US3690775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Borescope fixture
Assignee: Avco Corp
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Filing: 1971-09-01
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Granted: 1972-09-12
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Expires: 1991-09-01
Abstract
Abstract A fixture to permit use of a flexible borescope to inspect inaccessible recesses of engines is disclosed. The borescope fixture is adapted to be fitted into an existing threaded hole of the engine. A semi-rigid tube is shaped to reach from the hole in the engine casing to the engine location of interest so as to permit the flexible borescope to reach such location for visual inspection thereof.
Inventors
- 👤 Nicholas T Cousins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:24
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/24; G02B23/2476; G02B6/00; G02B6/44; G02B6/4401; G02B6/4415; G02B6/4427; G02B6/4428
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
156 words
A borescope fixture for supporting and guiding a flexible borescope having a lens end to a desired location within an engine casing for visual inspection of that location comprising: an externally threaded cylindrical member for insertion into threaded engine port, said member having a bore therethrough, one end of the bore being chamfered; borescope guide means extending through the bore for receiving a flexible borescope therethrough and guiding the lens end of the borescope to the desired inspection location, said means having one end shaped to conform with said chamfered end of said cylindrical member; an internally threaded nut for threadably engaging one end of said cylindrical member, said nut having a chamfered portion for engaginG the formed end of said guide means and urging said formed end against the chamfered portion of said cylindrical member to locate said guide means therebetween; and a locking nut for locking said cylindrical member relative to the engine casing.
Claim 2
Dependent Claim
156 words
A borescope fixture for supporting and guiding a flexible borescope having a lens end to a desired location within an engine casing for visual inspection of that location comprising: an externally threaded cylindrical member for insertion into threaded engine port, said member having a bore therethrough, one end of the bore being chamfered; borescope guide means extending through the bore for receiving a flexible borescope therethrough and guiding the lens end of the borescope to the desired inspection location, said means having one end shaped to conform with said chamfered end of said cylindrical member; an internally threaded nut for threadably engaging one end of said cylindrical member, said nut having a chamfered portion for engaginG the formed end of said guide means and urging said formed end against the chamfered portion of said cylindrical member to locate said guide means therebetween; and a locking nut for locking said cylindrical member relative to the engine casing.
Claim 3
Dependent Claim
39 words
The fixture as set forth in claim 1 in which said borescope guide means is a semi-rigid tube and further comprising a handle on said cylindrical member for permitting rotation of said cylindrical member relative to the engine casing.
Claim 4
Dependent Claim
45 words
The fixture as set forth in claim 2 in which said tube is plastic and in which said internally threaded nut includes an axially extending projection for engagement with a portion of the borescope to limit the movement of the borescope through the borescope fixture.
References Cited (Backward Citations)
US3434775A
Cited
US3519363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |