Patent ID: 7530933
Filing Date: 2009-05-12
Classification: A63B

Abstract:
1. A resistance generating device for a training bicycle which has a support stand to suspend a bicycle wheel from a ground surface to permit rotation of the wheel relative thereto about a wheel axis by means of a pedaling action, comprising: a seat which is adapted to be mounted on the support stand adjacent to the bicycle wheel; a rotatable shaft which is mounted on and which is rotatable relative to said seat about a rotating axis parallel to the wheel axis; a friction wheel which is mounted on and which is rotatable with said rotatable shaft about the rotating axis, said friction wheel being adapted to frictionally engage the bicycle wheel so as to be rotated therewith; a first magnetically attractive member disposed to surround the rotating axis, a second magnetically attractive member which is mounted to be rotatable with said rotatable shaft at a higher or lower speed, and which is disposed to be spaced apart from said first magnetically attractive member along the rotating axis, said first and second magnetically attractive members being configured to be shiftable towards or away from each other along the rotating axis in response to the higher or lower speed of said second magnetically attractive member so as to increase or decrease a magnetically induced resistance force generated therebetween to be imparted to the bicycle wheel; a biasing member disposed to bias said first and second magnetically attractive members away from each other; and an actuating mechanism having a mount which is mounted on and is rotated with said rotatable shaft, and a thrusting member a fulcrum pivoted to said mount about a pivoting axis, the thrusting member includes a flung end and a pressing end at two opposite sides of said fulcrum such that said flung end is flung more outwardly by an increased centrifugal force resulting from the rotation of said rotatable shaft at the higher speed from a normal position to a thrusting position, and said pressing end is further turned about the pivoting axis, thereby pressing said second magnetically attractive member to move closer to said first magnetically attractive member against the biasing force of said biasing member so as to increase the magnetically induced resistance force.