US4191677A
Expired / Lapsed
US
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Self-locking threaded fastener product
Assignee: Federal Screw Works
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Filing: 1977-10-21
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Granted: 1980-03-04
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Expires: 1997-10-21
Abstract
Abstract This disclosure relates to a new self-locking threaded fastener means having a patch on the threaded portion thereof to provide self-locking properties. The patch may be comprised of a thermoplastic polymer such as a thermoplastic epoxy adhesive system and is applied to the threaded fastener in an unpolymerized state and is allowed to polymerize in situ. Since an unpolymerized adhesive composition would be applied as a liquid, it would not be necessary to heat the fastener, thus saving valuable energy as well as eliminating the chance of destroying any corrosion resistant coating on the fastener such as phosphate and oil. This new fastener means also has good multiple usage characteristics in that it may be installed and removed several times without losing its self-locking properties.
Inventors
- 👤 Norman S. Strand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:57
CPC Classifications
C; C09; C09J; C09J163/00; Y; Y10; Y10S; Y10S411/00; Y10S411/90; Y10S411/901; Y10S411/902; Y10S411/903
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
55 words
A self-locking threaded fastener means having a patch on the threaded portion thereof to provide said self-locking properties, said patch comprising a cured thermoplastic epoxy adhesive which has been mixed together off the fastener means and applied to said fastener in an unpolymerized state and allowed to polymerize to a thermoplastic polymer on said fastener.
Claim 2
Dependent Claim
55 words
A self-locking threaded fastener means having a patch on the threaded portion thereof to provide said self-locking properties, said patch comprising a cured thermoplastic epoxy adhesive which has been mixed together off the fastener means and applied to said fastener in an unpolymerized state and allowed to polymerize to a thermoplastic polymer on said fastener.
Claim 3
Dependent Claim
30 words
The fastener means of claim 1 wherein said thermoplastic epoxy adhesive comprises an epoxy resin portion and a polymerizing agent portion in sufficient amount to polymerize said epoxy resin portion.
Claim 4
Dependent Claim
16 words
The fastener means of claim 2 wherein said epoxy resin portion comrises a thermoplastic epoxy resin.
Claim 5
Dependent Claim
17 words
The fastener means of claim 3 wherein said thermoplastic epoxy resin is diglycidyl ether of bisphenol A.
Claim 6
Dependent Claim
71 words
The fastener means of claim 3 wherein said epoxy resin portion further comprises a filler to improve mechanical properties comprised of at least one material selected from the group consisting of glass beads, silicon carbide, silica, quartz, clay, beta eucryptite, alumina, polyvinylidene chloride micro-balloons, fumed silica to increase adhesion, glass fibers to increase strength, imbiber beads to absorb oil, and hydrophobic fumed silica to prevent absorption of water by the adhesive.
Claim 7
Dependent Claim
13 words
The fastener means of claim 5 wherein said imbiber beads are alkylstyrene polymer.
Claim 8
Dependent Claim
28 words
The fastener means of claim 2 wherein said polymerizing agent portion comprises at least one material selected from the group consisting of difunctional amines or phosphine based catalysts.
Claim 9
Dependent Claim
13 words
The fastener means of claim 7 wherein said polymerizing agent portion comprises monoethanolamine.
Claim 10
Dependent Claim
31 words
The fastener means of claim 7 wherein said polymerizing agent portion further comprises methylene-bis-4-cyclohexylamine and at least one material selected from the group consisting of asbestos-type thixotropic agents or fumed silica.
Claim 11
Dependent Claim
146 words
A self-locking threaded fastener means having a patch on the threaded portion thereof to provide self-locking properties, said patch comprising a cured adhesive composition comprised of: an epoxy resin portion comprised of a thermoplastic epoxy resin and a filler comprised of at least one material selected from the group consisting of glass beads, silicon carbide, silica, quartz, clay, beta eucryptite, alumina, polyvinylidene chloride micro-balloons, fumed silica, glass fibers, imbiber beads, and hydrophobic fumed silica, and a polymerizing agent portion comprised of at least one material selected from the group consisting of difunctional amines or phosphine based catalysts, methylene-bis-4-cyclohexylamine, and at least one material selected from the group consisting of asbestos-type thixotropic agents or fumed silica, said adhesive composition having been mixed together off the fastener means and applied to said fastener in an unpolymerized state and allowed to polymerize to a thermoplastic polymer on said fastener.
Claim 12
Dependent Claim
146 words
A self-locking threaded fastener means having a patch on the threaded portion thereof to provide self-locking properties, said patch comprising a cured adhesive composition comprised of: an epoxy resin portion comprised of a thermoplastic epoxy resin and a filler comprised of at least one material selected from the group consisting of glass beads, silicon carbide, silica, quartz, clay, beta eucryptite, alumina, polyvinylidene chloride micro-balloons, fumed silica, glass fibers, imbiber beads, and hydrophobic fumed silica, and a polymerizing agent portion comprised of at least one material selected from the group consisting of difunctional amines or phosphine based catalysts, methylene-bis-4-cyclohexylamine, and at least one material selected from the group consisting of asbestos-type thixotropic agents or fumed silica, said adhesive composition having been mixed together off the fastener means and applied to said fastener in an unpolymerized state and allowed to polymerize to a thermoplastic polymer on said fastener.
