Abstract: A fitting tube structure of a glue gun contains: a conical connection part, an accommodation chamber, a feeding segment, and an open segment. The fitting assembly includes a first fixing tube, an O ring, a second fixing tube, a stop sleeve, a locating ring, and a coupling tube. The first fixing tube has a stepped portion. The O ring is retained between the stepped portion and the second fixing tube. The stop sleeve is fitted on the first fixing tube and has a large-diameter extension and a small-diameter extension, and the large-diameter extension covers the first fixing tube and is fitted on the large-diameter extension by using the locating ring. The coupling tube is fixed on the small-diameter extension. Furthermore, the first fixing tube, the second fixing tube, and the stop sleeve are fitted and are fixed by the locating ring and the coupling tube.

Abstract: A hot melt glue gun with an automatic glue stick feeding structure includes a gun-shaped housing, a press button, an automatic glue stick feeding device, a hot melt unit, a nozzle, and a control unit. The automatic glue stick feeding device includes a casing and a synchronous motor having a transmission shaft. The casing includes a transmission gear, an inlet, and at least one gear train having upper and lower gears and a passage. The control unit includes a control printed circuit board, a micro switch, a forward relay output control portion, and a rearward relay output control portion. A glue stick is moved forwards when a user slightly presses the press button. When the press button is not pressed, the glue stick moves rearwards, avoiding continuous dripping of the molten glue through a nozzle.

Abstract: A concealed adjustable temperature switch includes a fixed plate, an adjusting block threadedly engaged with a screw hole of the fixed plate, a bimetal plate, and a metal plate. Mounted on the adjusting block are upper and lower positioning rings and a fixing ring between the positioning rings. The fixed ring includes a hole through which the adjusting block extends. The fixing ring includes a stop projecting toward the fixed plate. The stop includes two sides having a height greater than a thickness of the fixed plate. A distance between the stop and a center of the hole of the fixing ring is greater than that between a front edge of the fixed plate and a center of the screw hole of the fixed plate and than that between either one of two sides of the fixed plate to the center of the screw hole of the fixed plate.

Abstract: A glue gun having a structure for pushing a glue stick inserted in a hollow passage in a pushing base, provided with a pushing block to be moved by movement of a trigger, an arm and a connecting plate to push forward the glue stick together with the pushing base.