Blast hole drill pipe gripping mechanism
CA 2208865 C · Owner: Mock, Erwin · Inventors: Mock, Erwin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mechanism for loosening the threaded joint between members of a blast hole drill string includes a wrench to hold one of the members while the other member is gripped between one arm and a jaw pivotally mounted on the arm. A hydraulic cylinder advances one end of the arm to engage the member and another cylinder pivots the jaw to engage the member. The one end of the arm is then further advanced while the other end of the arm is retracted by a cylinder to apply a moment. The wrench has a pair of wrench arms that are pivotally attached at their rear to a support. Pawls are mounted on the wrench arms to engage slots in a drill pipe. A hydraulic cylinder is mounted between the wrench arms to …
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
- Filed June 26, 1997 and granted December 2, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 2019.
- 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.