| 摘要 |
An air-operated tire chucking device consisting of a mandrel on which front and rear tire bead-engaging discs are slidably mounted. A removable stop key on the mandrel limits movement on the front disc. The rear disc has a cylinder which receives a stationary piston, defining an expansible primary chamber. With a tire between the discs, compressed air is admitted into this primary chamber, forcing the rear and front discs against the tire beads and thus forming a contact seal for inflation of the tire. As the rear disc reaches a predetermined position, a valve element carried thereby contacts the front disc and exposes a valve port in the rear disc, allowing air to exit from the primary chamber and fill the tire, the tire and discs now forming a secondary chamber. The tire continues to inflate until the air pressure in the tire forces the rear disc back and the valve element loses contact with the front disc and closes the inflation valve. The tire is released by venting the primary chamber, whereby the pressure in the tire overcomes the pressure in the primary chamber, forcing the rear disc rearwardly and causing a tire vent valve carried thereby to open, thus releasing the air from the tire.
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