Pneumatic dispensers for viscous materials

Claim 1

A pneumatic dispenser for a multi-part pasty viscous material comprising a pneumatic cylinder containing a piston; spaced parallel piston rods mounted on said piston and extending from one end of said cylinder, parallel cylindrical containers mounted at said one end of said cylinder and extending away therefrom and containing the components of said material, one of said containers aligned with each of said rods, said rods each having a piston head moveable through one of said containers to forcibly express therefrom the contents of the containers, yoke means secured to said cylinder to hold the containers against the forces exerted by the rods, said dispenser having a single discharge nozzle supported against the pressure exerted by said rods, both said piston and said piston heads being concealed from the operator, an indicator rod mounted on said piston and extending therefrom parallel to said piston rods externally of said containers and moveable with and at the same rate as said piston rods, the ends of said indicator rod being so related to said piston heads that said end informs an operator of the position of said piston heads within said containers whereby the operator can observe the quantity of material remaining in said containers.