US3713753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber reinforced plastic laminate construction of an airfoil wing type member
Assignee: Airbus Defence and Space GmbH
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Filing: 1969-08-05
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Granted: 1973-01-30
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Expires: 1989-08-05
Abstract
Abstract A laminate construction for an airfoil wing type member, such as a helicopter rotor blade, is produced by machine winding multiple layers of reinforcing fiber about a foil-like material support layer on a rotatable mandrel. The laminate construction is cut from the mandrel and shaped to the desired configuration in a mold cavity with the addition of a hardenable resin filler material. In adjacent layers the fibers are wound to form a diamond shaped pattern. The pitch angles of the fibers in different layers can be varied to accommodate different conditions, and, in addition, the length of the wound layers along the mandrel can be varied as required.
Inventors
- 👤 K Brunsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:30
CPC Classifications
B; B29; B29D; B29D99/00; B29D99/0025; B29D99/0028; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/60; B29C69/00; B29C69/001; B29C69/002; B29C69/003; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/34; B29C70/347; B29C70/40; B29C70/42; B29C70/44; B29C70/446; B29C70/54; B29C70/545; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473; B29C43/00; B29C43/02; B29C43/10; B29C43/12; B29K; B29K2305/00; B29K2309/00; B29K2309/08; B29L; B29L2031/00; B29L2031/08; B29L2031/082; B64C2027/4733; B64C2027/4736; Y; Y02; Y02T; Y02T50/00; Y02T50/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
A laminate structure for forming the shell of an airfoil wing type member comprising a support layer formed of a foil-like material, a resin impregnated webbing formed on said support layer, said webbing comprising a plurality of superposed layers of machine wound fibers, said fibers in each said layer having the same winding angle and disposed in laterally spaced relationship to one another, in adjacent said layers in which said fibers have the same winding angle the winding angle is reversed for forming a diamond shaped winding pattern by means of the adjacent layers, and said webbing having at least two groups of said layers with the layers in each said group having a winding angle which is different from the winding angle of the other said group.
Claim 2
Dependent Claim
128 words
A laminate structure for forming the shell of an airfoil wing type member comprising a support layer formed of a foil-like material, a resin impregnated webbing formed on said support layer, said webbing comprising a plurality of superposed layers of machine wound fibers, said fibers in each said layer having the same winding angle and disposed in laterally spaced relationship to one another, in adjacent said layers in which said fibers have the same winding angle the winding angle is reversed for forming a diamond shaped winding pattern by means of the adjacent layers, and said webbing having at least two groups of said layers with the layers in each said group having a winding angle which is different from the winding angle of the other said group.
Claim 3
Dependent Claim
128 words
A laminate structure for forming the shell of an airfoil wing type member comprising a support layer formed of a foil-like material, a resin impregnated webbing formed on said support layer, said webbing comprising a plurality of superposed layers of machine wound fibers, said fibers in each said layer having the same winding angle and disposed in laterally spaced relationship to one another, in adjacent said layers in which said fibers have the same winding angle the winding angle is reversed for forming a diamond shaped winding pattern by means of the adjacent layers, and said webbing having at least two groups of said layers with the layers in each said group having a winding angle which is different from the winding angle of the other said group.
Claim 4
Dependent Claim
128 words
A laminate structure for forming the shell of an airfoil wing type member comprising a support layer formed of a foil-like material, a resin impregnated webbing formed on said support layer, said webbing comprising a plurality of superposed layers of machine wound fibers, said fibers in each said layer having the same winding angle and disposed in laterally spaced relationship to one another, in adjacent said layers in which said fibers have the same winding angle the winding angle is reversed for forming a diamond shaped winding pattern by means of the adjacent layers, and said webbing having at least two groups of said layers with the layers in each said group having a winding angle which is different from the winding angle of the other said group.
Claim 5
Dependent Claim
271 words
An airfoil wing type member comprising a longitudinally extending tubular shaped spar support having an oval shaped transverse section and comprising an inner layer formed of a foil-like material and an outer layer of resin impregnated fibers machine wound in a laterally spaced manner into a multiplicity of superposed layers with the fibers disposed at a pitch angle arranged obliquely to longitudinal axis of said support, said layers arranged in a number of superposed groups with said layers in each group having the same winding angle which is different from the winding angle of the other groups, adjacent said layers in each of said groups having the direction of the winding angle reversed for providing a diamond shaped winding pattern by means of the adjacent layers, a junction member integrally secured to one end of said spar support and comprising a transition section extending axially from said spar support and terminating in a hemispherically shaped section located at the end of said transition section remote from said support, said transition section having an oval shaped cross section at its connection to said support and the cross section being changed to a circular one at its end integrally secured to said hemispherically shaped section, said junction member comprising a hardened laminate structure comprising an inner foil-like layer and a multiplicity of machine wound fibers about said foil-like layer for the length of said transition and hemispherically shaped sections, said hemispherically shaped section having an aperture centrally arranged therein and said fibers being wound in said hemispherically shaped section to provide a toroidally shaped thickened edge defining the periphery of the aperture therethrough.
Claim 6
Dependent Claim
271 words
An airfoil wing type member comprising a longitudinally extending tubular shaped spar support having an oval shaped transverse section and comprising an inner layer formed of a foil-like material and an outer layer of resin impregnated fibers machine wound in a laterally spaced manner into a multiplicity of superposed layers with the fibers disposed at a pitch angle arranged obliquely to longitudinal axis of said support, said layers arranged in a number of superposed groups with said layers in each group having the same winding angle which is different from the winding angle of the other groups, adjacent said layers in each of said groups having the direction of the winding angle reversed for providing a diamond shaped winding pattern by means of the adjacent layers, a junction member integrally secured to one end of said spar support and comprising a transition section extending axially from said spar support and terminating in a hemispherically shaped section located at the end of said transition section remote from said support, said transition section having an oval shaped cross section at its connection to said support and the cross section being changed to a circular one at its end integrally secured to said hemispherically shaped section, said junction member comprising a hardened laminate structure comprising an inner foil-like layer and a multiplicity of machine wound fibers about said foil-like layer for the length of said transition and hemispherically shaped sections, said hemispherically shaped section having an aperture centrally arranged therein and said fibers being wound in said hemispherically shaped section to provide a toroidally shaped thickened edge defining the periphery of the aperture therethrough.
Claim 7
Dependent Claim
51 words
An airfoil wing type member, as set forth in claim 2, comprising an anchor member inserted into said hemispherically shaped section of said junction member through the aperture therein, a support ring disposed about said anchor member exteriorly of said junction member and securing said anchor member to said junction member.
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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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |