Patents by Inventor Lars Ederfors

Lars Ederfors 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: 12279549
    Abstract: A robotic work tool (100) comprising a chassis (110) and a body (120). The robotic work tool (100) further comprises at least one input unit (170, 180) for receiving input data relating to an operation of the robotic work tool (100), and at least one collision sensor arrangement (140) for detecting a direction of a movement of the chassis (110) with respect to the body (120). The movement is indicative of a collision. The robotic work tool (100) further comprises at least one controller (130) for controlling operation of the robotic work tool (100). The at least one controller (130) is configured to receive, from the at least one input unit (170, 180), said input data relating to the operation of the robotic work tool (100). The at least one controller (130) is further configured to adapt a collision threshold based on said input data relating to the operation of the robotic work tool (100).
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: April 22, 2025
    Assignee: HUSQVARNA AB
    Inventors: Dan Liljedahl, Lars Ederfors, Magnus Bergenholm, Daniel Wikestad
  • Patent number: 12232443
    Abstract: A height adjustment device may include a height adjustment screw having outer threads and being oriented substantially vertically and arranged rotatably in relation to a chassis, and an adjustment nut connected to a bracket and comprising inner threads for engagement with the threads of the adjustment screw, such that a rotary movement of the height adjustment screw results in a vertical linear movement of the bracket. The adjustment nut may include a first part and a second part which together enclose the adjustment screw, and the first part may be adapted to be attached to the second part. A robotic mower may include the height adjustment device.
    Type: Grant
    Filed: October 8, 2021
    Date of Patent: February 25, 2025
    Assignee: HUSQVARNA AB
    Inventors: Jörgen Johansson, Stefan Stark, Lars Ederfors
  • Patent number: 11953074
    Abstract: An outdoor robotic tool comprising a first part and a second part, wherein the first part supports the second part through a suspension arrangement. The suspension arrangement comprises a first component, which comprises at least one magnetic member; and a second component, which comprises at least one magnetic member. The first component is attached to the first part, wherein the second component is attached to the second part, wherein at least one of the magnetic members of suspension arrangement is a permanent magnet; and wherein a magnetic member of the first component is positioned so as to magnetically interact with a magnetic member of the second component when in use. A magnetic field sensing unit may be present that comprises a control unit and a magnetic field sensor. A method for detecting the alignment of the first part relative to the second part, wherein the method comprises detecting the magnetic field using the magnetic field sensing unit.
    Type: Grant
    Filed: February 7, 2019
    Date of Patent: April 9, 2024
    Assignee: HUSQVARNA AB
    Inventor: Lars Ederfors
  • Patent number: 11781655
    Abstract: A sealing member (2), for waterproof sealing of a volume, comprises a hollow, generally cylindrical body and a sealing area (5a, 5b) at the respective axial ends thereof. At least one sealing area (5a) comprises a first radially extending portion (6) and a second portion (7) extending in a reverse direction partly overlapping the first portion. The second portion (7) has a free end and is arranged for pressing towards the first portion (6), thereby forming a seal with the first portion (6). A sealing system comprises a sealing member (2) as above, a sealing seat (9) for abutment against the sealing member (2), and a counterpart surface (11), for pressing the sealing member (2) against the sealing seat (9). The sealing seat (9) comprises an inclined surface (10). A work tool (1) comprising the above-mentioned sealing system has at least one sealing area (5a) of the sealing member (2) pressed between a housing (4) and a chassis (3) of the work tool (1).
    Type: Grant
    Filed: May 24, 2021
    Date of Patent: October 10, 2023
    Assignee: HUSQVARNA AB
    Inventors: Jörgen Johansson, Stefan Stark, Lars Ederfors
  • Publication number: 20220151143
    Abstract: A robotic work tool (100) comprising a chassis (110) and a body (120). The robotic work tool (100) further comprises at least one input unit (170, 180) for receiving input data relating to an operation of the robotic work tool (100), and at least one collision sensor arrangement (140) for detecting a direction of a movement of the chassis (110) with respect to the body (120). The movement is indicative of a collision. The robotic work tool (100) further comprises at least one controller (130) for controlling operation of the robotic work tool (100). The at least one controller (130) is configured to receive, from the at least one input unit (170, 180), said input data relating to the operation of the robotic work tool (100). The at least one controller (130) is further configured to adapt a collision threshold based on said input data relating to the operation of the robotic work tool (100).
