US3873789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Belt position indicator switch with feeler arm
Assignee: LE WARREN Inc A CORP OF MI
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Filing: 1973-11-19
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Granted: 1975-03-25
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Expires: 1993-11-19
Abstract
Abstract A position indicator for conveyor belts, drive belts, or the like adapted to be engaged by the edge of a misaligned or offcenter running belt, sufficient displacement of the indicator causing actuation of an electric switch for stopping the belt drive motor, indicating an alarm, or the like. The indicator includes an electric switch housing of nonmagnetic material having a magnetic actuating arm, and a magnet mounted upon a lever exteriorly mounted upon the switch housing engageable by the edge of the belt produces actuation of the switch arm upon the lever being sufficiently displaced in close proximity to the housing.
Inventors
- 👤 Achard L Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:12
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/02; H01H13/12; H01H13/14; H01H13/18; H01H13/186; H01H36/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
A position indicator for moving belt comprising, in combination, a housing defining a chamber, said housing having a nonmagnetic wall, an electric switch mounted within said housing, a magnetically responsive switch operating arm mounted on said switch movable between switch operating positions, a cantilever supported lever externally mounted on said housing movable toward said housing and said switch arm upon being engaged by the edge of a moving belt, said lever including a resilient support portion and a nonmagnetic portion, a magnet mounted on said lever nonmagnetic portion for attracting said switch arm to operate said switch upon said lever being disposed adjacent said housing and switch arm, said lever resilient support portion normally positioning said lever nonmagnetic portion and magnet spaced from said switch arm to prevent attraction of said switch arm by said magnet, said housing nonmagnetic wall being disposed between said lever and said switch operating arm.
Claim 2
Dependent Claim
150 words
A position indicator for moving belt comprising, in combination, a housing defining a chamber, said housing having a nonmagnetic wall, an electric switch mounted within said housing, a magnetically responsive switch operating arm mounted on said switch movable between switch operating positions, a cantilever supported lever externally mounted on said housing movable toward said housing and said switch arm upon being engaged by the edge of a moving belt, said lever including a resilient support portion and a nonmagnetic portion, a magnet mounted on said lever nonmagnetic portion for attracting said switch arm to operate said switch upon said lever being disposed adjacent said housing and switch arm, said lever resilient support portion normally positioning said lever nonmagnetic portion and magnet spaced from said switch arm to prevent attraction of said switch arm by said magnet, said housing nonmagnetic wall being disposed between said lever and said switch operating arm.
Claim 3
Dependent Claim
28 words
In a position indicator for a moving belt as in claim 1 wherein said lever resilient support portion comprises a leaf spring attaching said lever upon said housing.
Claim 4
Dependent Claim
22 words
In a position indicator for a moving belt as in claim 1 wherein said entire housing is formed of a nonmagnetic material.
Claim 5
Dependent Claim
19 words
In a position indicator for a moving belt as in claim 3 wherein said housing comprises an aluminum casting.
Claim 6
Dependent Claim
61 words
In a position indicator for a moving belt as in claim 1 wherein said lever mounted upon said housing includes an inner mounted end, an intermediate portion and an outer free end, said inner end constituting a leaf spring defining said resilient support portion, said intermediate portion defining said nonmagnetic portion, and said outer free end comprising a belt engageable member.
References Cited (Backward Citations)
US2738496A
Cited
US2945102A
Cited
US3201537A
Cited
US3402269A
Cited
US3397372A
Cited
US3349203A
Cited
US3418610A
Cited
US3569642A
Cited
US3619523A
Cited
US3513273A
Cited
US3539741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |