Heat pump dispenser

A heat pump dispenser comprising:

• a housing having a handle portion and a barrel portion;
• a feeder section coupled to the handle portion, the feeder section includes a feeder mechanism and a dispensing trigger assembly operably coupled to the feeder mechanism, the feeder mechanism includes a gear assembly having a drive gear operably engaged to a plunger housed in the barrel portion, the trigger assembly includes a trigger having a ratchet portion, the ratchet portion selectively engages and rotates the drive gear to move the plunger toward a dispensing opening provided in the barrel portion and into engagement with an adhesive/filler stick, wherein the feeder mechanism is selectively actuated by the dispensing trigger assembly to advance the adhesive/filler stick into a heater section of the barrel portion,
• wherein the gear assembly further includes a rack drive gear and a linear gear provided as part of the plunger, the rack drive gear engaged to both the drive gear and the linear gear, and further including a biasing member that biases the drive gear towards the ratchet portion.