Patent ID: 7237729

Claim:
A sprayer with a changeable volume comprising: a container comprising a lower wall defining a space and an upper wall defining a space, with the lower wall being a rigid structure including a bottom peripheral partition extending upwardly to a bottom height from a bottom partition, with the upper wall including an upper peripheral partition extending downwardly from an upper partition, with the bottom and upper peripheral partitions of the upper and lower walls being interconnected, with the space of the lower wall and the space of the upper wall being in direct communication with each other for containing water, with the upper peripheral partition of the upper wall being expandable between a compressed height less than the bottom height and an extended height greater than the bottom height; a pump in the space defined in the lower wall and within the bottom height; a first pipe directed to the pump from the space defined in the lower wall; a second pipe directed to the exterior of the container from the pump; and a nozzle connected to the second pipe.