Patent US4602512A successfully refreshed from Google Patents.
US4602512A
Expired / Lapsed
US
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Electro-dynamic transducer
Assignee: Nukem GmbH
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Filing: 1985-04-12
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Granted: 1986-07-29
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Expires: 2005-04-12
Abstract
Abstract An electro-dynamic transducer head (107) coming into contact with a workpiece (14) comprises a protective cap (28, 38), which is at least partially surrounded by a sliding protection element (22). The sliding protective element has a basic member (24) with sections (26), which are introduced into recesses (28) by deposit welding.
Inventors
- 👤 Ewald Kowol
- 👤 Dieter Zwanzig
- 👤 Hans J. Jehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:39
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/24; G01N29/2412; G01H; G01H11/00; G01H11/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
151 words
Electro-dynamic transducer for non-destructive testing of workpieces by means of ultra-sonics using a magnet with a magnet yoke with external pole shoe surrounding a conically tapered inner pole shoe, preferably tapering towards the workpiece and equipped in the region of its free face opposite to the workpiece with exciter and receiver coils, which in turn are provided with a cover at least on the side facing the workpiece, characterized in that, the cover encompasses a protective cap (20, 38) spaced from the exciter and receiver coil and covering it, this protective cap in turn is at least partially surrounded by a sliding protection element (22) whereby the said sliding protection element has a basic member (24) with sections (26) which come into contact with the workpiece (14); these sections are introduced into recesses (28) in the basic member by deposit welding, and are formed by metal particles fused into a matrix.
Claim 2
Dependent Claim
151 words
Electro-dynamic transducer for non-destructive testing of workpieces by means of ultra-sonics using a magnet with a magnet yoke with external pole shoe surrounding a conically tapered inner pole shoe, preferably tapering towards the workpiece and equipped in the region of its free face opposite to the workpiece with exciter and receiver coils, which in turn are provided with a cover at least on the side facing the workpiece, characterized in that, the cover encompasses a protective cap (20, 38) spaced from the exciter and receiver coil and covering it, this protective cap in turn is at least partially surrounded by a sliding protection element (22) whereby the said sliding protection element has a basic member (24) with sections (26) which come into contact with the workpiece (14); these sections are introduced into recesses (28) in the basic member by deposit welding, and are formed by metal particles fused into a matrix.
Claim 3
Dependent Claim
32 words
According to claim 1, characterized in that, sections (26) formed by deposit welding project at least in parts relative to that face of the basic member (24) turned towards the workpiece (14).
Claim 4
Dependent Claim
21 words
According to claim 1, characterized in that, the matrix consists of carbon steel and the metal particles are of hard alloy.
Claim 5
Dependent Claim
27 words
According to claim 3, characterized in that, the hardness of the metal particles lies in the range 1.500 VHN to 2.500 VHN, preferably equaling approximately 2.000 VHN.
Claim 6
Dependent Claim
16 words
According to claim 1, characterized in that, the basic member (24) is made of austenitic steel.
Claim 7
Dependent Claim
24 words
According to claim 1, characterized in that, the protective cap (20) consists of metal preferably with a nitrated surface, and has radially arranged slots.
Claim 8
Dependent Claim
68 words
According to claim 6, characterized in that, the protective cap (20) in the shape of a truncated cone has an outwards chamfered lower rim running parallel to the face surface (18), and is in contact with a cap carrier (36) where it is clear of the face of the inner pole shoe (12, 16); in turn the cap carrier must be supportable on the inner pole shoe (16).
Claim 9
Dependent Claim
21 words
According to claim 7, characterized in that, the cap carrier (36) consists of a resin bonded fabric such as epoxy-resin material.
Claim 10
Dependent Claim
30 words
According to claim 6, characterized in that, the inside surface of the protective cap (20) is coated with a resin bonded fabric at least in the region of the slots.
Claim 11
Dependent Claim
18 words
According to claim 9, characterized in that, the resin bonded fabric layer is stuck to the inside surface.
Claim 12
Dependent Claim
19 words
According to claim 1, characterized in that, the protective cap is a layer of synthetic stone, such as sapphire.
Claim 13
Dependent Claim
27 words
According to claim 11, characterized in that, the inside surface of the layer of synthetic stone facing the coil is provided with a resin bonded fabric coating.
Claim 14
Dependent Claim
59 words
According to claim 1, characterized in that, the sliding protection element (22) together with the protective cap (20, 38), the cap carrier (36), the section (16) of the inner pole shoe (12) facing the workpiece (14) and the exciter and receiver coils mounted on it are arranged as a transducer head semi-permanently mounted on the inner pole shoe (12).
Claim 15
Dependent Claim
34 words
According to claim 13, characterized in that, the semi-permanent mechanical and/or electrical connection between the transducer head (10) and the lower section of inner pole shoe (12, 46) is made by a plug-and-socket connector.
Claim 16
Dependent Claim
20 words
According to claim 13, characterized in that, the sliding protection element (22) is separately removable from the transducer head (10).
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) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |