US3670319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical alarm device for oil filters responsive to water sediment level
Assignee: Bosch Corp
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Filing: 1970-08-07
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Granted: 1972-06-13
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Expires: 1990-08-07
Abstract
Abstract An alarm device for oil filters responsive to the water sediment level in the filter includes a pair of electrodes which are short-circuited when the sediment reaches a predetermined level. Short-circuiting of the electrodes energizes an alarm circuit which includes an amplifier connected to the electrodes and a relay coil connected to the output of the amplifier. First and second pairs of switching contacts controlled by the relay coil complete a circuit between the amplifier and coil and a source in the normal, unactuated states thereof. These contacts, when actuated responsive to energization of the relay coil, complete a circuit to an indicating device and to a reset switch and break the circuit between the coil and amplifier. Opening of the reset switch de-actuates the switching contacts.
Inventors
- 👤 Yoshio Ohtani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:32
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/241
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
216 words
An alarm device for water sediment in an oil filter comprising, a pair of electrodes extending within the oil filter so as to be short-circuited when the water sediment accumulated in the oil filter reaches a predetermined level, and an electrical indicating circuit comprising an amplifier having an input connected to one of said electrodes, a relay coil normally connected to the output of said amplifier and energized when the water sediment reaches said predetermined level, an electrical indicating means, a first pair of switching contacts actuated responsive to the energization of said relay coil for, in the first, unactuated state thereof, connecting the output of said amplifier to said relay coil, and for, in the second, actuated state thereof, opening the connection between the output of said amplifier and said relay coil, a second pair of switching contacts actuated responsive to the energization of said relay coil for, in the first, unactuated state thereof, completing a circuit between said amplifier and an electrical energy source, and for, in the second, actuated state thereof, completing a circuit between said indicating means and the source, and a reset switch for, when opened, de-energizing said coil, said first pair of switching contacts in the second, actuated state thereof completing a circuit between said reset switch and the source.
Claim 2
Dependent Claim
216 words
An alarm device for water sediment in an oil filter comprising, a pair of electrodes extending within the oil filter so as to be short-circuited when the water sediment accumulated in the oil filter reaches a predetermined level, and an electrical indicating circuit comprising an amplifier having an input connected to one of said electrodes, a relay coil normally connected to the output of said amplifier and energized when the water sediment reaches said predetermined level, an electrical indicating means, a first pair of switching contacts actuated responsive to the energization of said relay coil for, in the first, unactuated state thereof, connecting the output of said amplifier to said relay coil, and for, in the second, actuated state thereof, opening the connection between the output of said amplifier and said relay coil, a second pair of switching contacts actuated responsive to the energization of said relay coil for, in the first, unactuated state thereof, completing a circuit between said amplifier and an electrical energy source, and for, in the second, actuated state thereof, completing a circuit between said indicating means and the source, and a reset switch for, when opened, de-energizing said coil, said first pair of switching contacts in the second, actuated state thereof completing a circuit between said reset switch and the source.
Claim 3
Dependent Claim
208 words
In combination an oil filter and an alarm device for water sediment in the oil filter, said oil filter comprising an electrically conductive lid, a bowl, a cylinder between said lid and said bowl, and a metallic shaft mounted on the center-line of said lid, cylinder and bowl, and said alarm device comprising electrode means insulatingly mounted on said shaft spaced from the bottom of said bowl and an electrical indicating circuit comprising an amplifier having an input connected to said electrode means, a relay coil normally connected to the output of said amplifier, an electrical indicating means, first and second pairs of switching contacts actuated responsive to the energization of said relay coil for, in the first, unactuated state thereof, connecting the output of said amplifier to said relay coil and completing a circuit between said amplifier and an electrical energy source and for, in the second, actuated state thereof, opening the connection between the output of said amplifier and said relay coil, and completing a circuit between said indicating means and the source, and a reset switch for, when opened, de-energizing said coil, one of said pairs of switching contacts in the second, actuated state thereof completing a circuit between said reset switch and the source.
Claim 4
Dependent Claim
208 words
In combination an oil filter and an alarm device for water sediment in the oil filter, said oil filter comprising an electrically conductive lid, a bowl, a cylinder between said lid and said bowl, and a metallic shaft mounted on the center-line of said lid, cylinder and bowl, and said alarm device comprising electrode means insulatingly mounted on said shaft spaced from the bottom of said bowl and an electrical indicating circuit comprising an amplifier having an input connected to said electrode means, a relay coil normally connected to the output of said amplifier, an electrical indicating means, first and second pairs of switching contacts actuated responsive to the energization of said relay coil for, in the first, unactuated state thereof, connecting the output of said amplifier to said relay coil and completing a circuit between said amplifier and an electrical energy source and for, in the second, actuated state thereof, opening the connection between the output of said amplifier and said relay coil, and completing a circuit between said indicating means and the source, and a reset switch for, when opened, de-energizing said coil, one of said pairs of switching contacts in the second, actuated state thereof completing a circuit between said reset switch and the source.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |