| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a dispenser which keeps operation load of a plunger stable and prevents the content from leaking after stopping a pressing operation. <P>SOLUTION: The dispenser comprises: a syringe body 1 having a filling space of the content and one end equipped with a pouring nozzle; a plunger 2 sliding inside the syringe body 1 by the application of a pressing force to pour the content inside a filling space m from the tip of the pouring nozzle; and an O ring 3 disposed in an annular groove part 2c formed at the tip portion of this plunger 2 and slidable along the inner wall surface of the syringe body 1, wherein the annular groove part 2c is formed in a partitioned recess having a flat bottom wall over the whole region. The side wall of the annular groove part 2c is provided with projections or grooves 4 for guiding a back suction of the content by releasing the load applied by the pressing of the plunger 2, sliding the plunger 2 in the reverse direction to the pressing direction of the plunger 2 by its restoring force, while contacting, elastic displacing, and further compression deforming the side part of the O ring 3 according to the pressing of the plunger 2. <P>COPYRIGHT: (C)2008,JPO&INPIT |