Claim 13
Dependent Claim
17 words
The fastener means of claim 10 wherein said thermoplastic epoxy resin is diglycidyl ether of bisphenol A.
Claim 14
Dependent Claim
13 words
The fastener means of claim 10 wherein said polymerizing agent portion comprises monoethanolamine.
Claim 15
Independent Claim
65 words
A method of manufacturing a self-locking threaded fastener means having a patch on the threaded portion thereof to provide self-locking properties, which comprises: applying an unpolymerized patch material comprised of a thermoplastic epoxy adhesive system which has been mixed together off the fastener means to said threaded fastener, and allowing said umpolymerized thermoplastic patch material to polymerize to a thermoplastic polymer on said threaded fastener.
Claim 16
Independent Claim
65 words
A method of manufacturing a self-locking threaded fastener means having a patch on the threaded portion thereof to provide self-locking properties, which comprises: applying an unpolymerized patch material comprised of a thermoplastic epoxy adhesive system which has been mixed together off the fastener means to said threaded fastener, and allowing said umpolymerized thermoplastic patch material to polymerize to a thermoplastic polymer on said threaded fastener.
Claim 17
Dependent Claim
29 words
The method of claim 13 wherein said thermoplastic epoxy adhesive comprises an epoxy resin portion and a polymerizing agent portion in sufficient amount to polymerize said epoxy resin portion.
Claim 18
Dependent Claim
15 words
The method of claim 14 wherein said epoxy resin portion comprises a thermoplastic epoxy resin.
Claim 19
Dependent Claim
16 words
The method of claim 15 wherein said thermoplastic epoxy resin is diglycidyl ether of bisphenol A.
Claim 20
Dependent Claim
70 words
The method of claim 15 wherein said epoxy resin portion further comprises a filler to improve mechanical properties comprised of at least one material selected from the group consisting of glass beads, silicon carbide, silica, quartz, clay, beta eucryptite, alumina, polyvinylidene chloride micro-balloons, fumed silica to increase adhesion, glass fibers to increase strength, imbiber beads to absorb oil, and hydrophobic fumed silica to prevent absorption of water by the adhesive.
Claim 21
Dependent Claim
12 words
The method of claim 17 wherein said imbiber beads are alkylstyrene polymer.
Claim 22
Dependent Claim
26 words
The method of claim 14 wherein said polymerizing agent portion comprises at least one material from the group consisting of difunctional amines or phosphine based catalysts.
Claim 23
Dependent Claim
12 words
The method of claim 19 wherein said polymerizing agent portion comprises monoethanolamine.
Claim 24
Dependent Claim
30 words
The method of claim 19 wherein said polymerizing agent portion further comprises methylene-bis-4-cyclohexylamine and at least one material selected from the group consisting of asbestos-type thixotropic agents or fumed silica.
Claim 25
Independent Claim
161 words
A method of manufacturing a self-locking threaded fastener means having a patch on the threaded portion thereof to provide self-locking properties, which comprises: applying an unpolymerized patch material comprised of a thermoplastic epoxy adhesive system which has been mixed together off the fastener means to said threaded fastener, said thermoplastic epoxy adhesive being comprised of: an epoxy resin portion comprised of a thermoplastic epoxy resin and a filler comprised of at least one material selected from the group consisting of glass beads, silicon carbide, silica, quartz, clay, beta eucryptite, alumina, polyvinylidene Chloride micro-balloons, fumed silica, glass fibers, imbiber beads, and hydrophobic fumed silica, and a polymerizing agent portion comprised of at least one material selected from the group consisting of difunctional amines or phosphine based catalysts, methylene-bis-4-cyclohexylamine, and at least one material selected from the group consisting of asbestos-type thixotropic agents or fumed silica, and allowing said unpolymerized thermoplastic patch material to polymerize to a thermoplastic polymer on said threaded fastener.
Claim 26
Independent Claim
161 words
A method of manufacturing a self-locking threaded fastener means having a patch on the threaded portion thereof to provide self-locking properties, which comprises: applying an unpolymerized patch material comprised of a thermoplastic epoxy adhesive system which has been mixed together off the fastener means to said threaded fastener, said thermoplastic epoxy adhesive being comprised of: an epoxy resin portion comprised of a thermoplastic epoxy resin and a filler comprised of at least one material selected from the group consisting of glass beads, silicon carbide, silica, quartz, clay, beta eucryptite, alumina, polyvinylidene Chloride micro-balloons, fumed silica, glass fibers, imbiber beads, and hydrophobic fumed silica, and a polymerizing agent portion comprised of at least one material selected from the group consisting of difunctional amines or phosphine based catalysts, methylene-bis-4-cyclohexylamine, and at least one material selected from the group consisting of asbestos-type thixotropic agents or fumed silica, and allowing said unpolymerized thermoplastic patch material to polymerize to a thermoplastic polymer on said threaded fastener.
Claim 27
Dependent Claim
16 words
The method of claim 22 wherein said therrmoplastic epoxy resin is diglycidyl ether of bisphenol A.
Claim 28
Dependent Claim
12 words
The method of claim 22 wherein said polymerizing agent portion comprises monoethanolamine.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |