US3892099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for fastening of sandwich panels to supports
Assignee: Rolls Royce PLC
•
Filing: 1973-09-07
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Granted: 1975-07-01
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Expires: 1993-09-07
Abstract
Abstract A panel removably secured to a support by a fastener means, the panel consisting of a first and a second skin of a material reinforced by fibers, on either side of a cellular core, with a hole through the first skin and the core and a smaller concentric hole through the second skin, reinforced by a flat annulus bonded to the other face of the second skin around the smaller hole, and by an insert consisting of a tubular portion lining the hole in the core, an external flange bonded to the outer face of the first skin, and an internal flange bonded to the inner face of the second skin around the smaller hole, the annular engaging the support, and the fastener means including a shank passing through the holes in the internal flange, the second skin, and the annulus into the support, and a portion having a clamping face engaging the internal flange and exerting a clamping force on the internal flange, second skin, and annulus against the support, the said portion having radial clearance within the tubular portion.
Inventors
- 👤 Gordon Peter Worgan
- 👤 Gordon John Lane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:19
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/10; E04C2/20; F; F16; F16B; F16B5/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
209 words
A panel removably secured to a support by a fastener means; the panel comprising a first and a second skin of a material reinforced by fibers, on either side of a cellular core, with a hole through the first skin and the core and a smaller concentric hole through the second skin, reinforced by a flat annulus adhesively bonded to the outer face of the second skin around the smaller hole, and by an insert comprising a hollow tubular portion extending axially into and lining the hole in the core, an external flange at one end of the tubular portion and adhesively bonded to the outer face of the first skin, and a radially inwardly extending internal flange at the other end of the tubular portion and adhesively bonded to the inner face of the second skin around the smaller hole; the annulus engaging the support; and the fastener means including a shank passing through the holes in the internal flange, the second skin, and the annulus into the support, and a head portion having a clamping face within said hollow tubular portion exerting a clamping force on the internal flange, second skin, and annular against the support, the said head portion having radial clearance within the tubular portion.
Claim 2
Dependent Claim
209 words
A panel removably secured to a support by a fastener means; the panel comprising a first and a second skin of a material reinforced by fibers, on either side of a cellular core, with a hole through the first skin and the core and a smaller concentric hole through the second skin, reinforced by a flat annulus adhesively bonded to the outer face of the second skin around the smaller hole, and by an insert comprising a hollow tubular portion extending axially into and lining the hole in the core, an external flange at one end of the tubular portion and adhesively bonded to the outer face of the first skin, and a radially inwardly extending internal flange at the other end of the tubular portion and adhesively bonded to the inner face of the second skin around the smaller hole; the annulus engaging the support; and the fastener means including a shank passing through the holes in the internal flange, the second skin, and the annulus into the support, and a head portion having a clamping face within said hollow tubular portion exerting a clamping force on the internal flange, second skin, and annular against the support, the said head portion having radial clearance within the tubular portion.
Claim 3
Dependent Claim
18 words
Apparatus as claimed in claim 1 wherein said fibers have a low value of strain at breaking point.
Claim 4
Dependent Claim
13 words
Apparatus as claimed in claim 2 wherein said skins are of plastics material.
Claim 5
Dependent Claim
12 words
Apparatus as claimed in claim 3 wherein said fibers are carbon fibers.
Claim 6
Dependent Claim
15 words
Apparatus as claimed in claim 4 wherein said skins are of epoxy or phenolic resin.
Claim 7
Dependent Claim
12 words
Apparatus as claimed in claim 2 wherein said fibers are boron fibers.
Claim 8
Dependent Claim
23 words
Apparatus as claimed in claim 1 wherein said annulus is of a diameter substantially larger than any radial dimension of said tubular portion.
Claim 9
Dependent Claim
19 words
Apparatus as claimed in claim 7 wherein said annulus is of a diameter approximately equal to said external flange.
Claim 10
Dependent Claim
28 words
Apparatus as claimed in claim 1 wherein said head portion is radially enlarged relative to said shank and said smaller hole and is recessed within said tubular portion.
Claim 11
Dependent Claim
25 words
Apparatus as claimed in claim 9 wherein said head portion is formed for engagement by a rotary driving tool from the side opposite said support.
Claim 12
Dependent Claim
18 words
Apparatus as claimed in claim 10 wherein said shank is unthreaded where it passes through said internal flange.
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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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |