Flexible shaft drill bit with removable cutting head
CA 2313749 A1 · Owner: Bergman, William · Inventors: Bergman, William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention features a self-feeding wood-, boring drill bit. A two-piece bit has a threaded pilot point as part of the shaft. The cutting head has an axial through-bore which is threaded to receive the pilot point so the two parts are held together in threaded engagement. An extended bearing surface area or bearing neck is also provided between the cutting head and the shaft in addition, to the threaded joint area. This structure spreads the forces over a large bearing surface, which greatly reduces the opportunity for shaft failure. Two different materials are used for the head and shaft, respectively so that the, head has optimum cutting capabilities and the shaft has optimum …
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 July 12, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 12, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 12, 2022.
- 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.