Inflator with upper cover showing pressure value

An inflator with an upper cover showing a pressure value, comprising:

• a body with an air chamber, one end of the air chamber being an open end;
• an air outlet channel communicated with the air chamber;
• a push rod having a pushing part and a rod body;
• the pushing part being disposed in the air chamber and capable of being actuated by the rod body to compress the air chamber;
• a driving unit provided with a driving part, the driving unit being communicated with the air outlet channel to enable the driving part to operate by pressure changes of the air outlet channel;
• an upper cover covered on the open end of the air chamber of the body, the upper cover being provided with a through hole;
• the rod body of the push rod is inserted in and is moveable in the through hole;
• and
• a pressure display unit disposed in the upper cover, the pressure display unit having a linkage part and a display part;
• the linkage part being linked with the driving part and the linkage part being able to move around the through hole, and the display part being driven by the linkage part to produce a rotational position change around the through hole as an axis, the linkage part and the display part are positioned outside of the through hole.