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AssigneeGKN Windsor GmbH
InventorHerbert Strassheimer
Estimating the term…
An injection molding machine wherein the ram in the injection cylinder can be moved at several speeds and can be subjected to different fluid pressures by an apparatus having a two-way valve whose inlet is connectable to one or more pumps by way of discrete check valves and whose outlet is connected with a chamber of the injection cylinder by a conduit containing an electrically adjustable pressure relief valve. The valve member of the two-way valve is movable between a first position in which it completely seals the inlet from the outlet and several second positions in which it acts as a flow regulating means to permit the fluid to flow from the inlet to the outlet at a selected rate. The valve member is movable by a solenoid-operated pilot valve which cooperates with a stop extending into the path of movement of the valve member and being movable axially by a reversible motor which is controlled by the programming system of the injection molding machine. The programming system adjusts the pressure relief valve, moves the valve member of the pilot valve and selects the number of pumps which deliver fluid to the inlet of the two-way valve.
Apparatus for regulating the speed of and the fluid pressure acting upon the ram in the cylinder of an injection molding machine for thermoplastic material wherein the injection cylinder has a chamber for reception of pressurized fluid, comprising a two-way valve including a housing having a bore including a smaller diameter first portion, a larger diameter second portion, and a compartment between said portions, an inlet communicating with said first of said bore portions and an outlet communicating with said compartment, said valve including further a valve member movable in said housing between at least one first position in which said inlet is sealed from said outlet and a plurality of second positions in each of which said valve member allows said fluid to flow from said inlet to said outlet but at a different rate, said valve member including interconnected first and second sections respectively slidable in said first and second portions of said bore and respectively defining with said bore portions first and second chambers to opposite sides of said valve member, said housing further having a conical seat located in said compartment adjacent said first portion of said bore, said second section of said valve member which is slidable in said second portion of said bore having a conical sealing portion which engages said seat in said first position of said valve member and said sealing portion including a flow regulating device comprising a cylindrical element which is sealingly received in said first portion of said bore in said first position of said valve member, and a conical element rigid with said cylindrical element and defining with said seat a clearance whose size varies in response to movement of said valve member between said plurality of positions;
Dependencies are inferred from the claim text.