| 摘要 |
A pouring spout for hand-held portable fuel tank incorporates a float valve to automatically shut off fuel flow through the spout when the fuel level in a receiving reservoir reaches a given spatial relationship with the outlet end of the spout. An axially displaceable locking magnet within the spout locks the valve in the closed position. The locking magnet is released from its locking position by an unlatching magnet incorporated in a sealing cap. The unlatching magnet cancels the magnetic force that holds the magnetic valve in the closed position, thereby allowing it to move to its open position only when the closure cap is in position to seal the spout. The locking mechanism includes an axially displaceable magnet of given axial length, that is captured within a sealed container positioned in the pouring spout. The sealed container has an axial length greater than the length of the magnet. The sealed container can be filled with a viscous fluid to slow axial displacement of the magnet as it moves from one axial end of the container to the other. The locking magnet is displaced to one end of the container when the spout is in the upright position, which the tank assumes when it is at rest, and moves to the opposite end of the container when the spout is in the inverted position that it assumes when the tank is tilted to fill a reservoir by pouring fluid out of the tank through the spout.
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