Extendable spikes for shoes
作者： Gene A. Francello , Eric Nelson , Helen K. Park
DOI:
关键词:
摘要: Golf shoe sole 10 having extendable spikes 71 activated by compressed air from a pump 42 located inside of shoe. Pump is operated weight wearer's heel on bladder 41 in and check valves 51 maintain pressure pneumatic system. Pushbutton switch 58 selects movement between retracted extended modes.
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