发明授权
US5997449A Structure of a hula-hoop 失效
呼啦圈的结构

Structure of a hula-hoop
摘要:
A hula-hoop includes a body having a hollow portion at an inner side thereof, and a plurality of rollers equi-distantly spaced apart and pivotally mounted in the hollow portion of the hula-hoop body. The rollers are covered by a soft outer sleeve and each roller projects slightly from the inner side of the hula-hoop body. When the user turns the hula-hoop at the waist portion, the rollers may enhance the turning of the hula-hoop, and may prevent possible injury to the waist portion. The hula-hoop is easy to dismantle and assemble to facilitate carrying. Additionally, the rollers may massage the waist of the user during play.
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