Abstract: In a hot melt adhesive dispensing gun, an electronic circuit is constructed to enable the operator to set a desired temperature to which the glue is heated. This set point is automatically raised a predetermined amount when the glue is flowing in order to compensate for the drop in temperature caused by the loss of heat to the glue and atmosphere.

Abstract: A hot melt body for an applicator or dispenser of thermoplastic adhesive first received in solid form, either as a progressively fed rod or in another mode, is provided having especial advantage in a light-weight hand-type device. The main melt chamber and its auxiliary channels as well as their interconnecting passageways are of configuration and spacing to effect maximum efficiency in transfering melting heat from a heating means to the adhesive being liquefied. To this end, also, complemental portions of the body include passageways designed to provide minimum, substantially uniform resistance to advance of the solid adhesive along the length of the melt body.

Abstract: In a hot melt glue dispensing gun, apparatus is constructed to feed a flexible rod of glue to a heated melt chamber. This apparatus includes two motor driven gears which engage the glue rod and feed the glue to the melt chamber. This feed mechanism is mounted on a sliding frame which is spring biased to retract when the appliance is idling, thereby partially withdrawing the glue rod from the melt chamber.

Abstract: In a dispenser or applicator of heat softenable material, a melt body has a generally conical melting chamber extending between an inlet and a relatively smaller outlet passage, at least one by-pass interconnected to the melting chamber by a plurality of spaced, radial bores arranged to conduct hot melt from successive outer "layers" of the material as it is being progressively softened, reduced and liquefied in the chamber for flowing to the outlet, and at least one axial auxiliary channel extending between the outlet and the smaller end of the melting chamber for conducting the central core of the last-to-be melted end portion of the material. Preferably the body has a pair of by-passes, a pair of auxiliary channels, encloses a heater, and is of configuration facilitating its economical construction in one piece.