| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a vessel which can reduce the remaining quantity of a filled matter such as grease and oil, remaining inside after use. <P>SOLUTION: Since a bottom 16C of a bellows portion 16 is composed of a ridge portion 16A, a radial length becomes greater than when the bottom 16C is composed of a valley portion 16B. This can impart strength to the bottom 16C. Thus, since the strength of the bottom 16C increases even if a predetermined suction force acts on the bottom 16C of the bellows portion 16, the bottom 16C subjected to the suction force can be prevented from being dented. Consequently, when the bellows portion 16 is contracted, the bottom 16C moves axially downward while maintaining an almost parallel state. In the fully contracted state of the bellows portion 16, the amount of the protrusion of the radial outside end of the bottom 16C to the upside can be reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
