US3966523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making filament reinforced composite rings from plural flat filamentary spiral layers
Assignee: RTX Corp
•
Filing: 1975-08-11
•
Granted: 1976-06-29
•
Expires: 1995-08-11
Abstract
Abstract Methods for forming a composite ring having unidirectional filaments embedded in a polymer matrix is disclosed. The filaments are spirally wound within the ring to form a plurality of essentially circular hoops which are in coaxial alignment with the expected lines of principle force. In one embodiment the formed ring is structurally integrated into the rotor of a gas turbine engine to reinforce the rotor and to restrain the rotor blades which extend outwardly of the ring.
Inventors
- 👤 Karl Severin Jakobsen
- 👤 David Benjamin McLaughlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:11
CPC Classifications
B; B29; B29D; B29D22/00; B29K; B29K2105/00; B29K2105/06; Y; Y10; Y10S; Y10S264/00; Y10S264/57; Y10S264/59
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
95 words
The method of making a composite ring having a plurality of undirectional filaments embedded in a polymer matrix comprising: winding a filament into a solvated curable polymer matrix containing curing agents to form a monolayer sheet comprising a filamentary flat spiral; desolvating the polymer matrix of the monolayer sheet to hold the filament in position in the sheet; stacking a plurality of the monolayer sheeets in adjacent relationship in an annular mold cavity; and curing the polymer matrix in the stacked monolayer sheets under pressure in said mold cavity to form a unitary composite ring.
Claim 2
Independent Claim
95 words
The method of making a composite ring having a plurality of undirectional filaments embedded in a polymer matrix comprising: winding a filament into a solvated curable polymer matrix containing curing agents to form a monolayer sheet comprising a filamentary flat spiral; desolvating the polymer matrix of the monolayer sheet to hold the filament in position in the sheet; stacking a plurality of the monolayer sheeets in adjacent relationship in an annular mold cavity; and curing the polymer matrix in the stacked monolayer sheets under pressure in said mold cavity to form a unitary composite ring.
Claim 3
Dependent Claim
29 words
The method according to claim 1 wherein the filament is comprised of a material selected from the group consisting of boron, carbon, silicon and boron carbides, and aluminum oxide.
Claim 4
Dependent Claim
29 words
The method according to claim 1 wherein separation papers are placed along the sides of the groove in the mandril prior to the step of winding the filament therein.
Claim 5
Dependent Claim
23 words
The method according to claim 1 wherein the polymer matrix is a material selected from the group consisting of epoxys, nylon, polybenzimidzole resins.
Claim 6
Dependent Claim
14 words
The method according to claim 1 wherein the polymer matrix is a polyimide resin.
Claim 7
Dependent Claim
37 words
The method according to claim 1 wherein the step of curing the polymer matrix includes subjecting the matrix to a pressure to approximately 350 psi to fully integrate the matrix material and form a unitized composite ring.
Claim 8
Dependent Claim
39 words
The method of claim 1 wherein the monolayer sheet is formed by winding the filament into an outwardly facing peripheral groove of a mandril and wherein the polymer matrix is introduced into the groove during the filament winding step.
Claim 9
Dependent Claim
27 words
The method according to claim 7 wherein the groove of the mandril has a width which is approximately 120% of the diameter of the filament wound therein.
Claim 10
Dependent Claim
36 words
The method of claim 1 including after the stacking step, the further step of heating the stacked monolayer sheets to drive off substantially all solvent and a portion of the curing agents from the polymer matrix.
Claim 11
Dependent Claim
19 words
The method according to claim 9 wherein the heating step is accomplished at an elevated temperature of approximately 390°F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |