Abstract: The present invention provides an improved non-bristled brush for cleaning underwater surfaces, such as swimming pool walls and bottoms, and uses a sponge like cushion that is wrapped in absorbent material which can loosen dirt, algae and leaf stains.

Abstract: A roof construction has a substantially flat, horizontal substrate, which may be of insulating material, having mounted thereon at least one structure having an inclined surface. A membrane of water-impervious material extends over the substrate and over the structure. The portion of the membrane covering the inclined surface of the structure has photocells thereon, the inclination and orientation of the inclined surface being selected for maximum radiation reception from the sun. The structure may be of generally triangular shape, is thermally insulating, and a plurality of parallel structures may be provided, with photocells on parallel, inclined surfaces. The structures may have additional surfaces which are opposite and facing the first mentioned surface of an adjacent structure, which additional surface or surfaces is provided with a reflective film for reflecting radiation into the photocells of the adjacent structure.

Abstract: A roof membrane anchoring system is provided of the non-penetrating type, including a base member with an enlarged head carried by an upstanding stem, a disc, and a socket cap which includes a top, depending legs, and feet carried at the bottoms of the legs, the cap being of somewhat resilient material. A clamp is provided for constricting the legs after the socket cap is placed over the head. When uplift forces on the membrane act to deform the disc, it acts against surfaces of the feet of the socket cap, to urge the feet together, thereby providing greater security of the socket cap during periods of high wind velocity. The base member has a passage for insertion therethrough of a fastener, the passage including a quantity of self-curing adhesive material which is cured after insertion of the linear fastener, the adhesive material serving to adhere the linear fastener either to the base member or to a holding element for the linear fastener, or both.

Abstract: A roof membrane anchoring system is provided comprising upper and lower plates having a water impervious membrane between them. Fasteners secure the lower plate to the roof substrate, and the upper plate is secured against the membrane by a linear fastener penetrating the membrane or by a head and socket engagement without membrane penetration.A plurality of membrane anchoring plates have extending between and secured to them linear elements over the membrane, to limit membrane lift forces.

Abstract: A membrane anchor system including a body made of resilient metal comprising a central region with an opening therein, a downwardly sloping region and a peripheral region outwardly of the downwardly sloping region; the downwardly sloping region has radially extending upwardly convex regions therein to resist upward flexure. A linear fastener extends through the body and through the membrane, and mastic is placed between the body and the membrane.

Abstract: A body for use in a membrane anchor system made of resilient metal a central region with an opening therein, a downwardly sloping region and a peripheral region outwardly of the downwardly sloping region. An anchor system including said body, wherein a linear fastener extends through the body and through a membrane, and mastic is placed between the body and the membrane.An anchor system utilizing the said body, and having a sheet of water-impervious material extending over and beyond the body, and adhered to the body and the membrane.

Abstract: A membrane anchor comprises a disc of rubber-like material having a central opening and downwardly inclined upper and lower surfaces. The lower surface has grooves for receiving mastic.