Title: Adhesive gun

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Abstract: A thermoplastic material dispensing apparatus adapted to translate feedstock from a solid state to a molten state by a novel heater block structure, and to discharge the molten feedstock through a novel discharge valve in response to operation of a novel trigger device. A novel annular cooling chamber is established about the dispenser's barrel to maintain a solid/melt interface inside the barrel adjacent to the heater block structure, that zone being air cooled by inlet air taken from a single inlet air line. The inlet air from the single line also drives the dispenser's ram through use of a novel pneumatic motor/spool valve mechanism. The spool valve is manually stroked forward to extend the dispenser's ram for extruding the feedstock, and is manually stroked rearward to retract the ram for recharging. Other features include a novel visual telltale that disappears when recharging of the dispenser is desirable, and a novel safety interlock that prevents exposure of the charging port for recharging unless the dispenser's ram has been fully retracted and that insures retention of the ram in that fully retracted position while the charging port is so exposed.


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