Boots – shoes – and leggings – Boots and shoes – Overshoes
Patent
1980-06-23
1981-12-01
Lawson, Patrick D.
Boots, shoes, and leggings
Boots and shoes
Overshoes
A43B 310
Patent
active
043028918
ABSTRACT:
Improvement in a jumping shoe attachment having a sole plate and an arrangement for attaching the sole plate to a user's shoe, the improvement comprising an arrangement including a ground operative hinge device disposed beneath the sole plate for yieldably holding the jumping shoe attachment against the user's weight in an elevated position above the ground, the hinge device comprising a pair of hinge plates hinged about a pair of stationary hinge axes affixed to the sole plate, the hinge axes being both centered and spaced apart lengthwise in respect to the sole plate, the lower ends of the hinge plates being operative against the ground, the hinge device including a plurality of tension springs for predetermining the amount of force by which a pair of the jumping shoe attachments overcomes the user's weight, the tension springs being connected to the inside walls of the hinge plates for yieldably pulling them together during use of the jumping shoe attachment, the tension springs being preselectable as to number and type to accommodate the user's weight, an elastomeric block affixed to the bottom of the sole plate between the hinge axes, and a pair of yieldable members for limiting the amount by which the hinge plates can be spread apart, the pair of yieldable members being disposed between the bottom of the sole plate and the outside walls of the hinge plates, respectively.
REFERENCES:
patent: 898084 (1908-09-01), Backermann
patent: 3205596 (1965-09-01), Hoffmeister
patent: 3951422 (1976-04-01), Hornsby
Fisher William L.
Lawson Patrick D.
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