Patent ID: 7966915

Claim:
An extensive device comprising: a rod comprising a first end and a second end; a polygonal sphere comprising a first tunnel for receiving the rod therethrough, disposed on the rod near the second end and retained on the rod with a first restraining element; a socket being formed with: a polygonal cavity for receiving the polygonal sphere so that the wall of the polygonal cavity is in contact with the surface of the polygonal sphere; a second tunnel for receiving the second end of the rod; and a groove defined in the wall of the polygonal cavity; and a second restraining element fit in the groove of the socket to retain the polygonal sphere in the polygonal cavity of the socket; wherein the rod is able to move axially between a first position and a second position with respect to the socket and the polygonal sphere; wherein when the rod is located at the first position, the second end and the first restraining element are received in the second tunnel and the rod and the socket are coaxial; and wherein when the rod is located at the second position, the second end is spaced from the second tunnel and the rod is adapted for pivoting with respect to the socket.