US4519243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the nondestructive testing of elongated test specimens by magnetic techniques
Assignee: Institut Dr Friedrich Foerster Pruefgeraetebau GmbH and Co KG
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Filing: 1983-03-10
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Granted: 1985-05-28
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Expires: 2003-03-10
Abstract
Abstract The devices for holding down a speciman to be tested are arranged on the e side of the tube as the transducer, without the tube movement being obstructed. The holding down devices may be arranged directly opposite to the rotation devices, or optionally in the immediate neighborhood thereof. Bending of the tube due to the holding devices does not occur even where relatively large pressing forces are used.
Inventors
- 👤 Wolfgang Trautmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:30
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9013
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
173 words
Testing apparatus for elongated test specimens having an essentially circular cross-section, said apparatus having rollers supporting a test specimen from below and at least one of which being driven for rotating the test specimen about its central longitudinal axis, a transducer system for non-destructive testing of the test specimen including a transducer arrangement, a guiding arrangement to which the transducer arrangement is suspended, the structure of said guiding arrangement presetting a course or testing track along the test specimen in its longitudinal direction, means for moving the transducer arrangement in its course, and vertical positionable means for pressing the test specimens in its lowered condition onto the rollers, comprising: a plurality of pressing means arranged movably in a direction longitudinally of the test specimen, each said pressing means located immediately adjacent the guiding arrangement, at least one before and one behind the transducer system, and means for selectively and releasably coupling each of the pressing means to the transducer system such that the pressing means moves unitarily with the transducer system when so-coupled.
Claim 2
Dependent Claim
173 words
Testing apparatus for elongated test specimens having an essentially circular cross-section, said apparatus having rollers supporting a test specimen from below and at least one of which being driven for rotating the test specimen about its central longitudinal axis, a transducer system for non-destructive testing of the test specimen including a transducer arrangement, a guiding arrangement to which the transducer arrangement is suspended, the structure of said guiding arrangement presetting a course or testing track along the test specimen in its longitudinal direction, means for moving the transducer arrangement in its course, and vertical positionable means for pressing the test specimens in its lowered condition onto the rollers, comprising: a plurality of pressing means arranged movably in a direction longitudinally of the test specimen, each said pressing means located immediately adjacent the guiding arrangement, at least one before and one behind the transducer system, and means for selectively and releasably coupling each of the pressing means to the transducer system such that the pressing means moves unitarily with the transducer system when so-coupled.
Claim 3
Dependent Claim
89 words
Testing apparatus as in claim 1, in which upon the transducer system moving forward, a first pressing means is coupled to the rear of the transducer system and is lifted upwardly away from the test specimen, while simultaneously a second pressing means is deposited onto the test specimen at a predetermined roller, and after the transducer system arrives at the predetermined roller, the first pressing means is decoupled and lowered, and the second pressing means is lifted and coupled to the front of the transducer system for movement therewith.
Claim 4
Dependent Claim
53 words
Testing apparatus as in claim 2, in which the transducer system together with the two pressing means ccontinues its course until the first pressing means arrives at the predetermined roller locating at which time decoupling and lowering of the first pressing means to the test specimen occurs, while the transducer system moves on.
Claim 5
Dependent Claim
39 words
Testing devices as in claim 3, in which the transducer system exerts a pressure on the test specimen and while the first and second pressing means are in lifted up condition the test specimen presses onto the driven roller.
Claim 6
Dependent Claim
21 words
Testing device as in claim 4, in which the pressure exerted on the test specimen by the transducer system is adjustable.
Claim 7
Dependent Claim
53 words
Testing device as in either of claims 2 or 3, in which a return of the transducer system takes place in an opposite direction to the moving forward, during which lifting, lowering, decoupling, and coupling of the pressing means occur in reversed order to the order in which they occurred during forward movement.
Claim 8
Dependent Claim
34 words
Testing device as in either of claims 2 or 3, in which a braking device is provided for each pressing means for holding stationary when activated the blocking means for which it was provided.
Claim 9
Dependent Claim
34 words
Testing device as in either of claims 2 or 3, in which detection devices are arranged along the test course for detecting the locations of the pressing means and transducer system for controlling operation.
References Cited (Backward Citations)
US3263809A
Cited
US3894425A
Cited
US4258319A
Cited
JPS54111881A
Cited
JPS55113951A
Cited
FR2489502A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |