| 摘要 |
A device intended for changing the inner volume of a container, such as containers or packages for chemicals, drugs, etc, and pressure chambers for breathing apparatuses, comprising a base plate (1) and an upper plate (2) which are made of a rigid material, and an expansion means (3) provided between the base plate (1) and the upper plate (2). Two pressure means (5,b) which are formed as levers and which can be manually actuated are pivotly provided at a support (6) fixedly connected with the central part of the upper plate (2), which support projects through a recess (12) in the base plate (1). A resilient means (9) is provided between the pressure means (5a,b) to make an axial displacement of the plates (1, 2) in relation to each other possible. The expansion means has the form of an elastic seal (3) which is provided in a groove (13) formed in the edge (11) of the base plate (1), which seal when the plates (1, 2) are approaching each other is pressed together and expands radially for contact with the wall of the container.
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