EP0243763B1 - Vertically adjustable elastomeric pot-bearing - Google Patents
Vertically adjustable elastomeric pot-bearing Download PDFInfo
- Publication number
- EP0243763B1 EP0243763B1 EP87105352A EP87105352A EP0243763B1 EP 0243763 B1 EP0243763 B1 EP 0243763B1 EP 87105352 A EP87105352 A EP 87105352A EP 87105352 A EP87105352 A EP 87105352A EP 0243763 B1 EP0243763 B1 EP 0243763B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- elastomeric
- pot
- strips
- fact
- bearing
- 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.)
- Expired - Lifetime
Links
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 239000011324 bead Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 229920001195 polyisoprene Polymers 0.000 claims 1
- 229920001971 elastomer Polymers 0.000 abstract description 26
- 239000000806 elastomer Substances 0.000 abstract description 21
- 238000007789 sealing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000008407 joint function Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/04—Bearings; Hinges
- E01D19/048—Bearings being adjustable once installed; Bearings used in incremental launching
Definitions
- the invention relates to a height-adjustable rubber pot bearing with an elastomer plate for transferring and lifting or lowering heavy loads, especially in bridge construction, in which a locally displacing the amount of pressure fluid from the elastomer can be pressed in between the bottom of the pot and the elastomer plate.
- Rubber cup bearings of this type are known, for example from "Bautechnik” 7/1984, page 227, Figure 13.
- the task now is to seal the peripheral edge region of the elastomer plate against the inner wall of the bearing cup in order to press out the pressed-in parts To prevent hydraulic fluid.
- the stated object is achieved in that the elastomer plate has a narrow slot at a short distance from the inner wall of the pot and parallel to it, which is open at the bottom and is up to 3/4 of its deep, and in the slot a circular-cylindrical insert is used, which consists of two strips leaving a small space between each other and parallel and integrally connected at their upper edges, which are angled at their lower edges at right angles to edge strips pointing in opposite directions and parallel to the bottom of the pot.
- This configuration creates an annular cavity open at the bottom and enclosed by the two strips, in which the pressure fluid supplied from below can enter and the insert can spread apart. This increases the pressure of the sealing lips on the inner wall of the pot and improves the sealing effect.
- the two strips can be provided with beads running perpendicular to the angled edge strips, whereby these beads can be directed inwards from both sides of the strips and touch one another, or they can also be directed outwards from the space between the strips .
- these beads can be such that they only extend to a certain distance from the interconnected upper edges of the two strips, so that an upper edge area remains free of beads, thereby reducing the rigidity of the upper edge area and this part can perform a joint function to spread the two strips.
- This hinge function is further improved if the part connecting the two strips at their upper edges has a tubular, circular cross section.
- the design can also be such that the part connecting the two strips at their upper edges has a tubular, rectangular cross section.
- the insert can either consist of sheet steel or of a plastic. It can furthermore be advantageous if the angled lower edge strips running at right angles to the strips have incisions at regular intervals. By means of these incisions it is avoided that when the originally flat insert is deformed into a circular cylindrical structure, upsetting or excessive expansion stresses occur. It can furthermore be expedient if the peripheral surface of the elastomer plate is designed before it is pressed into the pot in such a way that it tapers upwards like a cone.
- the circular-cylindrical insert can consist of a plurality of separate individual sections, wherein the individual sections furthermore have a plug-like extension on one side and can be used to overlap astride one another.
- the insert inserted from the individual sections can slightly change its circumferential length or its diameter when the elastomer plate is pressed into the bearing pot.
- the circular-cylindrical insert consists of a polygonal line in straight individual elements, the individual elements being slightly bent in the region of the expansion around the vertical axis in the case of small diameters of the elastomer plate.
- the elastomer plate is denoted by 1, the pot side wall by 2 and the pot bottom by 3.
- the bearing cap 4 is placed on the elastomer plate 1. 5 with the lid edge seal is referred to, which is inserted into the elastomer plate 1.
- the pressure fluid is injected so that it covers the space between the lower surface of the Elastomeric plate 1 and the surface (8) of the pot bottom 3 fulfilled, which results in the space 7.
- the pressure fluid also penetrates into the cavities 22 of the insert from below and tries to spread them apart, so that the pressure of the sealing lip against the inner wall 10 of the pot side wall 2 is increased.
- the open cavities 22 of the insert can be seen from FIG.
- Fig. 3 of the insert shows that the beads 26 only make up about 2/3 to 3/4 of the total height of the insert, so that a strip 27 remains free of beads.
- the inwardly directed beads 26 touch one another without being connected to one another.
- the upper, free of beads area 27 practically represents a hinge, so that the sides acting as expansion legs parts of the material strips can spread apart.
- this joint function is further improved in that this upper region is designed to be annular.
- the cavities 22 between the beads 26, which are filled by the pressure means can spread apart under the effect of the pressing pressure of the pressure fluid supplied.
- the angled lower edge strips can be provided with the slots 28 in order to avoid compression and expansion stresses when the originally flat insert is formed into the circular cylindrical shape.
- FIG. 8 Another advantageous embodiment of the elastomer plate 1 is shown in FIG. 8. Due to the conical tapering outer surface of the elastomer plate before it is pressed into the pot, the contact pressure of the sealing lip can be increased.
- FIG. 8a shows the elastomer plate 1 before being inserted into the bearing pot, of which the inner wall 10 of the pot is indicated by dash-dotted lines.
- the insert E (see FIG. 1) consisting of strips 21 is inserted, through which the gap is kept open in a radial width, which is designated by 12.
- the bottom of the pot is indicated by dash-dotted lines at 8.
- the edge strips 25 rest on the pot bottom 8 and on the underside 8 of the elastomer plate 1.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Combined Devices Of Dampers And Springs (AREA)
- Bridges Or Land Bridges (AREA)
- Springs (AREA)
- Support Of The Bearing (AREA)
- Cultivation Receptacles Or Flower-Pots, Or Pots For Seedlings (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein höhenverstellbares Gummitopflager mit einer Elastomere-Platte zum Übertragen und Anheben bzw. Absenken schwerer Lasten, insbesondere im Brückenbau, bei dem von außen zwischen Topfboden und Elastomere-Platte eine das Elastomere örtlich verdrängende Druckflüssigkeitsmenge einpreßbar ist.The invention relates to a height-adjustable rubber pot bearing with an elastomer plate for transferring and lifting or lowering heavy loads, especially in bridge construction, in which a locally displacing the amount of pressure fluid from the elastomer can be pressed in between the bottom of the pot and the elastomer plate.
Gummitopflager dieser Bauart sind bekannt, beispielsweise aus "Bautechnik" 7/1984, Seite 227, Bild 13. Bei einem Lager dieser Art besteht nun die Aufgabe, den umlaufenden Randbereich der Elastomere-Platte gegenüber der Innenwandung des Lagertopfes abzudichten, um ein Herausdrücken der eingepreßten Druckflüssigkeit zu verhindern. Ausgehend von dem bekannten Gummitopflager wird die angegebene Aufgabe dadurch gelöst, daß die Elastomere-Platte einen in geringem Abstand von der Topfinnenwand und parallel zu dieser umlaufenden, schmalen, unten offenen, bis zu 3/4 ihrer Dicke tiefen Schlitz aufweist und daß in den Schlitz eine kreiszylinderförmige Einlage eingesetzt wird, die aus zwei einen geringen Zwischenraum zwischen sich freilassenden zueinander parallelen und an ihren Oberkanten miteinander einstückig verbundenen Streifen besteht, welche an ihren unteren Kanten rechtwinklig zu in entgegengesetzte Richtungen weisenden, parallel zum Topfboden verlaufenden Randstreifen abgewinkelt sind.Rubber cup bearings of this type are known, for example from "Bautechnik" 7/1984, page 227, Figure 13. In a bearing of this type, the task now is to seal the peripheral edge region of the elastomer plate against the inner wall of the bearing cup in order to press out the pressed-in parts To prevent hydraulic fluid. Starting from the well-known rubber pot bearing, the stated object is achieved in that the elastomer plate has a narrow slot at a short distance from the inner wall of the pot and parallel to it, which is open at the bottom and is up to 3/4 of its deep, and in the slot a circular-cylindrical insert is used, which consists of two strips leaving a small space between each other and parallel and integrally connected at their upper edges, which are angled at their lower edges at right angles to edge strips pointing in opposite directions and parallel to the bottom of the pot.
