Quick release locking means for a cover

A quick release locking means and cover, said cover being adapated to be closed onto a ring member that is connected to an opening, such as a manhole, and has a horizontally and radially inward extended flange, said quick release locking means comprising angularly equal-spaced cross-shaped slots provided on said cover, and catch elements, push elements, and cotters in the same number as that of said cross-shaped slots;

• said cross-shaped slots each communicating with a through hole below said slot, and two holed fixing plates being symmetrically and oppositely provided below each said through hole;
• said catch elements each including a curved top portion projected toward said through hole, a curved lower portion projectable toward said flange of said ring member, and an inward curved surface between said curved top portion and said curved lower portion and facing toward said cover;
• and said catch elements each being pivotally connected to and between said two fixing plates provided below each said through hole by a pin extended through fixing holes provided on said curved top portion of said catch element and said fixing plates;
• said cotters each including a flat ring portion forming a top thereof and a long bar portion forming a lower body thereof, each said cotter being positioned in one of said cross-shaped slots with said flat ring portion projected from said slot and said long bar portion extended down into said through hole, and a spring being disposed around said long bar portion in said through hole;
• and
• said push elements each being perpendicularly screwed onto said long bar portion of said cotter and having a curved end pointing toward said catch element;
• whereby when each said cotter is depressed, said push element screwed thereto is moved to a position to radially push said curved lower portion of said catch element outward to engage with a lower edge of said flange on said ring member, bringing said cover to tightly lock to said ring member;
• and when each said cotter is pulled upward, said push element screwed thereto no longer pushes said curved lower portion of said catch element and allows said catch element to disengage from said flange on said ring member, allowing said cover to be easily lifted and removed from said ring member.