Patent ID: 7959235

Claim:
An eccentric wheel apparatus for a rocking bicycle, comprising: a driving shaft (D); a rotating frame ( 110 ) of a cylindrical body ( 113 ) which includes an isolation plate ( 119 ) by which the inner portion thereof is isolated, an axial tube ( 115 ) to which the driving shaft (D) is fixed and is eccentrically formed via the isolation plate, a first spiral ( 116 ) which is formed on the outer circumferential portion of the cylindrical body ( 113 ), an extension portion ( 111 ) of a “C”-shaped cross-section which is formed at one end thereof, wherein ring-shaped grooves ( 117 ) are formed at the inner side thereof and a first unevenness portion ( 112 ) is formed at the outer side thereof; a ring-shaped wheel frame ( 120 ) which includes a ring-shaped outer circumferential portion ( 121 ) where connection units ( 129 ) each having a connection hole ( 128 ) are formed along the outer side thereof and where a circular plate (C) is rivet-connected with wheel rims (G), an opening space ( 124 ) formed in the inner side of the outer circumferential portion ( 121 ) thereof, a ring-shaped insertion support circumferential portion ( 126 ) and a ring-shaped groove portion ( 125 ) which are formed in the inner wall of the opening space ( 124 ), and a second unevenness portion ( 122 ) formed on the bottom of the groove portion ( 125 ) in correspondence to the first unevenness portion ( 112 ); and a circular adjustment member ( 130 ) of a cylindrical body ( 135 ) which is inserted from the other side of the wheel frame ( 120 ), including a corresponding second spiral ( 134 ) which is threadedly engaged with the rotating frame ( 110 ), and a circular extension portion ( 132 ) formed at the outer side of one end thereof, wherein the rotating frame ( 110 ) and the adjustment member ( 130 ) are eccentrically adjusted so as to be threadedly engaged with or separated from each other at the left and right sides of the opening space in the wheel frame ( 120 ).