Air conveyor for gas-sampling tubes
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United States of America Patent
Stats
-
Jan 15, 1991
Grant Date -
N/A
app pub date -
Oct 19, 1989
filing date -
Oct 21, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An air conveyor for a gas-sampling tube that is used for detecting foreign gases or suspended substances in air is described. The air conveyor comprises a body, serving as a handle, that has a control rod which is guided and lockable in a through-duct therein, and which is connected at one end to a bellows that serves as a suction element. The beginning and the end of the suction stroke is uniquely determined by a locking and releasing mechanism connected to the control rod thereby ensuring an exactly reproducible stroke volume. The locking and releasing mechanism utilizes two lever-like linkages, each provided with a hook, which are pivotally disposed in the body one under the other and parallel to the control rod. The free end of the control rod has at least one recess which is in operative connection with the hook on the first lever to secure the control rod in position at the beginning of a suction stroke and with the hook on the second lever to secure the control rod in position at the end of the suction stroke.
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