Abstract: A compact joint coupling for a prosthetic brace can maintain a fixed state and can accommodate bending motion of the brace. A rotor having a recessed groove formed therein is rotatably mounted on a central shaft between a first coupling base and a second coupling base. Protruding pieces on the second coupling base are adapted to fit slidably within the groove. In addition, the surface of the second coupling base is covered with a cover for operating an operation pin. The groove is adapted to hold a plurality of spheres. The spheres can be manually introduced into, and removed from, the groove. The spheres are adapted to slide within the groove as the brace is bent. A purpose of the spheres is to prevent the brace from being bent by more than a predetermined amount.

Abstract: A simple and compact joint coupling for a prosthetic brace can maintain an integrally fixed state, adapt for a movable region training and a movable state, and has a small dividing of a bending angle. The rotor having a recessed groove formed is rotatably intruded into a first coupling base, and protruding pieces and provided on the circumferential surface of a second coupling base are fitted to the recessed groove. In addition, the surface of the second coupling base is covered with an operation cover for operating an operation pin. A first coupling base and the second coupling base are pivoted so as to be rotated by a central shaft and a stopper screw for preventing the fall off of the central shaft. The circumference of the recessed groove for arraying and charging the spheres is bisected by convex parts and. Spheres are arrayed and charged in the recessed groove of one bisected half, and a freely expansible and contractible spring is attached to the recessed groove of the other half.