Patent ID: 7377756

Claim:
A pump, comprising: a pump case; a diaphragm, provided in the pump case so as to define a pump chamber communicated with an external member having an air chamber; a motor, which actuates the diaphragm to introduce air to the air chamber; and an exhaust valve, which exhausts air in the pump chamber to lower a pressure in the air chamber, the exhaust valve comprising: an exhaust port, communicated with the pump chamber; a flexible valve body, having a larger size than the exhaust port and disposed so as to close the exhaust port from a side facing the pump chamber; an actuator, disposed in an opposite side to the flexible valve body relative to the exhaust port, and driven by the motor so as to be movable between a first position retracted from the exhaust port and a second position passing through the exhaust port so that the flexible valve body is actuated so as to open the exhaust port; and an urging member, which always urges the actuator to the first position thereof.