Patents by Inventor Siegfried ROGALLA

Siegfried ROGALLA 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: 9539653
    Abstract: A twist drill has a shaft and a flute portion, which extends between a drill tip and the shaft and has at least two flutes, which run helically around it at an angle of twist, are separated from one another by two webs and have a land extending between the flutes on the circumference of the flute portion. In order to provide a twist drill that has the features mentioned at the beginning, has better lubrication of the round bevels, less wear, improved guidance and improved concentricity, at least two round bevels that are spaced apart from one another are provided on each land and extend on the land at an angle of inclination in relation to the drill axis that is greater than the angle of twist but less than 90°.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: January 10, 2017
    Assignee: Walter AG
    Inventors: Siegfried Rogalla, Stefan Thoma
  • Publication number: 20150314378
    Abstract: A twist drill has a shaft and a flute portion, which extends between a drill tip and the shaft and has at least two flutes, which run helically around it at an angle of twist, are separated from one another by two webs and have a land extending between the flutes on the circumference of the flute portion. In order to provide a twist drill that has the features mentioned at the beginning, has better lubrication of the round bevels, less wear, improved guidance and improved concentricity, at least two round bevels that are spaced apart from one another are provided on each land and extend on the land at an angle of inclination in relation to the drill axis that is greater than the angle of twist but less than 90°.
    Type: Application
    Filed: December 5, 2013
    Publication date: November 5, 2015
    Applicant: Walter AG
    Inventors: Siegfried ROGALLA, Stefan THOMA