PNEUMATIC DEVICE
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United States of America Patent
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Issued Date -
Mar 2, 2017
app pub date -
Aug 23, 2016
filing date -
Aug 25, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A pneumatic device includes a cylinder, a piston rod and a valve unit. The cylinder includes an air chamber in which the piston rod is mounted, and a plurality of first backward flow paths. The valve unit is connected to the cylinder, and includes a valve seat assembly, and a valve member. The valve seat assembly includes an intake passage, a plurality of forward flow paths and a plurality of second backward flow paths. The valve member is movable between a first position where fluid communication between the intake passage and each of the second backward flow paths is prevented, and a second position where fluid communication between each of the forward flow paths and the communicating hole is prevented.
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