EP0237756B1 - Niederdruck-Hebekissen mit einer luftdichten Kammer und einem in dieser angeordneten Ventil - Google Patents

Niederdruck-Hebekissen mit einer luftdichten Kammer und einem in dieser angeordneten Ventil 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
Authority
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
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0237756A1 (de
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vepro GmbH filed Critical Vepro GmbH
Publication of EP0237756A1 publication Critical patent/EP0237756A1/de
Application granted granted Critical
Publication of EP0237756B1 publication Critical patent/EP0237756B1/de
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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Check Valves (AREA)
  • Diaphragms And Bellows (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
EP87101624A 1986-02-13 1987-02-06 Niederdruck-Hebekissen mit einer luftdichten Kammer und einem in dieser angeordneten Ventil Expired EP0237756B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3604435 1986-02-13
DE19863604435 DE3604435A1 (de) 1986-02-13 1986-02-13 Niederdruck-hebekissen mit einer luftdichten kammer und einem in dieser angeordneten ventil

Publications (2)

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

Family

ID=6293960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87101624A Expired EP0237756B1 (de) 1986-02-13 1987-02-06 Niederdruck-Hebekissen mit einer luftdichten Kammer und einem in dieser angeordneten Ventil

Country Status (3)

Country Link
US (1) US4907781A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
EP (1) EP0237756B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (2) DE3604435A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

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 (de) 2007-03-22 2008-09-25 Vetter Gmbh Tragbare Rettungseinheit für Katastrophenfälle

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 (fr) * 1949-06-21 1951-10-31 Cric de levage pour véhicules automobiles
US3026541A (en) * 1959-10-27 1962-03-27 Adolf R Murat Pneumatic lifter for bed patient
AT317485B (de) * 1971-11-18 1974-08-26 Vetter Manfred Aufblasbarer, sack- oder kissenartiger Behälter aus luftdichtem Gewebe zum Heben, Stützen oder Verschieben von Lasten
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
EP0237756A1 (de) 1987-09-23
US4907781A (en) 1990-03-13
DE3604435C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1989-04-13
DE3604435A1 (de) 1987-08-27

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