Self-raising seat

Claim 1

Self-raising water closet seat adapted to be mounted on a water closet bowl comprising, a water closet seat having a central opening and a continuous tongue extending rearwardly of said seat, a pivot tube positioned through said tongue and having end projecting beyond the seat at each side with the pivot tube fixed against rotation relative to the seat, spaced hinge posts fixed to said bowl and receiving; on the tube projection ends with said pivot tube being rotatable in the hinge posts, an elongated torsion spring composed of a bundle of unconnected leaf springs axially slidable with respect to each other carried within said pivot tube and projecting beyond said pivot tube at one end only and fixed to the pivot tube at the other end by means of a narrowed swaged end of said tube clamping said leaf springs while permitting axial slidable movement of said springs relative to said tube, and engaging and twisting means within the hinge post at the side where the spring projects beyond said pivot tube end to engage the spring projecting end and twist the spring in a seat-raising direction to bias the seat to raised position, with respect to said bowl said engaging and twisting means including a fixed stationary non-round bore integral with said hinge post.