From the surgical to the mechanical art / J. & E. Ferris.

  • J. & E. Ferris.
Date:
1891
Catalogue details

Licence: Public Domain Mark

Credit: From the surgical to the mechanical art / J. & E. Ferris. Source: Wellcome Collection.

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    DESCRIPTION OF PATENTED ANKLE-JOINTS WITH AND WITHOUT LATERAL MOTION. Fig. 2 shows construction of uni¬ versal ankle-joint. A. Ankle-joint articulates in block G. B. Bolt securing foot to leg. The extra block, G, is for shewing the lateral articular bearings F, F. I Fig. 3 shows construction of single ankle-joint. A. Ankle-joint articulates on foot. B. Bolt securing foot to leg. The cord D is attached the same in both styles. What we particularly wish to point out in the above cuts, are the following claims to originality :—Claim i : The semi¬ circle bearing F under block G, with ball shaped end, and bushing for same in foot. Claim 2 : These bearings force them to wear directly to the centre, which makes the adjust¬ ment perfect, and prevents any displacement whatever from wear. Claims 3 and 4 refer to the jointed bolt B, with pivot C and heel tendon D.