Head for mixing and discharging at least two ingredients

A head for mixing at least two ingredients supplied thereto from plural sources under pressure and for discharging the mixed product, comprising:

• a body having a main bore therethrough, having a mixing chamber, and having a separate transverse bore extending into said main bore corresponding with each ingredient;
• a slide member in the main bore and having ramp surfaces in the vicinity of said transverse bores, and means for moving the slide member axially in the main bore;
• distribution valve means corresponding with each ingredient coupled to a source and extending through the body, and each valve means having two valves controlling the flow of the ingredient in different branches of the valve including a discharge branch communicating with a discharge seat at a discharge orifice extending into said mixing chamber, and including a recirculation branch having a return flow seat and leading to a duct returning to the associated source, and each valve means having a stem reciprocable through said discharge and return flow seats and having needle valves facing the respective seats and operative to control the flow through the seats inversely, whereby the flow through one seat is restricted as the flow through the other seat is increased;
• and
• control means for each ingredient, each control means including rod means in each transverse bore contacting and being positioned by a ramp surface and having an outer end extending from the transverse bore by a distance determined by the axial position of the slide member, and including a lever for each rod means pivotally attached to the body of the head and having one leg tilted about the pivot in response to motion by the rod means and having another leg coupled to reciprocate a corresponding valve to displace the axis of pivoting of the actuating levers for one valve with respect to the other, which can be done simply by changing the point of application of push rods which are associated with a sliding member against which the rods rest.
• According to one modification, the pivoted lever which serves to actuate each valve is provided with an axially regulated abutment which cooperates with a pendulous arm moved by contact with the corresponding control rod. means.