EP0237756B1 - Low pressure lifting bag having an airtight chamber with a valve - Google Patents

Low pressure lifting bag having an airtight chamber with a valve Download PDF

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Publication number
EP0237756B1
EP0237756B1 EP87101624A EP87101624A EP0237756B1 EP 0237756 B1 EP0237756 B1 EP 0237756B1 EP 87101624 A EP87101624 A EP 87101624A EP 87101624 A EP87101624 A EP 87101624A EP 0237756 B1 EP0237756 B1 EP 0237756B1
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EP
European Patent Office
Prior art keywords
ring
wall
compensation
fastener
pressure 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.)
Expired
Application number
EP87101624A
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German (de)
French (fr)
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EP0237756A1 (en
Inventor
Manfred Vetter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manfred Vetter & Comp GmbH
Manfred Vetter Verwaltungsgesellschaft Mit Beschra
Vetter GmbH
Original Assignee
Vepro GmbH
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Publication date
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Publication of EP0237756A1 publication Critical patent/EP0237756A1/en
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Publication of EP0237756B1 publication Critical patent/EP0237756B1/en
Expired legal-status Critical Current

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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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/10—Characterised by the construction of the motor unit the motor being of diaphragm type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • B66F3/25—Constructional features
    • B66F3/35—Inflatable flexible elements, e.g. bellows

Definitions

  • the invention relates to a low-pressure lifting bag with an airtight chamber, the wall of which consists of a rubber or plastic-coated fabric and with a valve arranged in this wall, which has a spout, which consists of a valve stub and a through a hole in the wall there is a fastening ring connected to this and the inside of the wall.
  • Low-pressure lifting bags of the type mentioned at the outset differ from high-pressure lifting bags in that the fabric material of their wall is stretchable.
  • a cord or a similar, tear-resistant material in particular a steel cord or a plastic cord, is embedded in the then much thicker walls, which reinforces the walls of the pillow so that stretching in the direction of the reinforcement practically no longer occurs.
  • Low-pressure lifting bags are manufactured, for example, in a pressure range up to five bar, high-pressure lifting bags are available for much higher pressures.
  • Low-pressure lifting bags of the type mentioned are known for example from the English patents 1 355 315 and 1 405 888, both prior publications show cylindrical lifting bags with an ordered valve in the cylinder jacket. This consists of a grommet which is passed through a hole in the cylinder jacket and lies flat against the inner wall with its fastening ring.
  • the grommet is made of rubber, its tubular valve stub goes in one piece into the mounting ring.
  • the fastening ring in particular has a significantly greater wall thickness than the wall into which the spout is glued.
  • the fabric material of the wall in the area of the fastening ring is significantly stiffened by the latter, so that the extensibility of the material is greatly reduced. If one goes outwards from this area thickened by the fastening ring, the ductility of the wall material at the outer edge of the fastening ring jumps abruptly to a much lower value, namely the value of the normal, unreinforced fabric material.
  • the fastening area between the spout and the wall is the hole location of the known low-pressure lifting bags.
  • the bursting pressure of the known pillows is determined practically exclusively by the quality of this connection area.
  • the long-term behavior of the known pillows is essentially influenced by this connection area, since they also form microfolds with every normal filling process, which takes place at pressures far below the burst pressure, and these increase in the long run and form leaks.
  • the object of the invention is to avoid the disadvantages of the known low-pressure lifting bags of the type mentioned at the outset and to further develop the bags in such a way that, despite the use of stretchable fabric material for the wall between the spout and the surrounding wall area, there are no discontinuities, microfolds or the like when inflating occur and the weakening of the uniform course of the wall in the region of the hole does not lead to a mechanical weakening of the entire cushion.
  • a compensation ring is arranged between the fastening ring and the wall, which has a larger diameter than the fastening ring, preferably made of a material with a higher extensibility than the fastening ring and the fabric material the wall is made and is connected on one side to the fastening ring and on the other side via an annular connecting surface to the wall so that an annular compensation zone remains free between the inner edge of this annular connecting surface and the outer edge of the fastening ring, on which the compensation ring neither is still connected to the spout with the man part.
  • this low-pressure lifting bag The key feature of this low-pressure lifting bag is that the grommet's fastening ring is no longer connected directly to the wall, but to the wall with the compensation ring interposed.
  • the compensation ring is connected on both sides, on the one hand with the fastening ring of the grommet and on the other hand with the fabric material of the wall in such a way that an annular compensation zone remains between the two fastening areas, on which the compensation ring is free on both sides is not connected to another part.
  • This construction means that the spout can be moved back and forth a little in relation to the wall. With the previously known low-pressure lifting bag, such a separate movement of the spout was not possible because this was directly connected to the fabric material of the wall.
  • the relative mobility of the spout with respect to the wall does not have a negative effect, since the fastening ring is pressed against the inside of the wall by the internal pressure.
  • the spout is pressed too much into the interior, as a result of which the annular connecting surface between the compensation ring and the wall would be heavily loaded, a further development proposes that the spout outside the hole be so to reinforce that it can only be pushed slightly into the interior of the pillow.
  • the compensation ring Due to the compensation ring, a gradual, carefully graded transition to the hole in the wall and the surrounding wall area on the one hand and the wall and the wall and the spout on the other hand is created. Since the hole with its inner edges is no longer directly connected to the nozzle, but can be moved relative to it, the weakening of the continuous course of the wall surface caused by the hole and the connection between the outer surface and the nozzle can take place separately and can be optimized separately. In a further development of the invention, the area around the hole can be reinforced by at least one reinforcing ring, so that cracks on the edge of the hole are prevented.
  • the relatively stiff material of the spout which is usually made of several millimeters thick rubber, is no longer connected to the fabric material of the wall itself, but a compensation is created via the compensation ring. Since the material of the compensation ring has a higher extensibility than the material of the wall, the relatively stiff spout only has an insignificant influence on the expansion process of the wall when inflated. With regard to the spout, the continuous, uniform course of the wall is only impaired by the fact that the wall is thickened in the area of the annular connecting surface by the additional material of the compensation ring.
  • this thickening protects the inside hole and can be coordinated with the reinforcement rings mentioned so that optimal conditions occur when inflating, in other words, the fact that a hole must necessarily be provided in the wall, the mechanical expansion ratios when inflating the pillow does not more noticeably bothers.
  • the advantage of the compensation ring according to the invention is that the manufacture of the low-pressure lifting bag remains simple and the connection area of the spout to the wall is only insignificantly thicker, it remains practically as flat as in the known low-pressure lifting bag.
  • the compensation ring is a simple ring disk that is glued or preferably vulcanized onto the fastening ring of the spout.
  • the compensation zone is located concentrically outside of the connection area described, the annular connection surface in turn outside the compensation zone.
  • the compensation ring can also be constructed in the manner of a bellows. In the simplest version, it is constructed from two ring disks similar to the ring disk just mentioned. One (lower) ring washer is connected to the fastening ring of the grommet as described above, in particular by vulcanization, it is free in the subsequent ring area located further out and is connected at its outer edge to the second (upper) ring washer. This in turn is connected at its inner ring area to the wall material surrounding the hole.
  • the latter solution is more complex and not as inexpensive as the solution with only one washer as a compensation ring, but it has the advantage that the overall diameter can be smaller and the connection is made directly in the area of the hole in the wall.
  • FIG. 1 shows a partial area of a wall 20 of a low-pressure lifting bag, this partial area forms, together with the other areas, an airtight chamber of, for example, cylindrical or cubic shape.
  • the wall 20 is cut from a rubber or plastic-coated fabric, it has a thickness in the range of millimeters, for example 0.8 mm.
  • the area around a hole 22 of the wall 20 is shown for the passage of a spout 24 of a valve arranged in the wall 20, not otherwise shown in detail.
  • the grommet consists of a tubular valve stub 26 which is guided through the hole 22 and a fastening ring 28 connected to the latter and to the inside of the wall 20.
  • the spout 24 is made in one piece from rubber, the pipe socket 26 has a wall thickness of approximately 4 mm and a total length of approximately 5 cm, the fastening ring 28 typically has a diameter of approximately 11 cm, its material thickness decreases from the transition area to the pipe socket 26 towards the outside as can be seen in particular from FIGS. 2 and 3. It also has 30 projections into the interior of the cushion, for example blocks 32, which prevent the inside end of the pipe socket 26 from being closed by another partial area of the wall 20 in the folded state.
  • the coated fabric material of the wall 20 is stretchable, the extent of the stretch is determined almost exclusively by the fabric used.
  • a compensation ring 34 is connected to the spout 24, preferably by vulcanization, but possibly also by gluing.
  • it is designed as a simple disk which has an outer diameter which is approximately twice the outer diameter of the fastening ring 28. Its inner hole has a clear diameter that is slightly larger than the outer diameter of the pipe socket 26.
  • the compensation ring 34 is made of a preferably rubber-coated fabric that has a higher elasticity than the material used for the wall 20. Rubber-coated material is preferably used in order to be able to connect the compensation ring 34 by vulcanization to the fastening ring 28 and the transition to the pipe socket 26.
  • the part composed of spout 24 and compensation ring 34 is prefabricated and assembled with the other parts to be described.
  • the compensation ring 34 consists, for example, of a single-layer nylon fabric.
  • the compensation ring 34 is connected to the spout 24 in an annular and flat manner on its underside.
  • the compensation ring 34 remains unconnected on both sides on the corresponding area of its upper side and an adjoining annular compensation zone.
  • it is glued to the wall 20 on its upper side in an annular connecting surface 38 located outside the compensation zone 36; the corresponding adhesive surface 40 on the inside of the wall 20 is shown in broken lines in FIG. 1.
  • the adhesive surface 40 inevitably runs concentrically to the hole 22; at the same time, it advantageously stiffens the region around the hole 22, which means an interruption of the continuum.
  • two reinforcement rings 42, 44 are also provided in the exemplary embodiment shown, which are also designed as disks, but have different, namely stepped outer diameters, in comparison to the compensation ring 34.
  • the outer diameters are chosen so that the wall 20 is gradually reinforced starting from the annular adhesive surface 40 to the hole 22.
  • the outer reinforcing ring 42 has an outer diameter which is slightly larger than the diameter of the outer edge of the compensation zone 36, thereby preventing an unreinforced area of wall material from being left free between the adhesive surface 40 and the reinforcing ring 42.
  • the reinforcement ring 44 arranged on the inside has an outer diameter which is somewhat larger than the outer diameter of the fastening ring 28. The reinforcement described reinforces the area around the hole 22 in such a way that the formation of cracks at the edge of the hole 22 is reliably avoided even with burst pressure becomes.
  • the reinforcement rings 42, 44 are adhesively bonded to the wall 20.
  • the exemplary embodiment according to FIG. 2 which is also shown in the assembled state, differs from the exemplary embodiment according to FIG. 1 essentially only in that only one reinforcing ring 42 is used.
  • the part composed of grommet 24 and compensation ring 34 which in turn has the shape of a simple perforated disc, is shown as a part which has already been connected, in this case connected by vulcanization, the wall 20 is placed on this part in the direction of the arrows and in the region of the connecting surface 38 annularly connected to the outer edge region of the compensation ring 34.
  • the reinforcement ring 42 as is also true for the two reinforcement rings 42, 44 according to FIG. 1, is glued over the entire surface to the wall 20 centrally to the hole 22.
  • a type of bellows is used as the compensation ring 34, which is composed of two perforated disks 46, 48.
  • the lower perforated disk 46 is, as has been explained for the entire compensation ring 34 according to the previous examples, connected flatly to the fastening ring 28 and the adjacent spout 24.
  • the lower perforated disc remains free on both sides around this vulcanization area. At its outer edge area, it is connected to the upper perforated disk 48 via an annular connecting surface 50 and preferably by vulcanization.
  • the upper perforated disk also remains free on both sides of an annular area within this connecting area 50; it is connected at its upper inner edge area along the annular connecting surface 38 to the inside of the wall 20.
  • the geometry is, but is not necessary, such that the connecting surface 38 extends to the edge of the hole 22 and the inner hole of the perforated disk 48 has the same diameter as the hole 22.
  • no reinforcement rings 42, 44 are shown.
  • Such rings both on the inside and on the outside of the wall 20 can, however, be provided.
  • 3 has the advantage that when reinforcing rings 42, 44 are used, the connecting surface 38 lies inside the reinforced area and not, as in the case of the exemplary embodiments according to FIGS. 1 and 2, on the outer edge of the reinforced area.
  • a reinforcement ring can also be placed between the tub manure 20 and the upper perforated disc 48 are arranged, it either protrudes into the connecting surface 38 or is located outside of this.
  • a metal nipple is inserted into the spout 24, which is fastened by means of a commercially available pipe clamp. Furthermore, an outer nozzle grips over the valve. These parts are not shown, they are known.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Check Valves (AREA)
  • Diaphragms And Bellows (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)

Abstract

1. A low-pressure lifting bag having an airtight chamber the wall (20) of which consists of a fabric covered with rubber or plastic and a valve fitted in this wall (20) having a nozzle (24) which comprises a pipe socket (26) inserted through a hole 22 in the wall (20) and a ring-fastener (28) attached to this pipe socket (26) and linked with the inner side of the wall (20), characterized in that between the ring-fastener (28) and the wall (20) there is arranged a compensation-ring (34) which is of greater external diameter than the ring-fastener (28) and which on the one side is so arranged with the ring-fastener (28) and on the other via a ring-shaped joining-surface (38) is so attached to the wall (20) that between this joining-surface (38) and the outside edge of the ring-fastener (28) there remains a ring-shaped compensation area (36) on which the compensation-ring (34) is linked neither with the wall (20) nor with the nozzle (24).

