| 摘要 |
A caulking gun includes a frame connected in the body of the device, a motor and a first gear respectively connected to the two sidewalls. A shaft extends through the two sidewalls with a sleeve and a board respectively and movably mounted to the shaft. A second gear connected to an end of the shaft so as to engage with the first gear. A collar having a toothed end is fixedly connected to the shaft and engagable with a toothed end of the sleeve. A rack is engaged with the toothed outside of the sleeve and contacts the rear end of a tube of caulking. The board is pushed by a spring toward the sleeve and has two recesses defined in one of two sides thereof. The trigger has two protrusions so that the board is pushed by the protrusion to disengage from the collar when the trigger is not pulled. When the trigger is pulled, the protrusions are received in the recesses and the sleeve is engaged with collar.
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