EP1080030A1 - Coussin de levage - Google Patents

Coussin de levage

Info

Publication number
EP1080030A1
EP1080030A1 EP99910557A EP99910557A EP1080030A1 EP 1080030 A1 EP1080030 A1 EP 1080030A1 EP 99910557 A EP99910557 A EP 99910557A EP 99910557 A EP99910557 A EP 99910557A EP 1080030 A1 EP1080030 A1 EP 1080030A1
Authority
EP
European Patent Office
Prior art keywords
cushion
major portions
opposed major
spacing members
pair
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99910557A
Other languages
German (de)
English (en)
Inventor
David Bernard Di Jones
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.)
MFC Survival Ltd
Original Assignee
MFC Survival Ltd
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 MFC Survival Ltd filed Critical MFC Survival Ltd
Publication of EP1080030A1 publication Critical patent/EP1080030A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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 present invention relates to a lifting cushion for supporting, raising or moving objects.
  • Lifting cushions of the invention may for example be used for rescuing people who are trapped by collapsible walls, girders, concrete slabs or road vehicles.
  • lifting cushions can also be used for prising steering columns, removing windscreens and for forcing doors.
  • Industrial uses of lifting cushions include lifting heavy machinery, rail locomotives and pipelines, supporting tensioning in mining, splitting slabs in quarries, and use as compression or spreader elements.
  • the lifting cushion is placed in its flattened condition beneath the object to be raised, and the cushion is then inflated thereby raising the object. If further lift is required one or more lifting cushions may be inserted one above the other and subsequently inflated to provide a required degree of lift of the object.
  • lifting cushions are generally of rectangular form.
  • This change in shape of the cushion considerably reduces the contact area between the cushion area and the object to be raised thereby producing a corresponding reduction in the lifting force that can be applied by the cushion to the object.
  • an inflatable lifting cushion comprising an inner layer extending in a first direction and folded over on itself with its folded end regions overlapping to define an inner pair of spaced opposed major portions, an outer layer extending in a second direction and folded around the first layer with its folded end regions overlapping to define an outer pair of spaced opposed major portions located on said first pair of spaced opposed major portions, and a plurality of spacing members located between said inner pair of spaced opposed major portions to retain said outer pair of spaced opposed major portions at a preselected attitude to one another when the lifting cushion is fully inflated.
  • the cushion is rectangular and the first and second directions of the layers are at 90° to one another and extend parallel to first and second sides of the cushion.
  • Each spacing member may extend through opposed slits in the inner pair of spaced opposed major portions with opposed facing end portions of the spacing members connected to the outer surfaces of the said inner pair of spaced opposed major portions.
  • the two layers -3 - and the spacing members may be constructed of a polyaramid material such as polyaramid cord, and the first and second layers and the spacing members may be coated with an air retaining rubber compound such as neoprene .
  • Figure 1 is a sectional elevation of part of a lifting cushion of the invention.
  • Figure 2 is a perspective view of the inner and outer layers of the lifting cushion of Figure 1.
  • a lifting cushion of the invention includes an inner layer 2 consisting of a rectangular sheet 4 made of polyaramid cord coated with a neoprene layer on both its upper and lower surfaces.
  • the width and length of the sheet 4 are chosen to provide a lifting cushion of the required dimensions, and to provide an inner pair of spaced opposed major portions 6 and 8 with the sheet end edges 10 overlapping one another in the centre of the lifting cushion.
  • the direction of reinforcement of the sheet 4 extends in the direction 12.
  • opposed slits 14 extend along the length of the major portions 6 and 8 of the sheet 4 and these slits 14 end at a distance of 60mm from the curved end portions of the sheet 4.
  • the major portions 6 and 8 of the sheet 4 are connected by a plurality of spacing members 16 which extend along the length of the major portions 6 and 8 in a direction perpendicular to the plane of Figure 1.
  • These spacing members are of generally U-shaped cross-section when the cushion is fully inflated, and are made of polyaramid cord coated with an air retaining rubber compound such as neoprene.
  • Each spacing member 16 consists of end arms 18 and 20 connected by a spacer portion 22, and is threaded through associated opposed slits 14 in the major portions 6 and 8 so that the end arms 18 and 20 extend along the outer surfaces of the major portions 6 and 8.
  • the spacing members 16 When the cushion is deflated, the spacing members 16 are of generally V shaped cross-section with each spacer portion 22 folded along its centre line so that each end member 18 and 20 is parallel to its adjacent half of its associated spacer portion 22.
  • Strips of uncured rubber/neoprene having the same length as the slits 14 and of L transverse cross-section are positioned against the inner opposed surfaces of the major portions 6 and 8 and spacer portions 22 of each spacing member to fill a gap left at the corners of each spacing member and its associated part of the major portions 6 and 8.
  • Strips of melamine or other suitable barrier material are laid onto the inner surfaces of the major portions 6 and 8 to prevent these opposing inner surfaces sticking together during the hot vulcanising of the assembly when providing the finished lifting cushion.
  • the surfaces of the sheet 4 and the spacing members 16 are coated with an air retaining rubber compound such as neoprene thereby enabling the components to be vulcanised -5- to the other components of the lifting cushion.
  • An outer layer 24 consists of an outer rectangular sheet 26 which is made of polyaramid cord and is coated with a neoprene layer on both its upper and lower surfaces the same as the first sheet 4 except that all its directions and dimensions are rotated through 90°.
  • the sheet 26 has the same width as the length of the folded sheet 4, and the length of the sheet 26 is chosen so that it can be wrapped round the inner layer 2 with its end edges 28 overlapping in the centre of the cushion.
  • the inner and outer layers 2 and 24 are carefully pressed by a roller in order to prevent air from being trapped in the two layers . Any such trapped air would breathe during inflation and evacuation of the lifting cushion thereby producing unwanted separation of the components of the cushion.
  • the inner layer 2, the spacing members 16, the L cross- section strips and the melamine strips are assembled as herein described, and the inner layer 2 is folded over so that its end edges 10 overlap one another in the centre of the lifting cushion.
  • the rubber nipple of an air valve is inserted into one corner of the folded inner layer 2 with the attached nozzle of the air valve extending from the inner layer 2.
  • the assembly is then hot vulcanised to secure the components to one another.
  • the folded sheet 4 of the inner layer 2 is then placed on the centre portion of the laid out outer layer 24 which is located at 90° to the folded inner sheet 4.
  • the sheet 26 of the outer layer 24 is then folded over the inner sheet 4 so that the two end edges 28 of the outer sheet 26 overlap one another on the -6- opposite face of the lifting cushion to the end edges 10 of the inner sheet 4. In this folded position an outer pair of opposed major portions 32 and 34 of the sheet 26 are located on the inner major portions 6 and 8 of the sheet 4.
  • the direction of reinforcement 30 of the outer sheet 26 runs perpendicularly to the direction of reinforcement 12 of the inner sheet 4.
  • the folded sheet 26 is hot vulcanised to secure the sheet 26 to the sheet 4 to produce the finished lifting cushion in which the sheets 4 and 26, the spacing members 16 and the rubber/neoprene strips become homogenous to close the slits 14.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Laminated Bodies (AREA)
  • Mattresses And Other Support Structures For Chairs And Beds (AREA)

Abstract

Un coussin de levage destiné à lever ou à porter des objets lourds comprend des couches intérieure et extérieure (2 et 24), ainsi que des éléments d'espacement (16), tous en câble polyaramide et revêtus de néoprène. La couche intérieure (2) est repliée afin de former deux parties principales opposées (6 et 8) présentant des fentes parallèles opposées (14). Des éléments d'espacement (16) ayant la forme générale d'un U s'étendent à travers les fentes opposées (14), les bras terminaux opposés (18, 20) des éléments d'espacement (16) étant reliés aux surfaces extérieures des parties principales opposées (6 et 8). Les écartements entre les éléments d'espacement (16) et les parties principales opposées (6 et 8) sont fermés par des bandes en caoutchouc et en néoprène non vulcanisé. La couche intérieure repliée (2), les éléments d'espacement (16) et les bandes sont fixés ensemble par vulcanisation à chaud. La couche intérieure repliée (2) est ensuite placée dans la partie centrale de la couche extérieure (24) posée. Cette couche extérieure (24) est ensuite repliée sur la couche intérieure (2) de manière que les bords terminaux (28) de la couche extérieure (24) se chevauchent. L'ensemble est ensuite vulcanisé à chaud afin de fixer ensemble les composants pour obtenir le coussin de levage fini.
EP99910557A 1998-03-23 1999-03-19 Coussin de levage Withdrawn EP1080030A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9806183.1A GB9806183D0 (en) 1998-03-23 1998-03-23 A lifting cushion
GB9806183 1998-03-23
PCT/GB1999/000872 WO1999048798A1 (fr) 1998-03-23 1999-03-19 Coussin de levage

Publications (1)

Publication Number Publication Date
EP1080030A1 true EP1080030A1 (fr) 2001-03-07

Family

ID=10829080

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99910557A Withdrawn EP1080030A1 (fr) 1998-03-23 1999-03-19 Coussin de levage

Country Status (5)

Country Link
EP (1) EP1080030A1 (fr)
JP (1) JP2002507531A (fr)
AU (1) AU2948499A (fr)
GB (1) GB9806183D0 (fr)
WO (1) WO1999048798A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2930464A1 (fr) * 2008-04-28 2009-10-30 Air Liquide Procede de fabrication d'un echangeur de chaleur a plaques utilisant une cale amovible

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1279266A (en) * 1969-11-20 1972-06-28 M F C Survival Ltd Fluid pressure lifting bags
GB1405888A (en) * 1971-11-22 1975-09-10 Mfc Survival Ltd Fluid pressure lifting bags
GB9309785D0 (en) * 1993-05-12 1993-06-23 Jones David B A lifting crushion
GB9718502D0 (en) * 1997-09-01 1997-11-05 Jones David B A lifting cushion

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9948798A1 *

Also Published As

Publication number Publication date
WO1999048798A1 (fr) 1999-09-30
AU2948499A (en) 1999-10-18
JP2002507531A (ja) 2002-03-12
GB9806183D0 (en) 1998-05-20

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