Negative pressure-type booster device
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United States of America Patent
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Sep 18, 2018
Grant Date -
Feb 9, 2017
app pub date -
May 29, 2015
filing date -
May 30, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention addresses the problem of standardizing a front shell of a booster shell of a negative pressure-type booster device by modifying the shape of a reinforcement rib provided to the front shell so as to satisfy the demand for varying the installation pitch and installation angle of tie-rod holes with one and the same front shell. A front shell configuring a booster shell of a negative pressure-type booster device in combination with a rear shell includes a reinforcement rib formed by bending the shells, wherein the reinforcement rib is formed along a virtual ellipse of which the center is located at the center of the front shell, with the major axes of the ellipse disposed on a line connecting the centers of two tie-rod holes provided in the front shell.
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