Description

Die Erfindung bezieht sich auf ein Niederdruck-Hebekissen mit einer luftdichten Kammer, deren Wandung aus einem gummi- oder kuststoffbeschichteten Gewebe besteht und mit einem in dieser Wandung angeordneten Ventil, das eine Tülle aufweist, die aus einem durch ein Loch in der Wandung hindurchgeführten Ventilstutzen und einem mit diesem und der Innenseite der Wandung verbunden Befestigungsring besteht.The invention relates to a low-pressure lifting bag with an airtight chamber, the wall of which consists of a rubber or plastic-coated fabric and with a valve arranged in this wall, which has a spout, which consists of a valve stub and a through a hole in the wall there is a fastening ring connected to this and the inside of the wall.

Niederdruck-Hebekissen der eingangsgenannten Art unterscheiden sich dadurch von Hochdruck-Hebekissen, daß das Gewebematerial ihrer Wandung dehnbar ist. Bei Hochdruck-Kissen ist in die dann wesentlich dickeren Wandungen ein Cord oder ein ähnliches, reißfestes Material, insbesondere ein Stahlcord oder ein Kunststoffcord, eingebettet, der die Wandungen des Kissens so verstärkt, daß eine Dehnung in Richtung der Armierung praktisch nicht mehr auftritt. Niederdruck-Hebekissen werden beispielsweise in einem Druckbereich bis fünf bar gefertigt, Hochdruck-Hebekissen gibt es für weitaus höhere Drücke.Low-pressure lifting bags of the type mentioned at the outset differ from high-pressure lifting bags in that the fabric material of their wall is stretchable. In the case of high-pressure pillows, a cord or a similar, tear-resistant material, in particular a steel cord or a plastic cord, is embedded in the then much thicker walls, which reinforces the walls of the pillow so that stretching in the direction of the reinforcement practically no longer occurs. Low-pressure lifting bags are manufactured, for example, in a pressure range up to five bar, high-pressure lifting bags are available for much higher pressures.

Niederdruck-Hebekissen der eingangsgenannten Art sind beispielsweise aus den englischen Patentschriften 1 355 315 und 1 405 888 bekannt, beide Vorveröffentlichungen zeigen zylinderförmige Hebekissen mit einem im Zylindermantel an geordneten Ventil. Dieses besteht aus einer Tülle, die durch ein Loch im Zylindermantel hindurchgeführt ist und mit ihrem Befestigungsring flächig an der Innenwand anliegt.Low-pressure lifting bags of the type mentioned are known for example from the English patents 1 355 315 and 1 405 888, both prior publications show cylindrical lifting bags with an ordered valve in the cylinder jacket. This consists of a grommet which is passed through a hole in the cylinder jacket and lies flat against the inner wall with its fastening ring.

Die Tülle ist aus Gummi gefertigt, ihr rohrförmiger Ventilstutzen geht einstückig in den Befestigungsring über. Insbesondere der Befestigungsring hat eine deutlich grössere Wandstärke als die Wandung, in die die Tülle eingeklebt ist. Dadurch wird das Gewebematerial der Wandung im Bereich des Befestigungsringes durch diesen deutlich ausgesteift, so daß die Dehnbarkeit des Materials stark verringert wird. Geht man von diesem, durch den Befestigungsring verdickten Bereich nach außen, so springt die Dehnbarkeit des Wandungsmaterials am Außenrand des Befestigungsringes abrupt auf einen wesentlich niedrigeren Wert, nämlich den Wert des normalen, unverstärkten Gewebematerials. In diesem Bereich und etwas außerhalb treten beim Aufblasen des Hebekissens kleine Falten auf, die sich sternförmig nach außen erstrecken und im wesentlichen vom Mittelpunkt des Loches in der Wandung ausgehen. Beim Aufblasen dehnt sich zwangsläufig das Wandungsmaterial aus, da aber die Dehnbarkeit außerhalb des versteifenden Befestigungsrings größer ist als im Bereich des Befestigungsrings, treten zwangsläufig Unregelmäßigkeiten an der beschriebenen Übergangsstelle auf, die sich in den erwähnten, kleinen Falten, im folgenden Mikrofalten genannt, auswirken. Diese führen zu einer starken Belastung der Verklebung zwischen Befestigungsring und Gewebematerial der Wandung, es kommt zu lokalen Schwächungen dieser Verbindung, zu Lockerungen und einem lokalen Ablösen. Dadurch entstehen Leckstellen zwischen der Tülle und dem das Loch in der Wandung umgebenden, beschichteten Gewebe. Das Hebekissen wird unbrauchbar und muß, falls dies möglich ist, repariert werden.The grommet is made of rubber, its tubular valve stub goes in one piece into the mounting ring. The fastening ring in particular has a significantly greater wall thickness than the wall into which the spout is glued. As a result, the fabric material of the wall in the area of the fastening ring is significantly stiffened by the latter, so that the extensibility of the material is greatly reduced. If one goes outwards from this area thickened by the fastening ring, the ductility of the wall material at the outer edge of the fastening ring jumps abruptly to a much lower value, namely the value of the normal, unreinforced fabric material. In this area and somewhat outside, small creases appear when the lifting bag is inflated, which extend in a star shape and extend essentially from the center of the hole in the wall. When inflated, the wall material inevitably expands, but since the extensibility outside the stiffening fastening ring is greater than in the region of the fastening ring, irregularities inevitably occur at the transition point described, which have an effect in the small folds mentioned, hereinafter referred to as microfolds. These lead to a strong load on the bond between the fastening ring and the fabric material of the wall, this connection is weakened locally, loosened and loosened locally. This creates leaks between the grommet and the coated fabric surrounding the hole in the wall. The lifting bag becomes unusable and, if possible, must be repaired.

Der Befestigungsbereich zwischen Tülle und Wandung, genauer gesagt zwischen dem Befestigungsring der Tülle und dem die Schwachstelle umgebenden Bereich des beschichteten Gewebes, ist die Lochstelle der bekannten Niederdruck-Hebekissen. Demzufolge ist auch der Berstdruck der vorbekannten Kissen praktisch ausschließlich durch die Qualität dieses Verbindungsbereiches bestimmt. Aber auch das Langzeitverhalten der vorbekannten Kissen wird im wesentlichen durch diesen Verbindungsbereich beeinflußt, da sie auch bei jedem normalen Füllvorgang, der bei Drucken weit unterhalb des Berstdruckes erfolgt, Mikrofalten ausbilden und diese sich auf die Dauer vergrößern und Leckstellen bilden.The fastening area between the spout and the wall, more precisely between the fastening ring of the spout and the area of the coated fabric surrounding the weak point, is the hole location of the known low-pressure lifting bags. As a result, the bursting pressure of the known pillows is determined practically exclusively by the quality of this connection area. But also the long-term behavior of the known pillows is essentially influenced by this connection area, since they also form microfolds with every normal filling process, which takes place at pressures far below the burst pressure, and these increase in the long run and form leaks.

Hiervon ausgehend hat sich die Erfindung die Aufgabe gestellt, die Nachteile der bekannten Niederdruck-Hebekissen der eingangsgenannten Art zu vermeiden und die Kissen dahingehend weiterzuentwickeln, daß trotz Verwendung von dehnbarem Gewebematerial für die Wandung zwischen Tülle und umgebenden Wandungsbereich keine Unstetigkeiten, Mikrofalten oder dergleich beim Aufblasen auftreten und die Schwächung des gleichmäßigen Verlaufs der Wandung im Bereich des Lochs nicht zu einer mechanischen Schwächung des Gesamtkissens führt.Proceeding from this, the object of the invention is to avoid the disadvantages of the known low-pressure lifting bags of the type mentioned at the outset and to further develop the bags in such a way that, despite the use of stretchable fabric material for the wall between the spout and the surrounding wall area, there are no discontinuities, microfolds or the like when inflating occur and the weakening of the uniform course of the wall in the region of the hole does not lead to a mechanical weakening of the entire cushion.

Diese Aufgabe wird ausgehend von dem Niederdruck-Hebekissen der eingangsgenannten Art dadurch gelöst, daß zwischen dem Befestigungsring und der Wandung ein Kompensationsring angeordnet ist, der einen größeren Durchmesser als der Befestigungsring aufweist, vorzugsweise aus einem Material mit einer höheren Dehnbarkeit als der Befestigungsring und das Gewebematerial der Wandung gefertigt ist und an seiner einen Seite mit dem Befestigungsring und an seiner anderen Seite über eine ringförmige Verbindungsfläche mit der Wandung so verbunden ist, daß zwischen dem Innenrand dieser ringförmigen Verbindungsfläche und dem Außenrand des Befestigungsrings eine ringförmige Ausgleichszone freibleibt, auf der der Kompensationsring weder mit dem Manteil noch mit der Tülle verbunden ist.This object is achieved on the basis of the low-pressure lifting bag of the type mentioned in that a compensation ring is arranged between the fastening ring and the wall, which has a larger diameter than the fastening ring, preferably made of a material with a higher extensibility than the fastening ring and the fabric material the wall is made and is connected on one side to the fastening ring and on the other side via an annular connecting surface to the wall so that an annular compensation zone remains free between the inner edge of this annular connecting surface and the outer edge of the fastening ring, on which the compensation ring neither is still connected to the spout with the man part.

Das entscheidende Merkmal dieses Niederdruck-Hebekissens liegt darin, daß der Befestigungsring der Tülle nicht mehr unmittelbar mit der Wandung, sondern unter Zwischenschaltung des Kompensationsrings mit der Wandung verbunden ist. Dabei erfolgt die beidseitige Verbindung des Kompensationsringes, und zwar auf der einen Seite mit dem Befestigungsring der Tülle und auf der anderen Seite mit mit dem Gewebematerial der Wandung dergestalt, daß eine ringförmige Ausgleichszone zwischen beiden Befestigungsbereichen verbleibt, auf der der Kompensationsring an seinen beiden Seiten frei ist, also nicht mit einem anderen Teil verbunden ist. Diese Konstruktion bringt es mit sich, daß die Tülle etwas gegenüber der Wandung hin- und herbewegt werden kann. Bei dem vorbekannten Niederdruck-Hebekissen war eine derartige separate Bewegung der Tülle nicht möglich, da diese direkt mit dem Gewebematerial der Wandung verbunden wurde. Beim praktischen Betrieb wirkt sich die relative Bewegbarkeit der Tülle gegenüber der Wandung nicht negativ aus, da durch den Innendruck der Befestigungsring gegen die Innenseite der Wandung gepreßt wird. Um zu vermeiden, daß bei aufgeblasenem Kissen durch eine Ungeschicklichkeit oder durch Unwissenheit die Tülle zu stark in den Innenraum gedrückt wird, wodurch die ringförmige Verbindungsfläche zwischen dem Kompensationsring und der Wandung stark belastet würde, wird in einer Weiterentwicklung vorgeschlagen, die Tülle außerhalb des Lochs so zu verstärken, daß sie nur geringfügig in den Innenraum des Kissens gedrückt werden kann.The key feature of this low-pressure lifting bag is that the grommet's fastening ring is no longer connected directly to the wall, but to the wall with the compensation ring interposed. The compensation ring is connected on both sides, on the one hand with the fastening ring of the grommet and on the other hand with the fabric material of the wall in such a way that an annular compensation zone remains between the two fastening areas, on which the compensation ring is free on both sides is not connected to another part. This construction means that the spout can be moved back and forth a little in relation to the wall. With the previously known low-pressure lifting bag, such a separate movement of the spout was not possible because this was directly connected to the fabric material of the wall. In practical operation, the relative mobility of the spout with respect to the wall does not have a negative effect, since the fastening ring is pressed against the inside of the wall by the internal pressure. In order to avoid that, when the cushion is inflated, due to ineptness or ignorance, the spout is pressed too much into the interior, as a result of which the annular connecting surface between the compensation ring and the wall would be heavily loaded, a further development proposes that the spout outside the hole be so to reinforce that it can only be pushed slightly into the interior of the pillow.

