US4289722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of potting magnetic speed pickups
Assignee: Motors Liquidation Co
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Filing: 1980-07-28
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Granted: 1981-09-15
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Expires: 2000-07-28
Abstract
Abstract A potting process for a magnetic speed pickup including elements subject to substantial thermal expansion and contraction, wherein each step of the potting process is performed at an elevated temperature corresponding to the highest expected temperature for a given application. As a result, adequate spacing is provided between the various pickup elements to accommodate for thermal expansion and contraction of the elements when the pickup is used in a thermally variant environment.
Inventors
- 👤 Glen E. Tranbarger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:35
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11; H01F1/113; B; B29; B29C; B29C37/00; B29C37/005; B29C39/00; B29C39/02; B29C39/10; B29C70/00; B29C70/68; B29C70/70; G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/488; B29K; B29K2105/00; B29K2105/06; B29K2105/20; B29K2105/203
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
A method of potting a magnetic pickup assembly that comprises a housing containing a permanent magnet of a type that thermally expands with increasing temperature comprising the steps of: heating the pickup assembly to a temperature that causes thermal expansion of the permanent magnet; introducing a resinous material into said housing; evacuating the pickup assembly so that said resinous material impregnates the spaces surrounding said permanent magnet; curing said resinous material by maintaining the temperature of the material at a predetermined value for a period of time sufficient to solidify said material; and cooling said assembly to permit said permanent magnet to contract, whereby adequate spacing is provided within said pickup assembly to accommodate for thermal expansion and contraction of said permanent magnet.
Claim 2
Independent Claim
123 words
A method of potting a magnetic pickup assembly that comprises a housing containing a permanent magnet of a type that thermally expands with increasing temperature comprising the steps of: heating the pickup assembly to a temperature that causes thermal expansion of the permanent magnet; introducing a resinous material into said housing; evacuating the pickup assembly so that said resinous material impregnates the spaces surrounding said permanent magnet; curing said resinous material by maintaining the temperature of the material at a predetermined value for a period of time sufficient to solidify said material; and cooling said assembly to permit said permanent magnet to contract, whereby adequate spacing is provided within said pickup assembly to accommodate for thermal expansion and contraction of said permanent magnet.
Claim 3
Independent Claim
118 words
A method of potting a magnetic pickup assembly that comprises a housing containing a plastic magnet comprising the steps of: heating the pickup assembly to a temperature that equals or exceeds the use temperature for the intended pickup application; introducing a resinous material into said housing; evacuating the pickup assembly so that said resinous material impregnates the spaces surrounding said magnet; curing said resinous material by maintaining the temperature of the assembly at or higher than said use temperature for a period of time sufficient to solidify said material; and cooling said assembly to permit said magnet to contract, whereby adequate spacing is provided within said pickup assembly to accommodate for thermal expansion and contraction of said magnet.
Claim 4
Independent Claim
118 words
A method of potting a magnetic pickup assembly that comprises a housing containing a plastic magnet comprising the steps of: heating the pickup assembly to a temperature that equals or exceeds the use temperature for the intended pickup application; introducing a resinous material into said housing; evacuating the pickup assembly so that said resinous material impregnates the spaces surrounding said magnet; curing said resinous material by maintaining the temperature of the assembly at or higher than said use temperature for a period of time sufficient to solidify said material; and cooling said assembly to permit said magnet to contract, whereby adequate spacing is provided within said pickup assembly to accommodate for thermal expansion and contraction of said magnet.
Claim 5
Independent Claim
127 words
A method of potting a magnetic pickup assembly that comprises a housing containing a polymer bonded barium-ferrite magnet comprising the steps of: heating the pickup assembly to a temperature that equals or exceeds the use temperature for the intended pickup application; introducing a heated resinous material comprising epoxy resin and hardener into said housing; evacuating the pickup assembly so that said resinous material impregnates the spaces surrounding said magnet; curing said resinous material by maintaining the temperature of the pickup assembly at or higher than said use temperature for a period of time sufficient to solidify said material; and cooling said assembly to permit said magnet to contract, whereby adequate spacing is provided within said pickup assembly to accommodate for thermal expansion and contraction of said magnet.
Claim 6
Independent Claim
127 words
A method of potting a magnetic pickup assembly that comprises a housing containing a polymer bonded barium-ferrite magnet comprising the steps of: heating the pickup assembly to a temperature that equals or exceeds the use temperature for the intended pickup application; introducing a heated resinous material comprising epoxy resin and hardener into said housing; evacuating the pickup assembly so that said resinous material impregnates the spaces surrounding said magnet; curing said resinous material by maintaining the temperature of the pickup assembly at or higher than said use temperature for a period of time sufficient to solidify said material; and cooling said assembly to permit said magnet to contract, whereby adequate spacing is provided within said pickup assembly to accommodate for thermal expansion and contraction of said magnet.
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) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |