Patents by Inventor Kai FRIEWALD

Kai FRIEWALD 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: 11986939
    Abstract: A setting tool for driving fastening elements into a substrate comprises a holder for holding a fastening element; a drive-in element for transferring a fastening element held in the holder into the substrate along a setting axis; and, a drive for driving the drive-in element toward the fastening element along the setting axis, wherein the drive comprises an electrical capacitor; a squirrel-cage rotor arranged on the drive-in element; and, an excitation coil, which during rapid discharge of the capacitor is flowed through by current and generates a magnetic field that accelerates the drive-in element toward the fastening element, and wherein the setting tool has a control unit, which is suitable for carrying out a fuse discharge of the capacitor during which current does not flow through the excitation coil.
    Type: Grant
    Filed: May 29, 2019
    Date of Patent: May 21, 2024
    Assignee: HILTI AKTIENGESELLSCHAFT
    Inventors: Tilo Dittrich, Norbert Heeb, Kai Friewald
  • Publication number: 20210229251
    Abstract: A setting tool for driving fastening elements into a substrate comprises a holder for holding a fastening element; a drive-in element for transferring a fastening element held in the holder into the substrate along a setting axis; and, a drive for driving the drive-in element toward the fastening element along the setting axis, wherein the drive comprises an electrical capacitor; a squirrel-cage rotor arranged on the drive-in element; and, an excitation coil, which during rapid discharge of the capacitor is flowed through by current and generates a magnetic field that accelerates the drive-in element toward the fastening element, and wherein the setting tool has a control unit, which is suitable for carrying out a fuse discharge of the capacitor during which current does not flow through the excitation coil.
    Type: Application
    Filed: May 29, 2019
    Publication date: July 29, 2021
    Applicant: Hilti Aktiengesellschaft
    Inventors: Tilo DITTRICH, Norbert HEEB, Kai FRIEWALD
  • Publication number: 20210187715
    Abstract: A setting tool for driving fastening elements into a substrate is provided, the tool comprising a holder, which is provided for holding a fastening element, a drive-in element, which is provided for transferring a fastening element held in the holder into the substrate along a setting axis, a drive, which is provided for driving the drive-in element toward the fastening element along the setting axis, wherein the drive comprises an electrical capacitor, which has two electrodes, which are each arranged on a carrier film wound around a winding axis, wherein an extent of the capacitor in the direction of the winding axis is at most as great as an extent of the capacitor perpendicularly to the winding axis.
    Type: Application
    Filed: May 29, 2019
    Publication date: June 24, 2021
    Inventors: Tilo DITTRICH, Chafic ABU ANTOUN, Kai FRIEWALD