Patents Assigned to Obshestvo S Organichennoi Otvetstvennostju "Nauchino-Proizvodstvennaya Firma Spettsstroyservis"
  • Cone drill bit
    Patent number: 5485891
    Abstract: A cone drill bit includes legs and attached to them trunnions with cones mounted thereon. A support unit for mounting the cones upon the trunnions includes a strengthened radial thrust ball bearing which transmits a load directed along a cone centerline. Strengthening the ball bearing in order to increase a bit wear resistance is attained by using the balls which diameter is appropriately related to the bit diameter as well as by strengthening a shoulder on the trunnion between the ball and peripheral roller bearings.
    Type: Grant
    Filed: March 21, 1994
    Date of Patent: January 23, 1996
    Assignee: Obshestvo S Organichennoi Otvetstvennostju "Nauchino-Proizvodstvennaya Firma Spettsstroyservis"
    Inventors: Brazhentsev A. Vladimirovich, Brazhentsev V. Pavlovich