Separable joint for arm and hub constructions

In a separable joint embodying a keyway-type connector with separable arms engaged therewith and secured against accidental displacement therefrom by securing means, the improvement characterized in that the connector comprises:

• (a) a hub having sides and opposite ends, a plurality of spaced, longitudinal, parallel apertures extending end to end through the hub positioned towards the sides of the hub and parallel, longitudinally extending slots extending between the sides of the hub and central portions of the apertures;
• (b) an elongated spline having ends and sides, a keyway slot extending from end to end through the spline and opening to one side, the sides of the spline contoured to conform to the sides of the corresponding apertures in the hub and to be releasable received therein with the keyway slot opening and the hub aperture slot aligned adjacent each other, the spline being spaced from the aperture to form a tolerance therebetween permitting a limited rang of rotation of the arm relative to the hub, said spline being means for providing a secure, but relatively loose fit and facilitating assemble and disassembly of the joint, and the spine having fixedly secured in its keyway slot a co-operative interlocking key formed in an end of a corresponding arm;
• and
• (c) securing means at the ends of the hub to prevent accidental removal of the splines and associated arms when in position in the hub apertures.