Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
March 20, 2018
Patent Application Number
14215213
Date Filed
March 17, 2014
Patent Citations Received
Patent Primary Examiner
Patent abstract
Embodiments of a front derailleur gear shifting system including various unique chain guides attached to and operating from a single pivot point. This derailleur system provides a simple, yet, elegant and robust improvement in shifting technique over conventional, lateral motion front derailleurs. Embodiments of open and closed annulus chain guides having specially shaped lifting and pulling surfaces for acting upon a bicycle chain during shifting are also disclosed. Additionally, as an optional enhancement, a dual-sided chain catcher that prevents unintended over-shifts in either direction is disclosed.
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