They Invented What? (No. 201)
U.S. Pat. No. 4,599,071: Adjustable beach-shoes.
1. An adjustable beach-shoe, comprising:
a platform with four straps adjustable in length secured thereon, including a peripheral wall projecting downwards with a recess defined thereby, having a front end and a rear end provided with a first cut-out and a second cut-out with similar shapes respectively, and two sides of said peripheral wall being provided with inward guiding grooves, a spring member mounted in said recess at the end thereof near the rear end of the platform, the spring member providing a biasing force in a direction toward said front end, and a plurality of projections provided with respect to said front end;
a web member including a tubular portion having two ends, a pair of spring-loaded pins mounted on said two ends respectively, a metal plate secured longitudinally to the tubular portion and having an upper surface and a lower surface, a pair of packing pieces attached to said upper surface and said lower surface of said metal plate respectively, a plurality of elastic threads secured to said tubular portion and extended in a direction opposite to said metal plate, a plastic membrane extended over a surface including said elastic threads, said web member being movable forwards and backwards within said recess with the sliding of said spring-loaded pins along said inside guiding grooves when said web member is mounted in said recess;
a sole member mounted on said platform to cover said recess; and
a guard piece contoured complementarily with each of said first and second cut-outs and provided with slits for engaging with said projections of said platform, the guard piece for the first cut-out being adapted to fit in said first cut-out when said web member is entirely received in said recess to provide a beach-shoe.
2. An adjustable beach-shoe as claimed in claim 1, wherein a spring member is provided in said recess at the end thereof near the rear end of the platform, the spring member biasing said web member when received therein, so that when said guard piece is removed from first cut-out, said web member is biased to slightly protrude outwardly from said first cut-out, wherein there is further provided a pair of bores respectively formed on said two sides of said peripheral wall near said front end for receiving said spring-loaded pins when said web member is pulled out of said recess by a predetermined distance where said spring-loaded pins are aligned with said bores, with the cooperation of said pair of packing pieces, said metal plate of said web member being held firmly in said front end of said platform.