Retractable stud

Details Retractable stud Retractable stud

1997-09-16

1998-04-21

Kavanaugh, Ted

Boots, shoes, and leggings

Antislipping devices

Disengaging

36 29, A43C 1500

Patent

active

057406197

ABSTRACT:
A retractable stud for a footgear sole carried by a movable backing plate having a underlying air inflatable and air deflatable bladder with means for air inflation and air deflation which in turn has an underlying footgear outer sole having a bottom outer surface defining an opening for passage of the retractable stud, the bladder in an air inflated configuration moving the backing plate inboard thus holding the stud against the weight of the wearer of the sole in a retracted position entirely within the bottom outer surface of the outer sole, the bladder in an air exhausted deflated configuration allowing the weight of the wearer of the sole to move the backing plate outboard thus holding the stud in a protruding position beyond the bottom outer surface of the outer sole.

REFERENCES:
patent: 4873774 (1989-10-01), Lafever
patent: 5299369 (1994-04-01), Goldman
patent: 5526589 (1996-06-01), Jordan

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