Patent ID: 7757904

Claim:
A caulking gun for dispensing a caulking material from a caulking tube containing the caulking material, the caulking gun comprising: a barrel for holding the caulking tube, the barrel having a forward end and a rearward end opposite the forward end, the barrel comprising a barrel lip at the rearward end of the barrel; a housing defining a housing lip, the housing and barrel lips being moveable relative to one another between a first position in which barrel and housing are separate and a second position in which the lips engage one another to releasably connect the barrel to the housing; a piston rod partially within the housing, the piston rod being slideable relative to the housing, the piston rod further being extendable into the barrel when the barrel is connected to the housing and withdrawable from the barrel, the piston rod locking the barrel into connection with the housing when the piston rod is extended into the barrel by limiting movement of the lips relative to one another, the piston rod being connected to a drive system for driving movement of the piston rod in the barrel.