Aufgrund des Kompensationsringes wird ein allmählicher, sorgfältig abstufbarer Übergang zu dem Loch der Wandung und dem umgebenden Wandungsbereich einerseits und der Wandung und der Wandung und der Tülle andererseits geschaffen. Da das Loch mit seinen Innenrändern nicht mehr mit der Tülle direkt verbunden ist, sondern gegenüber dieser bewegt werden kann, können die durch das Loch hervorgerufenen Schwächungen des kontinuierlichen Verlaufs der Wandungsfläche und die Verbindung zwischen Mantelfläche und Tülle separat voneinander erfolgen und separat voneinander optimiert werden. So kann in einer Weiterbildung der Erfindung der Bereich um das Loch herum durch mindestens einen Verstärkungsring verstärkt werden, so daß eine Entstehung von Rissen am Lochrand verhindert wird. Hinsichtlich der Tülle ist nicht mehr das relativ steife Material der Tülle, die zumeist aus mehrere Millimeter starkem Gummi gefertigt ist, mit dem Gewebematerial der Wandung selbst verbunden, sondern über den Kompensationsring wird ein Ausgleich geschaffen. Da das Material des Kompensationsringes eine höhere Dehnbarkeit hat als das Material der Wandung, beeinflußt die relativ steife Tülle beim Aufblasen nur noch unwesentlich den Ausdehnungsvorgang der Wandung. Hinsichtlich der Tülle wird der kontinuierliche, gleichmäßige Verlauf der Wandung nur dadurch beeinträchtigt, daß die Wandung im Bereich der ringförmigen Verbindungsfläche durch das zusätzliche Material des Kompensationsringes verdickt ist. Diese Verdickung schützt aber andererseits das innseitige Loch und kann mit den erwähnten Verstärkungsringen so abgestimmt werden, daß optimale Verhältnisse beim Aufblasen auftreten, anders ausgedrückt, die Tatsache, daß zwangsläufig ein Loch in der Wandung vorgesehen werden muß, die mechanischen Ausdehnungsverhältnisse beim Aufblasen des Kissens nicht mehr merklich stört.Due to the compensation ring, a gradual, carefully graded transition to the hole in the wall and the surrounding wall area on the one hand and the wall and the wall and the spout on the other hand is created. Since the hole with its inner edges is no longer directly connected to the nozzle, but can be moved relative to it, the weakening of the continuous course of the wall surface caused by the hole and the connection between the outer surface and the nozzle can take place separately and can be optimized separately. In a further development of the invention, the area around the hole can be reinforced by at least one reinforcing ring, so that cracks on the edge of the hole are prevented. With regard to the spout, the relatively stiff material of the spout, which is usually made of several millimeters thick rubber, is no longer connected to the fabric material of the wall itself, but a compensation is created via the compensation ring. Since the material of the compensation ring has a higher extensibility than the material of the wall, the relatively stiff spout only has an insignificant influence on the expansion process of the wall when inflated. With regard to the spout, the continuous, uniform course of the wall is only impaired by the fact that the wall is thickened in the area of the annular connecting surface by the additional material of the compensation ring. On the other hand, this thickening protects the inside hole and can be coordinated with the reinforcement rings mentioned so that optimal conditions occur when inflating, in other words, the fact that a hole must necessarily be provided in the wall, the mechanical expansion ratios when inflating the pillow does not more noticeably bothers.

Der Vorteil des erfindungsgemäßen Kompensationsringes liegt darin , daß die Herstellung des Niederdruck-Hebekissens nach wie vor einfach bleibt und der Verbindungsbereich der Tülle mit der Wandung nur unwesentlich dicker wird, er bleibt praktisch so flach wie beim vorkannten Niederdruck-Hebekissen.The advantage of the compensation ring according to the invention is that the manufacture of the low-pressure lifting bag remains simple and the connection area of the spout to the wall is only insignificantly thicker, it remains practically as flat as in the known low-pressure lifting bag.

In der einfachsten Ausbildung ist der Kompensationsring eine einfache Ringscheibe, die auf den Befestigungsring der Tülle aufgeklebt oder vorzugsweise aufvulkanisiert ist. Die Ausgleichszone befindet sich konzentrisch außerhalb dieses beschriebenen Verbindungsbereichs, die ringförmige Verbindungsfläche wiederum außerhalb der Ausgleichszone.In the simplest form, the compensation ring is a simple ring disk that is glued or preferably vulcanized onto the fastening ring of the spout. The compensation zone is located concentrically outside of the connection area described, the annular connection surface in turn outside the compensation zone.

Der Kompensationsring kann aber auch in Art eines Faltenbalges aufgebaut sein. In der einfachsten Ausführung ist er aus zwei Ringscheiben ähnlich der soeben erwähnten Ringscheibe aufgebaut. Die eine (untere) Ringscheibe ist wie oben beschrieben mit dem Befestigungsring der Tülle verbunden, insbesondere durch Vulkanisation, sie ist im anschließenden, weiter außen befindlichen Ringbereich frei und an ihrem Außenrand mit der zweiten (oberen) Ringscheibe verbunden. Diese wiederum ist an ihrem Innenringbereich mit dem das Loch umgebenden Material der Wandung verbunden.The compensation ring can also be constructed in the manner of a bellows. In the simplest version, it is constructed from two ring disks similar to the ring disk just mentioned. One (lower) ring washer is connected to the fastening ring of the grommet as described above, in particular by vulcanization, it is free in the subsequent ring area located further out and is connected at its outer edge to the second (upper) ring washer. This in turn is connected at its inner ring area to the wall material surrounding the hole.

Die letztere Lösung ist aufwendiger und nicht so kostengünstig wie die Lösung mit lediglich einer Ringscheibe als Kompensationsring, sie hat aber den Vorteil, daß der Gesamtdurchmesser kleiner sein kann und die Verbindung unmittelbar im Bereich des Loches der Wandung erfolgt.The latter solution is more complex and not as inexpensive as the solution with only one washer as a compensation ring, but it has the advantage that the overall diameter can be smaller and the connection is made directly in the area of the hole in the wall.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus den übrigen Ansprüchen sowie der nun folgenden Beschreibung von drei nicht einschränkend zu verstehenden Ausführungsbeispielen der Erfindung, die unter Bezugnahme auf die Zeichnung im folgenden näher erläutert werden. In dieser zeigen:

  • Fig. 1 ein Montagebild des Ventilbereichs eines Niederdruck-Hebekissens mit einem Kompensationsring in Form einer Ringscheibe und zwei Verstärkungsringen,
  • Fig. 2 ein Axialschnitt durch ein Montagebild ähnlich Figur 1, jedoch mit nur einem Verstärkungsring und
  • Fig. 3 ein Schnittbild ähnlich Figur 2, jedoch mit einem Kompensationsring, der aus zwei Ringscheiben aufgebaut ist.
Further advantages and features of the invention emerge from the remaining claims and the following description of three non-restrictive exemplary embodiments of the invention, which are explained in more detail below with reference to the drawing. In this show:
  • 1 is an assembly picture of the valve area of a low pressure lifting bag with a compensation ring in the form of an annular disc and two reinforcing rings,
  • Fig. 2 is an axial section through an assembly picture similar to Figure 1, but with only one reinforcing ring and
  • Fig. 3 is a sectional view similar to Figure 2, but with a compensation ring, which is made up of two washers.

In Fig. 1 ist ein Teilbereich einer Wandung 20 eines Niederdruck-Hebekissens gezeigt, dieser Teilbereich bildet zusammen mit den übrigen Bereichen eine luftdichte Kammer von beispielsweise zylindrischer oder kubischer Form. Die Wandung 20 ist aus einem gummi- oder kunststoffbeschichteten Gewebe zugeschnitten, sie hat eine im Bereich Millimeter liegende Dicke, beispielsweise 0,8 mm. Gezeigt ist der Bereich um ein Loch 22 der Wandung 20 für den Durchlaß einer Tülle 24 eines in der Wandung 20 angeordneten, sonst nicht näher dargestellten Ventils. Die Tülle besteht aus einem rohrförmigen, durch das Loch 22 hindurchgeführten Ventilstutzen 26 und einem mit diesem und der Innenseite der Wandung 20 verbundenen Befestigungsring 28.1 shows a partial area of a wall 20 of a low-pressure lifting bag, this partial area forms, together with the other areas, an airtight chamber of, for example, cylindrical or cubic shape. The wall 20 is cut from a rubber or plastic-coated fabric, it has a thickness in the range of millimeters, for example 0.8 mm. The area around a hole 22 of the wall 20 is shown for the passage of a spout 24 of a valve arranged in the wall 20, not otherwise shown in detail. The grommet consists of a tubular valve stub 26 which is guided through the hole 22 and a fastening ring 28 connected to the latter and to the inside of the wall 20.

