Deck-mounted shaft bushing for the drill string of a blast hole drill
CA 1073895 A · Owner: Bj-Hughes Inc. · Inventors: Work, John T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A guide bushing mountable in a supporting sleeve in the deck of a blast hole drill for guiding a drill string extending through the sleeve, the bushing having a tubular core providing a cylindrical axial bore adapted to receive and guide the drill string, means such as a flange for mounting the core in the supporting sleeve and resilient, elastomeric cushion means mounted on the exterior of the core means and adapted to cushion transverse movements of the bushing. Preferably, the bushing is formed of two halve fastened together by hinges, so that it can be opened and laterally installed around the drill string.
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 March 18, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 18, 1997.
- 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.