GB1578864A - Resilient support comprising a shock-absorbing block with a cavity therein - Google Patents

Description

PATENT SPECIFICATION

( 21) Application No 8587/79 ( 62) Divided out of No 1 578 863 ( 31) Convention Application No ' 7 613 618 7 707 019 ( 22) Filed 5 May 1977 S ( 32) Filed 6 May 1976 9 March 1977 in France (FR)

Complete Specification Published 12 November 1980

INT CL 3 F 16 F 1/36 Index at acceptance F 2 S 704 705 CF Inventor MICHEL POMPEI ( 54) RESILIENT SUPPORT COMPRISING A SHOCK-ABSORBING BLOCK WITH A CAVITY THEREIN ( 71) We, PAULSTRA, a Body Corporate organised and existing under the laws of France, of 61 Avenue Marius-Aufan, 92305 Levallois-Perret, France, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:-

The present invention relates to a resilient support for interposition between two structures comprising at least one block of elastomer.

It has already been proposed, for absorbing vibration and shocks, to interpose resilient supports between two structures, for example the body or engine of a vehicle and its chassis or a freight container and the vehicle, aeroplane, or ship on which it is carried.

It is also known for these resilient supports to comprise blocks of elastomer with cavities therein so that the elastomer initially works in flexion and shear and then, when the cavities are closed works in compression.

In accordance with the present invention there is provided a resilient support for interposition between two structures comprising at least one block of elastomer having pairs of parallel faces, the faces of one pair being offset with respect to each other and bonded to respective plates which are to be attached to the two structures, the block also having a cavity whose axis extends parallel to the said one pair of faces and whose cross-section is elongated in a direction joining the said one pair of faces which is oblique to each face of the said one pair of faces.

In a preferred embodiment two resilient supports of this kind are arranged to form a resilient mounting between an apparatus and a base, the cavities of the two resilient supports being disposed symmetrically on opposite sides of an axis of the assembly.

Preferably, in each resilient support the block has a second pair of faces orthogonal to the first pair, each of the plates bonded to the faces of the first pair is integral with an orthogonal plate bonded to a respective face of the second pair, and the block has a sec 50 ond cavity whose axis is parallel to that of the first cavity and whose cross-section is elongated in a direction parallel to that of the first cavity.

The invention will now be described in 55 more detail with the aid of examples illustrated in the accompanying drawing, in which:Fig 1 shows schematically in vertical section a resilient mounting comprising two 60 resilient supports in accordance with the invention, Fig 2 is a perspective view of a resilient support suitable for use in the mounting of Fig 1, 65 Fig 3 is a perspective view of a second form of resilient support in accordance with the invention, and Fig 4 is a vertical section similar to that of Fig 1 showing a resilient mounting using the 70 support of Fig 3.

Referring to Fig 1, this shows a resilient mounting for supporting an assembly A on a fixed or movable base B Several resilient supports are employed each comprising a 75 pair of parallel metal plates 1 attached to opposite but offset faces of a block 2 of elastomer which is formed with a cavity 3 The axis of the cavity 3 lies parallel to the said faces of the block 2 and the cross-section of 80 the cavity is elongated in a direction joining the said faces and oblique to each of them.

The number of resilient supports provided can be varied They are preferably arranged along the edges of the assembly A and 85 advantageously in such positions that their cavities are symmetrical in relation to the central axis X-X of the assembly A.

As shown in Fig 2 the plates 1 are provided with holes 6 for attachment of the resi 90 c W ( 11) 1 578 864 ( 33) ( 44) ( 51) ( 52) ( 72) 1 578 864 lient supports to the assembly A and base B. When shocks and vibrations are applied in a vertical direction, as shown by the arrow F in Fig 1, these are absorbed by the resilient supports Initially the faces of the elastomer adjacent to the cavities 3 work in flexion and by shearing If the forces are large enough to close the cavities, the elastomer will then work in compression It is evident that the supports are also deformable in directions perpendicular to the vertical direction but the elastomer then works differently.

Figs 3 and 4 concern resilient supports constructed to withstand forces applied in two perpendicular directions In this case each of the metal plates 1 is integral with a second orthogonal plate to form a dihedron, the block 2 has two pairs of parallel faces which are perpendicular to one another and bonded to corresponding parts of the plates 1 and the block 2 has a second cavity 3 whose axis is parallel to that of the first cavity and whose cross-section is elongated in a direction parallel to that of the first cavity.

Such bi-directional supports will behave similarly whether the applied forces are in the vertical direction X (Fig 4) or in the perpendicular direction Y In each case the initial flexion and shear is followed by compression when the cavity is closed up.

Reference is made to our Application No.

18935/77 (Serial No 1578863), from which the present application has been divided In that application the invention claimed is a resilient support for interposition between two structures comprising at least one block of elastomer bonded on the one hand to a fixing element for attachment to one of the structures and on the other hand to three orthogonal metal plates for attachment to the other structure, the block having respective cavities disposed between the fixing element and each of the orthogonal plates.

Claims (4)

WHAT WE CLAIM IS: 45

1 A resilient support for interposition between two structures comprising at least one block of elastomer having pairs of parallel faces, the faces of one pair being offset with respect to each other and bonded to 50 respective plates which are to be attached to the two structures, the block also having a cavity whose axis extends parallel to the said one pair of faces and whose cross-section is elongated in a direction joining the said one 55 pair of faces which is oblique to each face of the said one pair of faces.

2 A resilient support as claimed in claim 1 in which the block of elastomer has a cross-section transverse to the axis of the 60 cavity in the form of a parallelogram.

3 A resilient support as claimed in claim 1 in which the block has a second pair of faces orthogonal to the first pair, each of the plates bonded to the faces of the first 65 pair is integral with an orthogonal plate bonded to a respective face of the second pair, and the block has a second cavity whose axis is parallel to that of the first cavity and whose cross-section is elongated in a 70 direction parallel to that of the first cavity.

4 A resilient mounting for interposition between an apparatus and a base, the mounting comprising two resilient supports in accordance with any one of claims l to 3 75 whose cavities are disposed symmetrically on opposite sides of an axis of the assembly.

A resilient support substantially as described with reference to Figs 1 and 2 or Figs 3 and 4 of the accompanying drawing 80 REDDIE & GROSE Agents for the Applicants 16 Theobalds Road London WC 1 X 8 PL.

Printed for Her Majesty's Stationery Office by The Tweeddale Press Ltd, Berwick-upon-Tweed, 1980 Published at the Patent Office, 25 Southampton Buildings London, WC 2 A IAY, from which copies may be obtained.