Self-cleaning ejector-filter
AssigneeRegie Nationale des Usines Renault
InventorBernard Poisson
Life of this patent
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Abstract
A combination device permitting filtering of an air-sand mixture or an air-metal liquid mixture at the moment of filling a foundry mold, as well as ejection of the molded part, wherein a filtering element, composed of a spiral spring with spaces between its turns, is mounted and centered in the mold. This filtering element centers and guides an ejector, driven by an ejection striker plate. In the process of ejection, the elongation of the spring widens the spaces between its turns, thus freeing bits of sand or metal caught between the turns, to provide self-cleaning. The device can be used in foundries to make mold cores and to mold light-alloy parts by gravity or low pressure in metal molds.
Claims7
A combination device for filtering the air from an air-sand mixture or an air-liquid metal mixture in molds for sand cores and metal castings at the moment of filling these molds, as well as for ejecting the finished part, comprising:
- a filtering element in the form of a spiral spring, the turns of which are non-touching, for obstructing an air-evacuation orifice,
- an ejector element situated in said orifice such that the central part of the spiral spring is wrapped around an end of said ejector element so as to support said spiral spring and to oppose any sag in the spiral spring;
- and,
- means for moving said ejector element in an upward and downward direction.
A combination device for filtering the air from an air-sand mixture or an air-liquid metal mixture in molds for sand cores and metal castings at the moment of filling these molds, as well as for ejecting the finished part, comprising:
- a filtering element in the form of a spiral spring, the turns of which are non-touching, for obstructing an air-evacuation orifice;
- an ejector element situated in said orifice wherein said spiral spring has turns of a cross section forming a plane face flush with the surface of the mold on the side next to the part being molded, the cross section of the turns being of constantly decreasing width in the direction away from said surface.
Dependencies are inferred from the claim text.