EP0314946A1 - Closure means for industrial ovens - Google Patents
Closure means for industrial ovens Download PDFInfo
- Publication number
- EP0314946A1 EP0314946A1 EP88116880A EP88116880A EP0314946A1 EP 0314946 A1 EP0314946 A1 EP 0314946A1 EP 88116880 A EP88116880 A EP 88116880A EP 88116880 A EP88116880 A EP 88116880A EP 0314946 A1 EP0314946 A1 EP 0314946A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- furnace
- door
- heat protection
- protection door
- heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000009413 insulation Methods 0.000 claims abstract description 14
- 239000011810 insulating material Substances 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/18—Door frames; Doors, lids, removable covers
- F27D1/1858—Doors
Definitions
- the invention relates to a furnace closure for industrial furnaces, consisting of a lockable furnace door on the furnace housing and a heat protection door attached to the inside of the furnace door made of a thermal insulating material, which seals the thermal insulation of the furnace interior gas-tight.
- Industrial furnaces for heat treatment or gas treatment of workpieces normally consist of a cylindrical pressure housing, one side of which is provided with an oven lock in the form of an oven door for loading and unloading the batches of workpieces to be treated.
- the heated batch chamber which is shielded from the outside by thermal insulation, usually in the form of a cylindrical tube made of graphite felt or graphite laminate with lids, the insulating lid of which must also be removable, namely for loading and unloading and for gas circulation during the treatment process in the oven.
- the insulating cover has to seal particularly well against the thermal furnace insulation in order to avoid buoyant flows of the gas between the heating chamber and the cold housing wall.
- the oven lock usually consists of an oven door fitted to the oven housing and an attached to it Heat protection door, which seals the thermal insulation of the furnace as an insulating cover. It is usually closed by means of a bayonet lock, so that the oven lock must be rotated by 15 to 30 ° each time the oven is closed and opened. Since the heat protection door is pressed onto the thermal insulation, there is a frictional removal of the insulating material in the sealing zone each time the furnace is opened and closed, so that after some time the thermal insulation of the furnace becomes leaky and must be repaired.
- High-pressure sintering furnaces usually have a graphite muffle inside the thermal insulation, which must also be sealed with a lid.
- the threaded spindle can advantageously be actuated from the outside of the furnace.
- the inner muffle door is attached to the inside of the heat protection door via axially displaceable guide pins that penetrate the heat protection door, and the heads of the guide pins are in contact with leaf springs additionally attached to the central threaded hub for the purpose of pressure on the furnace inner muffle.
- the distance between the furnace door and the heat protection door or inner muffle door can be set so that when the furnace door is closed in the bayonet lock there is no friction between the heat protection door and thermal insulation or the inner muffle door and inner muffle and therefore no material is removed. Friction removal of the insulating material can be avoided or minimized even more reliably if the heat-proof door is not closed tightly after the furnace door has been closed by actuating the threaded spindle from the outside.
- the contact pressure can be adjusted by the number and the spring properties of the leaf springs. They can consist of spring steel or graphite fiber reinforced carbon.
- the resilient pressing of the heat protection door or the inner muffle door has the further advantage that thermal expansion can be easily compensated for.
- the figure shows schematically a longitudinal section through an exemplary embodiment of the furnace closure according to the invention, the upper part showing the furnace closure with the heat protection door open and the lower part of the figure showing the furnace closure with the heat protection door and inner muffle door closing tightly.
- the oven consists of an oven housing (1) which is closed with an oven door (2).
- the heat protection door (5) is fastened to the furnace door (2) by means of leaf springs (3) and a central thread hub (4) by screwing the thread hub (4) onto the threaded spindle (6), which is located on the furnace door (2) and can be operated from the outside by means of an actuating device (7).
- the leaf springs (3) are attached to brackets (8) on the outer edge of the heat protection door (5).
- the leaf springs (3) press the heat protection door (5) onto the thermal insulation (9) of the furnace and thereby seal the furnace interior gas-tight.
- the inner muffle door (11), which seals the inner muffle (12), is fastened to the heat protection door (5) via guide pins (10).
- the inner muffle door (11) is pressed on via additional leaf springs (13) which are in contact with the heads (14) of the guide pins (10).
- the contact pressure of the heat protection door can be easily adjusted.
- the heat protection door (5) is lifted off the thermal insulation (9) with the actuating device (7).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
- Furnace Details (AREA)
Abstract
Description
Die Erfindung betrifft einen Ofenverschluß für Industrieöfen, bestehend aus einer am Ofengehäuse verriegelbaren Ofentür und einer an der Innenseite der Ofentür befestigten Wärmeschutztür aus einem thermischen Isoliermaterial, die die thermische Isolierung des Ofeninnenraums gasdicht abschließt.The invention relates to a furnace closure for industrial furnaces, consisting of a lockable furnace door on the furnace housing and a heat protection door attached to the inside of the furnace door made of a thermal insulating material, which seals the thermal insulation of the furnace interior gas-tight.
Industrieöfen zur Wärmebehandlung oder zur Gasbehandlung von Werkstücken bestehen normalerweise aus einem zylindrischen Druckgehäuse, dessen eine Seite zum Be- und Entladen der zu behandelnden Werkstückchargen mit einem Ofenverschluß in Form einer Ofentür versehen ist. Innerhalb des Ofens befindet sich die beheizte Chargenkammer, die nach außen durch eine thermische Isolierung abgeschirmt ist, zumeist in Form eines mit Deckeln versehenen zylindrischen Rohrs aus Graphitfilz oder Graphitlaminat, dessen einer Isolierdeckel ebenfalls entfernbar sein muß, nämlich zum Be- und Entladen und zur Gasumwälzung während des Behandlungsablaufs im Ofen.Industrial furnaces for heat treatment or gas treatment of workpieces normally consist of a cylindrical pressure housing, one side of which is provided with an oven lock in the form of an oven door for loading and unloading the batches of workpieces to be treated. Inside the furnace is the heated batch chamber, which is shielded from the outside by thermal insulation, usually in the form of a cylindrical tube made of graphite felt or graphite laminate with lids, the insulating lid of which must also be removable, namely for loading and unloading and for gas circulation during the treatment process in the oven.
Bei Vakuumkammeröfen, insbesondere bei Hochdruckkammeröfen, welche in der Heiz- und in der Kühlphase mit hohem Gasdruck gefahren werden, muß der Isolierdeckel besonders gut gegen die thermische Ofenisolierung dichten, um Auftriebsströmungen des Gases zwischen Heizraum und kalter Gehäusewand zu vermeiden.In vacuum chamber furnaces, especially in high-pressure chamber furnaces, which are operated with high gas pressure in the heating and cooling phases, the insulating cover has to seal particularly well against the thermal furnace insulation in order to avoid buoyant flows of the gas between the heating chamber and the cold housing wall.
Der Ofenverschluß besteht normalerweise aus einer dem Ofengehäuse angepassten Ofentür und einer daran angebrachten Wärmeschutztür, die als Isolierdeckel die thermische Isolierung des Ofens abdichtet. Das Verschließen erfolgt meist mittels eines Bajonettverschlusses, so daß der Ofenverschluß beim Schließen und Öffnen des Ofens jeweils um 15 bis 30 ° gedreht werden muß. Da dabei die Wärmeschutztür auf die thermische Isolierung gepreßt wird, erfolgt bei jedem Öffnen und Schließen des Ofens ein Reibungsabtrag des Isoliermaterials in der Dichtungszone, so daß nach einiger Zeit die thermische Isolierung des Ofens undicht wird und ausgebessert werden muß.The oven lock usually consists of an oven door fitted to the oven housing and an attached to it Heat protection door, which seals the thermal insulation of the furnace as an insulating cover. It is usually closed by means of a bayonet lock, so that the oven lock must be rotated by 15 to 30 ° each time the oven is closed and opened. Since the heat protection door is pressed onto the thermal insulation, there is a frictional removal of the insulating material in the sealing zone each time the furnace is opened and closed, so that after some time the thermal insulation of the furnace becomes leaky and must be repaired.
Hochdrucksinteröfen besitzen zumeist innerhalb der thermischen Isolierung eine Graphitmuffel, die ebenfalls mit einem Deckel abgedichtet werden muß.High-pressure sintering furnaces usually have a graphite muffle inside the thermal insulation, which must also be sealed with a lid.
Es war daher Aufgabe der vorliegenden Erfindung, einen Ofenverschluß für Industrieöfen zu entwickeln, bestehend aus einer am Ofengehäuse verriegelbaren Ofentür und einer an der Innenseite der Ofentür befestigten Wärmeschutztür aus einem thermischen Isoliermaterial, die die thermische Isolierung des Ofeninnenraums gasdicht abschließt, ohne daß es zu einem merklichen Reibungsabtrag zwischen Wärmeschutztür und thermischer Isolierung beim Öffnen und Schließen des Ofens kommt.It was therefore an object of the present invention to develop a furnace closure for industrial furnaces, consisting of a furnace door which can be locked on the furnace housing and a heat protection door which is fastened to the inside of the furnace door and is made of a thermal insulating material and which seals the thermal insulation of the furnace interior in a gas-tight manner without it becoming one noticeable friction loss between the heat protection door and thermal insulation when opening and closing the furnace.
Diese Aufgabe wird erfindungs gemäß dadurch gelöst, daß auf der Außenseite der Wärmeschutztür am Randbereich mehrere Blattfedern befestigt sind, die zentrisch in einer zentralen Gewindenabe zusammenlaufen, und daß die Gewindenabe auf einer zentral auf der Innenseite der Ofentür befestigten Gewindespindel aufgeschraubt ist.This object is achieved according to the In that a plurality of leaf springs are attached to the outside of the thermal door at the edge area, which converge centrally in a central threaded hub, and that the threaded hub is screwed onto a threaded spindle fixed centrally on the inside of the oven door.
Vorteilhafterweise ist die Gewindespindel von der Ofenaußenseite aus betätigbar.The threaded spindle can advantageously be actuated from the outside of the furnace.
Bei Hochdrucksinteröfen mit einer Graphitmuffel ist es weiterhin vorteilhaft die Innenmuffeltür an der Wärmeschutztür über Federn zu befestigen. Dazu ist an der Innenseite der Wärmeschutztür über axial verschiebbare, die Wärmeschutztür durchdringende Führungsstifte die Innenmuffeltür angebracht, und die Köpfe der Führungsstifte stehen zwecks Anpressung an die Ofeninnenmuffel mit zusätzlich an der zentralen Gewindenabe befestigten Blattfedern in Berührung.In high-pressure sintering furnaces with a graphite muffle, it is also advantageous to attach the inner muffle door to the heat protection door using springs. For this purpose, the inner muffle door is attached to the inside of the heat protection door via axially displaceable guide pins that penetrate the heat protection door, and the heads of the guide pins are in contact with leaf springs additionally attached to the central threaded hub for the purpose of pressure on the furnace inner muffle.
Durch die Lage der Gewindenabe auf der Gewindespindel kann der Abstand zwischen Ofentür und Wärmeschutztür bzw. Innenmuffeltür so eingestellt werden, daß beim Verschließen der Ofentür im Bajonettverschluß keine Reibung zwischen Wärmeschutztür und thermischer Isolierung bzw. Innenmuffeltür und Innenmuffel auftritt und somit kein Materialabtrag stattfindet. Noch sicherer läßt sich eine Reibabtragung des Isoliermaterials vermeiden bzw. minimieren, wenn man das dichte Schließen der Wärmeschutztür erst nach dem Verschließen der Ofentür durch Betätigen der Gewindespindel von außen bewerkstelligt. Die Anpreßkraft kann durch die Zahl und die Federeigenschaften der Blattfedern eingestellt werden. Sie können aus Federstahl oder auch aus graphitfaserverstärktem Kohlenstoff bestehen. Das federnde Anpressen der Wärmeschutztür bzw. der Innenmuffeltür hat den weiteren Vorteil, daß Wärmedehnungen leicht ausgeglichen werden können.Due to the position of the threaded hub on the threaded spindle, the distance between the furnace door and the heat protection door or inner muffle door can be set so that when the furnace door is closed in the bayonet lock there is no friction between the heat protection door and thermal insulation or the inner muffle door and inner muffle and therefore no material is removed. Friction removal of the insulating material can be avoided or minimized even more reliably if the heat-proof door is not closed tightly after the furnace door has been closed by actuating the threaded spindle from the outside. The contact pressure can be adjusted by the number and the spring properties of the leaf springs. They can consist of spring steel or graphite fiber reinforced carbon. The resilient pressing of the heat protection door or the inner muffle door has the further advantage that thermal expansion can be easily compensated for.
Die Abbildung zeigt schematisch einen Längsschnitt durch eine beispielhafte Ausführungsform des erfindungsgemäßen Ofenverschlußes, wobei der obere Teil den Ofenverschluß mit geöffneter Wärmeschutztür und der untere Teil der Abbildung den Ofenverschluß mit dicht schließender Wärmeschutztür und Innenmuffeltür wiedergibt.The figure shows schematically a longitudinal section through an exemplary embodiment of the furnace closure according to the invention, the upper part showing the furnace closure with the heat protection door open and the lower part of the figure showing the furnace closure with the heat protection door and inner muffle door closing tightly.
Der Ofen besteht aus einem Ofengehäuse (1), das mit einer Ofentür (2) verschlossen ist. An der Ofentür (2) ist über Blattfedern (3) und einer zentralen Gewindenabe (4) die Wärmeschutztür (5) befestigt, indem die Gewindenabe (4) auf die Gewindespindel (6) aufgeschraubt ist, die sich an der Ofentür (2) befindet und mittels einer Betätigungsvorrichtung (7) von außen bedient werden kann. Die Blattfedern (3) sind auf Bügeln (8) am äußeren Rand der Wärmeschutztür (5) befestigt. Die Blattfedern (3) pressen je nach Stand der Gewindenabe (4) auf der Gewindespindel (6) die Wärmeschutztür (5) auf die thermische Isolierung (9) des Ofens und dichten damit das Ofeninnere gasdicht ab. An der Wärmeschutztür (5) ist über Führungsstifte (10) die Innenmuffeltür (11) befestigt, die die Innenmuffel (12) abdichtet. Das Anpressen der Innenmuffeltür (11) erfolgt über zusätzliche Blattfedern (13), die in Berührung mit den Köpfen (14) der Führungsstifte (10) stehen.The oven consists of an oven housing (1) which is closed with an oven door (2). The heat protection door (5) is fastened to the furnace door (2) by means of leaf springs (3) and a central thread hub (4) by screwing the thread hub (4) onto the threaded spindle (6), which is located on the furnace door (2) and can be operated from the outside by means of an actuating device (7). The leaf springs (3) are attached to brackets (8) on the outer edge of the heat protection door (5). Depending on the position of the thread hub (4) on the threaded spindle (6), the leaf springs (3) press the heat protection door (5) onto the thermal insulation (9) of the furnace and thereby seal the furnace interior gas-tight. The inner muffle door (11), which seals the inner muffle (12), is fastened to the heat protection door (5) via guide pins (10). The inner muffle door (11) is pressed on via additional leaf springs (13) which are in contact with the heads (14) of the guide pins (10).
Durch Hinein- und Herausdrehen der Gewindenabe (4) auf der Gewindespindel (6) kann der Anpreßdruck der Wärmeschutztür einfach eingestellt werden. In der Ofenkühlphase wird mit der Betätigungsvorrichtung (7) die Wärmeschutztür (5) von der thermischen Isolierung (9) abgehoben.By turning the threaded hub (4) on and off the threaded spindle (6), the contact pressure of the heat protection door can be easily adjusted. In the furnace cooling phase, the heat protection door (5) is lifted off the thermal insulation (9) with the actuating device (7).
Claims (3)
dadurch gekennzeichnet,
daß auf der Außenseite der Wärmeschutztür (5) am Randbereich mehrere Blattfedern (3) befestigt sind, die zentrisch in einer zentralen Gewindenabe (4) zusammenlaufen, und daß die Gewindenabe (4) auf einer zentral auf der Innenseite der Ofentür (2) befestigten Gewindespindel (6) aufgeschraubt ist.1. Furnace lock for industrial furnaces, consisting of a furnace door that can be locked on the furnace housing and a thermal protection door attached to the inside of the furnace door and made of a thermal insulating material that seals the thermal insulation of the furnace interior gas-tight,
characterized,
that on the outside of the heat protection door (5) at the edge region a plurality of leaf springs (3) are fastened, which converge centrally in a central threaded hub (4), and that the threaded hub (4) is mounted on a threaded spindle which is fastened centrally on the inside of the furnace door (2) (6) is screwed on.
dadurch gekennzeichnet,
daß die Gewindespindel (6) über eine Betätigungsvorrichtung (7) von der Ofenaußenseite aus bedienbar ist.2. furnace closure according to claim 1,
characterized,
that the threaded spindle (6) can be operated via an actuating device (7) from the outside of the furnace.
dadurch gekennzeichnet,
daß an der Innenseite der Wärmeschutztür (5) über axial verschiebbare, die Wärmeschutztür (5) durchdringende Führungsstifte (10) eine Innenmuffeltür (11) angebracht ist, und die Köpfe (14) der Führungsstifte (10) zwecks Anpressung an eine Innenmuffel (12) mit zusätzlich an der Gewindenabe (4) befestigten Blattfedern (13) in Berührung stehen.3. furnace closure according to claim 1 and 2,
characterized,
that an inner muffle door (11) is attached to the inside of the heat protection door (5) via axially displaceable guide pins (10) penetrating the heat protection door (5), and the heads (14) of the guide pins (10) for pressing against an inner muffle (12) with leaf springs (13) attached to the thread hub (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88116880T ATE67841T1 (en) | 1987-10-31 | 1988-10-12 | FURNACE CAP FOR INDUSTRIAL FURNACES. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8714544U DE8714544U1 (en) | 1987-10-31 | 1987-10-31 | Furnace closure for industrial furnaces |
| DE8714544U | 1987-10-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0314946A1 true EP0314946A1 (en) | 1989-05-10 |
| EP0314946B1 EP0314946B1 (en) | 1991-09-25 |
Family
ID=6813646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88116880A Expired - Lifetime EP0314946B1 (en) | 1987-10-31 | 1988-10-12 | Closure means for industrial ovens |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4883002A (en) |
| EP (1) | EP0314946B1 (en) |
| AT (1) | ATE67841T1 (en) |
| DE (2) | DE8714544U1 (en) |
| ES (1) | ES2024610B3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0460484A2 (en) * | 1990-06-05 | 1991-12-11 | Balzers-Pfeiffer GmbH | Closure device for a heat treatment installation |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2639097A1 (en) * | 1988-11-17 | 1990-05-18 | Bourgeois Ste Coop Production | DOUBLE DOOR OVEN |
| US5449289A (en) * | 1992-06-15 | 1995-09-12 | Semitool, Inc. | Semiconductor processor opening and closure construction |
| US5302120A (en) * | 1992-06-15 | 1994-04-12 | Semitool, Inc. | Door assembly for semiconductor processor |
| US5803021A (en) * | 1994-10-11 | 1998-09-08 | Combustion Engineering, Inc. | Boiler access door construction |
| US5720855A (en) * | 1996-05-14 | 1998-02-24 | Saturn Machine & Welding Co. Inc. | Coke oven door |
| WO1998016781A1 (en) * | 1996-10-15 | 1998-04-23 | Reliability Incorporated | Expandable panel for environmentally controllable chamber |
| US6729245B2 (en) * | 2000-02-17 | 2004-05-04 | Kenneth D. Clark | Fill door having angled movement |