Die Tülle 24 ist einstückig aus Gummi gefertigt, der Rohrstutzen 26 hat eine Wandstärke von etwa 4 mm und eine Gesamtlänge von etwa 5 cm, der Befestigungsring 28 hat typischerweise einen Durchmesser von etwa 11 cm, seine Materialstärke nimmt vom Übergangsbereich zum Rohrstutzen 26 nach außen hin ab, wie insbesondere aus den Figuren 2 und 3 zu ersehen ist. Er hat zudem ins Kisseninnere 30 weisende Vorsprünge, beispielsweise Klötze 32, die verhindern, daß im zusammengefalteten Zustand das innenseitige Ende des Rohrstutzens 26 durch einen anderen Teilbereich der Wandung 20 verschlossen werden kann.The spout 24 is made in one piece from rubber, the pipe socket 26 has a wall thickness of approximately 4 mm and a total length of approximately 5 cm, the fastening ring 28 typically has a diameter of approximately 11 cm, its material thickness decreases from the transition area to the pipe socket 26 towards the outside as can be seen in particular from FIGS. 2 and 3. It also has 30 projections into the interior of the cushion, for example blocks 32, which prevent the inside end of the pipe socket 26 from being closed by another partial area of the wall 20 in the folded state.

Das beschichtete Gewebematerial der Wandung 20 ist dehnbar, das Maß der Dehnung wird dabei praktisch ausschließlich durch das verwendete Gewebe bestimmt. Eine sehr geringe Reißdehnung von etwa vier Prozent zeigt beispielsweise ein Keflargewebe, Nylongewebe haben in zweilagiger Ausführung beispielsweise Reißdehnungen von etwa zwanzig Prozent, bei einlagigen Geweben liegt die Reißdehnung noch höher.The coated fabric material of the wall 20 is stretchable, the extent of the stretch is determined almost exclusively by the fabric used. A very low elongation at break of about four percent, for example, shows a Keflar fabric, nylon fabrics in two-layer design, for example, have an elongation at break of about 20 percent, with single-layer fabrics the elongation at break is even higher.

Mit der Tülle 24 ist ein Kompensationsring 34 vorzugsweise durch Vulkanisation, gegebenenfalls aber auch durch Kleben verbunden. Er ist im Ausführungsbeispiel nach Figur 1 als einfache Scheibe ausgebildet, die einen Außendurchmesser hat, der etwa das doppelte des Außendurchmessers des Befestigungsringes 28 ist. Sein Innenloch hat einen lichten Durchmesser, der etwas größer ist als der Außendurchmesser des Rohrstutzens 26. Der Kompensationsring 34 wird aus einem vorzugsweise gummibeschichteten Gewebe gefertigt, daß eine höhere Dehnbarkeit hat als das für die Wandung 20 verwendete Material. Vorzugsweise wird gummibeschichtetes Material verwendet, um den Kompensationsring 34 durch Vulkanisieren mit dem Befestigungsring 28 und dem Übergang zum Rohrstutzen 26 verbinden zu können. Bei der Herstellung eines Hebekissens wird das aus Tülle 24 und Kompensationsring 34 zusammengesetzte Teil vorgefertigt und mit den noch zu beschreibenden, weiteren Teilen zusammengesetzt.A compensation ring 34 is connected to the spout 24, preferably by vulcanization, but possibly also by gluing. In the exemplary embodiment according to FIG. 1, it is designed as a simple disk which has an outer diameter which is approximately twice the outer diameter of the fastening ring 28. Its inner hole has a clear diameter that is slightly larger than the outer diameter of the pipe socket 26. The compensation ring 34 is made of a preferably rubber-coated fabric that has a higher elasticity than the material used for the wall 20. Rubber-coated material is preferably used in order to be able to connect the compensation ring 34 by vulcanization to the fastening ring 28 and the transition to the pipe socket 26. In the manufacture of a lifting bag, the part composed of spout 24 and compensation ring 34 is prefabricated and assembled with the other parts to be described.

Falls als Material der Wandung 20 ein Keflar-Gewebe benutzt wird, wird beispielsweise zweilagiges Nylongewebe für den Kompensationsring 34 eingesetzt. Ist die Wandung 20 aus zweilagigem Nylongewebe zugeschnitten, besteht der Kompensationsring 34 beispielsweise aus einlagigem Nylongewebe.If a Keflar fabric is used as the material of the wall 20, for example, two-layer nylon fabric is used for the compensation ring 34. If the wall 20 is cut from a two-layer nylon fabric, the compensation ring 34 consists, for example, of a single-layer nylon fabric.

In der Darstellung nach Figur 1 ist der Kompensationsring 34 auf seiner Unterseite ringförmig und flächig mit der Tülle 24 verbunden. Auf dem entsprechenden Bereich seiner Oberseite und einer sich daran anschliessenden, ringförmigen Ausgleichszone bleibt der Kompensationsring 34 an beiden Seiten unverbunden. In der Darstellung gemäß Figur 1 ist er auf seiner Oberseite in einer außerhalb der Ausgleichszone 36 befindlichen, ringförmigen Verbindungsfläche 38 mit der Wandung 20 verklebt, die entsprechende Klebfläche 40 an der Innenseite der Wandung 20 ist in Figur 1 gestrichelt eingezeichnet. Die Klebfläche 40 verläuft zwangsläufig konzentrisch zum Loch 22, sie steift zugleich den Bereich um das Loch 22, der eine Unterbrechung des Kontinuums bedeutet, vorteilhaft aus.In the illustration according to FIG. 1, the compensation ring 34 is connected to the spout 24 in an annular and flat manner on its underside. The compensation ring 34 remains unconnected on both sides on the corresponding area of its upper side and an adjoining annular compensation zone. In the illustration according to FIG. 1, it is glued to the wall 20 on its upper side in an annular connecting surface 38 located outside the compensation zone 36; the corresponding adhesive surface 40 on the inside of the wall 20 is shown in broken lines in FIG. 1. The adhesive surface 40 inevitably runs concentrically to the hole 22; at the same time, it advantageously stiffens the region around the hole 22, which means an interruption of the continuum.

