A dispensing gun for viscous materials comprises a stock supporting a push rod which is advanceable along a keep in which is mounted a cartridge of the material. The rod is advanced by means of a catch plate and trigger arrangement which bites on the rod and is retreated by a return spring. A release...http://www.google.es/patents/US5156305?utm_source=gb-gplus-sharePatente US5156305 - Dispensing gun
