Patents by Inventor Per Hedström

Per Hedström 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: 9168671
    Abstract: The invention concerns a method for a sawchain and a sawchain. According to the method according to the invention, a sawchain intended to be used for a sawing arrangement for a forestry harvester in order to prevent the whip-like movement of a sawchain that breaks during sawing, is achieved through a method that comprises the steps: —that the sawchain (1) is provided with a means (20) of limiting pivoting that allows a forwardly located link (3, 4, 5, 2) of the sawchain to pivot in a first direction relative to the subsequent link (3, 4, 5, 2) while limiting the ability of the forwardly located link to pivot in an opposite second direction relative to the subsequent link, —that the sawchain (1) is driven around a guide bar (9) with the aid of a driving wheel that is located at one end of the guide bar, —that sawing of a tree trunk is carried out through the guide bar (9) being turned around an axis of rotation.
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: October 27, 2015
    Assignee: Komatsu Forest AB
    Inventors: Tommy Englund, Per Hedström
  • Publication number: 20110226112
    Abstract: The invention concerns a method for a sawchain and a sawchain. According to the method according to the invention, a sawchain intended to be used for a sawing arrangement for a forestry harvester in order to prevent the whip-like movement of a sawchain that breaks during sawing, is achieved through a method that comprises the steps:—that the sawchain (1) is provided with a means (20) of limiting pivoting that allows a forwardly located link (3, 4, 5, 2) of the sawchain to pivot in a first direction relative to the subsequent link (3, 4, 5, 2) while limiting the ability of the forwardly located link to pivot in an opposite second direction relative to the subsequent link,—that the sawchain (1) is driven around a guide bar (9) with the aid of a driving wheel that is located at one end of the guide bar,—that sawing of a tree trunk is carried out through the guide bar (9) being turned around an axis of rotation.
    Type: Application
    Filed: September 25, 2008
    Publication date: September 22, 2011
    Applicant: KOMATSU FOREST AB
    Inventors: Tommy Englund, Per Hedström