Coating apparatus including masking means

Claim 1

APPARATUS FOR APPLYING COAGULANT IN VARYING DEGREES OF THICKNESS TO LIMITED SURFACE AREAS OF A FORM COMPRISING A GENERALLY TUBULAR HOUSING, A MASK MOUNTED ACROSS ONE END OF SAID HOUSING, SAID MASK HAVING AN OPENING FORMED THERETHROUGH, FIRST SHIELD MEANS POSITIONED ADJACENT THE INNER FACE OF THE MASK FOR SCREENING MARGINS OF THE OPENING IN SAID MASK, SECOND SHIELD MEANS POSITIONED ADJACENT THE OPENING IN SAID MASK FOR SELECTIVE MOVEMENT INTO AND OUT OF THE OPENING TO SHIELD A LIMITED AREA OF THE FORM EXPOSED THROUGH SAID OPENING, A GASKET MOUNTED ON THE OUTER FACE OF SAID MASK AND SURROUNDING THE OPENING THEREIN, SAID GASKET HAVING AN OUTWARDLY EXTENDING RIB SPACED FROM THE EDGES THEREOF FOR SPACING THE MASK A PREDETERMINED DISTANCE FROM THE FORM AND FOR FORMING A SEAL AROUND THE AREA OF THE FORM TO BE SPRAYED, AND MEANS POSITIONED ADJACENT THE OTHER END OF SAID HOUSING FOR SPRAYING A COAGULANT THROUGH THE OPENING IN SAID MASK ONTO THE FORM.