Durch diese Ausbildungsweise wird ein nach unten offener, von den beiden Streifen umschlossener ringförmiger Hohlraum geschaffen, in welchem die von unten zugeführte Druckflüssigkeit eintreten und die Einlage auseinanderspreizen kann. Dadurch wird der Andruck der Dichtlippen an der Innenwandung des Topfes verstärkt und die Dichtwirkung verbessert.This configuration creates an annular cavity open at the bottom and enclosed by the two strips, in which the pressure fluid supplied from below can enter and the insert can spread apart. This increases the pressure of the sealing lips on the inner wall of the pot and improves the sealing effect.
Nach einer besonderen Ausgestaltung können die beiden Streifen mit senkrecht zu den abgewinkelten Randstreifen verlaufenden Sicken versehen sein, wobei diese Sicken von beiden Seiten der Streifen nach innen gerichtet und sich gegenseitig berühren können oder aber sie können auch von dem Zwischenraum zwischen den Streifen nach außen gerichtet sein.According to a special embodiment, the two strips can be provided with beads running perpendicular to the angled edge strips, whereby these beads can be directed inwards from both sides of the strips and touch one another, or they can also be directed outwards from the space between the strips .
Die weitere Ausbildung dieser Sicken kann so getroffen sein, daß sie nur bis zu einem gewissen Abstand von den miteinander verbundenen Oberkanten der beiden Streifen reichen, so daß ein oberer Randbereich eben frei von Sicken bleibt, wodurch die Steifigkeit des oberen Randbereiches vermindert wird und dieser Teil eine Gelenkfunktion zum Ausspreizen der beiden Streifen ausüben kann. Diese Gelenkfunktion wird dadurch noch verbessert, wenn der die beiden Streifen an ihren Oberkanten verbindende Teil einen rohrartigen, kreisförmigen Querschnitt aufweist. In Abwandlung hiervon kann die Ausbildung auch so getroffen sein, daß der die beiden Streifen an ihren Oberkanten verbindende Teil einen rohrartigen, rechteckigen Querschnitt aufweist.The further formation of these beads can be such that they only extend to a certain distance from the interconnected upper edges of the two strips, so that an upper edge area remains free of beads, thereby reducing the rigidity of the upper edge area and this part can perform a joint function to spread the two strips. This hinge function is further improved if the part connecting the two strips at their upper edges has a tubular, circular cross section. In a modification of this, the design can also be such that the part connecting the two strips at their upper edges has a tubular, rectangular cross section.
Erfindungsgemäß kann die Einlage entweder aus Stahlblech oder aber aus einem Kunststoff bestehen. Vorteilhaft kann es weiterhin sein, wenn die rechtwinklig zu den Streifen verlaufenden abgewinkelten unteren Randstreifen in regelmäßigen Abständen Einschnitte aufweisen. Durch diese Einschnitte wird vermieden, daß es beim Verformen der ursprünglich ebenen Einlage zu einem kreiszylindrischen Gebilde zu Stauchungen oder übermäßigen Dehnspannungen kommt. Es kann ferner zweckmäßig sein, wenn die Umfangsfläche der Elastomere-Platte vor dem Einpressen in den Topf so gestaltet wird, daß sie sich nach oben kegelartig verjüngt. In einer weiter abgewandelten Ausbildungsweise kann die kreiszylindrische Einlage aus einer Mehrzahl von getrennten Einzelabschnitten bestehen, wobei ferner die Einzelabschnitte einseitig eine steckhülsenartige Erweiterung aufweisen und sich überlappend rittlings übereinandergreifend eingesetzt sein können.According to the invention, the insert can either consist of sheet steel or of a plastic. It can furthermore be advantageous if the angled lower edge strips running at right angles to the strips have incisions at regular intervals. By means of these incisions it is avoided that when the originally flat insert is deformed into a circular cylindrical structure, upsetting or excessive expansion stresses occur. It can furthermore be expedient if the peripheral surface of the elastomer plate is designed before it is pressed into the pot in such a way that it tapers upwards like a cone. In a further modified embodiment, the circular-cylindrical insert can consist of a plurality of separate individual sections, wherein the individual sections furthermore have a plug-like extension on one side and can be used to overlap astride one another.
