Patents by Inventor Richard WIRT

Richard WIRT 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).

  • Patent number: 11952937
    Abstract: A two-stroke engine possesses a cylinder, in the cylinder bore of which a combustion chamber is formed. The combustion chamber is bounded by a reciprocating piston, which drives a crankshaft rotatably mounted in a crankcase. A crankcase interior is fluidically connected to the combustion chamber across at least one transfer channel in at least one position of the piston. The at least one transfer channel emerges with a discharge opening in the crankcase interior and with at least one transfer window on the cylinder bore. It is proposed that all transfer channels have an average length as measured from the discharge opening to the transfer window, the average length being at least 1.5 in relation to the stroke, and that the volume of the crankcase interior including all transfer channels is at most 3.1 in relation to the piston displacement.
    Type: Grant
    Filed: June 13, 2023
    Date of Patent: April 9, 2024
    Assignee: Andreas Stihl AG & Co. KG
    Inventors: Michael Grether, Robert Koehli, Richard Wirt, Bernd Engel
  • Patent number: 11858107
    Abstract: A hand-portable working apparatus has: a working device, at least one handle, and a transport eyelet. The handle is at least partially arranged behind the working device along a longitudinal axis of the working apparatus. At least the handle defines a handle opening, wherein the handle opening extends approximately along the longitudinal axis. The transport eyelet is arranged approximately at or before a front end of the handle opening along the longitudinal axis. At least the transport eyelet defines an eyelet opening, wherein, in an attaching and/or detaching position of the transport eyelet, an eyelet opening normal of the eyelet opening is oriented approximately along a vertical axis of the working apparatus.
    Type: Grant
    Filed: January 21, 2022
    Date of Patent: January 2, 2024
    Assignee: Andreas Stihl AG & Co. KG
    Inventor: Richard Wirt
  • Publication number: 20230399973
    Abstract: A two-stroke engine possesses a cylinder, in the cylinder bore of which a combustion chamber is formed. The combustion chamber is bounded by a reciprocating piston, which drives a crankshaft rotatably mounted in a crankcase. A crankcase interior is fluidically connected to the combustion chamber across at least one transfer channel in at least one position of the piston. The at least one transfer channel emerges with a discharge opening in the crankcase interior and with at least one transfer window on the cylinder bore. It is proposed that all transfer channels have an average length as measured from the discharge opening to the transfer window, the average length being at least 1.5 in relation to the stroke, and that the volume of the crankcase interior including all transfer channels is at most 3.1 in relation to the piston displacement.
    Type: Application
    Filed: June 13, 2023
    Publication date: December 14, 2023
    Inventors: Michael Grether, Robert Koehli, Richard Wirt, Bernd Engel
  • Publication number: 20220234188
    Abstract: A hand-portable working apparatus has: a working device, at least one handle, and a transport eyelet. The handle is at least partially arranged behind the working device along a longitudinal axis of the working apparatus. At least the handle defines a handle opening, wherein the handle opening extends approximately along the longitudinal axis. The transport eyelet is arranged approximately at or before a front end of the handle opening along the longitudinal axis. At least the transport eyelet defines an eyelet opening, wherein, in an attaching and/or detaching position of the transport eyelet, an eyelet opening normal of the eyelet opening is oriented approximately along a vertical axis of the working apparatus.
    Type: Application
    Filed: January 21, 2022
    Publication date: July 28, 2022
    Inventor: Richard WIRT