Patent ID: 8770222

Claim:
An air pump assembly for a power chuck, capable of being mounted on a spindle head of a tooling machine, and comprising: a frame capable of moving linearly; and two air jet devices arranged independently and securely mounted on the frame, each air jet devices having: a nozzle securely mounted on the frame and having: a main body having: an outer tube having: a first opening; a second opening opposite to the first opening of the outer tube; and an inner surface; an inner tube having: a first end located within the inner surface of the outer tube of the outer tube; a second end opposite to the first end of the inner tube and protruding out from the second opening of the outer tube; and an inner surface; a pillar having: a first end; and a second end opposite to the first end of the pillar, inserted into the first opening of the outer tube and screwed with the inner surface of the outer tube; and a nozzle passage axially formed through the main body; a pin having: a base portion screwed with the inner surface of the inner tube; a needle portion axially connected with the base portion and protruding out from the second end of the inner tube, wherein an outer diameter of the needle portion is smaller than an inner diameter of the inner tube; and a vent formed through the base portion and parallel to an axis of the base portion; a pin spring compressibly mounted in the nozzle passage and abutting the base portion and the pillar; and a resilient cap mounted around the second end of the inner tube and having a distal end; and a valve facing and aligning with the needle portion of the nozzle and having: a chunk having: a side; a cap receiving section formed on the side of the chunk, facing the needle portion and having a shape fitting with that of the distal end of the cap; and a valve hole axially formed through the chunk; a ball mounted in the valve hole and partially protruding from the cap receiving section; and a ball spring compressibly and axially mounted in the valve hole and providing a force that enables the ball to press the chunk.