US3710241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting faults in extruded insulating or dielectric material
Assignee: DINEEN ENTERPRISES Inc
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Filing: 1970-09-08
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Granted: 1973-01-09
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Expires: 1990-09-08
Abstract
Abstract Disclosed is a method of detecting faults or discontinuities in the insulating or dielectric properties of an extruded tube. A high voltage potential is established between a ring which surrounds the tube as it emerges from the extrusion die and the extrusion core. Any conduction between the ring and the core unbalances a bridge network which then activates a relay to indicate the presence of a fault or discontinuity. A die or paint sprayer or a warning device may also be controlled by the relay to mark the location of the fault or defect.
Inventors
- 👤 W Dineen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:25
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/20; G01N27/205; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/15; B29C48/25; B29C48/30; B29C48/32; B29C48/92; G01R; G01R31/00; G01R31/50; G01R31/58; G01R31/59; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92238; B29C2948/92295; B29C2948/92323; B29C2948/92361; B29C2948/92409
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
183 words
Apparatus for detecting faults in an extruded insulating or dielectric material formed by an extrusion press having a die block and a central core projecting through the die opening which comprises: (1) a cylindrically shaped dielectric mounting ring attached to the die block and surrounding the central core, (2) an electrically conducting sensing ring removably, threadably received in a sealed relationship in the mounting ring, and where the radially inner surface of the mounting ring and the sensing ring are of the same diameter and form a concentric cylindrical relationship therebetween and which diameter is slightly greater than the external diameter of the materials being extruded at the die block so the material when expanded after the die block will be closely adjacent or lightly contacting the internal surface of the sensing ring, (3) means to provide a high voltage potential to the sensing ring, (4) means to ground the central core, and (5) circuit means to detect when the voltage potential on the sensing ring drops as a result of a spark having jumped from the detecting ring to the central core.
Claim 2
Dependent Claim
183 words
Apparatus for detecting faults in an extruded insulating or dielectric material formed by an extrusion press having a die block and a central core projecting through the die opening which comprises: (1) a cylindrically shaped dielectric mounting ring attached to the die block and surrounding the central core, (2) an electrically conducting sensing ring removably, threadably received in a sealed relationship in the mounting ring, and where the radially inner surface of the mounting ring and the sensing ring are of the same diameter and form a concentric cylindrical relationship therebetween and which diameter is slightly greater than the external diameter of the materials being extruded at the die block so the material when expanded after the die block will be closely adjacent or lightly contacting the internal surface of the sensing ring, (3) means to provide a high voltage potential to the sensing ring, (4) means to ground the central core, and (5) circuit means to detect when the voltage potential on the sensing ring drops as a result of a spark having jumped from the detecting ring to the central core.
Claim 3
Dependent Claim
72 words
Apparatus according to claim 1 where the circuit means includes a balanced diode bridge for detecting potential change in the Sensing ring, a switching transistor held in a non-conducting state when the diode bridge is balanced and conducting when the bridge becomes unbalanced due to a potential change in the sensing ring, indicating means, and a relay controlled by the switching transistor to energize the indicating means when a potential change occurs.
Claim 4
Dependent Claim
35 words
Apparatus according to claim 2 which includes means within the circuit to test the operability thereof, and means to change the sensitivity of the circuit to compensate for variable materials and various thicknesses being extruded.
Claim 5
Dependent Claim
29 words
Apparatus according to claim 3 where the fault indicating circuit includes means to mark the dielectric with a visible indication when a fault has been detected by the circuit.
Claim 6
Dependent Claim
28 words
Apparatus according to claim 1 where the mounting ring and the sensing ring carried thereby are formed of semicircular ring sections joined together by hinge and latch means.
Claim 7
Dependent Claim
34 words
Apparatus according to claim 1 which includes a Teflon coating over the internal diameter surfaces of the mounting ring, and where the sensing ring is spaced from the die block by the mounting ring.
References Cited (Backward Citations)
US2456704A
Cited
GB761241A
Cited
US2900597A
Cited
US2894204A
Cited
US3045281A
Cited
US3446884A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |