Patents Represented by Law Firm Phillips, Moore, Weissenberger, Lempil & Majestic
  • Patent number: 4077634
    Abstract: A seal arrangement is provided having a pair of elastomeric seal rings with a seal band adjacent the innermost diameter of the rings. The seal rings are retained by means of a pair of elastomeric torics, one of which is relatively immovable and the other of which is relatively movable. The movable toric is positioned between supporting structure incorporating ramps of low angle, which improves the pressure, velocity relationships of the seal and permits operation at higher speeds. Retention of the other toric stabilizes the seal and prevents cocking or tilting of the rings so as to maintain the sealing plane perpendicular to the rotational axis. An arrangement is thus provided wherein the seals are of nearly equal surface area which produces pressure balanced seals and a more constant, level force along the axis.
    Type: Grant
    Filed: September 13, 1976
    Date of Patent: March 7, 1978
    Assignee: Caterpillar Tractor Co.
    Inventor: Donald F. Durham