Hollow core molding device for use in shell mold

Claim 2

A hollow core molding device for use in a shell mold, characterized in that said device comprises: a sand container having at least one sand injecting pipe; a movable suction member having at least one sand injecting pipe and a downwardly opened suction chamber, said movable suction member being movable between a first position for communicating said sand injecting pipes with a sand injecting nozzle connected to a core mold for injecting shell sand into a cavity within the core mold and a second position for communicating said downwardly opened suction chamber with an upwardly opened suction chamber in a fixed suction member, said upwardly opened suction chamber communicated with an external vacuum means, and said fixed suction member including said sand injecting nozzle; such that said shell sand is injected into the core mold when the sand injecting pipe provided in the sand container, the sand injecting pipe disposed in the movable suction member and the sand injecting nozzle disposed in the fixed suction member are in communication with each other, and unhardened shell sand is removed from said cavity by suction after molding a core when said movable suction member is shifted to thereby communicate the sand injecting pipe of the fixed suction member with said downwardly opened suction chamber of the movable suction member and the upwardly opened suction chamber of the fixed suction member.

Claim 3

A hollow core molding device for use in a shell mold, characterized in that a fixed suction member is provided in a sand container, said fixed suction member having a suction chamber communicated with an external vacuum means, and a sand injecting pipe having one closed end, a passage at an intermediate portion on one side of said pipe and a flanged portion at the other end of said pipe, said sand injecting pipe having a spring interposed between the flange and the fixed suction member and said sand injecting pipe movably extending through said fixed suction member into said sand container such that said passage is communicated with said sand container and wherein said spring acting against said flange moves said pipe away from said sand container such that said passage is communicated with said suction chamber.

Claim 4

A hollow core molding device for use in a shell mold, characterized in that a fixed suction member is provided in a sand container, said fixed suction member having a suction chamber communicated with an external vacuum means, and a sand injecting pipe having one closed end, a passage at an intermediate portion on one side of said pipe and a flanged portion at the other end of said pipe, said sand injecting pipe having a spring interposed between the flange and the fixed suction member and said sand injecting pipe movably extending through said fixed suction member into said sand container such that said passage is communicated with said sand container and wherein said spring acting against said flange moves said pipe away from said sand container such that said passage is communicated with said suction chamber.

Claim 5

A molding apparatus comprising: core mold means including at least one cavity for molding, container means for containing sand, said container means including at least one injection means for injecting sand into said cavity, wherein said injection means includes a pipe extending from the interior to the exterior of said container means, vacuum suction means for removing excess unhardened sand from said cavity after molding, and means for selectively communicating said cavity with one of said container means or said vacuum suction means through at least a portion of said injection means, such that said cavity is injected with sand by being in communication with said container means, and said cavity is discharged of said excess unhardened sand by being in communication with said vacuum suction means, wherein said selective communicating means includes a movable member interposed between said container means and said core mold means, and a fixed member interposed between said movable member and said core mold means, said movable member including an aperture extending therethrough and a downwardly opened chamber separated from said aperture, said fixed member including an aperture extending therethrough to an injection nozzle for coupling to said cavity and an upwardly opened chamber separated from said aperture, said upwardly opened chamber communicating with said vacuum suction means, said movable member being relatively movable with respect to said container means and said fixed member between a first position wherein said pipe, said apertures and said nozzle are aligned for injecting sand into said cavity and a second position wherein said nozzle, said aperture in said fixed member and said downwardly opened chamber in said movable member are in communication with said upwardly opened chamber in said fixed member for discharging said excess unhardened sand from said cavity.

Claim 6

A molding apparatus comprising: core mold means including at least one cavity for molding, container means for containing sand, said container means including at least one injection means for injecting sand into said cavity, wherein said injection means includes a pipe extending from the interior to the exterior of said container means, vacuum suction means for removing excess unhardened sand from said cavity after molding, and means for selectively communicating said cavity with one of said container means or said vacuum suction means through at least a portion of said injection means, such that said cavity is injected with sand by being in communication with said container means, and said cavity is discharged of said excess unhardened sand by being in communication with said vacuum suction means, wherein said selective communicating means includes a movable member interposed between said container means and said core mold means, and a fixed member interposed between said movable member and said core mold means, said movable member including an aperture extending therethrough and a downwardly opened chamber separated from said aperture, said fixed member including an aperture extending therethrough to an injection nozzle for coupling to said cavity and an upwardly opened chamber separated from said aperture, said upwardly opened chamber communicating with said vacuum suction means, said movable member being relatively movable with respect to said container means and said fixed member between a first position wherein said pipe, said apertures and said nozzle are aligned for injecting sand into said cavity and a second position wherein said nozzle, said aperture in said fixed member and said downwardly opened chamber in said movable member are in communication with said upwardly opened chamber in said fixed member for discharging said excess unhardened sand from said cavity.

Claim 7

A molding apparatus according to claim 3, wherein said vacuum suction means includes an external vacuum source communicating with said upwardly opened chamber of said fixed member.

Claim 8

A molding apparatus comprising: core mold means including at least one cavity for molding, container means for containing sand, said container means including at least one injection means for injecting sand into said cavity, vacuum suction means for removing excess unhardened sand from said cavity after molding, and means for selectively communicating said cavity with one of said container means or said vacuum suction means through at least a portion of said injection means, such that said cavity is injected with sand by being in communication with said container means, and said cavity is discharged of said excess unhardened sand by being in communication with said vacuum suction means, wherein said selective communicating means includes an extended tubular member including a closed end, an opened end, a flange about said opened end and an intermediate aperture in communication with said opened end between said closed and opened ends, said closed end being inserted in said container means and said opened end being arranged to be in communication with said cavity, said selective communicating means further including a spring member acting on said flange to maintain said intermediate aperture in communication with said vacuum suction means, and wherein said tubular member is arranged to be movable against the action of said spring upon coupling said opened end with said cavity such that said intermediate aperture is moved into said container means to communicate said container means and said cavity for injecting sand into said cavity through said tubular member, said tubular member being moved after molding to communicate said intermediate aperture with said vacuum suction means for discharging said excess unhardened sand.

Claim 9

A molding apparatus comprising: core mold means including at least one cavity for molding, container means for containing sand, said container means including at least one injection means for injecting sand into said cavity, vacuum suction means for removing excess unhardened sand from said cavity after molding, and means for selectively communicating said cavity with one of said container means or said vacuum suction means through at least a portion of said injection means, such that said cavity is injected with sand by being in communication with said container means, and said cavity is discharged of said excess unhardened sand by being in communication with said vacuum suction means, wherein said selective communicating means includes an extended tubular member including a closed end, an opened end, a flange about said opened end and an intermediate aperture in communication with said opened end between said closed and opened ends, said closed end being inserted in said container means and said opened end being arranged to be in communication with said cavity, said selective communicating means further including a spring member acting on said flange to maintain said intermediate aperture in communication with said vacuum suction means, and wherein said tubular member is arranged to be movable against the action of said spring upon coupling said opened end with said cavity such that said intermediate aperture is moved into said container means to communicate said container means and said cavity for injecting sand into said cavity through said tubular member, said tubular member being moved after molding to communicate said intermediate aperture with said vacuum suction means for discharging said excess unhardened sand.