Patent US4015504A successfully refreshed from Google Patents.
US4015504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-boring fastener and methods of use thereof
Assignee: Fairchild Industries Inc
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Filing: 1975-04-11
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Granted: 1977-04-05
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Expires: 1995-04-11
Abstract
Abstract A self-boring fastener comprising an elongated cylindrical element which intersects a driving means, said cylindrical element having a knife edge means axially projecting from the periphery of the extreme end thereof so as to extend beyond said end, and a thin knife edge element continuously, helically positioned about the outer periphery of said cylindrical element, said knife thread extending outwardly laterally from the outer periphery of said cylindrical element, said cylindrical element having an axial hole extending inwardly from the extreme end thereof so as to form an internal cavity in said cylindrical element. The method of fastening rubber, wood and other non-metallic materials either together or to base materials without the necessity of preformed bores or embedded metal mating parts and without incuring the problems of misalignment by use of the self-boring fastener.
Inventors
- 👤 Jose Rosan, Sr.
- 👤 Marvin P. Reece
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:20
CPC Classifications
F; F16; F16B; F16B25/00; F16B25/0036; F16B25/0042; F16B25/0057; F16B25/001; F16B25/0015; F16B25/0073; F16B35/00; F16B35/04; F16B35/041; F16B35/042; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/965; Y10S411/968
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
137 words
A self-boring fastener for installation in a boreless workpiece, comprising in combination; a workpiece composed of wood, rubber or synthetic plastic materials, and an elongated cylindrical element mounted within said workpiece, said cylindrical element having at least one end thereof provided with an axial cavity so as to form a continuous curcumferential wall member having an opened end and an oppositely disposed closed end wherein a compression chamber is defined by said axial cavity; said wall member being provided with a longitudinally extending knife edge at the open extremity thereof; said elongated cylindrical element being provided with a thin knife-edge element helically positioned about the outer periphery of said cylindrical element; driving means carried by said cylindrical element to rotatably embed the fastener in a workpiece; and a compressed core of workpiece material within said compression chamber.
Claim 2
Dependent Claim
137 words
A self-boring fastener for installation in a boreless workpiece, comprising in combination; a workpiece composed of wood, rubber or synthetic plastic materials, and an elongated cylindrical element mounted within said workpiece, said cylindrical element having at least one end thereof provided with an axial cavity so as to form a continuous curcumferential wall member having an opened end and an oppositely disposed closed end wherein a compression chamber is defined by said axial cavity; said wall member being provided with a longitudinally extending knife edge at the open extremity thereof; said elongated cylindrical element being provided with a thin knife-edge element helically positioned about the outer periphery of said cylindrical element; driving means carried by said cylindrical element to rotatably embed the fastener in a workpiece; and a compressed core of workpiece material within said compression chamber.
Claim 3
Dependent Claim
38 words
A self-boring fastener for installation in a boreless workpiece as described in claim 1 wherein the thin helical knife-edge element is positioned about the outer periphery of the portion of said cylindrical element which contains the axial cavity.
Claim 4
Dependent Claim
38 words
A self-boring fastener for installation in a boreless workpiece as described in claim 2 wherein said thin helical knife-edge element is circumferentially continuous and is defined by laterally inclined surfaces intersecting each other to form said knife-edge thereof.
Claim 5
Dependent Claim
28 words
A self-boring fastener for installation in a boreless workpiece as described in claim 3 wherein said driving means is positioned between the ends of the elongated cylindrical element.
Claim 6
Dependent Claim
27 words
A self-boring fastener for installation in a boreless workpiece as described in claim 3 wherein said driving means is positioned at one extremety of said cylindrical element.
Claim 7
Dependent Claim
56 words
A self-boring fastener for installation in a boreless workpiece as described in claim 4 wherein the elongated cylindrical element is provided with the thin helical knife-edge element on one side of said driving means and the elongated cylindrical element on the other side of said driving means is provided with conventional threads on the exterior thereof.
Claim 8
Dependent Claim
34 words
A self-boring fastener for installation in a boreless workpiece as described in claim 3 wherein the cylindrical wall is externally beveled at its extremety so as to taper inwardly and form said longitudinal knife-edge.
Claim 9
Dependent Claim
34 words
A self-boring fastener for installation in a boreless workpiece as described in claim 3 wherein the cylindrical wall is internally beveled at its extremety so as to taper outwardly and form said longitudinal knife-edge.
Claim 10
Dependent Claim
44 words
A self-boring fastener for installation in a boreless workpiece as described in claim 3 wherein the cylindrical wall is externally and internally beveled so as to converge inwardly and outwardly thereby providing a knife-edge which is concentric with the mean thickness of said wall.
Claim 11
Dependent Claim
55 words
A self-boring fastener for installation in a boreless workpiece as described in claim 3 wherein the knife-edge formed is provided with longitudinal V-cuts whereby the trailing side of said V-cut upon the clockwise rotation of the fastener is vertical, and the lead side of said V-cut is slanted with respect to said vertical trailing edge.
Claim 12
Dependent Claim
28 words
A self-boring fastener for installation in a boreless workpiece as described in claim 3 wherein said driving means is a hexagonal flange normally extending from said cylindrical element.