Zur weiteren Verstärkung des Randes des Loches 22 sind im gezeigten Ausführungsbeispiel noch zwei Verstärkungsringe 42, 44 vorgesehen, die ebenfalls als Scheiben ausgebildet sind, aber im Vergleich zum Kompensationsring 34 andere, nämlich abgestufte Außendurchmesser, haben. Die Außendurchmesser sind so gewählt, daß die Wandung 20 ausgehend von der ringförmigen Klebefläche 40 zum Loch 22 hin schrittweise verstärkt wird. So hat der äußere Verstärkungsring 42 einen Außendurchmesser, der etwas größer ist als der Durchmesser des Außenrandes der Ausgleichszone 36, wodurch verhindert wird, daß zwischen Klebfläche 40 und Verstärkungsring 42 ein unverstärkter Bereich an Wandungsmaterial frei bleibt. Der auf der Innenseite angeordnete Verstärkungsring 44 hat einen Außendurchmesser, der etwas größer ist als der Außendurchmesser des Befestigungsringes 28. Durch die beschriebene Verstärkung wird der Bereich um das Loch 22 so ausgesteift das die Entstehung von Rissen am Rand des Loches 22 auch bei Berstdrucken sicher vermieden wird. Die Verstärkungsringe 42, 44 werden mit der Wandung 20 klebverbunden.To further reinforce the edge of the hole 22, two reinforcement rings 42, 44 are also provided in the exemplary embodiment shown, which are also designed as disks, but have different, namely stepped outer diameters, in comparison to the compensation ring 34. The outer diameters are chosen so that the wall 20 is gradually reinforced starting from the annular adhesive surface 40 to the hole 22. Thus, the outer reinforcing ring 42 has an outer diameter which is slightly larger than the diameter of the outer edge of the compensation zone 36, thereby preventing an unreinforced area of wall material from being left free between the adhesive surface 40 and the reinforcing ring 42. The reinforcement ring 44 arranged on the inside has an outer diameter which is somewhat larger than the outer diameter of the fastening ring 28. The reinforcement described reinforces the area around the hole 22 in such a way that the formation of cracks at the edge of the hole 22 is reliably avoided even with burst pressure becomes. The reinforcement rings 42, 44 are adhesively bonded to the wall 20.

Das Ausführungsbeispiel gemäß Figur 2, das ebenfalls im Montagezustand gezeigt ist, unterscheidet sich vom Ausführungsbeispiel nach Figur 1 im wesentlichen nur dadurch, daß lediglich ein Verstärkungsring 42 eingesetzt ist. Das aus Tülle 24 und Kompensationsring 34, der wiederum die Form einer einfachen Lochscheibe hat, zusammengesetzte Teil ist als bereits verbundenes, in diesem Fall durch Vulkanisation verbundenes Teil gezeigt, die Wandung 20 wird im Sinne der Pfeile auf dieses Teil gelegt und im Bereich der Verbindungsfläche 38 ringförmig mit dem Außenrandbereich des Kompensationsringes 34 verbunden. Der Verstärkungsring 42 wird, wie dies auch für die beiden Verstärkungsringe 42, 44 gemäß Figur 1 gilt, vollflächig mit der Wandung 20 zentrisch zum Loch 22 verklebt.The exemplary embodiment according to FIG. 2, which is also shown in the assembled state, differs from the exemplary embodiment according to FIG. 1 essentially only in that only one reinforcing ring 42 is used. The part composed of grommet 24 and compensation ring 34, which in turn has the shape of a simple perforated disc, is shown as a part which has already been connected, in this case connected by vulcanization, the wall 20 is placed on this part in the direction of the arrows and in the region of the connecting surface 38 annularly connected to the outer edge region of the compensation ring 34. The reinforcement ring 42, as is also true for the two reinforcement rings 42, 44 according to FIG. 1, is glued over the entire surface to the wall 20 centrally to the hole 22.

Im Ausführungsbeispiel nach Figur 3 wird als Kompensationsring 34 eine Art Faltenbalg verwendet, der aus zwei Lochscheiben 46, 48 zusammengesetzt ist. Die untere Lochscheibe 46 ist, wie dies für den gesamten Kompensationsring 34 nach den vorangegangenen Beispielsen erläutert wurde, flächig mit dem Befestigungsring 28 und der angrenzenden Tülle 24 verbunden. Rings um diesen Vulkanisationsbereich bleibt die untere Lochscheibe an ihren beiden Seiten frei. An ihrem äußeren Randbereich ist sie mit der oberen Lochscheibe 48 über eine ringförmige Verbindungsfläche 50 und vorzugsweise durch Vulkanisation verbunden. Auch die obere Lochscheibe bleibt auf einem Ringbereich innerhalb dieses Verbindungsbereichs 50 an beiden Seiten frei, sie ist an ihrem oberen Innenrandbereich entlang der ringförmigen Verbindungsfläche 38 flächig mit der Innenseite der Wandung 20 verbunden. Die Geometrie ist dabei, was jedoch nicht notwendig ist, so ausgeführt, daß die Verbindungsfläche 38 bis zum Rand des Loches 22 reicht und das Innenloch der Lochscheibe 48 den gleichen Durchmesser hat wie das Loch 22.In the exemplary embodiment according to FIG. 3, a type of bellows is used as the compensation ring 34, which is composed of two perforated disks 46, 48. The lower perforated disk 46 is, as has been explained for the entire compensation ring 34 according to the previous examples, connected flatly to the fastening ring 28 and the adjacent spout 24. The lower perforated disc remains free on both sides around this vulcanization area. At its outer edge area, it is connected to the upper perforated disk 48 via an annular connecting surface 50 and preferably by vulcanization. The upper perforated disk also remains free on both sides of an annular area within this connecting area 50; it is connected at its upper inner edge area along the annular connecting surface 38 to the inside of the wall 20. The geometry is, but is not necessary, such that the connecting surface 38 extends to the edge of the hole 22 and the inner hole of the perforated disk 48 has the same diameter as the hole 22.

Im Ausführungsbeispiel nach Fig. 3 sind keine Verstärkungsringe 42, 44 gezeigt. Derartige Ringe, sowohl an der Innenseite, wie auch an der Außenseite der Wandung 20 können jedoch vorgesehen werden. Das Ausführungsbeispiel nach Fig. 3 hat den Vorteil, daß bei Einsatz von Verstärkungsringen 42, 44 die Verbindungsfläche 38 im Inneren des verstärkten Bereichs und nicht, wie bei den Ausführungsbeispielen nach den Figuren 1 und 2, am Außenrand des verstärkten Bereichs liegt. Ein Verstärkungsring kann auch zwischen der Wandung 20 und der oberen Lochscheibe 48 angeordnet werden, wobei er entweder in die Verbindungsfläche 38 hineinragt oder sich außerhalb dieser befindet.In the exemplary embodiment according to FIG. 3, no reinforcement rings 42, 44 are shown. Such rings, both on the inside and on the outside of the wall 20 can, however, be provided. 3 has the advantage that when reinforcing rings 42, 44 are used, the connecting surface 38 lies inside the reinforced area and not, as in the case of the exemplary embodiments according to FIGS. 1 and 2, on the outer edge of the reinforced area. A reinforcement ring can also be placed between the tub manure 20 and the upper perforated disc 48 are arranged, it either protrudes into the connecting surface 38 or is located outside of this.

