Hot melt cartridge adhesive gun - has trigger operated plunger to move adhesive into contact with heater and retractor operated by trigger release

摘要

A plunger is driven into engagement with the cartridge by a manually operative trigger actuated ratchet to urge the cartridge into contact with an electrical heater block and to provide pressure for driving the melting adhesive into a storage reservoir and out through a valved nozzle. A partially melted portion of the cartridge deforms under the applied pressure of the plunger to form a seal against backflow of molten adhesive. Upon release of the trigger, a retraction mechanism causes the plunger to retract a predetermined amount to disengage the cartridge thereby allowing closure of the nozzle valve and arresting of adhesive flow.