Importance

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Abstract

The lower end of a first hollow vertical cylinder is connected to the upper end of a second vertical hollow cylinder of smaller diameter. A first outer hollow stem open at its ends has an intermediately disposed first external enlargement disposed below the top open end of the first cylinder. A hollow vertical main piston is vertically slidable within the first cylinder. A second inner stem has an upper vertical section which extends upwardly through the main piston and through a bore in the first stem. A vertical fluid discharge path is formed between the upper section and the first stem. An integral lower vertical section of the second stem engages the lower end of the main piston. A fluid discharge port is formed between the first section and the stem. A vertical inner piston is slidable in the second cylinder. A first spring normally biases the stems together, closing the discharge port. A second spring causes the discharge port to open during a selected point on the downstroke.

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First Claim