| 摘要 |
A displacement apparatus is provide for skating footwear such as in-line roller skates. The displacement apparatus has extension triggers, each of which is connected to respective rod members that releasably retain the rollers in a retracted position, and a retraction trigger connected to a slidable rod member that releasably retains the rollers in an extended position. Manual operation of the extension triggers and retraction trigger allows extension or retraction of the in line rollers as required. When retracted, the rollers are conveniently housed within a cavity in the underside of the shoe to thereby allow normal walking.
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