| 摘要 |
A sport shoe having a plurality of pneumatically actuated, rotatable spikes that are mounted in open ended chambers formed in the shoe sole, each spike having a narrow tip. Each spike is constrained for movement between extended and retracted position. A stop is provided in each chamber for holding the spikes in their extended positions, the spike tips project outwardly from the chambers when in their extended positions. A pneumatically actuated bladder in each chamber when inflated, drives the spikes to their extended positions against the stops. Each spike is rotated beyond a vertical axis or centerline that is perpendicular to the axis of rotation of that spike. A spring operatively connected to each spike rotates the spikes to their retracted positions within the chambers when the bladders are deflated.
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