Patent ID: 7252486

Claim:
A hand-operated inflator comprising: a central block which has two longitudinal through holes extending from top to bottom surface to receive two screws inserted from the top and two pivot pins inserted from the bottom, one relief hole on one side to receive an over pressure valve, sealing one end of the transversal through hole that communicates with two longitudinal conduits inside the pivot pins, and a central outlet on back surface of the central block to attach a discharge tube with nozzle on the other end, another hole on the lower portion of the back side to rotatably receive a clamp plate, and a hole on the front surface to receive a pressure meter; and two pivot pins each of which has a longitudinal conduit running through the hollow core, a first circular band recess around the neck and a second circular band recess around the open end, wherein the first circular band recess is provided with a first hole on the bottom surface, and the second circular band recess with a second hole on the bottom surface, both of which communicate with each other through the longitudinal conduit inside the pivot pins, and each circular band recess is blocked by a pair of O-rings; wherein the pivot pins are respectively inserted through bottom holes of the cylinders, so that the position of the first circular band recess corresponds to the central hole of the cylindrical body, and the second circular band recess corresponds to the transversal through hole of the central block.