Artificial foot

Claim 1

An artificial foot comprising: a. an inelastic core having a heel portion and a front portion extending the full width of the foot, b. the front of said heel portion and the rear of said front portion merging in a middle portion extending substantially the full height of said foot, c. said heel portion extending from said middle portion to the rear end of the foot, d. said heel portion having a top surface extending the length of said heel portion, e. said heel portion having a bottom surface inclined rearward from the bottom of said middle portion, and terminating at the rear of the foot, f. said front core portion having top and bottom surfaces converging to form a front rounded extremity spaced above and forwaRd of the ball of the foot, g. the bottom surface of said front core portion converging upward into said rounded extremity, h. a first elongated, flat, metal, leaf spring having a front end and a rear end, i. means securing the front end of said first leaf spring to the bottom of said middle core portion so that the rear end of said first spring projects rearwardly spaced below the bottom surface of said heel portion and terminates a short distance from the rear of the foot, j. a wedge-shaped resilient member substantially the width of the foot and secured between the bottom surface of said heel portion and said first leaf spring and terminating at the rear of the foot, k. a second elongated, flat, metal, leaf spring having a front end and a rear end, and of sufficient strength and elasticity to flex a predetermined distance under the weight of the wearer of the foot when walking, and to be restored to its original position when the weight is relieved, l. securing means fixing the rear end of said second leaf spring flush against the bottom surface of said middle core portion and adjacent and in line with the front end of said first leaf spring, so that said second leaf spring projects forward below the bottom surface of the front portion, and the front end of said second spring is spaced forward of said front extremity, m. a soft, resilient pad mounted on top of said second leaf spring, spanning the width of the foot, and extending from a point slightly forward of the rear end of said second leaf spring forward substantially beyond said front extremity, n. a flexible webbing member mounted upon said resilient pad, said webbing member having a rear end portion fixed to the bottom surface of said front core portion, and being substantially coextensive in width and length with said pad, o. an upper foot portion of resilient material substantially harder than said pad and occupying the space in front of said rounded extremity, and the space between said front core portion and the top of said webbing member, p. a sole member of resilient material of the same hardness as said upper foot portion covering the bottoms of said leaf springs and secured to said upper foot portion, and q. a vertical bore extending through said heel portion, said wedge member, said first leaf spring and said sole member to receive an elongated securing means for securing the foot to a prosthetic ankle segment.