发明授权
US4541643A Two wheel skating device 失效
两轮滑冰装置

Two wheel skating device
摘要:
The two wheel skating device of the present invention contains two large size wheels with each over four inches in diameter. The wheels are symmetrically arranged on opposite sides of a frame which accommodates a skater's shoe. The wheels are rotationally mounted on axles coaxially extending from opposite sides of a swinging arm which is pivotally connected to the frame. Each wheel is rotationally mounted through a wheel assembly including unidirectional needle bearings for rotation in only one direction.
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