US3739267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting conductive material utilizing a vapor lamp
Assignee: STEEL CORP
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Filing: 1972-05-02
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Granted: 1973-06-12
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Expires: 1992-05-02
Abstract
Abstract Apparatus for detecting conductive material, particularly a build-up at the end of a conveyor, includes a vapor lamp, an electrically conductive means around at least a portion of the lamp periphery, an AC power source, a biasing circuit for supplying a high potential DC charge to said lamp, and a probe. The probe includes a conductor adapted to contact the material and two insulated conductor leads connected to the electrically conductive means. One end of the first lead is connected to the detector conductor and the adjacent end of the second lead is insulated from the detector conductor and the first lead. A capacitor is connected in each lead. A timer relay contact is connected in parallel with the capacitor in the first lead. When conductive material is detected, the vapor lamp conducts and a circuit stops movement of the conveyor.
Inventors
- 👤 V Bart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:24
CPC Classifications
B; B65; B65G; B65G43/00; B65G43/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
In apparatus for detecting conductive material including a vapor lamp, an electrically conductive means surrounding at least a portion of the periphery of said lamp, an AC power source, a biasing circuit for supplying a high potential DC charge to said lamp, a probe connected to said electrically conductive means to cause said lamp to fire, and means operable when said vapor lamp fires for indicating the presence of conductive material; an improved probe including an electrical conductor adapted to contact said conductive material, a pair of leads the first connected to said electrical conductor and the second terminating adjacent thereto and insulated from the first lead and from said electrical conductor, a capacitor connected in each of said leads, means connecting said capacitors to said electrically conductive means, and a contact in parallel with the capacitor in said first lead adapted to be opened and closed.
Claim 2
Dependent Claim
147 words
In apparatus for detecting conductive material including a vapor lamp, an electrically conductive means surrounding at least a portion of the periphery of said lamp, an AC power source, a biasing circuit for supplying a high potential DC charge to said lamp, a probe connected to said electrically conductive means to cause said lamp to fire, and means operable when said vapor lamp fires for indicating the presence of conductive material; an improved probe including an electrical conductor adapted to contact said conductive material, a pair of leads the first connected to said electrical conductor and the second terminating adjacent thereto and insulated from the first lead and from said electrical conductor, a capacitor connected in each of said leads, means connecting said capacitors to said electrically conductive means, and a contact in parallel with the capacitor in said first lead adapted to be opened and closed.
Claim 3
Dependent Claim
30 words
Apparatus according to claim 1 which includes a timer relay coil for operating said contact, said contact being normally open but closing a predetermined time after said coil is energized.
Claim 4
Dependent Claim
31 words
Apparatus according to claim 2 which includes a circuit for supplying current to said timer relay coil, and an indicating lamp in said circuit in parallel with said Timer relay coil.
Claim 5
Dependent Claim
83 words
Apparatus according to claim 2 which includes a circuit for supplying current to said timer relay coil, a relay coil, means connecting said relay coil to said AC power source, a normally closed switch for controlling flow of current to said relay coil, and means operable by said relay coil to control flow of current to said timer relay coil and said biasing circuit, said normally closed switch being movable to open position to deenergize said relay coil and reset said detecting apparatus.
Claim 6
Dependent Claim
33 words
Apparatus according to claim 4 in which said conductive material is carried on a conveyor, and said apparatus includes means operable by said relay coil to stop said conveyor when said tube fires.
Claim 7
Dependent Claim
29 words
Apparatus according to claim 2 in which said conductive material is carried on a conveyor, and said apparatus includes means operable to stop said conveyor when said tube fires.
References Cited (Backward Citations)
US3626288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |