DE3930388A1 - Moulding rubber undercut bellows shapes - by injection moulding preform without undercuts, placing this plus its core tool in final mould, extending core, inflating preform - Google Patents
Moulding rubber undercut bellows shapes - by injection moulding preform without undercuts, placing this plus its core tool in final mould, extending core, inflating preformInfo
- Publication number
- DE3930388A1 DE3930388A1 DE3930388A DE3930388A DE3930388A1 DE 3930388 A1 DE3930388 A1 DE 3930388A1 DE 3930388 A DE3930388 A DE 3930388A DE 3930388 A DE3930388 A DE 3930388A DE 3930388 A1 DE3930388 A1 DE 3930388A1
- Authority
- DE
- Germany
- Prior art keywords
- mandrel
- preform
- core
- placing
- plus
- 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.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
- B29C45/0055—Shaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/08—Biaxial stretching during blow-moulding
- B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D22/00—Producing hollow articles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J3/00—Diaphragms; Bellows; Bellows pistons
- F16J3/04—Bellows
- F16J3/041—Non-metallic bellows
- F16J3/043—Non-metallic bellows with particular means for limiting wear
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2009/00—Use of rubber derived from conjugated dienes, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/703—Bellows
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/84—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor
- F16D3/843—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers
- F16D3/845—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers allowing relative movement of joint parts due to the flexing of the cover
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Herstel lung von Hohlkörper-Formartikeln, insbesondere Falten balg-Manschetten, aus einem elastomeren Material, sowie auf einen Dorn zur Durchführung des Verfahrens.The invention relates to a method of manufacture development of hollow molded articles, in particular folds bellows cuffs, made of an elastomeric material, as well on a mandrel to carry out the process.
Hohlkörper-Formartikel, wie z.B. Faltenbalg-Manschetten aus Gummi, werden üblicherweise im Spritzgieß-Verfahren hergestellt, d.h. der Kautschuk wird in eine Form, in die ein entsprechender Dorn eingesetzt ist, eingespritzt und dort ausvulkanisiert. Nach der Vulkanisation wird der Formkörper dadurch entformt, daß er nach Öffnen der Form von dem Dorn heruntergezogen wird. Da aber eine Falten balg-Manschette aufeinanderfolgend Abschnitte abwechselnd kleineren und größeren Durchmessers aufweist, wird die Manschette beim Entformen sehr stark gedehnt, so daß da bei oftmals - insbesondere bei dünnen Materialstärken - ein Reißen des Formteils möglich ist.Hollow molded articles such as Bellows cuffs Made of rubber, are usually injection molded manufactured, i.e. the rubber is in a shape in which a corresponding mandrel is inserted, injected and vulcanized there. After vulcanization, the Molded body demolded in that after opening the mold is pulled down from the mandrel. But there is a fold bellows cuff alternating sections has smaller and larger diameter, the The cuff is very stretched during demolding, so that there with often - especially with thin material thicknesses - tearing of the molded part is possible.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Ver fahren anzugeben, mit dem derartige Hohlkörper-Formarti kel auf einfache Weise hergestellt werden können und bei dem insbesondere das Entformen ohne Kraftaufwendung be werkstelligt werden kann, so daß Schäden am fertigen Teil sicher vermieden werden.The invention is therefore based on the object, a Ver drive to indicate, with such hollow body form kel can be easily produced and at which in particular be demoulding without using force can be made so that damage to the finished part be safely avoided.
Zur Lösung dieser Aufgabe ist erfindungsgemäß vorgesehen, daß im Spritzgieß-Verfahren auf einem Dorn mit sich stu fenweise verringerndem Außendurchmesser ein Vorformling entsprechender Kontur hergestellt wird, daß der Vorform ling mit dem an den Durchmesserstufungen scheibenförmig geteilten Dorn in einer Heizform mit der endgültigen Außenkontur des Formartikels eingelegt, der Dorn in axia ler Richtung gestreckt und der Vorformling mittels über die Dornspalten zugeführter Druckluft aufgeblasen und an schließend ausvulkanisiert und entformt wird.To achieve this object, the invention provides that in the injection molding process on a mandrel with itself a preform appropriate contour is produced that the preform ling with the disc-shaped at the diameter gradations split mandrel in a heating mold with the final The outer contour of the molded article is inserted, the mandrel in axia stretched in the direction and the preform by means of the mandrel gaps inflated compressed air and on finally vulcanized and removed from the mold.
Das hierbei im Prinzip angewandte Spritzblas-Verfahren ist zwar zur Herstellung von Formkörpern aus thermopla stischem Material bekannt. Dieses Verfahren war aber nicht unmittelbar auf die Herstellung von Formartikeln aus elastomerem Material übertragbar, da wegen der unter schiedlichen Viskosität und der erforderlichen erheblich höheren Drücke beim Spritzgießen von elastomeren Materia lien eine Abdichtung der herkömmlichen Luftzuführungska näle für das anschließende Aufblasen nicht möglich ist. Erst die erfindungsgemäße Gestaltung eines radial unter teilten und damit streckbaren Dornes ermöglicht es, einen Vorformling auf einem vollständig geschlossenen Dorn her zustellen, über den dann durch die Spalten beim Recken die erforderliche Druckluft für das Aufblasen in die End form zugeführt werden kann.The injection blow molding process used here in principle is for the production of moldings from thermopla known material. However, this procedure was not directly on the manufacture of molded articles made of elastomeric material, because of the under different viscosity and the required considerably higher pressures when molding elastomeric materials lien a seal of the conventional Luftzuführungska channels for the subsequent inflation is not possible. Only the inventive design of a radial under shared and thus stretchable mandrel allows one Preform on a fully closed mandrel to deliver, then through the columns when stretching the compressed air required for inflation in the end form can be supplied.
Zweckmäßig und ausreichend ist es dabei, wenn eine Streckung des Dorns um etwa 1/10 mm je radialer Teilungs stufe erfolgt.It is useful and sufficient if one Extension of the mandrel by approximately 1/10 mm per radial division stage takes place.
Ferner sollten die radialen Durchmesseraufweitungen des Formartikels jeweils in Höhe der radialen Teilungsebenen des Dornes liegen.Furthermore, the radial diameter widening of the Molded article in each case at the level of the radial division levels of the thorn.
Bei einem Dorn zur Durchführung dieses Verfahrens ist er findungsgemäß vorgesehen, daß auf einer zentralen Achse mehrere scheibenförmige, in Achsrichtung jeweils abneh menden Außendurchmesser aufweisende Dornelemente ver schiebbar angeordnet sind, die parallel zur Achse eine alle Elemente durchsetzende Druckluft-Zuführungsbohrung aufweisen.He is with a mandrel to perform this procedure provided according to the invention that on a central axis several disc-shaped, each decreasing in the axial direction verend mandrel elements having outer diameter are slidably arranged parallel to the axis one compressed air supply hole penetrating all elements exhibit.
Besonders zweckmäßig ist es dabei, wenn die Achse mit dem Dornelement kleinsten Außendurchmessers starr verbunden ist und die Zuführungsbohrung allein die axial verschieb baren Dornelemente durchsetzt.It is particularly useful if the axis with the Mandrel element of the smallest outside diameter rigidly connected is and the feed hole alone the axially penetrated thorn elements.
Anhand einer schematischen Zeichnung sind Aufbau und Funktionsweise eines Ausführungsbeispiels nach der Erfin dung näher erläutert. Dabei zeigenBased on a schematic drawing are structure and Operation of an embodiment according to the Erfin explained in more detail. Show
Fig. 1 einen Längsschnitt durch einen Vorformling mit eingesetztem geschlossenem Dorn und Fig. 1 shows a longitudinal section through a preform with inserted closed mandrel and
Fig. 2 einen Längsschnitt durch den fertigen Formarti kel mit noch eingesetztem, entsprechend ge strecktem Dorn. Fig. 2 shows a longitudinal section through the finished Formarti angle with still inserted, correspondingly stretched mandrel.
Wie man zunächst deutlicher aus Fig. 2 ersieht, besteht der Dorn 1 beispielsweise aus 4 scheibenförmigen Dornele menten 2, 3, 4 und 5, die auf einer gemeinsamen Achse 6 geringfügig axial verschiebbar gehaltert sind.As can first be seen more clearly from Fig. 2, the mandrel 1 consists for example of 4 disc-shaped Dornele elements 2 , 3 , 4 and 5 , which are mounted on a common axis 6 slightly axially displaceable.
Nach Fig. 1 ist nunmehr der Dorn 1 in zusammengeschobenem Zustand als geschlossener Stufenzylinder in eine Spritz gießform 7 eingelegt. Nach Einspritzen eines elastomeren Materials, beispielsweise Kautschuk, in den vom Dorn 1 und der Form 7 begrenzten Hohlraum 8 wird dann ein Vor formling 10 der angegebenen Kontur erzeugt, der sich stu fenweise verengt und keine Hinterschneidungen aufweist. According to Fig. 1 the mandrel 1 in compressed state is now placed as a closed stage cylinder into an injection mold. 7 After injection of an elastomeric material, for example rubber, into the cavity 8 delimited by the mandrel 1 and the shape 7 , a preform 10 of the specified contour is then produced, which narrows in stages and has no undercuts.
Anschließend wird der Dorn 1 zusammen mit dem noch unvul kanisierten Vorformling 10 aus der Spritzgießform 7 ent nommen und in die ebenfalls nur schematisch angedeutete Vulkanisationsform 11 nach Fig. 2 eingesetzt. Der Formen hohlraum 12 dieser Vulkanisationsform 11 weist dabei die endgültige Außenkontur des herzustellenden Formartikels auf. Nach Einlegen des Dorns 1 mit dem Vorformling 10 wird der Dorn 1 geringfügig gestreckt, so daß sich zwi schen den scheibenförmigen Dornelementen 2, 3, 4 und 5 die radialen Spalten 13, 14 und 15 ergeben. Bei dem dar gestellten Ausführungsbeispiel ist die Achse 6 mit dem obersten Dornelement 5 starr verbunden, während die übri gen Dornelemente 4, 3 und 2 geringfügig verschiebbar auf der Achse 6 geführt sind.Then the mandrel 1 is removed from the injection mold 7 together with the still unvulcanized preform 10 and inserted into the vulcanization mold 11 according to FIG. 2, which is also only indicated schematically. The mold cavity 12 of this vulcanization mold 11 has the final outer contour of the molded article to be produced. After inserting the mandrel 1 with the preform 10 , the mandrel 1 is slightly stretched so that there are the radial gaps 13 , 14 and 15 between the disc-shaped mandrel elements 2 , 3 , 4 and 5 . In the illustrated embodiment, the axis 6 is rigidly connected to the top mandrel element 5 , while the rest of the mandrel elements 4 , 3 and 2 are guided slightly displaceably on the axis 6 .
Die einzelnen Dornelemente 2, 3 und 4 weisen ferner eine parallel zur Achse 6 verlaufende, gestrichelt eingezeich nete Bohrung 16 auf, die jeweils an den geöffneten Spal ten 13, 14 und 15 freiliegt. Diese Bohrung 16 ist so ge führt, daß sie in der oberen Stirnfläche des Dornele ments 4 seitlich neben dem anschließenden Dornelement 5, das einen kleineren Durchmeser aufweist, endet und kann im Dornelement 4 als seitlicher Einschnitt ausgebildet sein, während sie in den Elementen 2 und 3 als echte Boh rung verläuft. Über diese Bohrung 16 wird nunmehr Druck luft eingepreßt, die an den Spalten 13, 14 und 15 radial austritt und den Vorformling bis zum Ausfüllen der Kon tur 12 der Heizform 11 aufbläst. Damit ergibt sich dann die endgültige Form beispielsweise einer Faltenbalgman schette 20.The individual mandrel elements 2 , 3 and 4 also have a parallel to the axis 6 , dashed line bore 16 , each of which is exposed to the open gaps 13 , 14 and 15 . This bore 16 is so ge leads that it ends in the upper end face of the Dornele element 4 next to the adjacent mandrel element 5 , which has a smaller diameter, and can be formed in the mandrel element 4 as a lateral incision, while in the elements 2 and 3 runs as a real bore. Air is now pressed in via this bore 16 , which radially emerges at the columns 13 , 14 and 15 and inflates the preform until the cone 12 of the heating mold 11 is filled. This then results in the final shape, for example, of a bellows sleeve 20 .
Anschließend wird die so geformte Manschette 20 noch aus vulkanisiert und kann dann entformt werden. Dazu wird zu nächst der Dorn 1 glatt herausgezogen, was besonders ein fach und ohne Beschädigung der Manschette 20 erfolgen kann, da der Dorn 1 keine Hinterschneidungen aufweist, sondern entgegen der Auszugsrichtung stufenweise im Durchmesser abnimmt. Es ist aber auch ein Entfernen der Manschette 20 zusammen mit dem Dorn 1 und anschließendem Herausziehen des Dornes 1 möglich.The cuff 20 thus shaped is then vulcanized and can then be removed from the mold. For this purpose, the mandrel 1 is first pulled out smoothly, which can be done particularly easily and without damaging the sleeve 20 , since the mandrel 1 has no undercuts, but instead gradually decreases in diameter against the direction of extension. However, it is also possible removal of the sleeve 20 together with the mandrel 1 and subsequent extraction of the mandrel. 1
Mit dem beschriebenen Verfahren und der entsprechenden Gestaltung des Dorns ist es also möglich, auch Hohlkör per-Formartikel mit Hinterschneidungen aus Gummi mittels Spritzblasen herzustellen, ohne daß eine Beschädigung des Formartikels beim Entformen erfolgt.With the described method and the corresponding Design of the mandrel is therefore possible, also hollow body per-shaped article with undercuts made of rubber To produce injection bubbles without damaging the Molded article takes place during demolding.
Die beschriebene Gestaltung und radiale Unterteilung des Dornes sowie die Anordnung der Zuführungsbohrung für die Druckluft soll nur eine prinzipielle Möglichkeit angeben, die andere Gestaltungen, soweit sie von diesem Grundprin zip Gebrauch machen, nicht ausschließt.The described design and radial division of the Dornes and the arrangement of the feed hole for the Compressed air is only intended to indicate one basic possibility the other designs, insofar as they are based on this basic principle Use zip, not exclude.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3930388A DE3930388A1 (en) | 1989-09-12 | 1989-09-12 | Moulding rubber undercut bellows shapes - by injection moulding preform without undercuts, placing this plus its core tool in final mould, extending core, inflating preform |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3930388A DE3930388A1 (en) | 1989-09-12 | 1989-09-12 | Moulding rubber undercut bellows shapes - by injection moulding preform without undercuts, placing this plus its core tool in final mould, extending core, inflating preform |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3930388A1 true DE3930388A1 (en) | 1991-03-21 |
Family
ID=6389231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE3930388A Ceased DE3930388A1 (en) | 1989-09-12 | 1989-09-12 | Moulding rubber undercut bellows shapes - by injection moulding preform without undercuts, placing this plus its core tool in final mould, extending core, inflating preform |
Country Status (1)
Country | Link |
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DE (1) | DE3930388A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998038435A1 (en) * | 1997-02-27 | 1998-09-03 | Gkn Automotive Ag | Thermoplastic elastomer rolled bellows |
US5851476A (en) * | 1996-05-17 | 1998-12-22 | Miner Enterprises, Inc. | Method of manufacturing a bellowed seal |
EP1174239A1 (en) * | 2000-07-20 | 2002-01-23 | L'oreal | Method for producing a bellows |
