Abstract: A universal joint is provided and comprises a male and female member which are rotatably coupled together even when the members are not in axial alignment with each other. The female member includes a socket with a polygonal cross-sectional shape while the male member includes a spherical portion having polygonal faces circumscribed diametrically therearound. The spherical portion is insertable into the socket whereby the polygonal faces on the spherical portion mesh with the polygonal socket in the female member so that the two members are rotatably drivingly coupled together.

Abstract: An improved clamp is provided for clamping a pair of crossing elongated members together wherein the members cross each other at a predetermined angle. The clamp comprises a base which is disposed between the elongated members at their intersection and includes a channel formed on each side of the base for receiving the elongated members therein. The free ends of a U-bolt are disposed through registering apertures in the base so that one of the elongated members is entrapped in one of the channels and between the U-bolt and the base. A bar having apertures which register with the free ends of the U-bolt is placed over the free ends so that the other elongated member is entrapped in the other channel between the bar and the base. Nut members threadably engage the free ends of the U-bolt to secure the bar to the U-bolt and to thereby clamp the elongated members together at a predetermined angle.