发明授权
US4310104A Vacuum bottle with bellows pump 失效
真空瓶带波纹管泵

Vacuum bottle with bellows pump
摘要:
There is disclosed a vacuum bottle with a bellows pump adapted to feed air into the interior of the inner bottle to increase the internal pressure therein, thereby pouring the liquid in the inner bottle therefrom through the pumping tube and pouring tube.The bellows pump comprises a bellows body integrally molded with a bottom having an air outlet, a return spring arranged in the bellows body, a bellows cap movably mounted in an air inlet formed at the central portion of an upper plate of the bellows body, and an externally threaded cylindrical fixing member having an upper flange and being provided with an air tube at its bottom, the fixing member being inserted in the air outlet of the bellows body and screwed in an internally threaded bore provided in the bottom of the lid body so as to place an internal edge of the bottom of the bellows body forming the air outlet between the upper flange of the fixing member and the bottom of the lid body, thereby incorporating the bellows pump as an integral part of the lid body, the return spring being placed between said bellows cap and the fixing member. The vacuum bottle of the above construction is easy in assembly operation and excellent in durability.
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