US 1198399 A
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Description (OCR text may contain errors)
E. W. BABCOCK.
APPLICATION man JAM. 24, |915.
Patented Sept. 12, 1916.
@14mm/vbo@ E'. Iii/ Baba@ ck UNITED STATES PATENT OFFICE.
ELISHA w. BABcocK, or LORAIN, omo, AssIGNoR or ONE-HALF rro JOHN n. KITCHEN, or LORAIN, OHIO.
Specification of Letters latent.
Patented Sept. 12, 1916.
Application filed J' anuary 24, 1916. Serial No. 73,961.
To all whom t may concern:
Be it known that I, ELisi-ra WV. Raccoon, a citizen of the United States, residing at Lorain, in the county of Lorain and State of Ohio, have invented certain new and useful Improvements in Artificial Legs, of which the following is a specification.
This invention relates to artificial limbs, and more particularly to the construction of the foot.
The principal object of the invention is to provide an artificial foot of simple and practical construction, which will allow an easy smooth ankle-joint and also toe movement, and therefore be comfortable for the wearer. The foot consists of an inner member forming the lower portion of the leg, which inner member is inclosed by an outer member pivoted to the forward end thereof while its rear portion is resiliently supported; and a toe piece is resiliently connected to said inner and outer members.
Another object of the invention is to so design the foot that, the resiliency of the ankle-joint may be quickly set or changed to most suitably support the weight of the wearer.
lith the above and other objects in view as will be readily understood, the invention will be hereinafter fully described in connection with the accompanying drawings, which simply illustrate the same, and the novel features thereof will be distinctly pointed out in the appended claims.
In the drawings like characters of reference indicate corresponding parts.
Figure l is a sectional view of an artificial foot constructed in accordance with my invention. Fig. 2 is a sectional plan view taken on line 2 2 of Fig. 1, and Fig. 3 is a cross sectional View taken on line 8-" of Fig. 1.
Referring to the drawings, 1 represents I the lower portion of a leg, which may be attached to a wearer in any suitable manner. This leg is preferably constructed of aluminum, is hollow, and formed integral therewith is a foot member 2. The forward portion 3 of the foot member is solid, while the rear portion is hollowed out, as shown at 4l. Said foot member fits within a hollow foot member 5, which consists of a heel portion 6 and a rounding forward end 7. The forward end of the inner foot member 2 is bifurcated, as at S, and the rounding end 7 of the outer foot member 5 is provided with a slot 9 opposite the same, for receiving a lug 10 of a toe-piece 11. A pin 12, passing through the thickened walls 13 of the outer foot member, through the sides 14 of the inner foot member' and through the lug 10 of the toe-piece, secures these parts together and also serves as a pivot to permit movement of said foot members and said toe-piece. It will be observed that said toepiece is cut out at each side of its lug 10, as indicated at 15, to correspond with the rounding end 7 of the foot 5, which gives a closed joint at this point for full action of the foot. The toe-piece 11 is held in normal position by means of a suitable flat spring 1G, which engages the bottom of the outer foot member 5 and the bottom of a recess 17 in the toe-piece.
The weight of the wearer is resiliently supported upon a suitable coiled spring 18, which is arranged in the rear hollowed out portion et of the inner foot member=2, and is interposed between the heel 6 of the outer foot member 5 and a bar 19 extending from the forward to the rear wall of the leg. In order to provide convenient means for placing said coiled spring in position, and also to provide means for readily adjusting the tension thereof to suit the weight of the wearer, the following construction is employed. The heel of the outer foot member is provided with an opening 20, from which projects an internally threaded boss 21 for receiving a tubular plug 22. Said coiled spring rests within this tubular plug, and its upper end is held in alinement therewith by means of a centering boss 23 depending from the before mentioned bar 19. Said tubulaiplug is screwed into or out of the internally threaded boss 21 by the use of any suitable tool which may be inserted in the holes 24. The inclination and upward movement of the inner foot member 2 with relation to the outer foot member 5 is controlled by means of a set screw 25, which is suitably arranged in said inner foot member and is adapted to engage the upper wall of the outer foot member. It will be noted that the tension of the coiled spring 18 may be increased or diminished by turning said set screw, and for convenience, an aperture 26 is provided in the bottom of the outer foot member to receive a screw driver for turning the same. The rear part of the outer foot member 5 is cut down at 27 to allow clearance for the action of the inner foot member 2, and a suitable protecting shield 28 is provided at the opening of the outer foot member.
From the above description and the accompanying drawings, it will be obvious that an artificial leg constructed in this manner will give the wearer an easy, smooth and comfortable walking action very much similar to that of the natural limb. Also that the elasticity of the movement may be conveniently and quickly altered to meet the desires of the wearer.
It will be understood that slight changes in the formand arrangement of the parts may be made so long as they are within the scope of the claims.
Having fully described my invention, what I claim is:
l. In an artificial limb, the combination with a leg portion having an inner foot member, of' an outer foot member, the inner foot member having one end pivotally connected to the forward end of the outer foot member, and means for resiliently supporting the other end of the inner foot member from the outer foot member, substantially as described.
2. In an artificial limb, the combination with a leg portion having an inner foot member, of' an outer foot member, the inner foot member having one end pivotally connected to the outer foot member', a spring interposed between the outer foot member and the free end of the inner foot member, and means for changing the tension of the spring, substantially as described.
3. In an artificial limb, the combination with a leg portion having an inner foot member, of an outer foot member, the inner foot member having one end pivotally connected to the outer foot member, a spring interposed between the outer foot member and the free end of the inner foot member,
and adjustable means for controlling the relative upward movement of the inner foot member to the outer foot member, subi-l stantially as described.
1I. In an artificial limb, the combinationl member, of an outer foot member, a toe piece, a pin pivotally connecting the inner foot member, the outer foot member and the toe piece, a spring for keeping the toe piece in normal position, and means for resiliently supporting the free end of the inner foot member from the outer foot member, substantially as described.
G. In an artiiicial limb, the combination with a leg portion having an inner foot member, of a. hollow outer foot member, the inner foot member arranged in the outer foot member and having its forward end pivotally connected thereto, the rear portion` of said outer foot member being provided with an opening, a hollow boss projecting from the opening, the opening and the hollow boss being threaded, a tubular plug screwed into said threaded opening and boss, and a coiled spring resting in said tubular plug and resiliently Vsupporting said inner foot member, substantially as described.
In testimony whereof I afiix my signature.
ELISIIA IV. BABCOCK.
Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. C.