Automatic derailleur shifter
CA 2084665 A1 · Owner: Mclaren, Michael J. · Inventors: Mclaren, Michael J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An automatic derailleur shifter system for example for a bicycle includes a hub (11) to which is attached a chain wheel (16) set and a derailleur system for moving the chain associated therewith from chain wheel to chain wheel for a gear changing system. Within the hub associated with the chain wheels is provided an automatic changing system including a member coupled to the chain wheel set which carries a helical screw (47) cooperating with the screw so that rotation of the screw relative to the sleeve (34) causes the sleeve to move axially. Axial movement of the sleeve is inhibited by a spring (78) and rotational movement of the sleeve is prevented by engagement with the hub. Thus …
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 10, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 2013.
- 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.