Abstract: The present invention is directed to a carbonated beverage shaking machine which is designed to develop an equilibrium pressure in a beverage container. A support structure is provided which includes two parallel rods connected at one end to a base and an adjustable crossbar pivotally mounted adjacent the free ends of the rods. By adjusting the crossbar relative to the parallel rods the machine may accommodate a variety of various sizes of conventional beverage containers. The machine is designed to initially support a beverage container on the base portion in a vertical, upright position. Subsequently, the adjustable crossbar is lowered into position and locks the beverage container to the support frame. Simultaneously with the lowering of the crossbar, the beverage container is pierced with a needle which is connected to parameter measuring devices, such as a pressure gauge and a thermometer.