WIND PRESSURE TYPE SHUTTER FOR OUTDOOR SWITCHBOARD
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United States of America Patent
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Issued Date -
Oct 3, 2024
app pub date -
Oct 22, 2021
filing date -
Oct 22, 2021
priority date (Note) -
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status (Latency Note)
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Abstract
A wind pressure type shutter includes first and second rotation shafts, and first and second flaps. The first flap rotatably hung on the first rotation shaft closes a flow path in a vertical position and opens the flow path in a position rotated from the vertical position. The second flap rotatably attached to the second rotation shaft closes the flow path and prevents the rotation of the first flap by an upstream-side end portion of the second flap in a horizontal position, and opens the flow path in a position rotated from the horizontal position. When a negative pressure is generated downstream of the second flap, the second flap rotates to open the flow path and the upstream-side end portion is disengaged from the first flap, so that the first flap rotates toward a downstream side to open the flow path.
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