US 5,116,212 AGranted

System for injecting molten material into a molding apparatus

OwnerJean-Claude A. Clement-Demangeinventor

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Abstract

A system for injecting molten material into a receiving apparatus, such as a moulding apparatus. The system according to the invention utilizes at least a melting chamber and an injecting chamber which are incorporated in a same housing and which are connected through a canal for transferring molten material contained in the melting chamber to the injecting chamber. The system further utilizes an apparatus for controlling the feeding of the injecting chamber and the triggering of the injecting apparatus when the injecting chamber has a predetermined quantity of molten material to be injected.

Claims10

Dependent claims

An apparatus for injecting material into a cavity comprising:

a device for melting meltable material into a molten material and having a vertical melting chamber;
a device for injecting said molten material having a valve cylinder which is slidable in a fixed body and delimiting therein a vertical injection chamber, said injection chamber having an outlet port through which said molten material is forced from said injection chamber to said cavity;
means for vertically moving said slidable valve cylinder from a lower position to an upper position;
means for controlling the level of said molten material in said melting chamber and thereby controlling an amount of said molten material in said injection chamber and triggering an injection operation when said injection chamber is filled with a predetermined amount of said molten material to be injected;
means for forcing said molten material in said injection chamber into the cavity through said outlet port when said slidable valve member is in said upper position;
wherein said melting chamber and said injection chamber are vertically juxtaposed and communicate therebetween at their respective bottoms, when said slidable valve cylinder is in said lower position, through a transfer canal constituted by a first canal portion traversing a lateral wall of said fixed body and a second canal portion traversing a lateral wall of said slidable valve cylinder, said second canal portion located in the vicinity of the bottom of said injection chamber at a small distance thereabove and facing said first canal portion so that said molten material can flow from said melting chamber to said injection chamber until a predetermined level of said molten material in said injection chamber, controlled by said controlling and triggering means, is reached;
wherein said moving means moves said slidable valve cylinder upwardly to the upper position once said injection chamber is filled with said molten material so as to obstruct said second canal portion;
and
wherein said forcing means include a source of a fluid under pressure and means for feeding the fluid under pressure into said injection chamber when the slidable valve cylinder is in its upper position to force said molten material out of the injection chamber through said outlet port in order to inject said molten material upwardly into said cavity.

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Dependencies are inferred from the claim text.

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Abstract

An apparatus for injecting material into a cavity comprising:

a device for melting meltable material into a molten material and having a vertical melting chamber;
a device for injecting said molten material having a valve cylinder which is slidable in a fixed body and delimiting therein a vertical injection chamber, said injection chamber having an outlet port through which said molten material is forced from said injection chamber to said cavity;
means for vertically moving said slidable valve cylinder from a lower position to an upper position;
means for controlling the level of said molten material in said melting chamber and thereby controlling an amount of said molten material in said injection chamber and triggering an injection operation when said injection chamber is filled with a predetermined amount of said molten material to be injected;
means for forcing said molten material in said injection chamber into the cavity through said outlet port when said slidable valve member is in said upper position;
wherein said melting chamber and said injection chamber are vertically juxtaposed and communicate therebetween at their respective bottoms, when said slidable valve cylinder is in said lower position, through a transfer canal constituted by a first canal portion traversing a lateral wall of said fixed body and a second canal portion traversing a lateral wall of said slidable valve cylinder, said second canal portion located in the vicinity of the bottom of said injection chamber at a small distance thereabove and facing said first canal portion so that said molten material can flow from said melting chamber to said injection chamber until a predetermined level of said molten material in said injection chamber, controlled by said controlling and triggering means, is reached;
wherein said moving means moves said slidable valve cylinder upwardly to the upper position once said injection chamber is filled with said molten material so as to obstruct said second canal portion;
and
wherein said forcing means include a source of a fluid under pressure and means for feeding the fluid under pressure into said injection chamber when the slidable valve cylinder is in its upper position to force said molten material out of the injection chamber through said outlet port in order to inject said molten material upwardly into said cavity.

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