Patent ID: 8556757
Filing Date: 2013-10-15
Classification: B62M

Abstract:
1. A gear assembly, comprising: (a) a first drive cogwheel defining a first rotational axis; (b) a driven cogwheel defining a second rotational axis, parallel to and displaced from said first rotational axis, (c) a chain mounted about said first drive cogwheel and said driven cogwheel, linking said first drive cogwheel with said driven cogwheel, thereby defining a first gearing assembly, and a first gear; (d) a second drive cogwheel, co-axial to said first drive cogwheel, thereby forming a drive cogwheel set; (e) a rear wheel defining a third rotational axis, displaced from said first and said second rotational axis, and being operatively connected to and driven by said driven cogwheel; (f) a multi-step gear change assembly; (g) wherein a first movement of said multi-step gear change assembly results in a transition of said chain from said first drive cogwheel to said second drive cogwheel while remaining linked to said driven cogwheel, thereby defining a first gear change, a second gearing assembly and a second gear, wherein a second movement of said multi-step gear change assembly results in a return of said chain from said second drive cogwheel to said first drive cogwheel while remaining linked to said driven cogwheel, thereby defining a second gear change and a return to said first gear.