US453285A

US453285A - Artificial leg

Info

Publication number: US453285A
Authority: US
Priority date: 1891-03-23
Filing date: 1891-03-23
Publication date: 1891-06-02
Anticipated expiration: 1908-06-02

Description

(No Model.)

' J. B. KREIDBR..

ARTIFICIAL LEGl Patented June 2, 1891.

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UNITED STATES PATENT OEEICE.

JACOB B. KBEIDER, OF ANNVILLE, PENNSYLVANIA.

ARTIFICIAL LEG.

SPECIFICATION' forming part of Letters Patent No. 453,285, dated June 2, 1891.

Application tiled March ZLS, 1891.

To all whom, it may concern:

Beit known that I, JACOB B. KREIDER, a

citizen of the United- States, residing at Annville, in the county of Lebanon and State of Pennsylvania, have invented certain new and useful Improvements in Artificial Legs; and I do hereby declare the following to be a full, clear, and exact description of the-invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to articia-I legs, and has for its object certain improvements in construction, which will be hereinafter described, and particularly pointed out in the claims. Y

In the accompanying drawings, which form part of this specification, Figure l represents a perspective view of my invention; Fig. 2, a vertical section; Fig. 3, a similar View of the stirrup; Fig. 4, a vertical section of the joint between the upper and lower sections; Figs. 5, 6, '7, and 8, detail perspectives of the several members forming said joint.

. Reference being had to the drawings andthe letters thereon, A indicates the upper socket to embrace the thigh of the wearer, and is provided with an overlapping fold, hooks a a on both sides of the fold, and alacing to adjust the socket to the leg. The hooks a are provided with two Shanks b b for securing the hook to the leather socket by rivets c to resist the strain brought to bear upon the hooks and prevent them being torn off, as frequently occurs with hooks attached by an eyelet or with a single shank.' To the sides of the socket A are secured bars CZ d, which, together with the socket, form the upper section of the artificial leg. The bars d are provided at their lower ends with a head having tubular conical projections c e on both sides thereof, seats f f, also on both sides of the bar, and a shoulder g, which forms part of the joint B between the upper and lower sections of the leg. v

C indicates the lower section of the artificial leg, which consists of a skeleton frame composed of bars or rods h t' lol, connect-ed at their upper ends to a ring or band D and at their lower ends to a band E. The side 'to form brace-rods m m, and to said bars h 7c Serial No. 386,084. (No model.)

are detachably secured the lower ends of the bars n n by screw-bolts 0, and near the upper ends said bars are detachably secured to the ring or band D by screw-bolts p p. The bars n n are provided with annular conical cavities or seats q, which correspond with the conical projections c e on one side of the bars d, and in said cavities are conical projections r, which engage wit-h the oppositely-tapercd conical seats s in the projections e e, and form an oil-chambert between the ends of the projections o" and w, as shown in Fig. 4. The chamber t is supplied with oil through an aperture u in the head on the bar d.

E indicates an adjustable cap or plate provided with an annular conical cavity c and a conical projection yw, which are like the cavity q and projection r on the end of the bar n, and fit over and in the projection c and seat s on the opposite side of the bar d. In the wall of each annular cavity are formed shoulders a b', which engage with the bar d and limit themovement of the joint rearward to an angle of about forty-live degrees, the forward movement being further limited by the two-,part strap c', secured to the upper and lower sections of the leg. The wall of the cavity at d forms a wearing-surface which engages with the seats f on the bar d. The cap or plate E is also provided with lugs e e', which engage with slots f f in the bar 'n to prevent lateral movement of the cap, and the cap is secured to and adjusted upon the bar n by screws g g, which complete the j ointby holding the several parts together and take up the wear of the joint B. The space between the bar n and the inside of the arm 71. of the cap is filled with thin washers f"which surround the screw g', and are removed separately one at a time as the joint becomes loose and requires taking up. Then the joint B becomes worn out, it can be read- TOC free circulation of air around the end of the stump to prevent chafine.

G indicates the ankle-section, around the upper end of which the band E is attached, and is secured to the fraaie by a bolt 7n', passing through the extensions Z Z of the bars 7L k and the ankle-section, and to the anklesection is attached the foot 1I by a'stirrup I, secured to the ends of the bars Z Z by a transverse steel bolt m', which passes through a brass tube n', forming a journal for the foot to swing upon. 'lhe tube a is detachably secured in the stirrup, so that it can be readily rcmoved when worn out.

The stirrup embraces the foot to prevent splitting of the same, and is secured thereto by a bolt o', and the Wear of the journal formed by 'the bolt mf and tube n is taken up by the spring p and rod q. The spring p is seated in a cavity r in the ankle-section, and the rod q is provided with a head s', which rests upon the upper end of said spring, while the lower end of the rod passes through a slot t in the foot, terminates in a hook u', and engages with a pin o', crossing said slot in a Vcavity @c in the under side of the foot. In the heel of the foot is a socket w', in which rests the rounded head a of a pin b, which enters a spiral spring c in a cavity d in the ankle-section. The spring c forms a cushion between the ankle-section and the foot, and, in conjunction with the spring p', restores the foot to its normal position after each displacement produced by the act of stepping` and the motion of the body. The foot is further held in proper relation to the ankle-section'by the rounded front and rear extensions d e of the ankle, which engage with corresponding parts f lt of the foot.

By the construction shown a neat, light, and durable artificial leg is produced and is free from any objectionable noise produced in the act of walking.

Having thus fully described my invention, what I claim isl. In an artificial leg, the knee-joint bar secured in the usual way to the upper socket and to the leg part by a short removable bar attached to the bifurcated framc-bar.

2. In an artificial leg, the joint herein described, consisting of a bar having a head provided with conical projections on both sides and an oppositelytapered aperture through said head and projections, and abar having a conical annular cavity and a conical projection in said cavity, in combination with an adjustable cap or plate provided with a conical annular cavity and a conical proj ection in said cavity.

3. In an artificial leg, the joint herein described, consisting ot a bar having a head provided with a conical projection on both sides and an oppositelytapered aperture through said head and projection, and a bar having a conical annular cavity anda conical projection in said cavity,in combination with an adjustable plate provided with a conical cavity and a conical projection in said cavity, and removable washers supported upon an adj ustin gscrew.

l. In an artificial leg, the adjustable joint herein described, consisting of conical projections and cavities, a detachable plate, Washers supported upon an adj listing-screw, and an oil-chamber within the joint.

5. In an artificial leg, the joint herein described, consisting of a bar having a head provided-with conical projections, seats on both sides of the bar, an oppositely-tapered aperture through said head and projections, a bar having a conical annular cavity and a conical projection in said cavity, and shoulders and wearing-surfaces inthe wall of said cavity, in combination with a cap or plate having a conical annular cavity, a projection in said cavity, and shoulders and wearingsurfaces in the wall of said cavity.

In testimony whereof I aiiix my signature in presence of two witnesses.

JACOB B. KREIDER. Witnesses:

D. C. REINOHL, WM. E. DYRE.