Importance

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Abstract

The lower end of a first hollow vertical cylinder curves inwardly to merge with the upper end of a lower second cylinder. A hollow vertical piston extends through a top opening of the first cylinder into the first cylinder and is vertically movable therein with a lower end of the piston slidably engaging the inner surface of the first cylinder. A vertical member has upper and lower integral sections, the lower section being enlarged with respect to the upper portion, the upper section being engagable or disengagable with the upper end of the piston to define a first closed or open port therewith. A third vertical hollow cylinder has a lower end in continuous fluid sealing engagement with the inner surface of the second cylinder. An upper end of the third cylinder is engagable or disengagable with the lower section to define a second closed or open port therewith. The first port is open when the second port is closed and vice versa. A spring bears against a lower end of the second cylinder and extends upwardly within the third cylinder to engage the lower section and also to engage the upper end of the third cylinder when the lower section is separated from the third cylinder. The spring has fully extended and fully compressed positions.

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First Claim