US Patent 7281998 Height adjustment mechanism for batting tee

An improved height adjustment mechanism for a batting tee uses an adjustment screw that attaches a compressible washer assembly to the bottom of an inner telescoping member to spread a compressible washer, thereby increasing the diameter of the compressible washer assembly and consequently adjusting internal friction between the washer assembly and the inner surface of an outer telescoping member to a desired amount necessary to hold the inner telescoping member stationary within the external telescoping member while the tee is being used while still allowing manual height adjustment of the batting tee as may be desired by the batter.