Patents by Inventor David Dufke

David Dufke 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).

  • Hand-held electrically powered cut-off tool with a kickback mitigation function
    Patent number: 12629866
    Abstract: A hand-held electrically powered cut-off tool (100) for cutting concrete and stone by a rotatable cutting disc (105), the cut-off tool (100) comprising an electric motor (130) arranged to be controlled by a control unit (110) via a motor control interface (120), wherein the control unit (110) is arranged to obtain data indicative of an angular velocity of the cutting disc (105), and to detect a kickback condition based on a decrease in angular velocity, wherein the control unit (110) is arranged to determine an angular acceleration associated with the electric motor (130), and to detect the kickback condition based on a comparison between the determined angular acceleration and a detection threshold, wherein the detection threshold is configured at an angular acceleration between 5000 rad/s2 and 35000 rad/s2, and preferably between 10000 rad/s2 and 30000 rad/s2, and more preferably between 20000 rad/s2 and 30000 rad/s2.
    Type: Grant
    Filed: September 20, 2021
    Date of Patent: May 19, 2026
    Assignee: HUSQVARNA AB
    Inventors: Magnus Rosén, Victor Johansson, David Dufke, Johan Berg
  • Hand-held electrically powered cut-off tool with a kickback mitigation function
    Patent number: 12558814
    Abstract: A hand-held electrically powered cut-off tool (100) for cutting concrete and stone by a rotatable cutting disc (105), the cut-off tool (100) comprising an electric motor (130) arranged to be controlled by a control unit (110) via a motor control interface (120), wherein the control unit (110) is arranged to obtain data indicative of an angular velocity of the cutting disc (105), and to detect a kickback condition based on a decrease in angular velocity, wherein the control unit (110) is arranged to control an electromagnetic braking of the electric motor (130) in response to detecting a kickback condition, wherein the control unit (110) is arranged to determine an angular acceleration associated with the electric motor (130), and to detect the kickback condition based on a comparison between the determined angular acceleration and a configurable detection threshold.
    Type: Grant
    Filed: September 20, 2021
    Date of Patent: February 24, 2026
    Assignee: HUSQVARNA AB
    Inventors: Magnus Rosén, Victor Johansson, David Dufke, Johan Berg
  • Hand-held electrically powered cut-off tool with a kickback mitigation function
    Patent number: 12103201
    Abstract: A hand-held electrically powered cut-off tool (100) for cutting concrete and stone by a rotatable cutting disc (105), the cut-off tool (100) comprising an electric motor (130) arranged to be controlled by a control unit (110) via a motor control interface (120), wherein the control unit (110) is arranged to obtain data indicative of an angular velocity of the cutting disc (105), and to detect a kickback condition based on a decrease in angular velocity, and wherein the control unit (110) is arranged to electromagnetically brake the electric motor (130) in response to detecting a kickback condition.
    Type: Grant
    Filed: September 13, 2021
    Date of Patent: October 1, 2024
    Assignee: HUSQVARNA AB
    Inventors: Magnus Rosén, Victor Johansson, David Dufke, Johan Berg
  • A HAND-HELD ELECTRICALLY POWERED CUT-OFF TOOL WITH A KICKBACK MITIGATION FUNCTION
    Publication number: 20230405875
    Abstract: A hand-held electrically powered cut-off tool (100) for cutting concrete and stone by a rotatable cutting disc (105), the cut-off tool (100) comprising an electric motor (130) arranged to be controlled by a control unit (110) via a motor control interface (120), wherein the control unit (110) is arranged to obtain data indicative of an angular velocity of the cutting disc (105), and to detect a kickback condition based on a decrease in angular velocity, wherein the control unit (110) is arranged to control an electromagnetic braking of the electric motor (130) in response to detecting a kickback condition, wherein the control unit (110) is arranged to determine an angular acceleration associated with the electric motor (130), and to detect the kickback condition based on a comparison between the determined angular acceleration and a configurable detection threshold.
    Type: Application
    Filed: September 20, 2021
    Publication date: December 21, 2023
    Inventors: Magnus Rosén, Victor Johansson, David Dufke, Johan Berg
  • A HAND-HELD ELECTRICALLY POWERED CUT-OFF TOOL WITH A KICKBACK MITIGATION FUNCTION
    Publication number: 20230396056
    Abstract: A hand-held electrically powered cut-off tool (100) for cutting concrete and stone by a rotatable cutting disc (105), the cut-off tool (100) comprising an electric motor (130) arranged to be controlled by a control unit (110) via a motor control interface (120), wherein the control unit (110) is arranged to obtain data indicative of an angular velocity of the cutting disc (105), and to detect a kickback condition based on a decrease in angular velocity, and wherein the control unit (110) is arranged to electromagnetically brake the electric motor (130) in response to detecting a kickback condition.
    Type: Application
    Filed: September 13, 2021
    Publication date: December 7, 2023
    Inventors: Magnus Rosén, Victor Johansson, David Dufke, Johan Berg
  • A HAND-HELD ELECTRICALLY POWERED CUT-OFF TOOL WITH A KICKBACK MITIGATION FUNCTION
    Publication number: 20230390963
    Abstract: A hand-held electrically powered cut-off tool (100) for cutting concrete and stone by a rotatable cutting disc (105), the cut-off tool (100) comprising an electric motor (130) arranged to be controlled by a control unit (110) via a motor control interface (120), wherein the control unit (110) is arranged to obtain data indicative of an angular velocity of the cutting disc (105), and to detect a kickback condition based on a decrease in angular velocity, wherein the control unit (110) is arranged to determine an angular acceleration associated with the electric motor (130), and to detect the kickback condition based on a comparison between the determined angular acceleration and a detection threshold, wherein the detection threshold is configured at an angular acceleration between 5000 rad/s2 and 35000 rad/s2, and preferably between 10000 rad/s2 and 30000 rad/s2, and more preferably between 20000 rad/s2 and 30000 rad/s2.
    Type: Application
    Filed: September 20, 2021
    Publication date: December 7, 2023
    Inventors: Magnus Rosén, Victor Johansson, David Dufke, Johan Berg