B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
22/20
B22C 25/00 (2006.01) B22C 9/04 (2006.01) B22D 47/02 (2006.01)
Patent
CA 1320031
ABSTRACT OF THE DISCLOSURE A flask has obtuse-angled or arcuate portions at its inner periphery. It is provided in such a manner as to be movable by a moving device. A filling material such as sand is filled in this flask. Embedded in the filling material is a melting pattern which is decomposed while generating combustile gas when it is heated. A runner is connected to the melting pattern, and a hollow combustion suction is provided in such a manner that it is in contact with the layer of filling material. The combustion suction device has vent holes on its side wall which forms a gas collecting chamber, as well as a burner at its upper portion. The flask is vibrated by a vibrating device so as to pack the filling material densely and substantially uniformly by the action of the bent portions. Thereafter, a molten metal is poured from a sprue to manufacture a product, and the generated gas is ignited and burned at the burner of the combustion suction device by an ignition device provided in such a manner as to face the burner, by which suction of the gas is conducted. The flask is then moved so as to provide its burner with another ignition device and thereby maintain suction.
578910
Kanoh Kunihiko
Matsuki Kanji
Ohta Kazuhisa
Sunohara Tadaomi
Morikawa Sangyo Kabushiki Kaisha
Ridout & Maybee Llp
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