US3886665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monitoring apparatus
Assignee: John Laing and Son Ltd
•
Filing: 1973-04-24
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Granted: 1975-06-03
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Expires: 1993-04-24
Abstract
Abstract A monitoring apparatus for measuring the varying radii of curvature along the axis of a bore which may comprise the internal surface of a pipe, or a borehole formed in rock. The apparatus comprises an elongated body member having a roller assembly articulatedly mounted at each end adapted to accurately position the axis of the body member relative to the bore or member, the roller assemblies being spaced a predetermined distance from one another to define a chord length. Measuring means are positioned relatively to the body member for indicating the length of the offset over the chord length referred to above and then this figure is related by tables or calculation to the associated radius of curvature.
Inventors
- 👤 Michael David Lowen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:13
CPC Classifications
G; G01; G01B; G01B7/00; G01B7/28; G01B7/281
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
171 words
A monitoring apparatus for measuring varying radii of curvature along an axis of a bore, said apparatus comprising an elongated rigid body member for traversing within the bore, said body member having a longitudinal axis; a pair of supporting assemblies spaced a predetermined distance from each other to define a chord along said axis of said body member, each said support assembly being universally mounted at a respective end of said body member and having at least three elements urged outwardly to engage an inner surface of the bore to accurately position said axis of said body member relative to the bore; a carriage mounted for radial movement relative to said body member, said carriage including means engaging said inner surface of the bore for centering said carriage with respect thereto; and measuring means mounted on said carriage for indicating radial displacements of said carriage relative to said body member to determine the distance between said chord and the inner surface of bore taken on a line normal to said chord.
Claim 2
Dependent Claim
171 words
A monitoring apparatus for measuring varying radii of curvature along an axis of a bore, said apparatus comprising an elongated rigid body member for traversing within the bore, said body member having a longitudinal axis; a pair of supporting assemblies spaced a predetermined distance from each other to define a chord along said axis of said body member, each said support assembly being universally mounted at a respective end of said body member and having at least three elements urged outwardly to engage an inner surface of the bore to accurately position said axis of said body member relative to the bore; a carriage mounted for radial movement relative to said body member, said carriage including means engaging said inner surface of the bore for centering said carriage with respect thereto; and measuring means mounted on said carriage for indicating radial displacements of said carriage relative to said body member to determine the distance between said chord and the inner surface of bore taken on a line normal to said chord.
Claim 3
Dependent Claim
171 words
A monitoring apparatus for measuring varying radii of curvature along an axis of a bore, said apparatus comprising an elongated rigid body member for traversing within the bore, said body member having a longitudinal axis; a pair of supporting assemblies spaced a predetermined distance from each other to define a chord along said axis of said body member, each said support assembly being universally mounted at a respective end of said body member and having at least three elements urged outwardly to engage an inner surface of the bore to accurately position said axis of said body member relative to the bore; a carriage mounted for radial movement relative to said body member, said carriage including means engaging said inner surface of the bore for centering said carriage with respect thereto; and measuring means mounted on said carriage for indicating radial displacements of said carriage relative to said body member to determine the distance between said chord and the inner surface of bore taken on a line normal to said chord.
Claim 4
Dependent Claim
171 words
A monitoring apparatus for measuring varying radii of curvature along an axis of a bore, said apparatus comprising an elongated rigid body member for traversing within the bore, said body member having a longitudinal axis; a pair of supporting assemblies spaced a predetermined distance from each other to define a chord along said axis of said body member, each said support assembly being universally mounted at a respective end of said body member and having at least three elements urged outwardly to engage an inner surface of the bore to accurately position said axis of said body member relative to the bore; a carriage mounted for radial movement relative to said body member, said carriage including means engaging said inner surface of the bore for centering said carriage with respect thereto; and measuring means mounted on said carriage for indicating radial displacements of said carriage relative to said body member to determine the distance between said chord and the inner surface of bore taken on a line normal to said chord.
Claim 5
Dependent Claim
17 words
A monitoring apparatus as claimed in claim 1 wherein said carriage is positioned within said body member.
Claim 6
Dependent Claim
25 words
A monitoring apparatus as claimed in claim 1 wherein said measuring means comprises two transducers mounted on said carriage at right angles to each other.
Claim 7
Dependent Claim
38 words
A monitoring apparatus as claimed in claim 3 wherein said body member has a reference ring fixedly mounted thereon and each transducer has a sensor member urged outwardly into engagement with an inner surface of said reference ring.
Claim 8
Dependent Claim
41 words
A monitoring apparatus as claimed in claim 1 wherein said centering means comprises spaced roller assemblies each having rollers spring-urged outwardly through slots formed in said body member to coincide the center of said carriage with the axis of the bore.
Claim 9
Dependent Claim
34 words
A monitoring apparatus as claimed in claim 1 wherein said carriage includes abutment means slidably engaging a slotted bulkhead in said body member to prevent rotation of said carriage relative to said body member.
Claim 10
Dependent Claim
16 words
A monitoring apparatus as claimed in claim 1 wherein each supporting assembly comprises a roller assembly.
Claim 11
Dependent Claim
26 words
A monitoring apparatus as claimed in claim 7 which includes a self-aligning bearing mounting each respective roller assembly on a respective end of said body member.
Claim 12
Dependent Claim
32 words
A monitoring apparatus as claimed in claim 1 which includes ballast means mounted in said body member for maintaining said body member in a predetermined position relative to the bore being measured.
Claim 13
Dependent Claim
35 words
A monitoring apparatus as claim in claim 1 which further comprises means including a gyroscopic unit and potentiometer mounted in said body member for determining an angular position of the apparatus in a vertical bore.
References Cited (Backward Citations)
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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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |