Hand-held device for dispensing a multi-component substance

A hand-held device for the measured dispensing of a putty-like or paste-like multi-component substance where the components are held in at least two separate containers, comprising a housing member for holding the separate containers, a piston for each said container for displacement through said container for pressing out the contents of the container, a piston rod for each said piston, said piston rods mounted in said housing and being axially displaceable for pressing said pistons into the containers for dispensing the contents of the containers, means associated with each said piston rod for holding said piston rods against displacement in the direction opposite to the direction in which the contents of the containers are dispensed, means for displacing said piston rods and said pistons in the dispensing direction, said means for displacing said piston rods including a drive member engageable with said piston rods, a web member located within said housing adjacent said drive member on the opposite side of said drive member from said pistons, said web member having openings therethrough through which said piston rods extend, said means for holding said piston rods comprising a stop member for each said piston rod, each said stop member being pivotally supported adjacent one end by said web member, and a releasing member in contact with the opposite ends of said stop members from the ends pivotally engageable with said web member, a spring extending between said web member and said stop members for biasing said stop members into holding engagement with said piston rods, and said releasing member mounted on said housing and in contact with said stop members so that by displacing said releasing member against the biasing action of said stop members can be displaced out of holding engagement with said piston