Foam injection head

Claim 1

A MIXING AND EJECTION HEAD FOR FOAMABLE REACTING RESIN MATERIALS COMPRISING: A HOUSING INCLUDING A MIXING CHAMBER; A SHAFT ROTATABLY MOUNTED IN BEARINGS IN SAID HOUSING; A ROTATABLE MIXER IN SAID CHAMBER AND ATTACHED TO SAID SHAFT TO BE ROTATED THEREWITH; INJECTION PASSAGES IN SAID HOUSING INTO SAID CHAMBER FOR MAJOR INGREDIENTS TO BE REACTED; UNPLUGGING MEANS IN SAID PASSAGES SHIFTABLE FROM A FIRST POSITION TO A SECOND POSITION TO PUSH INGREDIENTS THEREFROM INTO SAID CHAMBER; TINY PASSAGE AND PORT MEANS IN SAID HOUSING FOR INJECTING ADDITIONAL REAGENTS IN SMALL AMOUNTS INTO SAID CHAMBER; SAID PORT MEANS COMMUNICATING WITH AT LEAST ONE OF SAID INGREDIENT PASSAGES INTERMEDIATE ITS ENDS, SPACED FROM SAID CHAMBER; SAID PLUNGER MEANS IN SAID SECOND POSITION BEING BETWEEN SAID PORT MEANS AND SAID CHAMBER MEANS; A RECESS IN SAID HOUSING ADJACENT SAID CHAMBER AND AROUND A PORTION OF SAID SHAFT; SAID RECESS BEING BETWEEN SAID CHAMBER AND SAID BEARINGS; COLLAR MEANS IN SAID RECESS, FORMING A RESTRICTED ANNULAR PASSAGE MEANS ALONG SAID SHAFT INTO SAID CHAMBER; FURTHER PASSAGE MEANS IN SAID HOUSING FOR ENTRY OF A BLOWING AGENT; SAID PASSAGE TERMINATING IN SAID ANNULAR PASSAGE MEANS TO CAUSE BLOWING AGENT FLOW ALONG SAID SHAFT PORTION INTO SAID CHAMBER TO PREVENT REAGENT FLOW FROM SAID CHAMBER ALONG SAID SHAFT INTO SAID BEARINGS; A SECOND COLLAR ATTACHED TO SAID SHAFT ADJACENT SAID FIRST COLLAR TO