Coating of screws
AssigneeITW Limited
InventorRobert H. Day
Life of this patent
Estimating the term…
Abstract
A method of making a screw threaded fastener (1, 10) for fixing cladding to a building includes the steps of applying a mastic covering (5, 15) to a screw threaded portion (4, 13) of the fastener, and applying a non-sticky protective coating (6, 16) to the outside of the mastic covering (5, 15) so as to prevent the fasteners (1, 10) from sticking together during handling and packaging of the same. Preferably the protective coating (6, 16) is as coating of a waxy substance and is applied to the outside of the mastic covering (5, 15) by means of a dipping or spraying process or operation. The fasteners are then easy to use and form a water-tight, moisture and vapor-proof seal with respect to their supports or substrates. The waxy coating (16) may also be applied to the drill point (12) so as to act as a lubricant during driving of the fastener.
Claims12
A screw threaded fastener, comprising:
- a screw threaded portion defined upon a shank of said fastener;
- an uncured, tacky mastic covering disposed around said screw threaded portion of said fastener for providing corrosion-prevention and sealant properties to said fastener when said fasten is threadedly engaged within a substrate;
- and
- a waxy coating covering said uncured, tacky mastic disposed upon said screw threaded portion of said fastener so as to prevent said fastener from sticking to similar fasteners during handling and packaging of said fasteners by rendering outer peripheral portions of said fasteners non-tacky and for preventing deterioration of said uncured, tacky mastic covering.
Dependencies are inferred from the claim text.