Patent ID: 8294054

Claim:
A draining device for air control equipment comprising: a bottom shell having a draining hole formed through a bottom surface of the bottom shell; a top shell covered on a top of the bottom shell and having a sleeve part being hollow and communicating with the draining hole of the bottom shell; and two inclined recesses formed in an inside wall of the sleeve part; a knob mounted in the sleeve part and having a central hole communicating with the draining hole of the bottom shell; two sliding protrusions formed on and protruding transversely from an outside wall of the knob, and each sliding protrusion mounted slidably in one inclined recess of the top shell; and two tabs formed on a top surface of the knob, and each tab having an inner inclined side, and the inclined sides of the tabs facing to each other, wherein a bottom distance between bottom edges of the inner inclined sides of the tabs is smaller than a top distance between top edges of the inner inclined sides of the tabs; a switch mounted in the bottom shell and having a button; and a connecting device having a connecting tube mounted through the central hole of the knob and communicating with the draining hole of the bottom shell; a flange formed around the connecting tube and mounted across the inner inclined sides of the tabs of the knob; and an extension rod formed on and protruding out from the flange and having an end protrusion mounted through the top shell and the bottom shell and abutting the button of the switch.