Patent ID: 8328052

Claim:
A dispensing gun comprising: a housing including a handle extended therefrom, and including a chamber formed therein, and including an aperture formed therein and communicative with the chamber of the housing, and including a cylindrical member having a compartment formed therein for engaging with and for holding a cartridge therein, a push rod slidably engaged through said aperture of said housing, and including a first end having a plunger provided thereon for engaging with a piston of the cartridge, an actuating plate including an orifice formed therein for receiving said push rod, a trigger pivotally secured to said housing and having an actuating pin for engaging with said actuating plate and for operating said actuating plate to move said push rod forwardly relative to said housing and for forcing a viscous material out of the cartridge, a first spring member engaged with said actuating plate for biasing said actuating plate to engage with said actuating pin of said trigger, a latch including a hole formed therein for receiving said push rod, a second spring member engaged with said latch for tilting said latch relative to said push rod and for actuating said latch to engage and to grasp said push rod and for preventing said push rod from moving rearwardly relative to said latch and said housing when said actuating plate is released by said trigger and for limiting a rearward movement of said push rod relative to said housing, and a release member slidably engaged in said housing and located between said latch and said actuating pin of said trigger for being selectively actuated and moved by said actuating pin of said trigger to engage with said latch and to erect said latch relative to said push rod and to selectively release said push rod from said latch.