Patent ID: 7331773

Claim:
A pump, comprising: a pump case; a diaphragm, provided in the pump case to define a pump chamber; a pump output port extending from the pump chamber; a pump intake port extending into the pump chamber; a motor, arranged to actuate movement of the diaphragm, to draw air into the pump chamber through the pump intake port and to pump the drawn air through the pump output port and an output port pressure relief exhaust valve, to selectively rapidly exhaust air in the pump chamber to rapidly lower a pressure in the pump output port, the pressure relief exhaust valve comprising: a movable valve body, movable between a closed position and an open position to rapidly lower the air pressure in the pump output port; and an actuator, selectively driven by the motor to selectively actuate the valve body between the closed position and the open, wherein the motor has a rotary shaft, and wherein the actuator comprises: a first gear, coupled with the rotary shaft of the motor; a second gear, meshing with the first gear to be rotated; a lever member, pivotably provided about the rotary shaft; an urging member exerting an urging force urging said valve body toward said closed position; and a clutch mechanism, connecting the second gear and the lever member such that the lever member is pivoted in accordance with the rotation of the rotary shaft, wherein the second gear, lever member and clutch mechanism are constructed and arranged such that when the rotary shaft of the motor rotates in a first motor direction the lever member and second gear are pivoted in a first actuating direction to a position where the second gear abuts against and moves the valve body to the open position, and when the rotary shaft of the motor rotates in a second motor direction, opposite the first motor direction, the lever member and second gear are pivoted in a second actuating direction, opposite the first actuating direction, to a position where the second gear is separated from the valve body and the valve body is moved by the urging force to the closed position.