US3799693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bullet nose fastening arrangement
Assignee: General Electric Co
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Filing: 1972-11-06
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Granted: 1974-03-26
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Expires: 1992-11-06
Abstract
Abstract An arrangement for detachably fastening a bullet nose to the forward end of an aircraft engine is provided in a manner which positively precludes the possibility of one of the bullet nose fastening bolts from loosening and entering the engine inlet airstream.
Inventors
- 👤 P Hull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:00
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/02; B64C11/14; F; F02; F02C; F02C7/00; F02C7/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
Means for fastening a bullet nose to an engine comprising: a plurality of retaining bolts having a threaded portion and a head portion of larger diameter than the threaded portion with each head portion including a socket recessed therein for receipt of a tightening tool; means circumferentially spaced around the engine for threadably engaging the retaininng bolts; and a peripheral flange extending inwardly from the edge of the bullet nose and having a plurality of keyhole slots therethrough circumferentially spaced around the flange in substantial coaxial alignment with the bolt engaging means, wherein the bullet nose includes a plurality of circumferentially spaced openings therethrough in substantial coaxial alignment with the keyhole slots and the bolt engaging means and wherein each hole is sized to preclude the passage of a retaining bolt therethrough while permitting intrusion of the tightening tool.
Claim 2
Dependent Claim
139 words
Means for fastening a bullet nose to an engine comprising: a plurality of retaining bolts having a threaded portion and a head portion of larger diameter than the threaded portion with each head portion including a socket recessed therein for receipt of a tightening tool; means circumferentially spaced around the engine for threadably engaging the retaininng bolts; and a peripheral flange extending inwardly from the edge of the bullet nose and having a plurality of keyhole slots therethrough circumferentially spaced around the flange in substantial coaxial alignment with the bolt engaging means, wherein the bullet nose includes a plurality of circumferentially spaced openings therethrough in substantial coaxial alignment with the keyhole slots and the bolt engaging means and wherein each hole is sized to preclude the passage of a retaining bolt therethrough while permitting intrusion of the tightening tool.
Claim 3
Dependent Claim
60 words
The fastening means of claim 1 wherein: the large diameter portions of the keyhole slots are of sufficient size to permit passage of the head portions of each bolt therethrough and the small diameter portions of the keyhole slots are sized to permit passage of the threaded portions of each bolt therethrough while engaging the head portions of each bolt.
Claim 4
Dependent Claim
165 words
In a gas turbine engine, means for fastening a bullet nose to an inner fairing of an aircraft engine comprising: a plurality of retaining bolts having a threaded portion and a head portion of larger diameter than the threaded portion with each head portion including a socket recessed therein for receipt of a tightening tool; a first peripheral flange extending inwardly from the edge of the fairing and having means circumferentially spaced around the flange for threadably engaging the retaining bolts; and a second peripheral flange extending inwardly From the edge of the bullet nose and having a plurality of keyhole slots therethrough circumferentially spaced around the second flange in substantial coaxial alignment with the bolt engaging means wherein the bullet nose includes a plurality of circumferentially spaced openings therethrough in substantial coaxial alignment with the keyhole slots and the bolt engaging means, and wherein each hole is sized to preclude the passage of a retaining bolt therethrough while permitting intrusion of a tightening tool.
Claim 5
Dependent Claim
165 words
In a gas turbine engine, means for fastening a bullet nose to an inner fairing of an aircraft engine comprising: a plurality of retaining bolts having a threaded portion and a head portion of larger diameter than the threaded portion with each head portion including a socket recessed therein for receipt of a tightening tool; a first peripheral flange extending inwardly from the edge of the fairing and having means circumferentially spaced around the flange for threadably engaging the retaining bolts; and a second peripheral flange extending inwardly From the edge of the bullet nose and having a plurality of keyhole slots therethrough circumferentially spaced around the second flange in substantial coaxial alignment with the bolt engaging means wherein the bullet nose includes a plurality of circumferentially spaced openings therethrough in substantial coaxial alignment with the keyhole slots and the bolt engaging means, and wherein each hole is sized to preclude the passage of a retaining bolt therethrough while permitting intrusion of a tightening tool.
Claim 6
Dependent Claim
60 words
The fastening means of claim 3 wherein the large diameter portions of the keyhole slots are of sufficient size to permit passage of the head portions of each bolt therethrough and the small diameter portions of the keyhole slots are sized to permit passage of the threaded portions of each bolt therethrough while engaging the head portions of each bolt.
Claim 7
Dependent Claim
44 words
The fastening means of claim 4 wherein the bolt engaging means include a plurality of holes through the first peripheral flange, each hole of which is in substantial alignment with a nut attached to the first peripheral flange for threadably engaging a retaining bolt.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |