Negative pressure type booster device
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United States of America Patent
Stats
-
Jan 8, 2019
Grant Date -
Sep 22, 2016
app pub date -
Oct 24, 2014
filing date -
Oct 25, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A movable diaphragm of a negative pressure type booster device includes an annular rubber diaphragm and an annular metal plate. The diaphragm is airtightly pinched by the housing at an annular outer peripheral bead portion formed at an outer peripheral edge of the diaphragm, and airtightly secured to an outer peripheral portion of a valve body, together with an inner peripheral portion of the plate, at an annular inner peripheral bead portion formed at an inner peripheral edge of the diaphragm. Between the outer peripheral bead portion and the inner peripheral bead portion, there are formed a folded portion having a curved portion toward the front and continuous with the outer peripheral bead portion at an outer peripheral area, and an annular portion continuous with an inner peripheral area of the folded portion and with the inner peripheral bead portion.
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