Cushion

Abstract

A cushion comprises a metal plate and a container. The metal plate includes a plurality of positioning members projecting from a periphery thereof. The container includes an upper piece and a lower piece that together define an interior space therebetween. An inlet is defined in the lower piece, allowing filling of liquid into the interior space. The positioning members extend into the interior space of the container and are integrally formed with the container such that the positioning members are fixed to the container.

What is claimed is:  
     
         1 . A cushion comprising a metal plate and a container, the metal plate including a plurality of positioning members projecting from a periphery thereof, the container including an upper piece and a lower piece that together define an interior space therebetween, an inlet being defined in the lower piece, allowing filling of liquid into the interior space, the positioning members extending into the interior space of the container and being integrally formed with the container such that the positioning members are fixed to the container.  
     
     
         2 . The cushion as claimed in  claim 1 , wherein the metal plate includes a plurality of rows of through-holes.  
     
     
         3 . The cushion as claimed in  claim 1 , wherein the upper piece includes a plurality of ribs, thereby defining a plurality of air channels between the ribs and outside two outermost ones of the ribs.  
     
     
         4 . The cushion as claimed in  claim 2 , wherein the upper piece includes a plurality of ribs, thereby defining a plurality of air channels between the ribs and outside two outermost ones of the ribs.