Abstract: In one aspect, a holder mountable to a friable substrate may include a self-drilling drywall fastener, a wall engaging base plate having an opening for receiving a fastener, and at least one leg extending from the base plate for holding an object. In another aspect, a holder may include a self-drilling drywall fastener having a drilling portion longer than a drywall thickness followed by a high-threaded portion, a wall engaging base plate, and at least one leg for holding an object. In still another aspect, a holder may include a self-drilling drywall fastener having a screw-like drilling portion longer than a drywall thickness followed by a high-threaded portion, a drywall engaging base plate having a recess for receiving a rotary driver and a pair of openings each capable of receiving a threaded drywall fastener and engaging threads thereof.

Abstract: A method of manufacturing a composite seal assembly. A primary sealing ring in generally frustoconical form is cut from a cylindrical billet of a resinous fluorocarbon material so as to have first and second principal surfaces each inclined with respect to the axis of the billet. The ring thus formed is supported against movement by disposing a relatively rigid annular casing unit adjacent the ring, with the ring lying within the casing opening, and bonding the casing element to the seal ring by molding an elastomeric collar of thin cross-section between a portion of the second surface of the ring and a part of said casing.

Abstract: A fluorocarbon seal including a formed resin ring element which is adapted to serve both as a primary lip and an auxiliary or excluder lip, in which at least a portion of the lip surface contains hydrodynamic formations consisting of grooves or the like indented or debossed surfaces rather than upstanding or protruding vanes or ribs, and wherein the resinous seal ring element as a whole is in the form of a generally frusto-conical ring having an intermediate portion thereof bonded by an annular collar unit to an associated casing.