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US4414011A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of securing fiber reinforced glass matrix composite material to structural members

Assignee: RTX Corp
•
Filing: 1982-05-25
•
Granted: 1983-11-08
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Expires: 2002-05-25
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Abstract

Abstract A method of securing fiber reinforced glass matrix composite material to structural members is disclosed. Two materials to be secured together are provided with a hole or other opening for insert of the fastening means. A fastening means, preferably a rivet or bolt is provided by hot pressing glass matrix material in and around unidirectionally oriented continuous length silicon carbide fibers. Such material is coined and optionally provided with threading. After formation, the bolt or rivet is inserted into the opening provided to attach the materials together and the open end of the rivet or bolt closed either by nut means or by heat deforming. The resultant secured composite-structural member remains inseparable in use, for example, in an environment of extreme temperature fluctuation. The structural member can also be fiber reinforced glass composite material, metal, unreinforced ceramic or other high temperature composite. The rivet or bolt is formed by hot-press forming a fiber reinforced composite material, slicing longitudinal rectangular sections from the composite and coining the longitudinal sections. Heads are also coined on the longitudinal sections thus formed. For the bolt embodiment, threads are also machined on the coined part.

Inventors

  • 👤 George K. Layden
  • 👤 Karl M. Prewo

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 22:13
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/56; B29C65/60; B29C65/601; B29C66/00; B29C66/70; B29C66/72; B29C66/721; B29C66/7212; F; F16; F16B; F16B33/00; F16B33/006; B29C66/7214; B29C66/72141; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/10; B29K2105/101

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 98 words
A method of securing fiber reinforced glass matrix composite material to a structural member comprising molding and machining a high temperature stable fiber reinforced glass matrix composite material into rivet or bolt form, forming substantially concentric holes in the composite material and structural member at the point of attachment, securing the composite material to the structural member by inserting the rivet or bolt through such holes and closing the open end of the rivet or bolt by heat deforming or nut means respectively, so as to produce a composite material-structural member which remains secure under extreme temperature fluctuations.
Claim 2
Independent Claim 98 words
A method of securing fiber reinforced glass matrix composite material to a structural member comprising molding and machining a high temperature stable fiber reinforced glass matrix composite material into rivet or bolt form, forming substantially concentric holes in the composite material and structural member at the point of attachment, securing the composite material to the structural member by inserting the rivet or bolt through such holes and closing the open end of the rivet or bolt by heat deforming or nut means respectively, so as to produce a composite material-structural member which remains secure under extreme temperature fluctuations.
Claim 3
Dependent Claim 17 words
The method of claim 1 wherein the structural member is silicon carbide fiber reinforced glass matrix material.
Claim 4
Dependent Claim 11 words
The method of claim 1 wherein the structural member is metal.
Claim 5
Dependent Claim 15 words
The method of claim 1 wherein the structural member is unreinforced ceramic, glass or glass-ceramic.
Claim 6
Dependent Claim 17 words
The method of claim 1 wherein the high temperature stable fibers are silicon carbide, graphite or alumina.
Claim 7
Independent Claim 88 words
A method of making a fiber reinforced glass matrix composite rivet or a bolt comprising hot pressing a mixture of glass matrix material containing about 20% to about 60% by volume high temperature stable fibers to form a sheet of high temperature stable, fiber reinforced composite material, cutting the sheet into bars of substantially square cross section, heating the cut bars in a mold to deform the bars into bars of substantially circular cross section, heating one end of the deformed bars to form a flat head section.
Claim 8
Independent Claim 88 words
A method of making a fiber reinforced glass matrix composite rivet or a bolt comprising hot pressing a mixture of glass matrix material containing about 20% to about 60% by volume high temperature stable fibers to form a sheet of high temperature stable, fiber reinforced composite material, cutting the sheet into bars of substantially square cross section, heating the cut bars in a mold to deform the bars into bars of substantially circular cross section, heating one end of the deformed bars to form a flat head section.
Claim 9
Dependent Claim 20 words
The method of claim 6 including coining threads on the bars during or after forming the substantially circular cross section.
Claim 10
Dependent Claim 15 words
The method of claim 6 including machining threads on the bars of cylindrical cross section.
Claim 11
Dependent Claim 15 words
The method of claim 6 wherein the reinforcing fibers are silicon carbide, graphite, or alumina.
Claim 12
Dependent Claim 21 words
The method of claim 6 wherein the matrix material is borosilicate, aluminosilicate, high silica content glass, or lithium aluminosilicate glass ceramic.

References Cited (Backward Citations)

US3681187A Cited
US4047993A Cited
US4103063A Cited
US4324843A Cited
US4314852A Cited
US4357286A Cited
US4370390A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-11-07 1987-05-09 1987-11-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-11-07 1991-05-09 1991-11-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-11-07 1995-05-09 1995-11-08 $7700.00 Window Closed / Lapsed

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