Self-sealing fastener
First Claim
Patent Images
1. A fastener covered with a self-sealing coating, said self-sealing coating comprising:
- one or more layers of a one-part moisture-curable sealant; and
a first layer of a frangible moisture barrier coating covering said one or more layers of one-part curable sealant, such that when the fastener is installed into a pre-drilled hole in a workpiece the frangible moisture barrier will break apart, thereby allowing moisture from a moisture source to reach the sealant so that the sealant will cure and form a seal between the faster and the workpiece, and at least a portion of said moisture barrier coating will be extruded rather than mixing with the portion of the sealant forming the seal between the fastener and the workpiece.
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Abstract
An apparatus for making and using a fastener suitable for use in airplane manufacture or repair that is coated with a pre-mixed moisture cure sealant. The sealant layer is coated with a frangible moisture barrier that will break apart when the fastener is installed, thus exposing the sealant to a moisture source. Once exposed to moisture, the sealant will begin to cure. Preferred embodiments also provide a premature cure indicator that provides a visual indication that the outer moisture resistant layer has been damaged.
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Citations
22 Claims
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1. A fastener covered with a self-sealing coating, said self-sealing coating comprising:
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one or more layers of a one-part moisture-curable sealant; and a first layer of a frangible moisture barrier coating covering said one or more layers of one-part curable sealant, such that when the fastener is installed into a pre-drilled hole in a workpiece the frangible moisture barrier will break apart, thereby allowing moisture from a moisture source to reach the sealant so that the sealant will cure and form a seal between the faster and the workpiece, and at least a portion of said moisture barrier coating will be extruded rather than mixing with the portion of the sealant forming the seal between the fastener and the workpiece. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A fastener covered with a self-sealing coating, said self-sealing coating comprising:
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one or more layers of a one-part moisture-curable sealant; one or more layers of a frangible moisture barrier coating on top of said one or more layers of the one-part curable sealant, such that when the fastener is installed the frangible moisture barrier layers will break apart allowing moisture to reach the sealant so that the sealant will cure; and in which the frangible moisture barrier coating layers comprise a non-solvent based size coat curable by actinic radiation. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of producing a fastener covered with a self-sealing coating, the method comprising:
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applying one or more layers of a one-part moisture-curable sealant to a fastener; and applying a layer of a frangible moisture barrier coating covering said one or more layers of the one-part curable sealant, such that when the fastener is installed into a pre-drilled hole in a workpiece the frangible moisture barrier will break apart, thereby allowing moisture from a moisture source to reach the sealant so that the sealant will cure and form a seal between the fastener and the workpiece, and at least a portion of the frangible moisture barrier will be extruded rather than mixing with the portion of the sealant forming the seal between the fastener and the workpiece. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification