| 摘要 |
A pneumatically operated automatically cycling fastener driving tool includes a housing having a cavity defining a fluid reservoir. A cylinder is provided in the housing for slidably receiving a piston therein. A cylinder valve is provided for controlling the admission of fluid through and the exhaustion of fluid from the one end of the cylinder in response to the exhaustion of fluid from the cylinder valve and the admission of fluid thereto. A return fluid chamber provides for the return stroke of the piston and communicates with the cylinder. Suitable valve means are provided for supplying fluid to the return fluid chamber when the piston is near the end of its drive stroke. Control means are provided for cycling the fluid between the cylinder valve and the return fluid chamber to provide for repetitive cycling of the fastener driving tool.
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