US3923449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multistage oven with progressive circulation
Assignee: Astec Industries Inc
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Filing: 1974-03-22
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Granted: 1975-12-02
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Expires: 1994-03-22
Abstract
Abstract A multiple stage oven for heating a product such as carpet or the like, which serially moves through each stage to be heated. Each stage of the oven includes a fuel burner for heating air within the stage, and a fan for recirculating the heated air in the stage for impingement onto a carpet product moving through the stage. A portion of the heated air within each stage is drawn from that stage and supplied to a serially preceding stage. The volume of air withdrawn from the last stage in the serial arrangement, and also the volume of make-up air admitted to the first stage thereof, does not exceed the sum of the fuel combustion products within the zones and any moisture or other substance evaporated or evolved from the carpet in each of the heating zones.
Inventors
- 👤 James Donald Brock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:35
CPC Classifications
D; D06; D06C; D06C7/00; F; F26; F26B; F26B13/00; F26B13/10; F27; F27B; F27B9/00; F27B9/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
210 words
Apparatus for progressively heating a moving web of material while the material is moving along a predetermined path, comprising: closure means enclosing the web along at least part of said predetermined path, said closure means defining at least a first heating zone and a second heating zone within; said first and second heating zones being serially disposed within said closure means so that a web being moved along said predetermined path initially passes through said first heating zone and subsequently passes through said second heating zone; first fluid heating means associated with said first heating zone and operative to apply heated fluid directly to the web passing through said first heating zone; second fluid heating means associated with said second heating zone and operative to apply heated fluid directly to the web passing through said second heating zone; exhaust means directly communicating with said first heating zone to withdraw fluid only from said first heating zone and to discharge said withdrawn fluid from said heating apparatus; means supplying said first heating zone with substantial make-up fluid only from said second heating zone; and means associated with said first zone to substantially prevent the entry of make-up fluid into said first zone from any source other than said second heating zone.
Claim 2
Dependent Claim
210 words
Apparatus for progressively heating a moving web of material while the material is moving along a predetermined path, comprising: closure means enclosing the web along at least part of said predetermined path, said closure means defining at least a first heating zone and a second heating zone within; said first and second heating zones being serially disposed within said closure means so that a web being moved along said predetermined path initially passes through said first heating zone and subsequently passes through said second heating zone; first fluid heating means associated with said first heating zone and operative to apply heated fluid directly to the web passing through said first heating zone; second fluid heating means associated with said second heating zone and operative to apply heated fluid directly to the web passing through said second heating zone; exhaust means directly communicating with said first heating zone to withdraw fluid only from said first heating zone and to discharge said withdrawn fluid from said heating apparatus; means supplying said first heating zone with substantial make-up fluid only from said second heating zone; and means associated with said first zone to substantially prevent the entry of make-up fluid into said first zone from any source other than said second heating zone.
Claim 3
Dependent Claim
37 words
Apparatus as in claim 1, wherein each of said heating zones includes a fluid circulating means operative to recirculate a flow of heated fluid in said heating zone onto the web passing through the said heating zone.
Claim 4
Dependent Claim
23 words
Apparatus as in claim 1, wherein said make-up fluid supply means comprises a fluid flow conduit connecting said first and second heating zones.
Claim 5
Dependent Claim
31 words
Apparatus as in claim 3, further comprising means operatively associated with said fluid flow conduit to move fluid from said second heating zone through said conduit to said first heating zone.
Claim 6
Dependent Claim
208 words
ApparatUs for progressively applying heat to a web of material which is moving along a predetermined path and which may contain moisture, comprising: closure means enclosing at least a portion of said predetermined path, said closure means defining a plurality of separate web heating zones serially disposed along the enclosed portion of said path; at least some of said heating zones including individual means for directing a stream of heated fluid onto at least one side of the web passing through the respective zone; exhaust means directly communicating with the first one of said heating zones through which the web initially passes and operative to withdraw fluid therefrom and to discharge said withdrawn fluid from said heating apparatus; fluid flow communication means directly connecting each of said heating zones, except for the final one of the heating zones along which the web passes, with a serially subsequent heating zone and allowing said first heating zone and each such connected heating zones to receive substantial make-up fluid only from such serially subsequent heating zone; and means associated with each at said heating zones, except for said final heating zones, to substantially prevent make-up fluid from entering such heating zones from any source other than said fluid flow communication means.
Claim 7
Dependent Claim
208 words
ApparatUs for progressively applying heat to a web of material which is moving along a predetermined path and which may contain moisture, comprising: closure means enclosing at least a portion of said predetermined path, said closure means defining a plurality of separate web heating zones serially disposed along the enclosed portion of said path; at least some of said heating zones including individual means for directing a stream of heated fluid onto at least one side of the web passing through the respective zone; exhaust means directly communicating with the first one of said heating zones through which the web initially passes and operative to withdraw fluid therefrom and to discharge said withdrawn fluid from said heating apparatus; fluid flow communication means directly connecting each of said heating zones, except for the final one of the heating zones along which the web passes, with a serially subsequent heating zone and allowing said first heating zone and each such connected heating zones to receive substantial make-up fluid only from such serially subsequent heating zone; and means associated with each at said heating zones, except for said final heating zones, to substantially prevent make-up fluid from entering such heating zones from any source other than said fluid flow communication means.
Claim 8
Dependent Claim
29 words
Apparatus as in claim 5, wherein said final heating zone includes means operative to admit make-up fluid to said final heating zone from a source external to said apparatus.
Claim 9
Dependent Claim
51 words
Apparatus as in claim 5, wherein each of said means for directing a stream of heated fluid comprises a fuel combustion means connected to receive and burn a fuel-air mixture to provide heated fluid, and means operative to direct said heated fluid onto the web passing through the respective heating zone.
Claim 10
Dependent Claim
52 words
Apparatus as in claim 7, wherein said exhaust means is operative to withdraw from said first heating zone a volume of fluid at least equal to the total amount of combustion products of all said fuel combustion means plus the volume of moisture evaporated from the web passing through said heating zones.
Claim 11
Dependent Claim
57 words
Apparatus as in claim 1, wherein: said make-up fluid means comprises a fluid flow path having an inlet directly communicating with said second heating zone and an outlet directly communicating with said first zone; and further comprising means operative to maintain fluid flow through said flow path from said second heating zone to said first heating zone.
References Cited (Backward Citations)
US1798718A
Cited
US1860887A
Cited
US2107275A
Cited
US2441500A
Cited
US2743529A
Cited
US2799096A
Cited
US2838420A
Cited
US3581679A
Cited
US3623235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |