Patent ID: 7748686
Filing Date: 2010-07-06
Classification: E04F

Abstract:
1. A ball knob for anchoring a tube having an inside cylindrical wall to a support comprising: a spherical body having a flat circular top surface, a flat circular bottom surface, and an annular convex curved outside side wall, the annular convex curved outside side wall including an outer annular section adjacent the top surface, said section having a downwardly and outwardly curved annular tapered shape, a plurality of laterally spaced and outwardly extended continuous and flexible annular ribs integral with the annular convex curved side wall of the body, said ribs extending completely around the annular convex curved side wall of the body, said ribs adapted to be flexed inwardly and deformed to bias the ribs into annular surface sealing engagement with the inside cylindrical wall of the tube, a wall surrounding a hole in the body extended between said top and bottom surfaces of the body, said wall surrounding the hole having a cylindrical wall portion having a substantially uniform diameter and a cone-shaped recessed wall portion, and a fastener having a cylindrical shank located in a contact fit with the cylindrical wall portion surrounding the hole and a cone-shaped head in engagement with the cone-shaped recessed wall portion adapted to secure the ball knob to the support.