Dispenser for heat-liquefiable material with contiguous PTC heater and heat exchanging member

In a device for heating and dispensing heat-liquefiable material of the type adapted to receive solid heat-liquefiable material, and to dispense liquefied material from the outlet thereto, including means for incrementally feeding said solid heat-liquefiable material into said device, the improvement comprising:

• an efficient low volume thermal heat transfer mass heat exchanger structure comprised of a formed heat conductive material conductor juxtaposed to a resistive heating means on the outer wall surface(s) of said heat-liquefiable material conductor, the structure arranged to achieve direct thermal contact with said heat-liquefiable material fed into said device to liquefy and dispense the material when said heat exchanger structure is characterized by a ratio of mass to average power consumption during warm-up to the heat-liquefication temperature of less than the grams per watt defined by the calculation:
• ##EQU3## an operator control means comprised of a manually triggered, normally open, momentary on/off switch connected in a circuit to intermittently energize said heating element disposed in contiguous relationship to said heat exchanger structure and arranged to simultaneously apply pressure to means for incrementally feeding said heat-liquefiable material,
• whereby switch closure causes said heat exchanger structure to promptly melt and dispense said heat-liquefiable material and switch opening allowing re-solidification of said material.