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US 5,356,254 AGranted
High temperature self-locking threaded fastener
AssigneeNylok Fastener Corporation
InventorsAnthony E. DiMaio, Richard Duffy, Mario Pollizzi, Eugene D. Sessa
Life of this patent
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Abstract
This invention describes self-locking threaded fasteners having a patch or patches of fused high-temperature-resistant resin adhered to a portion of the threads, providing self-locking capabilities at temperatures above 400.degree. F., well beyond the range of temperatures attainable using prior art patch materials such as nylon. A process for making such fasteners by spraying finely-divided high-temperature-resistant resin powder onto the threads of a fastener also is claimed.
Claims34
A threaded fastener having a self-locking patch, comprising:
- a threaded portion adapted for engagement with a mating fastener, and
- a patch of fused high-temperature-resistant resin powder adhering to at least part of said threaded portion, said patch providing sufficient frictional engagement between said threaded fastener and said mating fastener to satisfy the minimum removal torque requirements set forth in MIL-F-18240E after exposure to a temperature in excess of 400.degree. F. for a period of time in excess of three hours, wherein said high-temperature-resistant resin powder is selected from the group consisting of poly (hexamethyl isophthalamide), poly (heptamethyl isophthalamide), and poly (octamethyl isophthalamide), and mixtures thereof.
A threaded fastener having a self-locking patch, comprising:
- a threaded portion adapted for engagement with a mating fastener, and
- a patch of fused high-temperature-resistant resin powder adhering to at least part of said threaded portion, said patch providing sufficient frictional engagement between said threaded fastener and said mating fastener to satisfy the minimum removal torque requirements set forth in IFI-124 after exposure to a temperature in excess of 400.degree. F. for a period of time in excess of one hour, wherein said high-temperature-resistant resin powder is selected from the group consisting of poly (hexamethyl isophthalamide), poly (heptamethyl isophthalamide), and poly (octamethyl isophthalamide), and mixtures thereof.
A threaded fastener having a self-locking patch, comprising:
- a threaded portion adapted for engagement with a mating fastener, and
- a patch of fused high-temperature-resistant resin powder mixed with an adhesive, adhering to at least part of said threaded portion, said patch providing sufficient frictional engagement between said threaded fastener and said mating fastener to satisfy the minimum removal torque requirements set forth in MIL-F-18240E after exposure to a temperature in excess of 400.degree. F. for a period of time in excess of three hours, wherein said high-temperature-resistant resin powder is selected from the group consisting of poly (hexamethyl isophthalamide), poly (heptamethyl isophthalamide), and poly (octamethyl isophthalamide), and mixtures thereof.
A threaded fastener having a self-locking patch, comprising:
- a threaded portion adapted for engagement with a mating fastener, and
- a patch of fused high-temperature-resistant resin powder mixed with an adhesive, adhering to at least part of said threaded portion, said patch providing sufficient frictional engagement between said threaded fastener and said mating fastener to satisfy the minimum removal torque requirements set forth in IFI-124 after exposure to a temperature in excess of 400.degree. F. for a period of time in excess of one hour, wherein said high-temperature-resistant resin powder is selected from the group consisting of poly (hexamethyl isophthalamide), poly (heptamethyl isophthalamide), and poly (octamethyl isophthalamide), and mixtures thereof.
A threaded fastener having a self-locking patch, comprising:
- a threaded portion adapted for engagement with a mating threaded fastener, and
- a patch of fused high-temperature-resistant resin powder adhering to at least part of said threaded portion, said patch providing sufficient frictional engagement between said threaded fastener and said mating threaded fastener to satisfy the minimum removal torque requirements set forth in MIL-F-18240E after exposure to a temperature in excess of 400.degree. F. for a period of time in excess of three hours.
A threaded fastener having a self-locking patch, comprising:
- a threaded portion adapted for engagement with a mating fastener, and
- a patch of fused high-temperature-resistant resin powder adhering to at least part of said threaded portion, said patch providing sufficient frictional engagement between said threaded fastener and said mating fastener to satisfy the minimum removal torque requirements set forth in IFI-124 after exposure to a temperature in excess of 400.degree. F. for a period of time in excess of one hour.
A threaded fastener having a self-locking patch, comprising:
- a threaded portion adapted for engagement with a mating fastener, and
- a patch of fused high-temperature-resistant resin powder mixed with an adhesive, adhering to at least part of said threaded portion, said patch providing sufficient frictional engagement between said threaded fastener and said mating fastener to satisfy the minimum removal torque requirements set forth in MIL-F-18240E after exposure to a temperature in excess of 400.degree. F. for a period of time in excess of three hours.
A threaded fastener having a self-locking patch, comprising:
- a threaded portion adapted for engagement with a mating fastener, and
- a patch of fused high-temperature-resistant resin powder mixed with an adhesive, adhering to at least part of said threaded portion, said patch providing sufficient frictional engagement between said threaded fastener and said mating fastener to satisfy the minimum removal torque requirements set forth in IFI-124 after exposure to a temperature in excess of 400.degree. F. for a period of time in excess of one hour.
Dependencies are inferred from the claim text.