Compound railway spring assembly

Claim 1

In a railway vehicle having a body bolster supported by spring means on the bolster of a railway truck, said body bolster defining air reservoir means with bottom plate means having an opening therein, comprising, cup means disposed within said opening, said cup means having a top wall and a downwardly extending sidewall with a lower edge portion adjacent the margins of said opening in said bottom plate means, coil spring means disposed aloNg a vertical axis between said body bolster and said truck bolster and including a top portion received in said cup means and a bottom portion supported by said truck bolster, elastomer ring means secured to said sidewall of said cup means adjacent its lower edge, means securing said elastomer ring means to said bottom plate means to seal said opening, said elastomer ring means having a property of being relatively flexible in a vertical direction to enable said cup means to function as a piston in said reservoir, said elastomer ring means being relatively incompressible in a direction transverse to said vertical axis, leaving lateral movement between the bottom plate means of said body bolster and the bolster of the truck to be taken in lateral deflection by said coil spring means.