Patents by Inventor Gerald L. Ranck

Gerald L. Ranck 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).

  • Air hammer
    Patent number: 5277260
    Abstract: A percussion drilling apparatus having an outer casing, a fluted inner sleeve affixed to the outer casing, a hammer piston having a longitudinal opening therethrough adapted to fit around extensions of a cyclic valve positioned at the top of the inner casing, and a foot valve mounted atop a drilling bit at the bottom of the apparatus. An air channel positioned between the inner sleeve and outer casing is adapted to cooperate with channels on a reciprocating hammer piston to alternately drive the hammer piston up and down.
    Type: Grant
    Filed: February 24, 1993
    Date of Patent: January 11, 1994
    Inventor: Gerald L. Ranck