2, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 2, 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.