Patents Represented by Law Firm Webb, Bunden, Robinson & Webb
  • Impact tool
    Patent number: 4011795
    Abstract: A hydraulic impact tool wherein hydraulic power is used to lift a ram against a bias to store energy and wherein the ram then is permitted to accelerate toward an impliment to which it imparts energy upon impact. A reciprocating cylindrical sleeve slidable about the ram is arranged to control the hydraulic fluid. The sleeve is initially carried in each direction by the ram and is shifted relative to the ram by hydraulic power.
    Type: Grant
    Filed: March 24, 1975
    Date of Patent: March 15, 1977
    Assignee: Schroeder Brothers Corporation
    Inventors: Henry P. Barthe, John S. Schroeder