Forming apparatus having catalyst introduction simultaneous with sand injection

Apparatus for forming a part from chemically curable, particulate material such as treated sand, including a source (12, 72, 122) of said particulate material, a source (36, 102, 136) of a curing additive for curing said particulate material, a form (21, 100, 132) having a forming cavity (22, 110, 146) therein for forming said part and an inlet (19, 103, 140) through which the particulate material can be introduced from the source (12, 72, 122) of particulate material into the forming cavity (22, 110, 146) and an injector (11, 71, 112) connected with said source (12, 72, 122) of particulate material for simultaneously introducing said particulate material and said curing additive into said forming cavity (22, 110, 146), said injector (11, 71, 112) comprising a conduit (20, 104, 142) having a discharge end insertable into said inlet (19, 103, 140) for directing particulate material from said source (12, 72, 122) through said discharge end portion into said cavity (22, 110, 146), characterized by a passage (40, 103, 144) concentrically surrounding said conduit (20, 104, 142) and being connected with said source (36, 102, 136) of curing additive said passage (40, 103, 144) terminating at the discharge end of said conduit and discharging said additive into a region (61, 109, 145) at the discharging end of said conduit (20, 104, 142) whereby causing intermixing of said particulate material and additive in said region (61, 109, 145) as said particulate material is introduced into said cavity (22, 110, 146).