Self-locking joint, in particular orthotic joint

Details Self-locking joint, in particular orthotic joint Self-locking joint, in particular orthotic joint

A - Human Necessities

61

F

A61F 5/01 (2006.01) F16C 11/10 (2006.01)

Patent

CA 2168371

The object of the invention is to create a self-locking joint, in particular an orthotic joint, which may be unlocked with little effort, so that even handicapped patients may be able to unlock the joint. For that purpose, the joining pieces (1, 2) have curved profiles (5, 6) that cross each other at such a large angle that a rolling body (7) guided in both curved profiles (5, 6) and whose axis lies at the intersection between the median lines (10, 11) of the curve profiles (5, 6) moves freely along the median lines (10, 11) of the curved profiles (5, 6) when one joining piece (1, 2) rotates against the other. A self-locked state of the joint is reached when the .sigma. angle between imaginary tangents to the median lines (10, 11) applied to their intersection approaches zero and the line that connects the centres of the curvature circles of both curved profiles (5, 6) does not extend through the axis of rotation (4) of the joint in the crossing or contact point in the locked position.

L'objet de l'invention est de créer une articulation à blocage automatique, notamment une articulation d'orthèse, qui puisse être débloquée avec peu d'effort, de sorte que même des patients invalides puissent débloquer l'articulation. A cet effet les raccords (1, 2) ont des profils courbes (5, 6) qui se coupent selon un angle si large que lorsqu'un des raccords (1, 2) est mis en rotation à l'encontre de l'autre raccord, un corps de roulement (7), guidé dans les deux profils courbes (5, 6) et dont l'axe se situe au point d'intersection des lignes médianes (10, 11) des profils courbes (5, 6), se déplace sans contrainte le long des lignes médianes (10, 11) des profils courbes (5, 6). L'articulation est bloquée par blocage automatique lorsque l'angle alpha entre les tangentes imaginaires des lignes médianes (10, 11) qui passent par leur intersection s'approche de zéro et que la ligne qui relie les centres des cercles de courbure des deux profils courbes (5, 6) ne passe pas par l'axe de rotation (4) de l'articulation au point de croisement ou de contact en position bloquée.

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