FR2840967A1 (en) * | 2002-06-17 | 2003-12-19 | Gkn Glaenzer Spicer | Sealing bellows for transmission joint comprises bellows body having heel at each end giving sealed contact with shaft periphery or joint element fixed to shaft, each heel having support surface for fixing ring or collar |
DE10302883A1 (en) * | 2003-01-25 | 2004-08-05 | Contitech Luftfedersysteme Gmbh | Bellow vulcanization process for car air springs |
DE10302884A1 (en) * | 2003-01-25 | 2006-10-05 | Contitech Luftfedersysteme Gmbh | Curved tubular product, in particular a vehicle air spring, manufacture, involves pressure forming of tube with hot fluid against vulcanization tool wall |
WO2007085994A1 (en) * | 2006-01-27 | 2007-08-02 | Koninklijke Philips Electronics N.V. | A method of manufacturing a fluid damper, a fluid damper and an electronic device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2261174A1 (en) * | 1972-12-14 | 1974-06-27 | 4 P Verpackungen Gmbh | METHOD AND DEVICE FOR MANUFACTURING PRE-FORMS FROM THERMOPLASTICS |
DE3600444C2 (en) * | 1985-01-10 | 1988-03-03 | Toyoda Gosei Co., Ltd., Haruhi, Aichi, Jp |
-
1989
- 1989-09-12 DE DE3930388A patent/DE3930388A1/en not_active Ceased
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2261174A1 (en) * | 1972-12-14 | 1974-06-27 | 4 P Verpackungen Gmbh | METHOD AND DEVICE FOR MANUFACTURING PRE-FORMS FROM THERMOPLASTICS |
DE3600444C2 (en) * | 1985-01-10 | 1988-03-03 | Toyoda Gosei Co., Ltd., Haruhi, Aichi, Jp |
Non-Patent Citations (1)
Title |
---|
DE-Z: Kunststoffe, 1988, S. 705-709 * |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5851476A (en) * | 1996-05-17 | 1998-12-22 | Miner Enterprises, Inc. | Method of manufacturing a bellowed seal |
WO1998038435A1 (en) * | 1997-02-27 | 1998-09-03 | Gkn Automotive Ag | Thermoplastic elastomer rolled bellows |
EP1174239A1 (en) * | 2000-07-20 | 2002-01-23 | L'oreal | Method for producing a bellows |
FR2811932A1 (en) * | 2000-07-20 | 2002-01-25 | Oreal | METHOD FOR MANUFACTURING A BELLOWS |
US7025922B2 (en) | 2000-07-20 | 2006-04-11 | L'oreal | Method of manufacturing a bellows |
FR2840967A1 (en) * | 2002-06-17 | 2003-12-19 | Gkn Glaenzer Spicer | Sealing bellows for transmission joint comprises bellows body having heel at each end giving sealed contact with shaft periphery or joint element fixed to shaft, each heel having support surface for fixing ring or collar |
DE10302883A1 (en) * | 2003-01-25 | 2004-08-05 | Contitech Luftfedersysteme Gmbh | Bellow vulcanization process for car air springs |
DE10302884A1 (en) * | 2003-01-25 | 2006-10-05 | Contitech Luftfedersysteme Gmbh | Curved tubular product, in particular a vehicle air spring, manufacture, involves pressure forming of tube with hot fluid against vulcanization tool wall |
DE10302883B4 (en) * | 2003-01-25 | 2021-06-24 | Contitech Luftfedersysteme Gmbh | Vulcanization process and vulcanization device with bellows for car air springs |
WO2007085994A1 (en) * | 2006-01-27 | 2007-08-02 | Koninklijke Philips Electronics N.V. | A method of manufacturing a fluid damper, a fluid damper and an electronic device |
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OP8 | Request for examination as to paragraph 44 patent law | ||
8127 | New person/name/address of the applicant |
Owner name: METZELER GIMETALL AG, 8000 MUENCHEN, DE |
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8131 | Rejection |