Patents by Inventor Norbert R. Kelz

Norbert R. Kelz has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Pressure moulding machines and mould parts therefor
    Patent number: 4063869
    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.
    Type: Grant
    Filed: December 3, 1975
    Date of Patent: December 20, 1977
    Inventor: Norbert R. Kelz
  • Pressure moulding machines and mould parts therefor
    Patent number: 4040776
    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.
    Type: Grant
    Filed: December 3, 1975
    Date of Patent: August 9, 1977
    Inventor: Norbert R. Kelz
  • Pressure moulding machines and mould parts therefor
    Patent number: 3942928
    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.
    Type: Grant
    Filed: August 21, 1973
    Date of Patent: March 9, 1976
    Inventor: Norbert R. Kelz