Method of mixing chemically bonded foundry sand by vibratory action

A method for mixing foundry sand with two part chemical binders comprising the steps of locating the place of introduction of the first part of the binder in respect to a lengthwise extending mixing trough, locating the place of introduction of the second part of the binder in respect to the mixing trough, introducing the sand into one end of the mixing trough, vibrating the mixing trough causing the sand to turn over, the sand laterally moving in the mixing trough sequentially past the places of introduction of the first part and second part of the binder respectively, introducing the first part and second part of the binder into the mixing trough, said vibrating the mixing trough also mixing the sand and two part chemical binder, and discharging the sand and two part chemical binder mixture from the other end of the mixing trough.