Method and apparatus for manufacture of cold setting foundry moulds and cores

Claim 1

Apparatus for preparing foundry moulds and cores from a cold quick setting sand, resin and catalyst mixture comprising a stationary mixing chamber having a pair of inlets for the delivery thereto of two separate charges, one charge being sand and resin and the other charge being sand and catalyst, said chamber further having an outlet and means for connecting said outlet directly to a moulding box for delivery of the mixture from the chamber to the mould box without additional operations on the mixture between said outlet and the mould box, supply means for delivering said separate charges of said sand and resin and said sand and catalyst to said chamber, controlled valve means between the supply means and the chamber for sealing the supply of said charges to the chamber from said supply means when metered quantities of said charges have been delivered, a rotatable mixing element in the chamber, drive means for continuously rotating the mixing element while the two charges are being introduced and while the mixture is being removed to form a substantially complete mixture from said charges as said charges are supplied to the chamber, a source of compressed gas, duct means connecting said source to the chamber and a controlled valve means in said duct means for admitting a blast of compressed gas from said source to said chamber when said metered quantities of said charges have been supplied to the chamber to shoot the mixture directly into a moulding box through said outlet without additional operations on the mixture between the said outlet and the moulded box.

Claim 11

A method of preparing foundry moulds and cores by a substantially cold curing process comprising the steps of: metering separately a first charge of sand and resin and a second charge of sand and catalyst, delivering the separate charges separately into a stationary mixing chamber, substantially completely mixing the two charges iN the mixing chamber with a continuously operating rotating mixing element, and when said metered charges have been supplied to the mixing chamber removing the mixture from the mixing chamber directly into a mould or core box without the interposition of additional operating steps on the mixture between the chamber and the mould box, by directing a blast of compressed gas, introduced through a passage separate from the charge inlet into the mixture in the chamber such that its energy is utilized primarily to move the mixture out of an outlet from the mixing chamber and directly into the mould or core box, the step of mixing the two charges with the mixing element continuing as the charges are introduced into and as the mixture is removed from the mixing chamber to effect said substantially complete mixing of the charges in the chamber.

Claim 12

A method of preparing foundry moulds and cores by a substantially cold curing process comprising the steps of: metering separately a first charge of sand and resin and a second charge of sand and catalyst, delivering the separate charges separately into a stationary mixing chamber, substantially completely mixing the two charges iN the mixing chamber with a continuously operating rotating mixing element, and when said metered charges have been supplied to the mixing chamber removing the mixture from the mixing chamber directly into a mould or core box without the interposition of additional operating steps on the mixture between the chamber and the mould box, by directing a blast of compressed gas, introduced through a passage separate from the charge inlet into the mixture in the chamber such that its energy is utilized primarily to move the mixture out of an outlet from the mixing chamber and directly into the mould or core box, the step of mixing the two charges with the mixing element continuing as the charges are introduced into and as the mixture is removed from the mixing chamber to effect said substantially complete mixing of the charges in the chamber.