Control system for a working apparatus for use on a bicycle

A control system operable by a pulling force and a restoring force for controlling a speed change apparatus of a bicycle, said control system being of the type which makes use of a driving rotation of a driving member rotating about a fixed shaft in response to a rotation of a sprocket, said control system comprising:

• a first shift member rotatable about said fixed shaft in one direction by said pulling force, and in the other direction by said restoring force;
• a second shift member for transmitting a rotation of said first shift member to a controlled member of said speed change apparatus by rotating about said fixed shaft in response to a rotation of said first shift member to control said controlled member, said first shift member and said second shift member being interlocked to be shiftable relative to each other;
• clutch means switchable between a first position to transmit rotational drive of said bicycle as a restoring force to said second shift member thereby rotating said second shift member, and a second position to break drive transmission, said clutch means having a contact portion for contacting said drive member, said contact portion contacting said drive member only when said clutch means is in said first position,
• clutch control means for switching said clutch means to said first position in response to a relative shift between said first shift member and said second shift member.