Feed piston pressure tube
AssigneeBlack & Decker Inc.
InventorsJonathan W. Fairbanks, Jonathan D. Kalow, James Sareault
Life of this patent
Estimating the term…
Abstract
A pneumatic fastening device which uses compressed air from an internal reservoir to momentarily move a feed piston in a direction away from a drive channel when a trigger is actuated and a fastener is driven into a workpiece. The compressed air can flow from the reservoir to a return chamber by flowing through a passageway to pressurize the return chamber and move the feed piston away from the drive channel. The passageway can be a feed piston pressure tube which received compressed air from the reservoir, passes through one or more bulkheads that separate different chambers of the pneumatic fastening device and has an outlet in the return chamber.
Claims27
A pneumatic fastening device, comprising:
- a trigger which when actuated changes a state of the pneumatic fastening device from a resting state to an actuated state:
- a driver piston configured at least in part within a driver cylinder;
- a driver blade driven by said driver piston to drive a fastener into a workpiece;
- a nosepiece having a drive channel;
- a feed piston return chamber housing a feed piston;
- a compressed air feed inlet through which a compressed air is fed to a pressure reservoir chamber which receives the compressed air;
- and
- a valve that selectively feeds the compressed air to the driver piston to drive the driver blade when the trigger is actuated to achieve the actuated state;
- wherein the feed piston return chamber is free of a feed of the compressed air when the pneumatic fastening device is in the resting state;
- wherein when the trigger is actuated the feed piston return chamber is selectively fed the compressed air which moves the feed piston in a direction away from the drive channel;
- and
- wherein, while the driver blade is driven by the compressed air, the feed piston return chamber is free of all air that has flowed through at least a portion of the driver cylinder.
A pneumatic fastening device, comprising:
- a compressed air feed inlet through which a compressed air is fed to a pressure reservoir chamber configured to contain the compressed air;
- a driver piston at least in part surrounded by a driver cylinder;
- a feed piston return chamber which houses a feed piston that drives a feed pawl that is free of any and all pivotal motion to control a feed of a plurality of nails;
- and
- a valve that selectively feeds the compressed air to the driver piston and to a feed piston pressure tube that provides the compressed air to the feed piston return chamber,
- wherein, while a driver blade is driven by the compressed air fed to the driver piston, the compressed air fed to the feed piston pressure tube is free of all air that has flowed through at least a portion of the driver cylinder.
Dependencies are inferred from the claim text.