Abstract: Swivel hook units are usable to position a fabric cover, such as a swimming pool cover. A base portion of unitary construction can be attached to a fabric cover via a strap sewn to the cover. A hook member is attached to the base portion via a fastener device which permits rotational displacement of the hook member to accommodate adjustment during installation. A single rivet-type fastener device may be employed. A swivel hook unit may have a flat bottom for placement against a fabric cover without protrusions which would facilitate abrasion of the cover fabric during use. A flexible member to restrain the hook member from unintended disconnection from an eyebolt may include an end section contour configuration to resist lateral displacement of the flexible member relative to the hook member.

Abstract: A pool cover has a compressible safety edge providing resilient conformance to obstructions over a wide range of atmospheric and loading conditions. Pool covers can be stretched over the water surface of a swimming pool, extending securely onto the surrounding apron except in the area of poolside obstructions. A safety edge may include a resilient compressible foam core supported and protected by a tough flexible fabric enclosure attached to the edge of the pool cover so as to be held against and conform to the obstruction to secure the opening. Solid or hollow foam cylinders of different shapes may be used and forms of extruded plastic elements are shown.

Abstract: A disappearing anchor for mounting in a wooden surface, for example, a deck surrounding a swimming pool, is provided. In accordance with the invention, a collar member comprising an axial sleeve defining a central aperture and a radially extending flange is provided. The aperture accommodates the upper end of the cylindrical housing of the anchor device, and is mounted, for example by press-fitting, so that the upper surface of the radially extending flange is flush with the upper surface of the cylindrical housing. The anchor and fixed collar are then placed in the wooden deck which is counterbored so that the top surface of the radially extending flange is flush with the wooden deck.