Patent ID: 7156367

Claim:
A gas control knob, comprising: a main body having a gas inlet hole, a gas outlet hole and a mounting hole connected between the gas inlet hole and the gas outlet hole; a throttling cock rotatably mounted in the main body and located between the gas inlet hole and the gas outlet hole of the main body to regulate a gas flow rate between the gas inlet hole and the gas outlet hole of the main body; a rotation lever rotatably mounted in the mounting hole of the main body and having a first end secured to the throttling cock to rotate the throttling cock and a second end protruding outward from the main body; a fixing bracket mounted on the main body; a motor mounted on the fixing bracket to drive a transmission mechanism automatically which drives a clutch mechanism to drive and rotate the rotation lever to rotate the throttling cock so as to regulate the gas flow rate between the gas inlet hole and the gas outlet hole of the main body; wherein the motor is mounted on a bottom of the fixing bracket and has a drive worm protruding from the fixing bracket, and the transmission mechanism includes a shaft mounted on the fixing bracket, and a transmission worm rotatable mounted on the shaft and having an end provided with a transmission wormwheel meshing with and rotated by the drive worm of the motor; the clutch mechanism includes a fixing disk secured on the second end of the rotation lever to rotate the rotation lever, a driven wormwheel meshing with and rotated by the transmission worm and urged on the fixing disk to rotate the fixing disk; the clutch mechanism further includes a snap ring mounted on the second end of the rotation lever, and a spring mounted on the second end of the rotation lever and biased between the driven wormwheel and the snap ring to push the driven wormwheel toward the fixing disk so that the driven wormwheel is urged on the fixing disk closely.