Patent ID: 9216793
Filing Date: 2015-12-22
Classification: B62L,B62M,F16H

Abstract:
1. A bicycle single-acted gear shifting device ( 12 ) for a chain transmission system that incorporates a multiplicity of chainrings or sprockets in order to obtain different gear ratios, comprising: a front ( a main spring ( a secondary spring ( a single-acted ratchet-indexing mechanism ( and one only single-acting slave connector ( characterized in that said only one single-acting slave-connector ( 110 ) comprises a hydraulic slave-cylinder ( 111 ) and a hydraulic slave-piston ( 112 ) either mechanically coupled or integrally performed in a same element with the acting member ( 5 ) wherein said single-acting slave-connector ( 110 ), operated by hydraulic means, moves the acting member ( 5 ) in the abovementioned forward direction due to fluid pressure.