Importance

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Abstract

A dispensing device is disclosed which includes a tubular body having front and rear ends, the body having a central bore which narrows at the front thereof to form a tip. A piston is slidable in the bore, the bore space in the body forward of the piston defining a chamber. A supply bottle is removably mounted at the rear of the piston. The piston has a communicating passage between the bottle and the chamber. A first one-way valve means restricts flow in the communicating passage to occur only from the bottle toward the chamber. Also, a second one-way valve means restricts flow as between the chamber and the tip to occur only from the chamber toward the tip. The first one-way valve means includes a hollow valve body having one end which opens into the chamber and at least one port which communicates between the communicating passage and the inner region of the valve body. A tubular resilient element is fitted against the inner surface of the valve body, and acts as a seal, under even very small back pressure.

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First Claim