Improvements in artificial limbs / [Amos Lincoln Woodland].

  • Woodland, Amos Lincoln.
Date:
1899
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in artificial limbs / [Amos Lincoln Woodland]. Source: Wellcome Collection.

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    Woodland's Improvements in Artificial Limbs. treacherous bending of the knee joint. The construction of the foot will be fully explained in connection with Figs. 6 and 7, and in the same connection Fig. 2 will be explained. . In Fig. 3 it will be seen that inside of the shells A and B there are cavities (J and F. The upper part of the cavity 0 is made to neatly fit the sides of the stump, and the 5 lower section of the cavity is made as large as is consistent with strength and durability in the shell B. The knee joint is constructed by making a hole through the shell A at the knee from one side to the other large enough to receive the metal shell s. Also a hole is made to extend from the lower end of the cavity 0 through the shell A at the end of l() the knee, in which hole the shank t is firmly screwed from the cavity 0. The shank t is hollow, and the upper section of the hole is smooth and somewhat larger than the lower end section. The large and smooth portion is for the reception of the short round shaft F. The small hole at the lower end of the shank t is threaded to receive a set screw u (Fig. 10). Attached to the upper end of the shank t is an oval collar tl 15 large enough to encircle the knee bolt r, the metal shell s, and to allow these parts to be adjusted by a slight vertical movement. The sides of the collar t1 are straight for a short distance on both sides of the centre to allow the semi-circular collar or bushing v v room to move up and down inside it. The semicircular collar v is secured to the upper end of the shaft v1 and the wooden knee bolt r rests in the collar v, 20 and any wear of the bolt is compensated by raising the collar v and knee bolt r, by means of the set screw u, until the bolt r comes in contact with the top of the metal shell s. There are lips v2 at each side of the collar v which works in grooves t2, cut in the side of the collar t1 which helps to hold the collar v in position. The adjusting device above described, consisting of the threaded shank t, oval 25 collar t1 short shaft v1, semicircular piece v, and set-screw u, is fastened in the shell A at the lower extremity of the cavity 0 by having the shank t screwed from the lower end of the cavity 0 into the hole in the end of the shell A until the collars are in line with the holes in each side of the knee. The hollow metal cylindrical shell s is next inserted in the shell A at the side of the knee and passes 30 through the oval collar t1 and semicircular collar v and out at the opposite side of the knee. The shell is made of metal and is smooth and polished on its inner surface. The lower central longitudinal section of the shell is cut away in order to let the semicircular collar v come in contact with the wooden knee-bolt r, which passes through the shell as is more fully shewn in Fig. 9. 35 The shell s fits tight in the holes in the knee and cannot be turned by the action of any of the parts working in or on it and does not quite reach through the knee. The wooden knee-bolt r is next inserted in the shell s and through the collars t1 and v. The bolt r is a little longer than the shell s and is made to project slightly beyond it at each end. This bolt is made of very hard wood and has a narrow metal 40 band a little smaller than the bolt on each of its ends to prevent the bolt from being split. The bolt is polished and boiled or soaked in oil, and when in use it requires little or no lubrication. It also has a hole through the centre from end to end for the reception of the rod /. Next the shell B, with straps e e attached is put in position, so that there will be a strap at each end of the bolt r, and the eyes in the 45 straps e e will be in line with the centre of bolt r. The rod / passes through the straps e e and bolt r, and the nut f1 is screwed on the rod / and brings the straps e e firmly against the ends of the knee-bolt r. The hollow shell s and the semicircular collar v serve as a boxing for the knee bolt r, and in the event that the knee bolt wears so as to become loose or rattle it can be readily tightened by turning the 50 set-screw u, and thereby raising the bolt r up against the shell s. In Figs. 3, 4 and 5 the relative location of the different parts above described are shewn in the thigh, and in Figs. 9, 10 and 11 the same parts are shewn in detail in an enlarged view. The inferior part of the leg is adjusted to meet the requirements of the different 55 positions assumed in walking and sitting by means of the joint, stop-rod, nuts,
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