Low Pressure Shut Off for a Pneumatic Tool

摘要

A low pressure shut off for a pneumatic tool. The tool may include an air path for input air. A shaft may be positioned along the air path and movable relative to the air path between a first position and a second position. First and second pistons may be spaced axially apart along the shaft and each may extend radially outward beyond the shaft. In the first position, the first piston may extend across the air path to block the air path. In the second position, the second piston may be positioned to be acted on by air from a secondary inlet to apply a force to the second piston that overcomes a biasing force and positions the first piston to allow air to flow along the air path.

主权项

1. A low pressure shut off for a pneumatic tool comprising:
an air path comprising a main inlet, an outlet, and a secondary inlet; a shaft positioned along the air path between the main inlet and the outlet, the shaft being movable relative to the air path between a first position and a second position; first and second pistons spaced axially apart along the shaft and each extending radially outward beyond the shaft; and a biasing member acting on the shaft to bias the shaft towards the first position; in the first position, the first piston extends across the air path between the main inlet and the outlet to block the air path; in the first position, the second piston is positioned to be acted on by air from the secondary inlet to apply a force to the second piston that overcomes the force of the biasing member and position the shaft at the second position with the first piston away from the air path to allow air to flow along the air path between the main inlet and the outlet.