Boots – shoes – and leggings – Insoles – Laminated
Patent
1979-02-21
1980-09-16
Kee Chi, James
Boots, shoes, and leggings
Insoles
Laminated
36 3B, 36 76R, 36131, A43B 1341, A43B 706, A43B 514
Patent
active
042221820
ABSTRACT:
A shoe insole that will allow plantar flexion of the wearer's foot in an upward direction but will inhibit such flexion in a downward direction past a normal horizontal condition. The insole includes a rigid first member that extends from a toe end to a rear edge situated midway between the heel and toe of the wearer's foot. A flexible second member overlies the first rigid member and is hinged thereto at a transverse edge located between the toe and rear edge of the first plate. The second plate will flex upwardly in response to plantar flexion of the wearer's foot but will engage the first rigid member and resist further downward movement as the foot flexes downwardly beyond a normal horizontal extended condition. The members are positioned within the shoe by a sole-shaped pad.
REFERENCES:
patent: 350705 (1886-10-01), Strickland
patent: 905617 (1908-12-01), Wood
patent: 1870114 (1932-08-01), Heller
patent: 2049604 (1936-08-01), Cristallini
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