When flat rubber sandwich springs are placed symmetrically to form a wedge, compressive and shear strains will be imposed in the rubber simultaneously under action of the load. This combined compression and shear stress in the rubber is specially advantageous to its strength. Additional bending stresses which are unavoidable in simple shear loading are reduced by the superimposition of the compressive stresses. Bending stresses can even be completely eliminated if the rubber bodies take the form of a parallelogram whose centerline follows the direction of the compression-shear resultant. The same compressive and shear stress will then arise at every point.
Wedge rubber spring are particularly interesting for the designer as they defect in three directions and at the same time possess very different stiffness in each of the directions of their three main axes. It is a wedge rubber spring designed with special care. The rubber is protected against mechanical damage and attack from oil. The rubber spring can easily be attached both to the machine and to the floor.
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