Dabei ist vorgesehen, daß die aus den Einzelabschnitten zusammengesteckte Einlage beim Einpressen der Elastomere-Platte in den Lagertopf geringfügig ihre Umfangslänge bzw. ihren Durchmesser ändern kann.It is provided that the insert inserted from the individual sections can slightly change its circumferential length or its diameter when the elastomer plate is pressed into the bearing pot.
Es ergibt sich daraus, daß die kreiszylinderförmige Einlage aus einem Polygonzug in sich gerader Einzelelemente besteht, wobei die Einzelelemente bei kleinen Durchmessern der Elastomere-Platte im Bereich der Erweiterung um die Vertikalachse geringfügig abgeknickt sind.It follows from this that the circular-cylindrical insert consists of a polygonal line in straight individual elements, the individual elements being slightly bent in the region of the expansion around the vertical axis in the case of small diameters of the elastomer plate.
Weitere Einzelheiten der Erfindung sind anhand der in der Zeichnung dargestellten und im folgenden beschriebenen Ausführungsbeispiele erläutert. Es zeigt
- Fig. 1 einen senkrechten Querschnitt durch ein Gummitopflager mit einer Elastomere-Platte nach der Erfindung,
- Fig. 2 einen waagerechten Schnitt A-A nach Fig. 1,
- Fig. 2a einen waagerechten Schnitt A-A nach Fig. 1 in einer anderen Ausführung,
- Fig. 3 eine Seitenansicht eines Abschnittes der Einlage,
- Fig. 4 einen Querschnitt C-C nach Fig. 3,
- Fig. 5 einen waagerechten Schnitt B-B nach Fig. 3,
- Fig. 6 die Darstellung nach Fig. 5 in gedehntem Zustand der Einlage,
- Fig. 7 einen Querschnitt C-C nach Fig. 3 in einer anderen Ausführung,
- Fig. 8 die Elastomere-Platte vor dem Einpressen im Querschnitt,
- Fig. 8a die Elastomere-Platte vor dem Einpressen mit eingesetzter Einlage im Querschnitt.
- 1 is a vertical cross section through a rubber cup bearing with an elastomer plate according to the invention,
- 2 shows a horizontal section AA according to FIG. 1,
- 2a shows a horizontal section AA according to FIG. 1 in another embodiment,
- 3 is a side view of a portion of the insert,
- 4 shows a cross section CC according to FIG. 3,
- 5 shows a horizontal section BB according to FIG. 3,
- 6 shows the representation according to FIG. 5 in the stretched state of the insert,
- 7 shows a cross section CC according to FIG. 3 in another embodiment,
- 8 the cross section of the elastomer plate before pressing in,
- Fig. 8a, the elastomer plate before pressing in with inserted insert in cross section.
