US3556152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary valve
Assignee: International Paper Co
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Filing: 1968-10-24
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Granted: 1971-01-19
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Expires: 1988-10-24
Abstract
Abstract In a system for transporting limp flexible articles, a device is provided for controlling application of suction pressure to hold an article on a movable conveyor, and application of an above atmospheric pressure to accurately expel and deposit the article on a receiver. The control device includes a valve body having an interior cylindrical bore in which a vane is mounted for turning movement about the longitudinal axis of the bore. The bore is connected to a vacuum pump which applies a suction force through an opening in the valve body to hold the sheets on a mesh belt carrier. The suction force is effective until the vane turns to cover the opening and thereby effectively seals the opening to the suction force. Substantially simultaneously, a positive pressure air passageway in the vane is aligned with the opening and the positive air pressure ejects the article to the receiver. The vane extends to and in sealing engagement with the bore wall of the valve body so that the positive pressure is ineffective until the vane is aligned with the opening.
Inventors
- 👤 Ernst Daniel Nystrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:07
CPC Classifications
B; B65; B65G; B65G21/00; B65G21/20; B65G21/2027; B65G21/2036; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86638; Y10T137/86718; Y10T137/86743
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
303 words
A rotary valve for providing at time intervals a differential pressure flow of fluid comprising a valve body having a cylindrical interior wall defining an elongated bore about a longitudinal axis, said valve body having an opening extending to said bore and in fluid communication therewith, end caps on said valve body closing the ends of said elongated cylindrical bore with at least one of said end caps having a port therein, an elongated vane extending longitudinally within said bore between said end caps and mounted for turning about the longitudinal axis of said bore, means on said end caps for journaling said vane for rotation, said vane having a portion extending radially from said axis to adjacent to said cylindrical bore wall, a passageway in said vane extending longitudinally of said vane and in fluid communication with said port in said cap, said vane passageway having a radially directed portion extending radially towards and longitudinally along said cylindrical wall, a seal bar on said radial end of said vane having a series of apertures therein alignment with said passageway portion in said vane to permit the flow of fluid therethrough, said seal bar extending to said cylindrical wall so that said series of apertures therein are substantially covered by said cylindrical wall during a substantial turning movement of said vane, a series of apertures disposed longitudinally along said valve body and defining a second fluid flow port in said valve body and being aligned with said apertures on said seal bar during a portion of the turning movement of said vane, said seal bar having a trailing sealing portion bridging said apertures in said valve body, and means for continuously turning said vane to alternately expose said second port to fluid flow from said vane and said bore as the vane turns.
Claim 2
Dependent Claim
303 words
A rotary valve for providing at time intervals a differential pressure flow of fluid comprising a valve body having a cylindrical interior wall defining an elongated bore about a longitudinal axis, said valve body having an opening extending to said bore and in fluid communication therewith, end caps on said valve body closing the ends of said elongated cylindrical bore with at least one of said end caps having a port therein, an elongated vane extending longitudinally within said bore between said end caps and mounted for turning about the longitudinal axis of said bore, means on said end caps for journaling said vane for rotation, said vane having a portion extending radially from said axis to adjacent to said cylindrical bore wall, a passageway in said vane extending longitudinally of said vane and in fluid communication with said port in said cap, said vane passageway having a radially directed portion extending radially towards and longitudinally along said cylindrical wall, a seal bar on said radial end of said vane having a series of apertures therein alignment with said passageway portion in said vane to permit the flow of fluid therethrough, said seal bar extending to said cylindrical wall so that said series of apertures therein are substantially covered by said cylindrical wall during a substantial turning movement of said vane, a series of apertures disposed longitudinally along said valve body and defining a second fluid flow port in said valve body and being aligned with said apertures on said seal bar during a portion of the turning movement of said vane, said seal bar having a trailing sealing portion bridging said apertures in said valve body, and means for continuously turning said vane to alternately expose said second port to fluid flow from said vane and said bore as the vane turns.
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |