Patents by Inventor Harry Spielvogel

Harry Spielvogel 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).

  • Safety control device for protecting hydraulically supported loads against uncontrolled lowering and lifting
    Patent number: 4489643
    Abstract: A safety circuit for preventing uncontrolled descent of a hydraulically supported load, in the event of a leak, comprises parallel hydraulic pressure feed lines, control valves in these, and means responsive to a difference in pressure between the lines and arranged to close the valves when such a pressure difference is detected. The valves are provided adjacent to a lifting cylinder or cylinders and close to the pressure source, so as to prevent spillage of hydraulic fluid as well as to prevent descent of the supported load.
    Type: Grant
    Filed: January 21, 1981
    Date of Patent: December 25, 1984
    Assignee: SMS Schloemann-Siemag Aktiengesellschaft
    Inventors: Harry Spielvogel, Heinz Schedler
  • Safety control device for protecting hydraulically held loads against uncontrolled pressure overloading
    Patent number: 4433612
    Abstract: A hydraulic press has lowering and lifting cylinders, a controlled pressure-limiting valve connected to the high-pressure hydraulic supply, and a shuttle valve with its operating inlets connected respectively to the hydraulic supply and to the lifting cylinders and its outlet connected to the pressure-limiting valve to control it. Further valves responsive to a disturbance of hydraulic equilibrium in the hydraulic circuit operate switches controlling the hydraulic fluid supply.
    Type: Grant
    Filed: February 26, 1981
    Date of Patent: February 28, 1984
    Assignee: SMS Schloemann-Siemag Aktiengesellschaft
    Inventors: Harry Spielvogel, Heinz Schedler
  • Hydraulic valve
    Patent number: 4076210
    Abstract: A hydraulic valve has a valve member whose travel is limited at one end by an abutment. The abutment is part of a hydraulic piston-cylinder arrangement, and when the piston-cylinder arrangement is pressurized and the valve member is moved to the end of its travel, the abutment is held in a first position where the valve is only open to a small extent. If the piston-cylinder arrangement is then pressure-relieved, the force moving the valve member against the abutment displaces the abutment so that the valve can open further.
    Type: Grant
    Filed: February 27, 1975
    Date of Patent: February 28, 1978
    Assignee: Schloemann-Siemag Aktiengesellschaft
    Inventor: Harry Spielvogel