Patent US4398642A successfully refreshed from Google Patents.
Patent US5088593A successfully refreshed from Google Patents.
US5088593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conveyor belt with built-in magnetic-motor linear drive
Assignee: Individual
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Filing: 1990-10-31
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Granted: 1992-02-18
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Expires: 2010-10-31
Abstract
Abstract A conveyor has an endless belt spanned over upstream and downstream rollers and having upper and lower stretches. The belt has an outer surface adapted to carry a load in the upper stretch and a lower surface turned inward. Permanent magnets are fixed to the inner surface of the belt and a linear-motor stator is provided underneath the upper stretch and juxtaposed with the permanent magnets thereof. The stator and magnets together form a linear motor for advancing the upper stretch downstream. An array of such permanent magnets is imbedded in the lower surface of the belt spaced apart to permit the belt to flex.
Inventors
- 👤 Heinz-Ulrich Lewin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:38
CPC Classifications
B; B65; B65G; B65G23/00; B65G23/22; B65G23/23; H; H02; H02K; H02K41/00; H02K41/02; H02K41/03
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
In a conveyor having an endless belt spanned over upstream and downstream rollers and having upper and lower stretches, the belt having an outer surface adapted to carry a load in the upper stretch and a lower surface turned inward, the improvement comprising: permanent magnets fixed to the inner surface of the belt; and a linear-motor stator underneath the upper stretch and juxtaposed with the permanent magnets thereof, the stator and magnets together forming a linear motor for advancing the upper stretch downstream, the lower surface being formed relative to a normal longitudinal travel direction of the belt with a longitudinally extending ridge in which the magnets are imbedded.
Claim 2
Dependent Claim
109 words
In a conveyor having an endless belt spanned over upstream and downstream rollers and having upper and lower stretches, the belt having an outer surface adapted to carry a load in the upper stretch and a lower surface turned inward, the improvement comprising: permanent magnets fixed to the inner surface of the belt; and a linear-motor stator underneath the upper stretch and juxtaposed with the permanent magnets thereof, the stator and magnets together forming a linear motor for advancing the upper stretch downstream, the lower surface being formed relative to a normal longitudinal travel direction of the belt with a longitudinally extending ridge in which the magnets are imbedded.
Claim 3
Dependent Claim
20 words
The conveyor defined in claim 1 wherein the ridge has opposite flat longitudinally extending sides and a thickened outer edge.
Claim 4
Dependent Claim
34 words
The conveyor defined in claim 1 wherein the ridge is formed with longitudinally spaced inwardly open notches and is provided with the magnets between the notches, whereby the belt can flex at the notches.
Claim 5
Dependent Claim
34 words
The conveyor defined in claim 1, further comprising additional permanent magnets in the belt adjacent the ridge and an additional stator juxtaposed with the additional permanent magnets and energized to lift the upper stretch.
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) | 1995-02-17 | 1995-08-19 | 1996-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-17 | 1999-08-19 | 2000-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-17 | 2003-08-19 | 2004-02-18 | $7700.00 | Window Closed / Lapsed |