Patent ID: 8308124

Claim:
A bicycle seat adjustment device comprising: an outer tube ( 10 ) having a top end ( 11 ) and a bottom end ( 12 ); an inner tube ( 20 ) inserted into the outer tube ( 10 ) via the top end ( 11 ) of the outer tube ( 10 ), the inner tube ( 20 ) having a piston seat ( 21 ) and a clamp unit ( 22 ) on two ends thereof; a valve unit ( 30 ) extending through the piston seat ( 21 ) and located in the inner tube ( 20 ), the valve unit ( 30 ) comprising a rod ( 31 ) extending through the piston seat ( 21 ) and reaching the bottom end ( 12 ), the rod displaceably engaging to alternatively seal and unseal a flow path through the piston seat ( 21 ), and a control assembly ( 40 ) having a control unit ( 41 ) connected to the bottom end ( 12 ) of the outer tube ( 10 ) and an action unit ( 42 ) located outside of the outer tube ( 10 ), the control unit ( 41 ) having a push member ( 411 ) engaging the rod ( 31 ) to move the rod ( 31 ) linearly, the action unit ( 42 ) remotely controlling the push member by a cable ( 421 ) extending along a sidewall of the outer tube ( 10 ) to the bottom end thereof, a distal end of the cable ( 421 ) connected to a switch ( 422 ), the push member ( 411 ) being remotely actuated responsive to the switch to move the rod ( 31 ) for selectively controlling the flow path through the piston seat ( 21 ) to alternatively release and lock the bicycle seat in adjusted position.