Patent ID: 9255571
Filing Date: 2016-02-09
CPC Classification: F04B,G01D

Claim Text:
1. An air pump, comprising an air pump body for pumping air, and a pressure gauge unit for measuring and indicating the air pumped by said air pump body, said pressure gauge unit comprising a high pressure gauge and a low pressure gauge mounted in said air pump body; wherein said pressure gauge unit further comprising a dial marked with graduated scale means for high pressure indication and low pressure indication, a high pressure measuring device installed in said high pressure gauge, a low pressure measuring device installed in said low pressure gauge, a high pressure indicator suspending above said dial and rotatable by said high pressure measuring device, and a low pressure indicator suspending above said dial and rotatable by said low pressure measuring device; wherein said high pressure measuring device and said low pressure measuring device each comprise a piston tube defining a longitudinal sliding slot at one side thereof, a piston movably accommodated in said piston tube, a spring having one end thereof stopped against said piston and an opposite end thereof stopped against a bottom wall of said piston tube, a toothed rack disposed outside said piston tube and fixedly connected to said piston and movable along said longitudinal sliding slot, and a gear meshed with said toothed rack; said high pressure indicator and said low pressure indicator are respectively fixedly connected to the gear of said high pressure measuring device and the gear of said low pressure measuring device.