Patent US3875904A successfully refreshed from Google Patents.
US3875904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for cleaning air passage openings in the walls of a refuse burning furnace
Assignee: Gotaverken Angteknik AB
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Filing: 1974-02-20
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Granted: 1975-04-08
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Expires: 1994-02-20
Abstract
Abstract An air passage in the wall of a refuse burning furnace is cleaned by means of a sleeve, which normally is used for governing the air flow by axial displacement of one of its ends within the passage proper. This sleeve is mounted so it can be occasionally pushed right through the passage and furthermore in such a manner that air is prevented, in use, from passing into the sleeve, whereby the latter may be used for inspection purposes.
Inventors
- 👤 Ingmar Astrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:22
CPC Classifications
F; F23; F23J; F23J3/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
In a refuse burning furnace, walls defining the furnace, a number of combustion air passage openings in the walls, conduit means outside said walls for supplying air to said passages openings and means, at least at some of said passages openings, for mechanically scraping the passage openings, said means including a sleeve extending into and being axially displaceable with respect to the pertaining passage opening, the improvement of means defining the passage opening so as to present a crosssection decreasing in the direction of flow, means for hermetically mounting the end of the sleeve remote from the wall with respect to the conduit, and further means for making the end of the sleeve remote from the wall accessible from outside the air conduit.
Claim 2
Dependent Claim
123 words
In a refuse burning furnace, walls defining the furnace, a number of combustion air passage openings in the walls, conduit means outside said walls for supplying air to said passages openings and means, at least at some of said passages openings, for mechanically scraping the passage openings, said means including a sleeve extending into and being axially displaceable with respect to the pertaining passage opening, the improvement of means defining the passage opening so as to present a crosssection decreasing in the direction of flow, means for hermetically mounting the end of the sleeve remote from the wall with respect to the conduit, and further means for making the end of the sleeve remote from the wall accessible from outside the air conduit.
Claim 3
Dependent Claim
32 words
The refuse burning furnace according to claim 1, in which a conduit connected to a source generating mist, gases or vapor and located adjacent to the furnace is connected to the sleeve.
Claim 4
Dependent Claim
61 words
The refuse burning furnace according to claim 1, including a camera device for monitoring the combustion and in which the sleeve has such dimensions and the further means for making the end of the sleeve remote from the wall accessible is arranged so as to permit the introduction into the sleeve about to the inner end thereof, of said cameral device.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |