Patent ID: 6981621

Claim:
A caulking gun comprising: an elongated body having an open front end; a pair of chains situated within said elongated body in coiled fashion, said chains being fixedly interlocked one to another at a front end thereof, a coiled portion of said chains being reversibly interlockable one to another to form a push-rod when extended; a disk-shaped element attached to said front end of said push-rod; a self-contained driving mechanism for graduated extension of said coiled portion of said pair of chains in parallel interlocked fashion, forming said push-rod; and a release mechanism for restoring said pair of parallel chains to their fully retracted, coiled position, such that by repeated actuation of said driving mechanism, said coiled chains are brought into interlocking contact one with the other, increasing the length of said push-rod, thereby carrying said disk element forward against a caulk cartridge inserted within said elongated body, causing extrusion of material contained within said cartridge.