Claim 13
Dependent Claim
33 words
A self-boring fastener for installation in a boreless workpiece as described in claim 5 wherein said driving means includes tool head means integral with and positioned at one extremety of said cylindrical element.
Claim 14
Independent Claim
176 words
A method of fastening wood, rubber and synthetic plastic materials to each other, without the use of prebored holes or mating metal parts embedded therein, which comprises the steps of: forming a self-boring fastener having an elongated cylindrical element, said cylindrical element having at one end thereof an open axial cavity formed by a continuous circumferential wall member and the opposite end thereof being closed whereby a compression chamber is defined therein; providing a thin continuous knife-edge element helically positioned about the outer periphery of said cylindrical element; forming a longitudinally extending knife-edge at the extremity of said open end of said cylindrical element; providing a driving means formed as an integral part of said element adjacent the closed end of said cylindrical element; temporarily positioning the materials in contact with each other; and rotatably embedding the self-boring fastener into and through the first material and into the second material rigidly permanently securing them together; and compressing the cutout materials against the walls of the axial cavity forming a core of reduced thickness in said chamber.
Claim 15
Independent Claim
176 words
A method of fastening wood, rubber and synthetic plastic materials to each other, without the use of prebored holes or mating metal parts embedded therein, which comprises the steps of: forming a self-boring fastener having an elongated cylindrical element, said cylindrical element having at one end thereof an open axial cavity formed by a continuous circumferential wall member and the opposite end thereof being closed whereby a compression chamber is defined therein; providing a thin continuous knife-edge element helically positioned about the outer periphery of said cylindrical element; forming a longitudinally extending knife-edge at the extremity of said open end of said cylindrical element; providing a driving means formed as an integral part of said element adjacent the closed end of said cylindrical element; temporarily positioning the materials in contact with each other; and rotatably embedding the self-boring fastener into and through the first material and into the second material rigidly permanently securing them together; and compressing the cutout materials against the walls of the axial cavity forming a core of reduced thickness in said chamber.
Claim 16
Dependent Claim
33 words
A method as recited in claim 13 wherein the steps include: creating a compression force within said chamber between the closed end of said cylindrical element and said materials disposed within said chamber.
Claim 17
Dependent Claim
34 words
A method as recited in claim 14 wherein the steps include: forcing said materials disposed in said chamber to expand laterally causing frictional interforce engagement between said materials and the walls of said chamber.
Claim 18
Independent Claim
200 words
A method of fastening wood, rubber or synthetic plastic materials to metallic or metallic hard substrates having prebored holes therein without the use of prebored matching holes in the softer materials or prepositioned mating metal parts embedded in the softer materials, wherein the method comprises the steps of: forming a self-boring fastener having an elongated cylindrical element, said cylindrical element having at one end an open axial cavity forming a continuous cylindrical wall member and the opposite end thereof being closed whereby a compression chamber is defined therein; providing a thin continuous knife-edge element helically positioned about the outer periphery of said cylindrical element; forming a longitudinally extending knife-edge at the extremity of said open end of said cylindrical element; positioning a driving means adjacent the closed end of said cylindrical element and integrally formed therewith; temporarily positioning the softer materials against the substrate; positioning the self-boring fastener into the prebored holes in the substrate, whereby said longitudinally extending knife edge contacts the softer materials; rotatably embedding said self-boring fastener into said softer material; compressing a core of said softer material within the axial cavity; and interconnecting said driving means of said self-boring fastener in rigid attachment to the substrate.
Claim 19
Independent Claim
200 words
A method of fastening wood, rubber or synthetic plastic materials to metallic or metallic hard substrates having prebored holes therein without the use of prebored matching holes in the softer materials or prepositioned mating metal parts embedded in the softer materials, wherein the method comprises the steps of: forming a self-boring fastener having an elongated cylindrical element, said cylindrical element having at one end an open axial cavity forming a continuous cylindrical wall member and the opposite end thereof being closed whereby a compression chamber is defined therein; providing a thin continuous knife-edge element helically positioned about the outer periphery of said cylindrical element; forming a longitudinally extending knife-edge at the extremity of said open end of said cylindrical element; positioning a driving means adjacent the closed end of said cylindrical element and integrally formed therewith; temporarily positioning the softer materials against the substrate; positioning the self-boring fastener into the prebored holes in the substrate, whereby said longitudinally extending knife edge contacts the softer materials; rotatably embedding said self-boring fastener into said softer material; compressing a core of said softer material within the axial cavity; and interconnecting said driving means of said self-boring fastener in rigid attachment to the substrate.
Claim 20
Dependent Claim
40 words
The method as recited in claim 16 wherein the steps include: providing a nut means adjacent said drive means for rigidly securing said softer material to said substrate, whereby said nut means projected outwardly of the holes in said substrate.
Claim 21
Dependent Claim
33 words
The method as recited in claim 17 wherein the steps include: creating a compression force within said chamber between the closed end of said cylindrical element and said material disposed within said chamber.
Claim 22
Dependent Claim
39 words
A method as recited in claim 18, wherein the steps include: forcing said softer material disposed in said chamber to expand laterally and compress axially causing frictional interface engagement between said softer material and the walls of the chamber.
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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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |