DE1584644B1 - Lifting table for a vertical extrusion press for the production of ceramic socket pipes - Google Patents
Lifting table for a vertical extrusion press for the production of ceramic socket pipesInfo
- Publication number
- DE1584644B1 DE1584644B1 DE19641584644 DE1584644A DE1584644B1 DE 1584644 B1 DE1584644 B1 DE 1584644B1 DE 19641584644 DE19641584644 DE 19641584644 DE 1584644 A DE1584644 A DE 1584644A DE 1584644 B1 DE1584644 B1 DE 1584644B1
- Authority
- DE
- Germany
- Prior art keywords
- gas pressure
- pressure accumulator
- lifting table
- cylinder
- lifting
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/52—Methods or machines specially adapted for the production of tubular articles by extruding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/52—Methods or machines specially adapted for the production of tubular articles by extruding
- B28B21/54—Mouthpieces for shaping sockets, bends, or like peculiarly-shaped tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/0052—Details of, or accessories for, presses; Auxiliary measures in connection with pressing for fluid driven presses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/405—Flow control characterised by the type of flow control means or valve
- F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
- F15B2211/41572—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and an output member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/40—Flow control
- F15B2211/42—Flow control characterised by the type of actuation
- F15B2211/421—Flow control characterised by the type of actuation mechanically
- F15B2211/423—Flow control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
- F15B2211/50527—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves using cross-pressure relief valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5158—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and an output member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/52—Pressure control characterised by the type of actuation
- F15B2211/521—Pressure control characterised by the type of actuation mechanically
- F15B2211/523—Pressure control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7053—Double-acting output members
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Description
Die Erfindung betrifft einen Hubtisch für eine vertikal arbeitende Strangpresse zum Herstellen von keramischen-Muffenrohren, der durch ein mit einem Druckmittel beaufschlagbares- Kolben=Zylinder-Aggregat bewegt wird.The invention relates to a lifting table for a vertically working Extrusion press for the production of ceramic socket pipes, which is connected by a Pressure medium can be acted upon - piston = cylinder unit is moved.
Bei solchen Hubtischen spielt, da die Tischbewegung beim Pressen unbedingt synchron mit der Geschwindigkeit des aus dem Pressenmundstück austretenden Rohrstranges sein muß, der Gewichtsausgleich eine große Rolle.With such lifting tables, the table movement during pressing is essential synchronized with the speed of the pipe string emerging from the press nozzle must be, weight balancing plays a major role.
Aus der britischen Patentschrift' 673 357 ist ein Hubtisch der vorerwähnten Art bekannt,. -bei dem das Kolben-Zylinder-Aggregat einen Hauptzylinder und einen Hilfszylinder aufweist und bei dem primär ein hydraulisches Druckmittel verwendet wird. Zur Steuerung der Hub- und Senkbewegung- des Tisches und zum Gewichtsausgleich ist eine aufwendige,.mehrege pneumatisch-hydraulische Ventile aufweisende Steuerung vorgesehen.From British patent specification '673 357 a lift table is of the type mentioned above Kind known. -in which the piston-cylinder unit has a master cylinder and a Has auxiliary cylinder and primarily uses a hydraulic pressure medium will. For controlling the lifting and lowering movement of the table and for weight compensation is a complex, .mehrge pneumatic-hydraulic valves having control intended.
Aufgabe der Erfindung, ist es, einen solchen Hubtisch bei einwandfreiem Gewichtsausgleich in seinem Gesamtaufbau zu vereinfachen und insbesondere komplizierte Steuereinrichtungen überflüssig zu machen.The object of the invention is to provide such a lifting table in perfect condition To simplify weight compensation in its overall structure and in particular complicated To make control devices superfluous.
Das wird gemäß der Erfindung dadurch erreicht, daß bei einem Hubtisch der eingangs angegebenen Art das Kolben-Zylinder-Aggregat zum Heben und Senken des Hubtisches doppeltwirkend ausgebildet ist, daß das Druckmittel der Heben-Seite gasförmig ist und diese Seite mit einem Gasdruckspeicher verbunden ist, dessen Vorspannung zum Ausgleich des Tischgewichtes einstellbar und dessen- Volumen in Anpassung an .das Gewicht der -Tisch-Auflast veränderbar ist, und daß die Senken Seite mit einem Druck zu beaufschlagen ist, der höher als der Höchstdruck des Gasdruckspeichers ist.This is achieved according to the invention in that in a lifting table of the type specified above, the piston-cylinder unit for raising and lowering the Lifting table is designed double-acting that the pressure medium of the lifting side is gaseous and this side is connected to a gas pressure accumulator whose preload to compensate for the table weight adjustable and its volume in adaptation to .The weight of the table load can be changed, and that the lowering side with a The pressure to be applied is higher than the maximum pressure of the gas pressure accumulator is.
Doppeltwirkende Kolben-Zylinder-Aggregate sind an sich bekannt; jedoch auf anderen Gebieten und unter anderer Verwendung.Double-acting piston-cylinder units are known per se; However in other areas and with different uses.
Der Aufbau des Hubtisches wird besonders einfach, wenn nach weiteren, -zusätzlichen Merkmalen der Erfindung die Kolbenstenge des Kolben-Zylinder-Aggregats raumfest und der Zylinder heb- und senkbar angeordnet sind. Zweckmäßigerweise ist dabei die Kolbenstange als Druckmittelleitung ausgebildet zum Verbinden der Heben-Seite des Zylinders mit dem Gasdruckspeicher.The construction of the lifting table is particularly easy if, after further, -additional features of the invention, the piston rod of the piston-cylinder unit Fixed in space and the cylinder can be raised and lowered. Is expedient the piston rod designed as a pressure medium line to connect the lifting side of the cylinder with the gas pressure accumulator.
Die- Erfindung ist nachfolgend an einem Ausführungsbeispiel näher erläutert. Es zeigt .The invention is explained in more detail below using an exemplary embodiment explained. It shows .
F i g. 1 die Anordnung bei in die obere Endstellung hochgefahrenem, nicht belastetem Hubtisch und F i g: 2 den Hubtisch in der unteren Endstellung. Der Hubtisch 10 sitzt auf dem -oberen Ende eines Rohres 11, das zwischen Rollen 12 vertikal geführt ist. Am unteren Ende bei 11 a ist das Rohr geschlossen; es bildet einen doppeltwirkenden Zylinder, in welchen ein Kolben 13 am oberen Ende eines rauenfest angeordneten, die Kolbenstange bildenden Rohres 14 eingebaut ist. Das Rohr 14 dient zum Zuführen von Druckluft zur Heben-Seite 11 b des Zylinders 11, während über eine biegsame Leitung 15 Druckluft zur Senken-Seite 11 c geführt wird. Die Druckluft wird einem gemeinsamen Netz 16 entnommen, und zwar führt eine Verzweigung 17 über ein Steuer-Einlaßventil 17 a zu einer im weiteren als Steuerleitung bezeichneten Leitung 15. Ferner ist die Steuerleitung. über eine Abzweigung 18 mit einem Ablaß-Drosselveütill&ä.-mit der Atmosphäre verbindbar. Die Ventile 17a und 18a beherrschen in noch zu: beschreibender Weise das Heben, Senken und: Anhalten des Hubtisches.F i g. 1 the arrangement with the raised to the upper end position, lift table not loaded and F i g: 2 the lift table in the lower end position. The lifting table 10 sits on the upper end of a tube 11, which is between rollers 12 is guided vertically. At the lower end at 11 a, the tube is closed; it forms a double-acting cylinder in which a piston 13 at the top of a rough-proof arranged, the piston rod forming tube 14 is installed. The tube 14 is used for supplying compressed air to the lifting side 11 b of the cylinder 11, while a flexible line 15 compressed air is guided to the lowering side 11 c. The compressed air is taken from a common network 16, namely a branch 17 leads over a control inlet valve 17 a to one referred to below as a control line Line 15. Also is the control line. via a junction 18 with a drain-Drosselveütill & Ä.-mit connectable to the atmosphere. The valves 17a and 18a dominate in yet to: descriptive How to raise, lower and: stop the lifting table.
Eine zweite Abzweigung 19 vom Druckluftnetz 16 teilt sich in die parallelen Leitungszweige 20 und 21. Der Zweig 20 führt über ein Absperrventil 22 in einen Gasdruckspeicher 23. Der Zweig 21 führt über ein Absperrventil 24 und ein Reduzierventü25 zum Kolbenstangenrohr 14, das auf der Oberseite des Kolbens 13 in die Heben-Seite 11 b des Zylinders 11 mündet. Eine Querverbindung 26 verbindet die Zweige 20 ur<d 21 hinter den Ventilen 22 bzw. 24/25.A second branch 19 from the compressed air network 16 divides into the parallel ones Line branches 20 and 21. The branch 20 leads via a shut-off valve 22 into one Gas pressure accumulator 23. Branch 21 leads via a shut-off valve 24 and a reducing valve 25 to the piston rod tube 14, which is on the top of the piston 13 in the lifting side 11 b of the cylinder 11 opens. A cross connection 26 connects the branches 20 ur <d 21 behind valves 22 or 24/25.
Das Volumen des Gasdruckspeichers 23 ist veränderbar durch Einfüllen bzw. Entleeren einer nichti kompressiblen Flüssigkeit 27, z. B. Öl, aus einem Behälter 28; die noch in diesem befindliche, im weiteren als Verdrängerflüssigkeit bezeichnete Flüssigkeit ist mit 27 a bezeichnet. Ein Ventil 29 dient zum Absperren einer Verbindungsleitung 30 zwischen dem Behälter 28 und dem Gasdruckspeicher 23. Schließlich ist im Leitungszweig 20 zwischen Ventil 22 und Gasdruckspeicher_ 23 ein Entlüftungsventil 31 vorgesehen.The volume of the gas pressure accumulator 23 can be changed by filling it or emptying a non-compressible liquid 27, z. B. oil, from a container 28; which is still in this, hereinafter referred to as the displacement liquid Liquid is denoted by 27 a. A valve 29 is used to shut off a connecting line 30 between the container 28 and the gas pressure accumulator 23. Finally, it is in the line branch A vent valve 31 is provided between valve 22 and gas pressure accumulator 23.
Die beschriebene Vorrichtung wirkt in der Weise, daß zum Zweck des Absenkens des Hubtisches 10, den man sich als vorn in Pressung befindlichen (nicht gezeichneten) Muffenrohr belastet und von dem im System 27; 23; 26, 14, 11 b. herrschenden, konstanten Druck in Obenstellung gehalten. vorzustellen hat, über das Steuer-Einlaßventil 17 a bei geschlossenen Ablaß-Drosselventi118 a Druckluft in das System 17; 17 a, 15 .- 11 c gegeben wird: Während in der Heben-Seite 11 b, resultierend aus dem nachstehend noch zu beschreibenden Gewichtsausgleich mittels der Vorspannung im Gasdruckspeicher 23, z. B. 2 atü herrschen mögen, soll der Druck in der Senken-Seite 11 c 6 atü betragen. Unterstützt durch die Auflast wird- der Tisch durch :Drucklufteinleitung bei 17 a in das System 15, 11 c somit in die untere Endstellung gedrückt, Wobei das Volumen des Systems 11 b, 14, 26; 23, 27 sich verkleinert und der Druck entsprechend ansteigt, und zwar nach Maßgabe der zunehmenden Auflast durch Längerwerden des ausgepreßten Rohrstranges. Durch geeignete Blockiermittel z. B. magnetischer oder magnetomechanischer Art, die an sich bekannt sind, wird der Tisch in den Endlagen und eventuell Zwischenstellungen festgehalten.The device described works in such a way that for the purpose of lowering the lifting table 10, which is loaded as the front in compression (not shown) socket pipe and from which in the system 27; 23; 26, 14, 11 b. prevailing, constant pressure held in the up position. has to imagine, via the control inlet valve 17 a with the exhaust throttle valve closed a compressed air into the system 17; 17 a, 15 .- 11 c is given: While in the lifting side 11 b, resulting from the weight compensation to be described below by means of the bias in the gas pressure accumulator 23, z. B. 2 atü may prevail, the pressure in the sink side should be 11 c 6 atü. Supported by the load, the table is supported by: compressed air introduction at 17 a into the system 15, 11 c thus pressed into the lower end position, whereby the volume of the system 11 b, 14, 26; 23, 27 decreases in size and the pressure increases accordingly, in accordance with the increasing load caused by the length of the extruded pipe string. Suitable blocking agents, for. B. magnetic or magnetomechanical type, which are known per se, the table is held in the end positions and possibly intermediate positions.
Zum Heben des Hubtisches 10 wird das Ablaß-Drosselventil 18 a geöffnet und läßt, zweckmäßig unter entsprechender Drosselung zur Reglung der Geschwindigkeit des Hebens, den Druck aus dem System 11 c, 15, 18 ins Freie ab.To raise the lift table 10, the discharge throttle valve 18 a is opened and leaves, expediently with appropriate throttling to regulate the speed of lifting, the pressure from the system 11c, 15, 18 into the open.
Das Reduzierventil 25 dient dazu, im System 27; 23, 26, 14, 11 b einen konstanten Arbeitsdruck oder eine Vorspannung einzustellen; wobei diese Vorspannung so eingestellt wird; daß :die am Hubtisch 10 wirkende Aufwärtskraft dem Gewicht des unbelasteten Tisches, des Zylinders 11 und etwaiger darauf angebrachter Vorrichtungen das Gleichgewicht hält.The reducing valve 25 is used in the system 27; 23, 26, 14, 11b one to set a constant working pressure or a preload; with this bias so set; that: the upward force acting on the lifting table 10 is due to the weight the unloaded table, the cylinder 11 and any devices attached to it keeps the balance.
Es versteht sich, daß der Druck im Gasdruckspeicher 23 um so steiler ansteigen muß, als das ausge- . preßte Muffenrohr schwer ist. Dementsprechend wird um so mehr Verdrängeröl 27 a aus dem Behälter 28 in den Gasdruckspeicher 23 eingeführt, als ein schwerer Preßling hergestellt werden soll, so daß der Gegendruck der Aufwärtskraft stets gleich dem konstanten Gewicht des Tisches und des Führungsrohres und der zunehmenden Last des länger werdenden Preßlinges bleibt. A_ n Stelle von Verdrängeröl könnten auch andere bekannte, z. B. mechanische Verdrängermittel benutzt werden.It goes without saying that the pressure in the gas pressure accumulator 23 is all the steeper must increase than that. pressed socket pipe is heavy. Accordingly, will the more displacement oil 27 a introduced from the container 28 into the gas pressure accumulator 23, as a heavier compact is to be made so that the back pressure of the upward force always equal to the constant weight of the table and the guide tube and the increasing weight Burden of growing longer The pellet remains. A_ n place of displacement oil could also be other well-known, e.g. B. mechanical displacement means can be used.
Claims (7)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DER0036906 | 1964-01-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1584644B1 true DE1584644B1 (en) | 1970-01-22 |
Family
ID=7405043
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19641584644 Withdrawn DE1584644B1 (en) | 1964-01-02 | 1964-01-02 | Lifting table for a vertical extrusion press for the production of ceramic socket pipes |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE1584644B1 (en) |
FR (1) | FR1419361A (en) |
NL (1) | NL6415188A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB673357A (en) * | 1900-01-01 | |||
DE431740C (en) * | 1922-12-30 | 1926-07-16 | Joens Muehlow | Casting device for the production of tubular concrete objects, in particular hollow masts, using a core divided in the longitudinal direction |
DE1016177B (en) * | 1953-07-11 | 1957-09-19 | Boerge Flamand | Method and device for demolding of pipes cast in a standing position on a pipe support in a cavity between a mold shell and a mold core |
-
1964
- 1964-01-02 DE DE19641584644 patent/DE1584644B1/en not_active Withdrawn
- 1964-12-29 NL NL6415188A patent/NL6415188A/xx unknown
- 1964-12-31 FR FR573A patent/FR1419361A/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB673357A (en) * | 1900-01-01 | |||
DE431740C (en) * | 1922-12-30 | 1926-07-16 | Joens Muehlow | Casting device for the production of tubular concrete objects, in particular hollow masts, using a core divided in the longitudinal direction |
DE1016177B (en) * | 1953-07-11 | 1957-09-19 | Boerge Flamand | Method and device for demolding of pipes cast in a standing position on a pipe support in a cavity between a mold shell and a mold core |
Also Published As
Publication number | Publication date |
---|---|
FR1419361A (en) | 1965-11-26 |
NL6415188A (en) | 1965-07-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
E77 | Valid patent as to the heymanns-index 1977 | ||
EHJ | Ceased/non-payment of the annual fee |