US3598381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous carburizing furnace
Assignee: Holcroft and Co
•
Filing: 1969-02-26
•
Granted: 1971-08-10
•
Expires: 1989-02-26
Abstract
Abstract A continuous carburizing furnace comprising a heating chamber having inlet door means through which, when open, work can be fed into the chamber, a carburizing chamber, interconnecting door means between the chambers through which, when open, work can be fed from the heating chamber to the carburizing chamber, first feeding means for feeding work fed into the heating chamber into a transfer position within said chamber, second feeding means for feeding work from the transfer position through the interconnecting door means when open to a feed position in the carburizing chamber, third feeding means for feeding work from the feed position towards outlet door means of the furnace and means for operating the interconnecting door means when at least the inlet door means are closed.
Inventors
- 👤 Donald J Schwalm
- 👤 Edward C Bayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:58
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
186 words
A continuous carburizing furnace comprising a heating chamber containing a noncarburizing gaseous atmosphere which prevents scaling or decarburization, inlet door means through which, when open, work can be fed into said heating chamber, a carburizing chamber containing a carburizing atmosphere, a diffusion chamber at the outlet end of said carburizing chamber containing an atmosphere adjusted to be in equilibrium with the desired carbon content in the surface of the work, interconnecting door means between the chambers through which, when open, work can be fed from the heating chamber to the carburizing chamber, first feeding means for feeding work fed into the heating chamber into a transfer position within said chamber, second feeding means for feeding work from the transfer position through the interconnecting door means when open to a feed position in the carburizing chamber, third feeding means for feeding work from the feed position towards outlet door means of the furnace and means for operating the interconnecting door means when at least the inlet door means are closed, said feeding means and said door-operating means being automatically operable at predetermined times throughout a treatment cycle.
Claim 2
Dependent Claim
186 words
A continuous carburizing furnace comprising a heating chamber containing a noncarburizing gaseous atmosphere which prevents scaling or decarburization, inlet door means through which, when open, work can be fed into said heating chamber, a carburizing chamber containing a carburizing atmosphere, a diffusion chamber at the outlet end of said carburizing chamber containing an atmosphere adjusted to be in equilibrium with the desired carbon content in the surface of the work, interconnecting door means between the chambers through which, when open, work can be fed from the heating chamber to the carburizing chamber, first feeding means for feeding work fed into the heating chamber into a transfer position within said chamber, second feeding means for feeding work from the transfer position through the interconnecting door means when open to a feed position in the carburizing chamber, third feeding means for feeding work from the feed position towards outlet door means of the furnace and means for operating the interconnecting door means when at least the inlet door means are closed, said feeding means and said door-operating means being automatically operable at predetermined times throughout a treatment cycle.
Claim 3
Dependent Claim
50 words
A furnace according to claim 1 wherein said outlet door means are situated at an outlet of said diffusing chamber which is in constant communication with said carburizing chamber, the operating means for said interconnecting door means being operable when both said inlet and said outlet door means are closed.
Claim 4
Dependent Claim
110 words
A furnace according to claim 1 wherein the outlet door means are situated at the outlet of a diffusing chamber which is separated from the carburizing chamber by a second interconnecting door means, the latter being provided with operating means operable when the outlet door means are closed, and when either one or both of the first said interconnecting dooR means and the inlet door means are closed, there being further provided a fourth feed means to feed work from the carburizing chamber into the diffusing chamber through the second interconnecting door means, and a fifth feed means to feed work in the diffusing chamber towards the outlet door means.
Claim 5
Dependent Claim
53 words
A furnace according to claim 3, wherein the heating chamber and the carburizing chamber are arranged in generally parallel but transversely offset relation, and with the downstream end of the former overlapped longitudinally with the upstream end of the latter, to provide for communication between the two chambers through said interconnecting door means.
Claim 6
Dependent Claim
89 words
A furnace according to claim 4 wherein the first feeding means, second feeding means, and third feeding means each comprise a pusher device for engaging the work, or a work support, to advance same longitudinally of the heating chamber, in the case of the first feeding means, to advance same transversely of the heating chamber and the carburizing chamber through the interconnecting door means in the case of the second feeding means, and to advance same longitudinally of the carburizing chamber in the case of the third feeding means.
Claim 7
Dependent Claim
27 words
A furnace according to claim 4 wherein an access door means is provided to provide communication to the overlapping end sections of the heating and carburizing chambers.
Claim 8
Dependent Claim
52 words
A furnace according to claim 4 wherein the diffusing chamber is situated adjacent to the downstream end of the carburizing chamber, and in transversely offset relation thereto, and wherein said fourth feeding means comprises a pusher device for moving the work transversely of the carburizing chamber through said second interconnecting door means.
Claim 9
Dependent Claim
24 words
A furnace according to claim 7 wherein the fifth feeding means provided in said diffusing chamber is in the form of a rotary hearth.
Claim 10
Dependent Claim
132 words
A continuous carburizing furnace comprising heating and carburizing chambers through both of which work can be fed in a direction longitudinally of the chambers and which are arranged in generally parallel transversely offset relation to each other with the downstream end of the former adjacent to the upstream end of the latter; inlet, interconnecting, and outlet door means controlling communication into the heating chamber, between the chambers and out of the carburizing chamber respectively; and first, second and third feeding means for continuously feeding the work through the heating chamber, therefrom to the carburizing chamber and through the carburizing chamber respectively; and a control system coordinating operation of the door means and feeding means to maintain at least one of said door means closed at any given instant in the feeding cycle.
Claim 11
Dependent Claim
132 words
A continuous carburizing furnace comprising heating and carburizing chambers through both of which work can be fed in a direction longitudinally of the chambers and which are arranged in generally parallel transversely offset relation to each other with the downstream end of the former adjacent to the upstream end of the latter; inlet, interconnecting, and outlet door means controlling communication into the heating chamber, between the chambers and out of the carburizing chamber respectively; and first, second and third feeding means for continuously feeding the work through the heating chamber, therefrom to the carburizing chamber and through the carburizing chamber respectively; and a control system coordinating operation of the door means and feeding means to maintain at least one of said door means closed at any given instant in the feeding cycle.
Claim 12
Dependent Claim
46 words
A furnace according to claim 9 wherein the outlet door means are situated at an outlet of a diffusing chamber communicating with the carburizing chamber, the operating means for the interconnecting door means being operable when both the inlet and the outlet door means are closed.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |