Gas flow valve, and automatic sphygmomanometer using same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 2, 1991
Grant Date -
N/A
app pub date -
Mar 21, 1990
filing date -
Mar 29, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A gas flow valve is provided in a pressure operated part to obtain an air flow velocity conforming to a change in pressure. A main body comprises a resilient member and is tapered from a base end to a distal end thereof to form a wedge-shaped portion at the distal end. In use, surfaces of the wedge-shaped portion serve as pressure-responsive surfaces, and gas is fed through a linear slit formed in the tip of the wedge-shaped portion and a passageway extending longitudinally within the main body and communicating with the slit. The slit is provided with a flapper comprising a thin sheet-like member formed to have a plurality of projections on a distal end thereof and oriented in such a manner that the projections are situated in the slit. Gaps are formed between the plurality of projections in the slit and serve as gas flow ports, and the slit is elastically deformed by a change in pressure received by the pressure-responsive surfaces, whereby the size of the air flow ports is varied and there is obtained an air flow velocity conforming to the change in pressure received by the pressure-responsive surfaces.
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