In Fig. 1 ist die Elastomere-Platte mit 1, die Topf-Seitenwand mit 2 und der Topfboden mit 3 bezeichnet. Auf der Elastomere-Platte 1 ist der Lagerdeckel 4 aufgesetzt. Mit 5 ist die Deckelranddichtung bezeichnet, welche in die Elastomere-Platte 1 eingesetzt ist.In Fig. 1, the elastomer plate is denoted by 1, the pot side wall by 2 and the pot bottom by 3. The
Durch die Zuführungsleitung 6 wird die Druckflüssigkeit eingepreßt, so daß sie den Zwischenraum zwischen der unteren Fläche der Elastomere-Platte 1 und der Oberfläche (8) des Topfbodens 3 erfüllt wodurch sich der Zwischenraum 7 ergibt. Die Druckflüssigkeit dringt auch in die Hohlräume 22 der Einlage von unten her ein und versucht diese auseinanderzuspreizen, so daß der Andruck der Dichtlippe an die Innenwandung 10 der Topf-Seitenwand 2 verstärkt wird.Through the supply line 6, the pressure fluid is injected so that it covers the space between the lower surface of the Elastomeric plate 1 and the surface (8) of the pot bottom 3 fulfilled, which results in the space 7. The pressure fluid also penetrates into the
Aus Fig. 2 sind die offenen Hohlräume 22 der Einlage ersichtlich.The
Die Seitenansicht nach Fig. 3 der Einlage läßt erkennen, daß die Sicken 26 nur etwa 2/3 bis 3/4 der Gesamthöhe der Einlage ausmachen, so daß ein Streifen 27 frei von Sicken bleibt. Wie aus Fig. 4 hervorgeht, berühren sich die nach innen gerichteten Sicken 26 gegenseitig, ohne miteinander verbunden zu sein. Der obere, von Sicken freie Bereich 27 stellt praktisch ein Gelenk dar, so daß sich die als Spreizschenkel wirkenden Seiten teile der Werkstoffstreifen auseinanderspreizen können. In der Ausbildung nach Fig. 7 ist diese Gelenkfunktion noch dadurch verbessert, daß dieser obere Bereich kreisringförmit ausgebildet ist.The side view of Fig. 3 of the insert shows that the
Aus dem waagerechten Schnitt B-B nach den Fig. 5 und 6 ist erkennbar, daß die von den Druckmitteln erfüllten Hohlräume 22 zwischen den Sicken 26 sich unter der Wirkung des Preßdruckes der zugeführten Druckflüssigkeit auseinanderspreizen können. Wie ferner aus den Fig. 5 und 6 ersichtlich ist, können die abgewinkelten randunteren Randstreifen mit den Schlitzen 28 versehen sein, um Stauch- und Dehnspannungen beim Umformen der ursprünglich ebenen Einlage in die kreiszylindrische Form zu vermeiden.It can be seen from the horizontal section B-B according to FIGS. 5 and 6 that the
Eine weitere vorteilhafte Ausbildungsweise der Elastomere-Platte 1 ist in Fig. 8 dargestellt. Durch die sich nach oben kegelartig verjüngende Außenfläche der Elastomere-Platte vor dem Einpreßen in den Topf kann die Anpreßkraft der Dichtlippe noch verstärkt werden.Another advantageous embodiment of the elastomer plate 1 is shown in FIG. 8. Due to the conical tapering outer surface of the elastomer plate before it is pressed into the pot, the contact pressure of the sealing lip can be increased.
