| 摘要 |
A sphygmomanometer, measuring capillary joined to a mercury storage tank by means of an internal passageway, is provided with a shut-off device for selectively blocking and opening the passageway. The shut-off device has a valve housing including a valve chamber which intersects the passageway and which terminates internally in a valve seat. A locking piece is mounted inside the valve chamber for rectilinear movement, with respect to the valve seat, from a closed position in engagement with the valve seat wherein the passageway is blocked, to an open position removed from the valve seat wherein the passage is open. The locking piece is biased in its open position by means of a spring arrangement, and a lever arrangement including a detenting mechanism is provided to move the locking piece to its closed position and to releasably lock it there.
|
