| 摘要 |
A poppet valve having novel seal means for use in a pneumatic fastener apparatus of the kind having a cylinder, a piston slidably mounted for reciprocal movement in the cylinder, a fastener-driving hammer attached to the cylinder, and means including the poppet valve for controlling the application of pressurized air to the piston so as to cause it to execute a work stroke. The seal means comprises an O-ring disposed in a circumferentially-extending groove formed in the outer surface of the poppet valve member and arranged to make a sealing engagement with an end edge surface of the cylinder. More than half of the cross-sectional area of the O-ring is disposed within the groove so that as the poppet valve is driven into closing relation with the cylinder, the O-ring seal is clamped between an annular circumferentially-extending surface of the poppet valve member and the annular end edge surface of the cylinder, thereby providing a secure seal along the full perimeter of the cylinder.
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