| 摘要 |
<p>The roller skate has at least three wheels (21,22,23) of equal dia. positioned on the same track and which are mounted on the underneath side of a plate (16), at the toe, instep and heel, along a centre plane. At least one of the wheels (22) can be adjusted as to its distance from the plane of the support plate (16), between the front and back wheels (21,23). The wheels are mounted on roller bearings and are screwed between the parallel side plates (28) of a U shaped bearing bracket (18) which is open at the bottom and which belongs to the rigid frame (12).</p> |
