Patents by Inventor J{umlaut over (u)}rgen H{umlaut over (a)}berlein

J{umlaut over (u)}rgen H{umlaut over (a)}berlein 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).

  • Portable handheld work apparatus having a four-stroke engine
    Patent number: 6167874
    Abstract: The invention relates to a motor-driven chain saw having an internal combustion engine for driving the saw chain of the chain saw. The engine is mounted in the housing of the chain saw and includes a cylinder and a combustion chamber formed in the cylinder. The combustion chamber is delimited by a piston and the piston drives a crankshaft via a connecting rod. The crankshaft is rotatably journalled in a crankcase. An inlet and an outlet are provided for gas exchange in the combustion chamber and the inlet is connected via an intake channel to a mixture preparation device. A stroke/bore ratio of less than 0.8 is used in order to provide an engine of reduced structural elevation which is useable in all positions. The inlet and outlet are controlled via valves having a valve drive charged with the air/fuel lubricating oil mixture supplied via the mixture preparation device.
    Type: Grant
    Filed: December 7, 1999
    Date of Patent: January 2, 2001
    Assignee: Andreas Stihl AG & Co.
    Inventors: Georg Becker, J{umlaut over (u)}rgen H{umlaut over (a)}berlein