Automatic stay open upright toilet seat spring hinge structure

Abstract

This present invention with the new added structure improvements to a single spring hinge for automatically keeping a toilet seat open and raised in an upright vertical position at all times. the previous single spring hinge which a patent had already been granted by the U.S. PTO (Publication Number U.S. Pat. No. 4,751,765 A (Application Filed Number U.S. Ser. No. 06/938,604) which mainly utilizes the tension adjustment stand, made of metal or plastic composite material, to preserve the original intended functions, the spring hinge which includes a first member, a second member, a spring, a spring seat, a tensile adjustment seat, a tensile adjustment pin, a shaft, and two holding heads. The holding heads each include a hollow hat and a set of slots radially extending to form a set of claws fixed inside the hollow hat, the central portion of the slots being inwardly concave and an opening whose diameter is slightly smaller than the diameter of the shaft. Thus, the shaft penetrating through the opening is pressed and secured by the claws so as to prevent any withdrawal of the shaft from the opening.

Dependencies are inferred from the claim text.