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Rotary joint especially for a knee prosthesis

  • US 4,795,474 A
  • Filed: 11/05/1986
  • Issued: 01/03/1989
  • Est. Priority Date: 11/06/1985
  • Status: Expired due to Term
First Claim
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1. A rotary joint, especially for a prosthesis, adapted to withstand high tilting forces transverse to an axis of relative rotation of two members to be connected by the joint, said rotatable joint comprising:

  • an outer part formed with a disk portion and a central boss connected to said disk portion at a transition region between said boss and said disk portion;

    an inner part formed with a disk portion juxtaposed with said disk portion of said outer part, and a central boss coaxial with said central boss of said outer part along said axis and received therein, said central boss of said inner part being connected to said disk portion of said inner part at a respective transition region between said boss and said disk portion of said inner part;

    an array of tapered bearing rollers received between said bosses and defining therewith a tapered-roller bearing having a small diameter end substantially at said transition regions;

    means for bracing outer peripheries of said disk portions rotatably against one another;

    means for connecting each of said parts to a respective member so that said members have an axis of relative rotation and are connected to said joint, and a locking device for locking said inner and outer parts against rotation relative to said locking device including a locking element movable relative to said inner and outer parts radially thereof, said inner and outer parts being formed with recesses adapted to receive said locking element for immobilizing said parts against relative rotation, said parts being relatively rotatable upon retraction of said element radially from said recesses.

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