    Type: Application
    Filed: January 30, 2020
    Publication date: May 19, 2022
    Inventors: Dan Liljedahl, Lars Ederfors, Magnus Bergenholm, Daniel Wikestad
  • Publication number: 20220110245
    Abstract: The present disclosure relates to a height adjustment device (1) comprising a height adjustment screw (3) having outer threads (5) and being oriented substantially vertically and arranged rotatably in relation to a chassis (7), and an adjustment nut (9) connected to a bracket (11) and comprising inner threads (13) for engagement with the threads (5) of the adjustment screw (3), such that a rotary movement of the height adjustment screw (3) results in a vertical linear movement of the bracket (11). The adjustment nut comprises a first part (15) and a second part (17) which together enclose the adjustment screw (3), wherein the first part (15) being adapted to be attached to the second part. The present disclosure also considers a robotic mower (101) comprising such a height adjustment device.
    Type: Application
    Filed: October 8, 2021
    Publication date: April 14, 2022
    Inventors: Jörgen Johansson, Stefan Stark, Lars Ederfors
  • Publication number: 20210388905
    Abstract: A sealing member (2), for waterproof sealing of a volume, comprises a hollow, generally cylindrical body and a sealing area (5a, 5b) at the respective axial ends thereof. At least one sealing area (5a) comprises a first radially extending portion (6) and a second portion (7) extending in a reverse direction partly overlapping the first portion. The second portion (7) has a free end and is arranged for pressing towards the first portion (6), thereby forming a seal with the first portion (6). A sealing system comprises a sealing member (2) as above, a sealing seat (9) for abutment against the sealing member (2), and a counterpart surface (11), for pressing the sealing member (2) against the sealing seat (9). The sealing seat (9) comprises an inclined surface (10). A work tool (1) comprising the above-mentioned sealing system has at least one sealing area (5a) of the sealing member (2) pressed between a housing (4) and a chassis (3) of the work tool (1).
    Type: Application
    Filed: May 24, 2021
    Publication date: December 16, 2021
    Inventors: Jörgen Johansson, Stefan Stark, Lars Ederfors
  • Patent number: 11195346
    Abstract: The present disclosure relates to an articulated self-propelled robotic tool 1 with first and second platforms 3, 7, each comprising a wheel set 5, 9 driven by motors. A link arrangement connects the first platform to the second platform at a turning axis 11. A driving error is determined by recording a driving input to the motors and a resulting movement parameter, comparing the resulting movement with an estimated resulting movement which is based on the driving input. Slip is detected using the driving error.
    Type: Grant
    Filed: June 7, 2019
    Date of Patent: December 7, 2021
    Assignee: Husqvarna AB
    Inventors: Magnus Bergenholm, Johan Rogö, Lars Ederfors
  • Publication number: 20210270338
    Abstract: An outdoor robotic tool (10) comprising a first part (20) and a second part (30), wherein the first part (20) supports the second part (30) through a suspension arrangement. The suspension arrangement comprises a first component (40), which comprises at least one magnetic member; and a second component (50), which comprises at least one magnetic member. The first component (40) is attached to the first part (20), wherein the second component (50) is attached to the second part (30), wherein at least one of the magnetic members of suspension arrangement is a permanent magnet (42, 52); and wherein a magnetic member of the first component (40) is positioned so as to magnetically interact with a magnetic member of the second component (50) when in use. A magnetic field sensing unit (60) may be present that comprises a control unit (61) and a magnetic field sensor.
    Type: Application
    Filed: February 7, 2019
    Publication date: September 2, 2021
    Inventor: Lars Ederfors
  • Publication number: 20190378360
    Abstract: The present disclosure relates to an articulated self-propelled robotic tool 1 with first and second platforms 3, 7, each comprising a wheel set 5, 9 driven by motors. A link arrangement connects the first platform to the second platform at a turning axis 11. A driving error is determined by recording a driving input to the motors and a resulting movement parameter, comparing the resulting movement with an estimated resulting movement which is based on the driving input. Slip is detected using the driving error.
    Type: Application
    Filed: June 7, 2019
    Publication date: December 12, 2019
    Inventors: Magnus Bergenholm, Johan Rogö, Lars Ederfors