Patent US3680686A successfully refreshed from Google Patents.
US3680686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Belt penetration sensing apparatus
Assignee: FMC Corp
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Filing: 1971-02-12
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Granted: 1972-08-01
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Expires: 1991-02-12
Abstract
Abstract A device to protect a conveyor belt from tearing after penetration by an object at a loading region. The device consists of a series of force-sensitive switches having contact surfaces that are perpendicular to the underside of the belt and an electrical circuit interconnected with the switches that will shut down the conveyor and sound the alarm with the actuation of one of the switches by a penetrating object.
Inventors
- 👤 Bernard A Ciesielski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:41
CPC Classifications
B; B65; B65G; B65G43/00; B65G43/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
A protection device to protect a moving web of material against tearing by an object penetrating the web of material comprising, in combination, means to support the web for movement along a path, a force-sensitive sensing element having a planar sensing surface inclined with respect to said path, said element being actuated by an object that has penetrated the web, and means responsive to the actuation of the sensing element for stopping movement of the web of material.
Claim 2
Dependent Claim
78 words
A protection device to protect a moving web of material against tearing by an object penetrating the web of material comprising, in combination, means to support the web for movement along a path, a force-sensitive sensing element having a planar sensing surface inclined with respect to said path, said element being actuated by an object that has penetrated the web, and means responsive to the actuation of the sensing element for stopping movement of the web of material.
Claim 3
Independent Claim
90 words
A device to protect the belt of a belt conveyor from tearing after penetration by an object in the material being carried by the belt, comprising, in combination, force-actuated sensing means positioned below the belt and having means defining a planar sensing surface oriented at an angle to the belt and extending across the belt, said planar sensing surface deflecting under contact with the object penetrating the belt at any lateral position on the belt, and means responsive to the deflection of the sensing element for stopping the belt conveyor.
Claim 4
Independent Claim
90 words
A device to protect the belt of a belt conveyor from tearing after penetration by an object in the material being carried by the belt, comprising, in combination, force-actuated sensing means positioned below the belt and having means defining a planar sensing surface oriented at an angle to the belt and extending across the belt, said planar sensing surface deflecting under contact with the object penetrating the belt at any lateral position on the belt, and means responsive to the deflection of the sensing element for stopping the belt conveyor.
Claim 5
Independent Claim
105 words
A device to protect the carrying run of a belt of a belt conveyor against tearing after penetration by an object in the material being carried on the belt, comprising, in combination, a force-sensitive switch having a planar sensing surface perpendicular to the belt and positioned below the belt, said sensing surface extending across the belt and deflecting under contact with the object penetrating the belt to actuate the switch at any lateral position on the belt, and an electrical circuit including the switch, said electrical circuit arranged to close as the switch is contacted by the object to stop the movement of the belt.
Claim 6
Independent Claim
105 words
A device to protect the carrying run of a belt of a belt conveyor against tearing after penetration by an object in the material being carried on the belt, comprising, in combination, a force-sensitive switch having a planar sensing surface perpendicular to the belt and positioned below the belt, said sensing surface extending across the belt and deflecting under contact with the object penetrating the belt to actuate the switch at any lateral position on the belt, and an electrical circuit including the switch, said electrical circuit arranged to close as the switch is contacted by the object to stop the movement of the belt.
Claim 7
Dependent Claim
136 words
In a belt conveyor system, an endless belt, a motor for moving the belt to convey objects, a chute for loading the objects onto the belt, a plurality of force sensitive switches below and co-extensive with the transverse dimension of the lower surface of the belt, said switcheS having sensing surfaces substantially perpendicular to the belt for operation by an object that has penetrated the belt, an alarm to signal the penetration of the belt by an object and an electrical circuit that is energized with the operation of one of the switches to stop the motor and ring the alarm, said circuit including sealing contacts, said sealing contacts being actuated with the actuation of the switch to insure that the belt remains stopped in the event that the switch is destroyed by the penetrating object.
Claim 8
Dependent Claim
136 words
In a belt conveyor system, an endless belt, a motor for moving the belt to convey objects, a chute for loading the objects onto the belt, a plurality of force sensitive switches below and co-extensive with the transverse dimension of the lower surface of the belt, said switcheS having sensing surfaces substantially perpendicular to the belt for operation by an object that has penetrated the belt, an alarm to signal the penetration of the belt by an object and an electrical circuit that is energized with the operation of one of the switches to stop the motor and ring the alarm, said circuit including sealing contacts, said sealing contacts being actuated with the actuation of the switch to insure that the belt remains stopped in the event that the switch is destroyed by the penetrating object.
References Cited (Backward Citations)
US2475404A
Cited
US2880852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |