Pressure moulding machines and mould parts therefor
OwnerNorbert R. Kelzinventor
Life of this patent
Estimating the term…
Abstract
In a pressure moulding machine, particularly a die casting machine, detection of locking together of the die parts by the applied pressure is effected by detecting the resulting mechanical stretch in the machine frame; the die parts are opened and closed together by an air motor associated with a hydraulic motor that damps the opening and closing movement of the dies, the die parts being locked together by the hydraulic motor; full closing of the die parts is determined by applying pressurized air to bores therein and to a controlling pressure switch, the pressure switch not being operable if air is leaking from the bores.
Claims10
In combination with a pressure moulding machine comprising a machine frame, means for mounting two mould parts by the frame for movement relative to one another for opening and closing the mould cavity formed by the two mould parts, motor means operatively connected to one mould part to move it relative to the other part and to hold the parts with their respective mating faces in mating engagement with one another under pressure during a mould filling operation, means for supplying air under a pressure different from ambient to one of the mould parts and for detecting movement of air from between the mould part mating faces caused by lack of mating engagement of the said faces;
- the combination comprising one of the mould parts having a bore therein for receiving the said air, the bore extending to a part of the said mating face of the mould part such that is opening to the respective mating face is spaced from the mould cavity.
In combination with a pressure moulding machine comprising a machine frame, means for mounting two mould parts by the frame for movement relative to one another for opening and closing the mould cavity formed by the two mould parts, motor means operatively connected to one mould part to move it relative to the other part and to hold the parts with their respective mating faces in mating engagement with one another under pressure during a mould filling operation, means for supplying air pressure higher than ambient to one of the mould parts and for detecting escape of air from between the mould part mating faces caused by lack of mating engagement of the said faces;
- the combination comprising one of the mould parts having a bore therein for receiving the said air, the bore extending to a part of the said mating face of the mould part such that its opening to the respective mating face is spaced from the mould cavity.
Dependencies are inferred from the claim text.