| US6609908B2 (en) * | 2001-11-13 | 2003-08-26 | Ets Schaefer Corporation | Replaceable heater cover |
| PL213246B1 (en) * | 2009-02-12 | 2013-02-28 | Seco Warwick Spolka Akcyjna | Retort furnace for heat tratment and for thermochemical treatment |
| EP2426321A1 (en) * | 2010-09-03 | 2012-03-07 | Siemens Aktiengesellschaft | Casing for a gas turbine |
| US10023954B2 (en) * | 2011-09-15 | 2018-07-17 | Applied Materials, Inc. | Slit valve apparatus, systems, and methods |
| CN107575885A (en) * | 2017-07-25 | 2018-01-12 | 盐城美希密封件有限公司 | A kind of convenient sealing fire door opened and closed |
| CN110514012A (en) * | 2019-09-09 | 2019-11-29 | 斯默因热能科技(杭州)有限公司 | A kind of sealing device of overlength fire door |
| CN112263973B (en) * | 2020-11-05 | 2024-10-01 | 重庆市机电设计研究院有限公司 | Preparation equipment and preparation process for photocatalytic ceramic pellets |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR727476A (en) * | 1930-12-12 | 1932-06-18 | Door closing of heat treatment ovens | |
| FR931786A (en) * | 1945-09-12 | 1948-03-03 | Semet Solvay Co | Improvements to self-closing coke oven doors |
| US3055321A (en) * | 1958-11-24 | 1962-09-25 | Babcock & Wilcox Co | Access door |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2953998A (en) * | 1957-08-08 | 1960-09-27 | Thomas C Pew | Heat treating apparatus |
| US3990950A (en) * | 1973-09-06 | 1976-11-09 | Bloom Engineering Company, Inc. | Leveler door for coke ovens |
| US4121383A (en) * | 1977-07-11 | 1978-10-24 | Perry Oceanographics, Inc. | Closure mechanism for a door |
| US4216062A (en) * | 1979-02-05 | 1980-08-05 | United States Steel Corporation | Sealing means for a coke oven chuck door |
| DE2939070C2 (en) * | 1979-09-27 | 1982-10-07 | Ateliers Louis Carton S.A., Tournai | Coke oven door |
| DE3307844A1 (en) * | 1983-03-05 | 1984-09-06 | Krupp-Koppers Gmbh, 4300 Essen | COOKING OVEN DOOR |
| DE3311183C2 (en) * | 1983-03-26 | 1987-04-02 | Carl Still Gmbh & Co Kg, 4350 Recklinghausen | Coke oven door with sealing membrane plate |
| US4647343A (en) * | 1984-05-03 | 1987-03-03 | Wsw Planungs - Gmbh | Self sealing coke oven door of lightweight construction |
| US4534488A (en) * | 1984-11-21 | 1985-08-13 | Boggs John A | Locking device for garbage can lid |
| US4596197A (en) * | 1985-01-10 | 1986-06-24 | Raymond Kaiser Engineers Inc. | Coke oven door |
-
1987
- 1987-10-31 DE DE8714544U patent/DE8714544U1/en not_active Expired
-
1988
- 1988-10-12 DE DE8888116880T patent/DE3865174D1/en not_active Expired - Lifetime
- 1988-10-12 AT AT88116880T patent/ATE67841T1/en not_active IP Right Cessation
- 1988-10-12 EP EP88116880A patent/EP0314946B1/en not_active Expired - Lifetime
- 1988-10-12 ES ES88116880T patent/ES2024610B3/en not_active Expired - Lifetime
- 1988-10-24 US US07/261,403 patent/US4883002A/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR727476A (en) * | 1930-12-12 | 1932-06-18 | Door closing of heat treatment ovens | |
| FR931786A (en) * | 1945-09-12 | 1948-03-03 | Semet Solvay Co | Improvements to self-closing coke oven doors |
| US3055321A (en) * | 1958-11-24 | 1962-09-25 | Babcock & Wilcox Co | Access door |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0460484A2 (en) * | 1990-06-05 | 1991-12-11 | Balzers-Pfeiffer GmbH | Closure device for a heat treatment installation |
| EP0460484A3 (en) * | 1990-06-05 | 1992-02-26 | Arthur Pfeiffer Vakuumtechnik Wetzlar Gmbh | Closure device for a heat treatment installation |
| US5193998A (en) * | 1990-06-05 | 1993-03-16 | Arthur Pfeiffer Vakuumtechnik Wetzlar Gmbh | Sealing arrangement for heat treatment apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3865174D1 (en) | 1991-10-31 |
| US4883002A (en) | 1989-11-28 |
| ES2024610B3 (en) | 1992-03-01 |
| DE8714544U1 (en) | 1987-12-23 |
| EP0314946B1 (en) | 1991-09-25 |
| ATE67841T1 (en) | 1991-10-15 |
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