Patent US3706304A successfully refreshed from Google Patents.
Patent US3568746A successfully refreshed from Google Patents.
US3568746A
Expired / Lapsed
US
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Self-locking threaded fastener
Assignee: Harvard Industries Inc
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Filing: 1967-02-06
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Granted: 1971-03-09
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Expires: 1987-02-06
Abstract
Abstract A reusable self-locking threaded fastener is provided having a patch of nylon or like thermoplastic material bonded to several convolutions of the unmodified thread surfaces and gradually merging at its boundary edge portions into the thread surfaces, the nylon patch being melted and fused and solidified without work-shaping pressures and containing from about 0.1 percent to about 5 percent by weight of molybdenum disulfide; a reusable self-sealing and self-locking fastener is provided in which the unmodified nylon patch has a circumferential extent of about 200* to about 300*; by adding to the nylon patch molybdenum disulfide the circumferential extent may be 360*; a method of forming the self-sealing and self-locking fasteners is provided wherein the heated fastener has the nylon in powdered form, and if desired the molybdenum disulfide mixed therein, dropped thereonto while the fastener rotates about its longitudinal axis to melt and hold a quantity of the nylon thereon, after which the fastener may be heated to the fusion temperature of the nylon to further melt the patch; further a primer coating of epoxy resin is provided between the patch and the fastener; the resultant fastener can be reused a minumum of five times and still retain the desired self-locking and self-sealing characteristics thereof.
Inventors
- 👤 Charles C Faroni
- 👤 John S Humphrey Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:59
CPC Classifications
F; F16; F16B; F16B33/00; F16B33/06; F16B39/00; F16B39/22; F16B39/28; F16B39/34; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/947
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
79 words
A self-locking threaded fastener wherein the self-locking characteristic is provided by a patch of solid thermoplastic material bonded to a plurality of convolutions of the unmodified surfaces of the thread and gradually merging at its boundary edge portions into such surfaces of the thread, said patch being formed of such thermoplastic material melted and fused and solidified without work-shaping pressures, said thermoplastic material containing from about 0.1 percent by weight to about 5 percent by weight of molybdenum disulfide.
Claim 2
Dependent Claim
79 words
A self-locking threaded fastener wherein the self-locking characteristic is provided by a patch of solid thermoplastic material bonded to a plurality of convolutions of the unmodified surfaces of the thread and gradually merging at its boundary edge portions into such surfaces of the thread, said patch being formed of such thermoplastic material melted and fused and solidified without work-shaping pressures, said thermoplastic material containing from about 0.1 percent by weight to about 5 percent by weight of molybdenum disulfide.
Claim 3
Dependent Claim
33 words
The self-locking threaded fastener set forth in claim 1, wherein the patch is of the shape of a free-form liquid pool of the thermoplastic material adhered to the unmodified surfaces of the thread.
Claim 4
Dependent Claim
38 words
The self-locking threaded fastener set forth in claim 1, wherein the patch is of limited longitudinal extent to provide at least one uncoated full thread convolution between the patch and one end of the thread of the fastener.
Claim 5
Dependent Claim
35 words
The self-locking threaded fastener set forth in claim 1, wherein the thermoplastic material is selected from the class consisting of polyamide resins, vinyl chloride-vinyl acetate copolymer resins, polypropylene resins and copolymers of tetrachlorethylene and hexapropylene.
Claim 6
Dependent Claim
16 words
The self-locking threaded fastener set forth in claim 1, wherein the thermoplastic material is nylon 11.
Claim 7
Dependent Claim
22 words
The self-locking threaded fastener set forth in claim 1, wherein the thermoplastic material contains about 1 percent by weight of molybdenum disulfide.
Claim 8
Dependent Claim
22 words
The self-locking threaded fastener set forth in claim 1, wherein the molybdenum disulfide has a particle size less than about 1 micron.
Claim 9
Dependent Claim
23 words
The self-locking threaded fastener set forth in claim 1, wherein said fastener is externally threaded and the threads thereon are of standard form.
Claim 10
Dependent Claim
52 words
The self-locking threaded fastener set forth in claim 1, wherein said fastener is internally threaded and the thread is of standard form, and the plastic patch is of limited longitudinal extent to provide at least one uncoated full thread convolution between the patch and the end of the thread of the fastener.
Claim 11
Dependent Claim
102 words
A self-locking threaded fastener wherein the self-locking characteristic is provided by a patch of solid thermoplastic material bonded to a plurality of convolutions of the unmodified surfaces of the thread and gradually merging at its boundary edge portions into such surfaces of the thread, a primer coating of synthetic organic resin material disposed between the surfaces of the thread and said patch to provide good adherence therebetween, said patch being formed of such thermoplastic material melted and fused and solidified without work-shaping pressures, said thermoplastic material containing from about 0.1 percent by weight to about 5 percent by weight of molybdenum disulfide.
