Drive shear device for rotary cutter unit
CA 2189786 C · Owner: Walters, James C. · Inventors: Walters, James C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Each knife-carrying disk of a rotary cutterbar has a hub connected to a drive shaft through means of a shear device. In a first embodiment of the invention the, shear device is in the form of either a collar or a clamping member having internal splines received on a splined upper end of the drive shaft and having shearable cylindrical drive lugs engaged with complementary shaped openings provided in anupper surface of the disk hub. In another embodiment of the invention the sheardevice is in the form of a ring-like shear insert having shearable inner splinesreceived on the splined upper end of the drive shaft and having outer splines engaged with a splined mounting hole of the disk hub.
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 November 6, 1996 and granted November 2, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 6, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 2018.
- 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.