Device for dispensing measured amounts of multi-component materials

A manually operable device for dispensing measured amounts of mastic-like or paste-like multi-component material held in two separate axially extending containers, comprising a housing for supporting the containers, an axially displaceable ejection piston is associated with each container and is displaceable into the container for forcing the material out of the container, a piston rod associated with each said piston and extending in the axial direction, each said piston rod having a first end and a second end, a pressing member positioned on the first end of each said piston rod and disposed in contact with said ejection piston associated with said piston rod for displacing said piston through the container and forcing the material out of the container, drive means within said housing for moving each of said piston rods in the axial direction for dispensing material out of the containers, a manually operable lever mounted on said housing for operating said drive means, wherein the improvement comprises that said drive means is movable in the dispensing direction and in the opposite direction, said drive means includes means for engaging and moving said piston rods for axially displacing said piston rods in the dispensing direction when material is to be dispensed out of the containers, and said drive means is releasably engageable with said piston rods so that when said drive means moves in the opposite direction it is released from said piston rods.