Patents by Inventor Stefan Valfridsson

Stefan Valfridsson 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: 9855650
    Abstract: The present invention relates to a method and devices for mounting and securing a handle (110) on a power driven hand tool (100) The power driven hand tool (100) is provided with a main body (104) comprising a housing (106) with a drive unit for driving a working member of the tool (100), a handle (110) for user operation of the tool (100), and a connecting part (112) for connecting the handle (110) with the main body (106). Further, a front end of the handle (110) may be inserted into a rear end of the connecting part (112) in a first rotational position in relation to the connecting part (112), and the handle (110) may be rotated into a second rotational position in relation to the connecting part (112). In the second rotational position, the handle (110) and the connecting part (112) are locked to each other by means of an automatic locking mechanism.
    Type: Grant
    Filed: June 4, 2010
    Date of Patent: January 2, 2018
    Assignee: HUSQVARNA AB
    Inventors: Carl-Johan Fong, Stefan Valfridsson, Ulrik Gejervall, Matias Nybacka
  • Patent number: 9460869
    Abstract: The invention relates to an electrically powered hand tool which comprises a device for providing tactile feedback to an operator of the tool. The tool further comprises a user-operated trigger for activating the working member of the tool. The tactile feedback provided by the tool alerts the operator about the activation status of the tool. More specifically, the operator is provided with an indication that the power to the tool is ON. The tactile feedback is provided at least from the time when the power to the tool is turned ON to the point in time when the trigger is pulled to activate the working member of the tool.
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: October 4, 2016
    Assignee: HUSQVARNA AB
    Inventors: Stefan Valfridsson, Carl-Johan Fong, Ulrik Gejervall
  • Publication number: 20130097876
    Abstract: The present invention relates to a method and devices for mounting and securing a handle (110) on a power driven hand tool (100) The power driven hand tool (100) is provided with a main body (104) comprising a housing (106) with a drive unit for driving a working member of the tool (100), a handle (110) for user operation of the tool (100), and a connecting part (112) for connecting the handle (110) with the main body (106). Further, a front end of the handle (110) may be inserted into a rear end of the connecting part (112) in a first rotational position in relation to the connecting part (112), and the handle (110) may be rotated into a second rotational position in relation to the connecting part (112). In the second rotational position, the handle (110) and the connecting part (112) are locked to each other by means of an automatic locking mechanism.
    Type: Application
    Filed: June 4, 2010
    Publication date: April 25, 2013
    Applicant: HUSQVARNA AB
    Inventors: Carl-Johan Fong, Stefan Valfridsson, Ulrik Gejervall, Matias Nybacka
  • Publication number: 20130025135
    Abstract: A hedge trimmer (1) comprises an electric motor (3) and at least two cutting blades (5,6), each blade comprising at least one row of teeth with the motor being connected to at least one of the blades so that rotation of the motor (4) produces a movement of at least one of the blades relative to the other, a first user operable switch (10) for operation of the hedge trimmer blades and a second user operable switch (11) which enables a user to select between at least two operating modes of the hedge trimmer, the two modes comprising a hedge trimming mode in which operation of the first user operable switch causes a reciprocal motion of the at least one blade, and a secateur mode in which operation of the switch causes a single cutting cycle to be performed. A two ratio gearbox may be provided to enable the blades to move at a lower speed and with higher torque when in the secateur mode compared with the hedge trimming mode.
    Type: Application
    Filed: March 30, 2010
    Publication date: January 31, 2013
    Applicant: HUSQVARNA AB
    Inventors: Ulrik Gejervall, Stefan Valfridsson
  • Publication number: 20120249313
    Abstract: The invention relates to an electrically powered hand tool which comprises a device for providing tactile feedback to an operator of the tool. The tool further comprises a user-operated trigger for activating the working member of the tool. The tactile feedback provided by the tool alerts the operator about the activation status of the tool. More specifically, the operator is provided with an indication that the power to the tool is ON. The tactile feedback is provided at least from the time when the power to the tool is turned ON to the point in time when the trigger is pulled to activate the working member of the tool.
    Type: Application
    Filed: December 16, 2009
    Publication date: October 4, 2012
    Applicant: Husqvarna AB
    Inventors: Stefan Valfridsson, Carl-Johan Fong, Ulrik Gejervall
  • Publication number: 20030183574
    Abstract: The present invention is for method and means for purification of water using reversed osmosis. Water is forced through a membrane element (10) under pressure, which is obtained by a high pressure pump (2), where the water which is supplied to the element (10) is both from the outside supplied, unpurified water and internally circulated water that has passed by the element at its inlet side. The high pressure pump operates intermittently and the quantity of water that is circulated internally is at least as large as the quantity of water that is supplied from the outside. After that the pressure has been reduced there is a time delayed flush cleaning of the element (10) by flushing with water that is supplied from outside.
    Type: Application
    Filed: April 17, 2003
    Publication date: October 2, 2003
    Inventors: Per-Ake Claesson, Zsolt Hegmegi, Tibor Nemeth, Stefan Valfridsson
  • Patent number: D497409
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: October 19, 2004
    Assignee: Aktiebolaget Electrolux
    Inventor: Stefan Valfridsson