Patents by Inventor Pekka Salmlnen

Pekka Salmlnen 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).

  • Arrangement in rock drill and method of controlling rock drilling
    Patent number: 6273199
    Abstract: An arrangement in a rock drill comprising a shank and a percussion piston and lifting sleeve for moving the shank towards percussion piston, and a method of controlling rock drilling. The arrangement comprises a lifting sleeve around the shank and a plurality of cylindrical lifting pistons around the shank. In the method, upon downward drilling, the magnitude of the feed force of the rock drill is decreased as the number of extension rods increases, and a force is set to act on some lifting pistons to move the shank towards the percussion point.
    Type: Grant
    Filed: May 19, 2000
    Date of Patent: August 14, 2001
    Assignee: Sandvik Tamrock Oy
    Inventors: Timo Kiikka, Timo Muuttonen, Pekka Salmlnen