US3664191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Explosion-proof self-cleaning electrodes
Assignee: Fischer and Porter Co
•
Filing: 1970-06-01
•
Granted: 1972-05-23
•
Expires: 1990-06-01
Abstract
Abstract An explosion-proof, self-cleaning electrode for use in magnetic flowmeters, measurement probes and other instruments in which an electrode is exposed to a contaminating fluid that is explosive in nature and also tends to coat the electrode with material which interferes with its proper operation. The electrode is provided with an ultrasonic transducer to produce ultrasonic energy which is transmitted to the fluid to create cavitation effects therein, acting to clean the exposed surface of the electrode. The transducer is mounted on the electrode within a protective shield to prevent high voltage applied to the transducer from reaching the electrode and producing a spark igniting an explosive fluid.
Inventors
- 👤 Henry Hermanns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:23
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/56; G01F1/58; G01F1/584; G01F15/00; G01F15/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
182 words
A self-cleaning, explosion-proof electrode and ultrasonic transducer assembly comprising: A. an electrode having a head provided with a threaded bore, B. an annular transducer crystal adapted to generate ultrasonic energy, C. a bolt having a shank passing through the crystal, the end of the bolt being threadably received in the head of said electrode, said shank having an insulating tube thereon, D. an insulating disc interposed between said crystal and said head, E. a first shielding plate surrounding said bolt and engaging the undersurface of the crystal, F. a contact plate surrounding the bolt aNd engaging the upper surface of the crystal, a lead being connected to said contact plate to apply high voltage thereto to excite said crystal, G. a second shielding plate disposed above said contact plate and insulated from said contact plate and said bolt, said shielding plate having a central sleeve extending along said insulating tube to a point below said first shielding plate to define therewith a protective chamber isolating said high voltage from said electrode, and H. means to ground said first and second shielding plates.
Claim 2
Dependent Claim
182 words
A self-cleaning, explosion-proof electrode and ultrasonic transducer assembly comprising: A. an electrode having a head provided with a threaded bore, B. an annular transducer crystal adapted to generate ultrasonic energy, C. a bolt having a shank passing through the crystal, the end of the bolt being threadably received in the head of said electrode, said shank having an insulating tube thereon, D. an insulating disc interposed between said crystal and said head, E. a first shielding plate surrounding said bolt and engaging the undersurface of the crystal, F. a contact plate surrounding the bolt aNd engaging the upper surface of the crystal, a lead being connected to said contact plate to apply high voltage thereto to excite said crystal, G. a second shielding plate disposed above said contact plate and insulated from said contact plate and said bolt, said shielding plate having a central sleeve extending along said insulating tube to a point below said first shielding plate to define therewith a protective chamber isolating said high voltage from said electrode, and H. means to ground said first and second shielding plates.
Claim 3
Dependent Claim
22 words
An assembly as set forth in claim 1, wherein said crystal is surrounded by an insulating collar through which said lead passes.
Claim 4
Dependent Claim
21 words
An assembly as set forth in claim 1, wherein said shank of the bolt is undercut to accommodate said insulating tube.
Claim 5
Dependent Claim
22 words
An assembly as set forth in claim 1, wherein said shielding plates are each provided with diametrically opposed lugs which are grounded.
Claim 6
Dependent Claim
25 words
An assembly as set forth in claim 1, wherein said second shielding plate is the base of a container enclosing the head of the bolt.
References Cited (Backward Citations)
US1701562A
Cited
US2514080A
Cited
US2523082A
Cited
US2947801A
Cited
US3341430A
Cited
US3486376A
Cited
US3479873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |