Polylobe drive element
CA 1106647 A · Owner: California Pellet Mill Company · Inventors: Schnur, Andrew C.; Wilhelm, Donald M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A shaft drive element is disclosed. The device exhibits the characteristics of maximum engagement contact area uniform pressure throughout the contact area variability in, lockup and release characteristics as determined by the designer, minimum stress concentration in both the drive and driven element, economy of manufacture self-centering and, ease of assembly. The drive member has a cross section defined by six segments of a logarithmic spiral three, clockwise and three counterclockwise joined end to end. The female drive member having a cross section defined by six segments of the same spiral of slightly greater radius.
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 August 11, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 11, 1998.
- 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.