Patent US3874333A successfully refreshed from Google Patents.
US3874333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preventing edge wrap-around in one-side electrostatic coating
Assignee: National Steel Corp
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Filing: 1972-09-28
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Granted: 1975-04-01
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Expires: 1992-09-28
Abstract
Abstract In electrostatic operations for coating one side of continuous strip, a system is provided for preventing particulate coating material from wrapping around the edge of the strip and depositing on the side of the strip which is desired to be left free of coating material. Edge wrap-around is prevented by provision of barriers which are mounted along each edge of the strip in contact with the strip edges, and which are at the same electrical potential as the strip. The barriers are mounted for sidewise movement, and are yieldably urged into contact with the strip edges. Hence, the barriers move sidewise with the strip as it wanders from a centered pass line position, yet the barriers maintain continuous contact with the strip edges.
Inventors
- 👤 James N Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:14
CPC Classifications
B; B05; B05B; B05B5/00; B05B5/08; B05B5/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
179 words
Continuous-strip electrostatic coating apparatus, comprising means defining an electrostatic coating region, transport means for conducting a continuous strip having opposite surfaces and having opposite edges along a direction of travel through the coating region for deposition of particulate coating material on one of the surfaces of the strip, means for connecting the strip to a source of electrical potential, and barrier means in the coating region for preventing coating material from bypassing the edges of the strip and depositing on the other surface of the strip, the barrier means including a barrier member extending along each edge of the strip, mounting means for mounting the barrier members in contact with the respective strip edges, and means for connecting the barrier members to the source of electrical potential of the strip, the mounting means including movable means supporting the barrier member for movement transversely to the direction of travel of the strip to accommodate movement of the strip transversely to the direction of travel, and pressure means for yieldably urging the barrier members into continuous contact with the strip edges.
Claim 2
Dependent Claim
179 words
Continuous-strip electrostatic coating apparatus, comprising means defining an electrostatic coating region, transport means for conducting a continuous strip having opposite surfaces and having opposite edges along a direction of travel through the coating region for deposition of particulate coating material on one of the surfaces of the strip, means for connecting the strip to a source of electrical potential, and barrier means in the coating region for preventing coating material from bypassing the edges of the strip and depositing on the other surface of the strip, the barrier means including a barrier member extending along each edge of the strip, mounting means for mounting the barrier members in contact with the respective strip edges, and means for connecting the barrier members to the source of electrical potential of the strip, the mounting means including movable means supporting the barrier member for movement transversely to the direction of travel of the strip to accommodate movement of the strip transversely to the direction of travel, and pressure means for yieldably urging the barrier members into continuous contact with the strip edges.
Claim 3
Dependent Claim
18 words
Apparatus as defined in claim 1, each barrier member being a plate member generally coplanar with the strip.
Claim 4
Dependent Claim
30 words
Apparatus as defined in claim 1, each barrier member including override-prevention means projecting transversely relative to the plane of the strip for preventing the strip from overriding the barrier member.
Claim 5
Dependent Claim
32 words
Apparatus as defined in claim 3, each barrier member being a plate member generally coplanar with the strip, the override-prevention means including peg members projecting in opposite directions from the plate member.
Claim 6
Dependent Claim
50 words
Apparatus as defined in claim 3, the transport means including a plurality of roller shafts extending transversely to the direction of the travel of the strip, the movable means including barrier means carried by the shafts and movable along the shafts, the barrier members being supported by the bearing means.
Claim 7
Dependent Claim
53 words
Apparatus as defined in claim 5 the pressure means including flexible tension means joining at least two bearing means which are located at opposite edges of the strip, and means acting on the flexible tension means to place tension on the flexible tension means for urging the two bearing means toward each other.
Claim 8
Dependent Claim
45 words
Apparatus as defined in claim 5, the pressure means including flexible tension means joining at least two bearing means which are located at opposite edges of the strip, and weight means carried by the flexible tension means at a location between the joined bearing means.
Claim 9
Dependent Claim
161 words
Continuous-strip electrostatic coating apparatus, comprising means defining an electrostatic coating region, means for conducting a continuous strip having opposite surfaces and having opposite edges along a direction of travel through the coating region for deposition of particulate coating material on one of the surfaces of the strip, means for connecting the strip to a source of electrical potential, and barrier means in the coating region for barring coating material from bypassing the edges of the strip and depositing on the other surface of the strip, the barrier means including a barrier member extending along each edge of the strip, mounting means for mounting the barrier members in contact with the respective strip edges, the mounting means including movable means supporting the barrier members for movement tranSversely to the direction of travel of the strip to accommodate movement of the strip transversely to the direction of travel, and means for yieldably urging the barrier members into continuous contact with the strip edges.
Claim 10
Dependent Claim
161 words
Continuous-strip electrostatic coating apparatus, comprising means defining an electrostatic coating region, means for conducting a continuous strip having opposite surfaces and having opposite edges along a direction of travel through the coating region for deposition of particulate coating material on one of the surfaces of the strip, means for connecting the strip to a source of electrical potential, and barrier means in the coating region for barring coating material from bypassing the edges of the strip and depositing on the other surface of the strip, the barrier means including a barrier member extending along each edge of the strip, mounting means for mounting the barrier members in contact with the respective strip edges, the mounting means including movable means supporting the barrier members for movement tranSversely to the direction of travel of the strip to accommodate movement of the strip transversely to the direction of travel, and means for yieldably urging the barrier members into continuous contact with the strip edges.
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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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |