Patent ID: 7014070

Claim:
A C-gun type caulk gun to be used with multiple diameter disposable caulk tubes having a cylindrical body, a recessed front end from which a spout protrudes, and a movable plunger, the caulk gun comprising: a cradle having semi-circular cylindrical shape sized to receive any single disposable caulk tubes with a body length of 20.3 to 21.6 cm (8.0 to 8.5) inches and a range of outside diameters between 4.4 and 6.7 cm (1.75 and 2.63 inches); a rear end plate attached to the cradle and to a stock, the stock holding a push rod with a thrust disk attached to an end, the attached thrust disk sized to fit within a plunger of a caulk tube with an outer diameter in the range of 4.4 to less than 6.7 cm (1.75 to less than 2.63 inches); an actuating mechanism for the push rod; a circular front end plate having a diameter capable for receiving a caulk tube with a diameter in the range of 4.4 to 6.7 cm. (1.75 to 2.63 inches), having a slot for receiving the spout of the disposable caulk tube the front end plate attached to the cradle and the slot sized so that the spout is nominally aligned with the push rod; and a second thrust disk capable of sliding along the length of the push rod and a mechanical means for the locking the sliding thrust disk in place next to the attached thrust disk, the sliding thrust disk having a larger diameter than the attached thrust disk and the sliding thrust disk fitting within the plunger of a caulk tube with a diameter of 6.0 to 6.7 cm (2.38 to 2.63 inches).