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US 4,231,415 AGranted
Apparatus for the production of foundry sand molds
AssigneeGeorg Fischer Aktiengesellschaft
InventorMax Wernli
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AssigneeGeorg Fischer Aktiengesellschaft
InventorMax Wernli
Estimating the term…
A dosed amount of molding sand is placed in a vessel arranged at a given distance from a pattern device from which a mold is to be formed, and a pressurized force is applied against the molding sand in the vessel from the side thereof remote from the pattern device in order thereby to impart to the molding sand an acceleration in the direction of the pattern device to compress the sand about the pattern device with the velocity of the accelerated molding sand being braked by impact with the pattern device and also by impact partially with a molding box within which the pattern device is contained. The vessel containing the molding sand is connected to a pressure source by a valve device which controls the application of pressure to the molding sand. Additionally a vacuum device is utilized to apply suction tending to compact the sand within the vessel to produce a more cohesive mass. After the vessel and the pattern device are moved into operative position, and the suction has been terminated, the valve may be opened to apply a pressurized force propelling the sand from the vessel against the pattern device.
Apparatus for producing foundry molds comprising vessel means for receiving therein a dosed amount of mold forming material, vacuum means for applying to said vessel means a suction effect to render mold forming material contained within said vessel means into a more cohesive mass, pressure means located adjacent said vessel means for applying a pressurized force to said mold forming material to propel said material out of said vessel means, valve means operatively interposed between said pressure means and said vessel means to control application of said pressurized force to said mold forming material, and pattern means including molding box means for receiving said mold forming material from said vessel means to form a mold therefrom, said valve means operating to block fluid flow between said pressure means and said vessel means while said vacuum means is applying suction to mold forming material contained within said vessel means, said valve means operating to open to permit fluid flow from said pressure means into said vessel means after said vacuum means have ceased applying suction within said vessel means and after said vessel means and said molding box means have been placed in operative relationship to enable transference of said mold forming material from said vessel means into said molding box means, with opening of said valve means operating to cause said pressure means to apply a pressurized force to said mold forming material to propel said mold forming material against said pattern means and to compress said mold forming material about said pattern means in order to form said foundry molds therefrom.
Apparatus for producing foundry molds comprising a vessel for receiving therein mold forming material, said vessel including an open side, a pressure tank adjoining said vessel on the side thereof opposite said open side, a silo for depositing mold forming material into said vessel, said silo including an outlet opening adapted to be placed in operative relationship with the open side of said vessel in order to enable said mold forming material to be delivered into said vessel from said silo when said silo and said vessel are moved into appropriate relative positions adjoining each other, valve means for selectively placing said pressure tank and said vessel in fluid flow communication with each other, molding box means including a pattern device adapted to be operatively joined with said vessel to form a generally enclosed chamber therebetween and pressure means for applying a pressurized fluid within said pressure tank, said valve means operating to open flow communication between said vessel and said pressure tank to admit said pressurized fluid into said vessel when said molding box means and said vessel are operatively joined in order thereby to accelerate said mold forming material through said enclosed chamber by application of said pressurized fluid thereto and to cause said mold forming material to strike said pattern device and to be compressed about said pattern device within said molding box means.
Apparatus for producing foundry molds comprising a vessel for receiving therein mold forming material, said vessel including an open side, a pressure tank adjoining said vessel on the side thereof opposite said open side, valve means for selectively placing said pressure tank and said vessel in fluid flow communication with each other, molding box means including a pattern device adapted to be operatively joined with said vessel to form a generally enclosed chamber therebetween, pressure means for applying a pressurized fluid within said pressure tank, said valve means operating to open flow communication between said vessel and said pressure tank to admit said pressurized fluid into said vessel when said molding box means and said vessel are operatively joined in order thereby to accelerate said mold forming material through said enclosed chamber by application of said pressurized fluid thereto and to cause said mold forming material to strike said pattern device and to be compressed about said pattern device within said molding box means, an intermediate plate extending between said pressure tank and said vessel, said intermediate plate having said valve means formed therethrough, said vessel, said pressure tank and said intermediate plate being assembled as a unit, with said unit being formed with an axis of symmetry extending through said vessel, said intermediate plate and said pressure tank, and means enabling said unit to be swiveled about an axis extending perpendicularly to said common axis of symmetry of said unit.
Apparatus for producing foundry molds comprising a vessel for receiving therein mold forming material, said vessel including an open side, a pressure tank adjoining said vessel on the side thereof opposite said open side, valve means for selectively placing said pressure tank and said vessel in fluid flow communication with each other, molding box means including a pattern device adapted to be operatively joined with said vessel to form a generally enclosed chamber therebetween and pressure means for applying a pressurized fluid within said pressure tank, said valve means operating to open flow communication between said vessel and said pressure tank to admit said pressurized fluid into said vessel when said molding box means and said vessel are operatively joined in order thereby to accelerate said mold forming material through said enclosed chamber by application of said pressurized fluid thereto and to cause said mold forming material to strike said pattern device and to be compressed about said pattern device within said molding box means, the chamber formed between said molding box means and said vessel being connected to a vacuum unit forming material through said enclosed chamber by application of said pressurized fluid thereto and to cause said mold forming material to strike said pattern device and to be compressed about said pattern device within said molding box means.
Apparatus for producing foundry molds comprising a vessel for receiving therein mold forming material, said vessel including an open side, vacuum means for applying suction to said vessel in order to compact and render into a more cohesive state mold forming material contained therein, a pressure tank adjoining said vessel on the side thereof opposite said open side, valve means for selectively placing said pressure tank and said vessel in fluid flow communication with each other, molding box means including a pattern device adapted to be operatively joined with said vessel to form a generally enclosed chamber therebetween and pressure means for applying a pressurized fluid within said pressure tank, said valve means operating to open flow communication between said vessel and said pressure tank to admit said pressurized fluid into said vessel when said molding box means and said vessel are operatively joined in order thereby to accelerate said mold forming material through said enclosed chamber by application of said pressurized fluid thereto and to cause said mold forming material to strike said pattern device and to be compressed about said pattern device within said molding box means.
Dependencies are inferred from the claim text.