Da beim praktischen Betrieb nicht verhindert werden kann, daß Staub, Schmutz usw. zwischen Rohrstutzen 26 und Loch 22 in den Bereich zwischen Wandung 20 und Kompensationsring 34 bzw. zwischen die Lochscheiben 46, 48, gelangt, ist zwischen dem Rohrstutzen 26 und der Außenseite der Wandung 20 ein sehr elastischer, weicher Balg 52 angeord net. Aufgrund einer Verdickung 54 verhinderter zudem, daß die Tülle 24 übermäßig weit in den Innenraum des Kissens gedrückt werden kann. Die Verdickung 54 kann auch anderweitig realisiert werden.Since it cannot be prevented in practical operation that dust, dirt etc. between pipe socket 26 and hole 22 in the area between wall 20 and compensation ring 34 or between the perforated disks 46, 48, is between the pipe socket 26 and the outside of the Wall 20 is a very elastic, soft bellows 52 angeord net. Due to a thickening 54 also prevented that the spout 24 can be pressed excessively far into the interior of the pillow. The thickening 54 can also be realized in another way.

Für den praktischen Betrieb wird, wie dies ansich bekannt ist, in die Tülle 24 ein Metallnippel eingesetzt, der mittels einer handelsüblichen Rohrschelle befestigt wird. Weiterhin übergreift eine äußere Stutztülle das Ventil. Diese Teile sind nicht dargestellt, sie sind bekannt.For practical operation, as is known per se, a metal nipple is inserted into the spout 24, which is fastened by means of a commercially available pipe clamp. Furthermore, an outer nozzle grips over the valve. These parts are not shown, they are known.

Claims (9)

1. A low-pressure lifting bag having an airtight chamber the wall (20) of which consists of a fabric covered with rubber or plastic and a valve fitted in this wall (20) having a nozzle (24) which comprises a pipe socket (26) inserted through a hole 22 in the wall (20) and a ring-fastener (28) attached to this pipe socket (26) and linked with the inner side of the wall (20), characterized in that between the ring-fastener (28) and the wall (20) there is arranged a compensation-ring (34) which is of greater external diameter than the ring-fastener (28) and which on the one side is so arranged with the ring-fastener (28) and on the other via a ring-shaped joining-surface (38) is so attached to the wall (20) that between this joining-surface (38) and the outside edge of the ring-fastener (28) there remains a ring-shaped compensation area (36) on which the compensation-ring (34) is linked neither with the wall (20) nor with the nozzle (24).
2. Low pressure lifting air bag according to Claim 1, characterized in that the compensation-ring (34) is made of a material which has greater elasticity than the ring-fastener (28) and the material of the wall (20).
3. Low-pressure lifting bag according to Claims 1 or 2, characterized in that on at least one side of the wall (20) concentric to the hole (22) there is at least one reinforcing ring (42, 44) attached areally.
4. Low-pressure lifting bag according to Claim 3, characterized in that the external diameter of a reinforcing ring (42) is greater than the diameter of the inner edge of the ring-shaped joining-surface (38).
5. Low-pressure lifting bag according to Claims 3 or 4, characterized in that the internal diameter of the disk-shaped reinforcing rings (42, 44) corresponds to the inner diameter of the hole (22).
6. Low-pressure lifting bag according to one of the Claims 1 to 5, characterized in that the compensation-ring (34) is a flat circular disk which on one side is attached areally to the ring-fastener (28) and on the other side in the region of the joining-surface (38) is attached areally in ring-shape to the wall (20) in such a way that between the two joining surfaces the ring-shaped compensation zone (36) remains on both sides free.
7. Low-pressure lifting bag according to one of the Claims 1 to 5, characterized in that the compensation-ring (34) is composed of at least two perforated disks (46, 48) which form a bellow to which a lower perforated disk (46) is linked to the ring-fastener (28) preferably by vulcanization and an upper perforated disk (48) is linked to the wall (20) if necessary by the insertion of a reinforcing ring (44).
8. Low-pressure lifting bag according to Claim 7, characterized in that an even number of perforated disks (46, 48), especially two, are employed and that the inner edge of the joining surface (38) corresponds with the inner edge of the hole (22).
9. Low-pressure lifting bag according to one of the Claims 1 to 8, characterized in that between the pipe socket (26) and wall (20) a soft bellow 52 prevents the entry of dirt to the compensation-ring (34).
EP87101624A 1986-02-13 1987-02-06 Low pressure lifting bag having an airtight chamber with a valve Expired EP0237756B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863604435 DE3604435A1 (en) 1986-02-13 1986-02-13 LOW PRESSURE LIFTING PILLOW WITH AN AIRTIGHT CHAMBER AND A VALVE IN THIS
DE3604435 1986-02-13

Publications (2)

Publication Number Publication Date
EP0237756A1 EP0237756A1 (en) 1987-09-23
EP0237756B1 true EP0237756B1 (en) 1989-08-23

Family

ID=6293960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87101624A Expired EP0237756B1 (en) 1986-02-13 1987-02-06 Low pressure lifting bag having an airtight chamber with a valve

Country Status (3)

Country Link
US (1) US4907781A (en)
EP (1) EP0237756B1 (en)
DE (2) DE3604435A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5938179A (en) * 1994-05-25 1999-08-17 Res Q Technology, Inc. Bag and method of constructing the same
DE102007014467A1 (en) 2007-03-22 2008-09-25 Vetter Gmbh Portable rescue unit for disasters

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US975258A (en) * 1910-02-26 1910-11-08 William E Kurtz Pneumatic-cushion furniture.
US1486241A (en) * 1922-03-13 1924-03-11 William A Gibson Pneumatic jack
US1492158A (en) * 1922-06-06 1924-04-29 Caretta Ettore Lifting jack
US1752101A (en) * 1926-12-22 1930-03-25 Meutsch Heinrich Mining prop
FR993432A (en) * 1949-06-21 1951-10-31 Lifting jack for motor vehicles
US3026541A (en) * 1959-10-27 1962-03-27 Adolf R Murat Pneumatic lifter for bed patient
AT317485B (en) * 1971-11-18 1974-08-26 Vetter Manfred Inflatable, sack-like or pillow-like container made of airtight fabric for lifting, supporting or moving loads
GB1405888A (en) * 1971-11-22 1975-09-10 Mfc Survival Ltd Fluid pressure lifting bags
GB1604141A (en) * 1978-01-05 1981-12-02 Modern Precision Engs & Associ Air cushion lifting device

Also Published As

Publication number Publication date
DE3760470D1 (en) 1989-09-28
DE3604435A1 (en) 1987-08-27
EP0237756A1 (en) 1987-09-23
DE3604435C2 (en) 1989-04-13
US4907781A (en) 1990-03-13

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