Patent US3736448A successfully refreshed from Google Patents.
US3736448A
Expired / Lapsed
US
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Displacement transducer
Assignee: BONAL MACHINE Co
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Filing: 1971-11-01
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Granted: 1973-05-29
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Expires: 1991-11-01
Abstract
Abstract An electromechanical transducer for developing electrical signal measurements of mechanical vibrations. A magnet is guided for lengthwise movement within a coil whose length is substantially equal to that of the magnet. A high-permeability casing surrounds the coil and serves to concentrate the magnetic flux of the magnet such that the magnet tends to center itself lengthwise of the coil. Upon oscillation of the transducer body on which the coil and the casing are fixedly mounted, the magnet oscillates lengthwise within the coil to develop the electric signal voltage.
Inventors
- 👤 A Hebel Jr
- 👤 A Hebel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:35
CPC Classifications
H; H02; H02K; H02K35/00; H02K35/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
139 words
A displacement transducer adapted to be mounted on a vibrating object for generating an electrical signal measurement of vibrations in the object and of the type including a support body, a coil within the body and a magnet axially movable within said coil, that improvement which comprises a body formed with a main cylindrical recess to receive a coil and a smaller recess with a concave end surface at one end of said cylindrical recess, a spacer at the other end of said recess to close said recess and having a recess with a concave end surface coaxial with said first recited smaller recess, a resilient bumper disc in each said coaxial end recesses enclosing said concave surfaces, said magnet lying mechanically unrestrained between said discs and having a length slightly less than the axial distance between said discs.
Claim 2
Dependent Claim
139 words
A displacement transducer adapted to be mounted on a vibrating object for generating an electrical signal measurement of vibrations in the object and of the type including a support body, a coil within the body and a magnet axially movable within said coil, that improvement which comprises a body formed with a main cylindrical recess to receive a coil and a smaller recess with a concave end surface at one end of said cylindrical recess, a spacer at the other end of said recess to close said recess and having a recess with a concave end surface coaxial with said first recited smaller recess, a resilient bumper disc in each said coaxial end recesses enclosing said concave surfaces, said magnet lying mechanically unrestrained between said discs and having a length slightly less than the axial distance between said discs.
Claim 3
Dependent Claim
100 words
A displacement transducer as defined in claim 1 in which a high permeability magnetic circuit path is formed externally of said coil comprising a cylindrical tube surrounding said coil, and end pieces closing each end of said tube at the end of said coil, each end piece having a central opening adjacent a respective bumper disc, said magnet having a length substantially coextensive with the space between said end pieces and a transverse dimension to permit the ends thereof to pass through said central opening to allow free oscillation between said bumper discs in response to vibrations of said object.
References Cited (Backward Citations)
US3129347A
Cited
US3633053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |