Variable speed transmission
CA 2013645 C · Owner: Robert, Jean · Inventors: Robert, Jean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a variable speed transmission of the pulley type, one of the pulley cheeks is movable axially with respect to the other which is stationary. The movable cheek faces a reaction cup which is solid with the stationary cheek. The cup and the movable cheek are formed with converging cam surfaces which define between them a chamber into which are disposed centrifugal weights having ends sliding on the cam surfaces. When the pulley and reaction cup rotate, the weights are thrown outward and force the movable cheek toward the stationary one. According to the invention the cam surface of the reaction, cup is concave having a radius of curvature of predetermined length. On the other hand, the …
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 April 2, 1990 and granted September 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 2012.
- 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.