Plunger for dispenser, dispenser, and method for dispensing liquid material
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United States of America Patent
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Oct 24, 2017
Grant Date -
Aug 27, 2015
app pub date -
Sep 30, 2013
filing date -
Oct 1, 2012
priority date (Note) -
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Abstract
The present invention provides a plunger (20) for a dispenser, the plunger including a large diameter body portion (23) provided with ring-shaped contact surfaces (24, 25) that contact an inner wall surface of a syringe, a rear opening (26) formed in a backside of the large diameter body portion (23), and a small diameter body portion (22) provided with a front opening (28), wherein the front opening (28) is formed in a size allowing a liquid material to be directly pressed by pressurized air, and allowing at least the plunger (20) to move following a fall in water head position, which is caused with discharge and consumption of the liquid material. With those features, the liquid material can be prevented from adhering to the inner wall surface of the syringe, and the liquid material in the syringe can be prevented from flowing backwards.
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