| 摘要 |
A mechanism for opening and closing a mercury sphygmomanometer having a set of blood pressure measuring means mounted on the inner side of a cover pivotally attached to a casing and a lever actuated in response to an operation of pivoting the cover such that the lever selects an opening or closing position of a valve provided in between a mercury passage and a mercury reservoir in response to an operation of pivoting the cover. The lever is provided with two abutments which are disposed in a predetermined angular relation to each other with respect to the pivot point of the lever. One of the abutments is movable by a manual operation to select a valve opening or closing position.
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