Dieser Vorgang ist weiter verdeutlicht in Fig. 8a, welche die Elastomere-Platte 1 vor dem Einsetzen in den Lagertopf zeigt, von dem die Topfinnenwand 10 strichpunktiert angedeutet ist. In den Schlitz 13 ist die Einlage E (s. Fig. 1) bestehend aus Streifen 21 eingesetzt, durch den der Spalt in einer radialen Breite offengehalten wird, die mit 12 bezeichnet ist. Der Topfboden ist strichpunktiert mit 8 angedeutet. Die Randstreifen 25 liegen am Topfboden 8 und an der Unterseite 8 der Elastomere-Platte 1 an.This process is further illustrated in FIG. 8a, which shows the elastomer plate 1 before being inserted into the bearing pot, of which the
Claims (11)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87105352T ATE57213T1 (en) | 1986-04-22 | 1987-04-10 | HEIGHT ADJUSTABLE RUBBER BEARING WITH AN ELASTOMERIC PLATE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3613545 | 1986-04-22 | ||
DE3613545 | 1986-04-22 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0243763A2 EP0243763A2 (en) | 1987-11-04 |
EP0243763A3 EP0243763A3 (en) | 1988-11-17 |
EP0243763B1 true EP0243763B1 (en) | 1990-10-03 |
Family
ID=6299236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87105352A Expired - Lifetime EP0243763B1 (en) | 1986-04-22 | 1987-04-10 | Vertically adjustable elastomeric pot-bearing |
Country Status (5)
Country | Link |
---|---|
US (1) | US4779842A (en) |
EP (1) | EP0243763B1 (en) |
AT (1) | ATE57213T1 (en) |
CS (1) | CS270223B2 (en) |
DE (1) | DE3765296D1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19719987A1 (en) * | 1997-05-13 | 1998-06-04 | Zueblin Ag | Method of coupling rigid railtrack on reinforced concrete sleepers to bridge crossing |
CN106192736A (en) * | 2016-07-18 | 2016-12-07 | 深圳市市政设计研究院有限公司 | High-damping rubber shock isolating pedestal, intelligence bearing and bearing monitoring system |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1157640B (en) * | 1960-12-17 | 1963-11-21 | Esslingen Maschf | Tilting bearings, especially for bridges or the like. Structures |
DE1179477B (en) * | 1962-08-30 | 1964-10-08 | Schoen & Cie G M B H | Machine for splitting, sharpening and roughening soles for footwear with a stamping device |
DE2063746A1 (en) * | 1970-12-24 | 1972-07-13 | Kober Ag, Glarus (Schweiz) | Tilting bearings for bridges or similar structures |
DE2461325B1 (en) * | 1974-12-24 | 1976-04-01 | Kober Ag | Plain bearings for bridges or similar structures |
US4046354A (en) * | 1975-08-26 | 1977-09-06 | Stith Jr Morris Randall | Apparatus for positioning and supporting a machine |
US4173329A (en) * | 1976-09-22 | 1979-11-06 | Stith Morris R Jr | Jack for positioning and supporting a machine |
US4484512A (en) * | 1981-09-10 | 1984-11-27 | Jacques Dechavanne | Seal, scraper, and guide for double-acting piston |
DE3209120C1 (en) * | 1982-03-12 | 1987-10-01 | Boris Dr-Ing Topaloff | Reinforced elastomer bearing for supporting heavy components, especially on bridges |
EP0122474A3 (en) * | 1983-04-13 | 1986-02-05 | Schwäbische Hüttenwerke Gesellschaft mit beschränkter Haftung | Vertically adjustable bearing for the transfer and raising or lowering of heavy loads |
US4592532A (en) * | 1983-11-14 | 1986-06-03 | Stith Jr M Randall | Expansible support and method of use |
DE3443120C2 (en) * | 1984-11-27 | 1987-01-08 | SHW Schwäbische Hüttenwerke GmbH, 7080 Aalen | Height-adjustable rubber cup bearing for transferring and lifting or lowering heavy loads, especially in bridge construction |
-
1987
- 1987-04-10 EP EP87105352A patent/EP0243763B1/en not_active Expired - Lifetime
- 1987-04-10 DE DE8787105352T patent/DE3765296D1/en not_active Expired - Lifetime
- 1987-04-10 AT AT87105352T patent/ATE57213T1/en not_active IP Right Cessation
- 1987-04-22 CS CS872854A patent/CS270223B2/en not_active IP Right Cessation
- 1987-04-22 US US07/041,193 patent/US4779842A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US4779842A (en) | 1988-10-25 |
EP0243763A3 (en) | 1988-11-17 |
EP0243763A2 (en) | 1987-11-04 |
CS270223B2 (en) | 1990-06-13 |
ATE57213T1 (en) | 1990-10-15 |
CS285487A2 (en) | 1989-10-13 |
DE3765296D1 (en) | 1990-11-08 |
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