Patent ID: 6027316
Filing Date: 2000-02-22
Classification: F04B,Y10T

Abstract:
An air pump comprising:a head provided with a receiving cell and an air nozzle joint located in said receiving cell;a first air chamber in communication with said receiving cell;a second air chamber in communication with said receiving cell;a valve chamber including at one end thereof a pressure hole communicating with the receiving cell;a displacement member slidably located in said valve chamber, said displacement member including an air guiding portion;an elastic element urging said displacement member toward said pressure hole;a branch duct communicating between said first air chamber and said valve chamber; andan air releasing hole communicating between said valve chamber and atmosphere;wherein said air guiding portion is adapted to communicate between the branch duct and the air releasing hole;whereby pressure in the receiving cell controls a position of the displacement member and selectively couples the first air chamber with the atmosphere.