| 摘要 |
An air pump pressure gauge includes a casing, an inner tube coaxially affixed to the casing and defining with the casing an accommodation chamber, a movable member movable back and forth in the accommodation chamber, an end cap end cap set between the inner tube and the casing to seal one end of the accommodation space, a spring member stopped between the end cap and the movable member, at least one seal member mounted on the movable member to define a first airtight structure between the outer surface of the inner tube and the at least one seal member and a second airtight structure between the inside wall of the casing and the at least one seal member, an air hole in communication between the axial hole of the inner tube and the accommodation space, a longitudinal sliding slot located on the movable member, a rack extending along one side of the longitudinal sliding slot, a rotating axle inserted through the longitudinal sliding slot and having its inner end pivoted to the inner tube and its outer end extending out of the casing and a middle part thereof mounted with a gear being meshed with the rack, a pointer fixedly connected to the outer end of the rotating axle outside the casing, a graduation scale mounted on the casing below the pointer, and a transparent cover covering the graduation scale and the pointer. |
