US3836324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous rotary heat treating furnace
Assignee: American Gas Furnace Co
•
Filing: 1973-08-06
•
Granted: 1974-09-17
•
Expires: 1993-08-06
Abstract
Abstract A continuous rotary heat treating furnace including a furnace housing defining a heating chamber therein, and a cylindrical furnace retort for conveying work through the furnace, the retort being mounted for for rotation within the heating chamber. A circumferential collar is mounted in gas sealing relationship to, and extends about the periphery of the furnace rotort near the discharge end thereof. The collar extends radially beyond the circumference of the furnace housing, to preclude gaseous communication between the discharge end of the retort and the heating chamber. Roller support means underlie the furnace housing, and engage with the periphery of the collar. An axially displaceable cylindrical sub-assembly, closed at one end by a heating chamber, approximately mates with the side of the collar facing the discharge end of the retort and includes spring biased sealing means perfecting the gas seal of the heating chamber. A downwardly directed opening in the sub-assembly permits the work passing from the retort, to drop directly through the subassembly to an underlying quench tank or the like.
Inventors
- 👤 F Shaefer
- 👤 F Korzeb
- 👤 W Bayly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:09
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/0031; F; F27; F27B; F27B7/00; F27B7/08; F27B7/20; F27B7/22; F27B7/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
208 words
A continuous rotary heat treating furnace, comprising in combination: a furnace housing defining a heating chamber therein; a cylindrical furnace retort mounted for rotation within said heating chamber, said retort having a work input and a work discharge end; roller support means underlying said furnace housing near the discharge end of said retort; a circumferential collar mounted in gas sealing relationship with and extending about the periphery of said retort at an axial position near the discharge end thereof, said discharge end protruding beyond all axial points of said collar, said collar having a portion extending radially beyond the circumference of said housing, and engaging said underlying support means; a discharge chute, the upper end of said chute being located proximate to and directly beneath the discharge end of the retort, whereby the work discharged from said retort is permitted to fall unimpededly through said chute; gas sealing means at least partially sealing with said collar portion to preclude gaseous communication between the discharge end of said retort and said heating chamber; means for loading work at said input end of said retort and conveying said work through said retort for discharge at the discharge end thereof; and means for rotating said retort, together with said rollersupported collar.
Claim 2
Dependent Claim
208 words
A continuous rotary heat treating furnace, comprising in combination: a furnace housing defining a heating chamber therein; a cylindrical furnace retort mounted for rotation within said heating chamber, said retort having a work input and a work discharge end; roller support means underlying said furnace housing near the discharge end of said retort; a circumferential collar mounted in gas sealing relationship with and extending about the periphery of said retort at an axial position near the discharge end thereof, said discharge end protruding beyond all axial points of said collar, said collar having a portion extending radially beyond the circumference of said housing, and engaging said underlying support means; a discharge chute, the upper end of said chute being located proximate to and directly beneath the discharge end of the retort, whereby the work discharged from said retort is permitted to fall unimpededly through said chute; gas sealing means at least partially sealing with said collar portion to preclude gaseous communication between the discharge end of said retort and said heating chamber; means for loading work at said input end of said retort and conveying said work through said retort for discharge at the discharge end thereof; and means for rotating said retort, together with said rollersupported collar.
Claim 3
Dependent Claim
110 words
Apparatus in accordance with claim 1, further including a sub-assembly having a heated portion closing one end thereof, and open at the opposite end thereof, said sub-assembly being mounted for axial displacement toward and away from the discharge end of said retort and furnace housing, the walls of said sub-assembly being adapted to approximately mate with the side of said collar toward said discharge end of said retort; said sub-assembly including an unobstructed downwardly directed opening beneath the discharge end of said retort when said sub-assembly is engaged with said collar, permitting said work to drop in unimpeded fashion through said sub-assembly and discharge opening to an underlying receiving point.
Claim 4
Dependent Claim
14 words
Apparatus in accordance with claim 2, wherein said sub-assembly carries said gas sealing means.
Claim 5
Dependent Claim
44 words
Apparatus in accordance with claim 3, wherein said gas sealing means comprises biased sealing rings mounted at the periphery of said sub-assembly, adapted for sealing engagement with the opposing face of said collar when said sub-assembly is axially positioned adjacent said retort and furnace.
Claim 6
Dependent Claim
15 words
Apparatus in accordance with claim 4, wherein said sub-assembly is track-mounted for said axial movement.
Claim 7
Dependent Claim
13 words
Apparatus in accordance with claim 4, wherein said heating chamber is gas heated.
Claim 8
Dependent Claim
14 words
Apparatus in accordance with claim 4, wherein said cylindrical heating chamber is electrically heated.
Claim 9
Dependent Claim
44 words
Apparatus in accordance with claim 4, wherein said roller means includes at least a pair of rollers mounted on axes parallel to the axis of said retort and chamber, said rollers engaging said collar at a flange formed about the periphery of said collar.
Claim 10
Dependent Claim
36 words
Apparatus in accordance with claim 8, wherein said roller means further includes thrust rollers, rotatable on axes radially directed with respect to said retort and furnace, said thrust rollers engaging the lateral faces of said collar.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |