Patents by Inventor Heikki Kärnä

Heikki Kärnä 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).

  • Axe
    Publication number: 20190118398
    Abstract: Described is an axe comprising an axe head and a handle having one end portion to which the axe head is arranged. The axe head comprises a handle attaching structure and blade means attached to the handle attaching structure. The blade means are configured to provide a chopping blade and a splitting blade.
    Type: Application
    Filed: April 18, 2017
    Publication date: April 25, 2019
    Inventor: Heikki Kärnä
  • Patent number: 10137587
    Abstract: An axe includes an axe head and a handle. The axe head having a first handle attaching structure, which extends from a first side edge of a frame section and which is located on a first axe head side of the axe head and having a second handle attaching structure, which extends from a second side edge of the frame section and which is located on the first axe head side of the axe head. The frame section of the axe head, the first handle attaching structure of the axe head, the second handle attaching structure of the axe head are parts of a one-piece structure formed by plastically deforming and cutting a flat blade stock of generally uniform thickness.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: November 27, 2018
    Inventor: Heikki Kärnä
  • Publication number: 20160354941
    Abstract: An axe includes an axe head and a handle. The axe head having a first handle attaching structure, which extends from a first side edge of a frame section and which is located on a first axe head side of the axe head and having a second handle attaching structure, which extends from a second side edge of the frame section and which is located on the first axe head side of the axe head. The frame section of the axe head, the first handle attaching structure of the axe head, the second handle attaching structure of the axe head are parts of a one-piece structure formed by plastically deforming and cutting a flat blade stock of generally uniform thickness.
    Type: Application
    Filed: January 26, 2015
    Publication date: December 8, 2016
    Inventor: Heikki KÄRNÄ
  • Axe
    Patent number: 8925207
    Abstract: An axe comprising a blade (3) provided with a cutting edge (6) at one end, and a handle (2), and in which the center of gravity of the axe is located at a distance from the cutting edge (6) of the axe and lies in a center-of-gravity plane (C) of the axe located at a distance from a blade plane (B) of the axe parallel with both the center-of-gravity plane (C) and a normal working motion plane (W) of the axe, and in which the cutting edge (6) of the blade and the center of gravity of the axe are arranged to cooperate when the blade (3) hits wood and the cutting edge (6) of the blade partly penetrates into the wood such that at least some of the impact force of the blade (3) is converted into a rotational motion and a motion of the blade (3) in a curvilinear trajectory, the blade (3) is attached to the handle (2) so that the handle (2) is uncircled by the blade (3).
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: January 6, 2015
    Inventor: Heikki Kärnä