Claim 12
Dependent Claim
102 words
A self-locking threaded fastener wherein the self-locking characteristic is provided by a patch of solid thermoplastic material bonded to a plurality of convolutions of the unmodified surfaces of the thread and gradually merging at its boundary edge portions into such surfaces of the thread, a primer coating of synthetic organic resin material disposed between the surfaces of the thread and said patch to provide good adherence therebetween, said patch being formed of such thermoplastic material melted and fused and solidified without work-shaping pressures, said thermoplastic material containing from about 0.1 percent by weight to about 5 percent by weight of molybdenum disulfide.
Claim 13
Dependent Claim
18 words
The self-locking threaded fastener set forth in claim 10, wherein said primEr coating is essentially an epoxy resin.
Claim 14
Dependent Claim
35 words
The self-locking threaded fastener set forth in claim 11, wherein the primer coating of epoxy resin is cured by heating to a temperature in the range of from about 400* F. to about 500* F.
Claim 15
Dependent Claim
24 words
The self-locking threaded fastener set forth in claim 11, wherein the thickness of the primer coating is on the order of about 0.01 mil.
Claim 16
Dependent Claim
31 words
The self-locking threaded fastener set forth in claim 10, wherein said fastener is internally threaded and the patch is of the shape of a free-form liquid pool of the thermoplastic material.
Claim 17
Dependent Claim
95 words
An externally threaded self-locking and self-sealing fastener wherein the self-locking and self-sealing characteristics are provided by a patch of solid thermoplastic material bonded to a plurality of convolutions of the unmodified surfaces of the thread and gradually merging at its boundary edge portions into such surfaces of the thread, the circumferential extent of said patch being at least about 200*said patch being formed of such thermoplastic material melted and fused and solidified without such work-shaping pressures, said thermoplastic material containing from about 0.1 percent by weight to about 5 percent by weight of molybdenum disulfide.
Claim 18
Dependent Claim
95 words
An externally threaded self-locking and self-sealing fastener wherein the self-locking and self-sealing characteristics are provided by a patch of solid thermoplastic material bonded to a plurality of convolutions of the unmodified surfaces of the thread and gradually merging at its boundary edge portions into such surfaces of the thread, the circumferential extent of said patch being at least about 200*said patch being formed of such thermoplastic material melted and fused and solidified without such work-shaping pressures, said thermoplastic material containing from about 0.1 percent by weight to about 5 percent by weight of molybdenum disulfide.
Claim 19
Dependent Claim
34 words
The externally threaded self-locking and self-sealing fastener set forth in claim 15, wherein the thermoplastic material contains about 1 percent by weight of molybdenum disulfide having a particle size less than about 1 micron.
Claim 20
Dependent Claim
21 words
The externally threaded self-locking and self-sealing fastener set forth in claim 15, wherein the circumferential extent of said patch is 360*.
Claim 21
Dependent Claim
118 words
An externally threaded self-locking and self-sealing fastener wherein the self-locking and self-sealing characteristics are provided by a patch of solid thermoplastic material bonded to a plurality of convolutions of the unmodified surfaces of the thread and gradually merging at its boundary edge portions into such surfaces of the thread, the circumferential extent of said patch being at least about 200*, a primer coating of synthetic organic resin material disposed between the surfaces of the thread and said patch to provide good adherence therebetween, said patch being formed of such thermoplastic material melted and fused and solidified without work-shaping pressures, said thermoplastic material containing from about 0.1 percent by weight to about 5 percent by weight of molybdenum disulfide.
Claim 22
Dependent Claim
118 words
An externally threaded self-locking and self-sealing fastener wherein the self-locking and self-sealing characteristics are provided by a patch of solid thermoplastic material bonded to a plurality of convolutions of the unmodified surfaces of the thread and gradually merging at its boundary edge portions into such surfaces of the thread, the circumferential extent of said patch being at least about 200*, a primer coating of synthetic organic resin material disposed between the surfaces of the thread and said patch to provide good adherence therebetween, said patch being formed of such thermoplastic material melted and fused and solidified without work-shaping pressures, said thermoplastic material containing from about 0.1 percent by weight to about 5 percent by weight of molybdenum disulfide.
Claim 23
Dependent Claim
21 words
The externally threaded self-locking and self-sealing fastener set forth in claim 18, wherein said primer coating is essentially an epoxy resin.
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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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |