Patents by Inventor David Drennen

David Drennen 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).

  • Publication number: 20060053919
    Abstract: A method for making a ball-nut includes cutting a 360-degree closed-loop surface groove in the inner-circumferential wall portion of a ball-nut body using a whirling-type internal-diameter cutting machine. The closed-loop surface groove surrounds the longitudinal axis of the wall portion, is adapted for receiving a plurality of ball bearings, includes a helical-grooved portion substantially coaxially aligned with the longitudinal axis, and includes a crossover-grooved portion. A method for making a ball-screw includes cutting at least one 360-degree closed-loop surface groove in the outer-circumferential wall portion of a ball-screw body using a whirling-type external-diameter cutting machine. The closed-loop surface groove surrounds the longitudinal axis of the wall portion, is adapted for receiving a plurality of ball bearings, includes a helical-grooved portion substantially coaxially aligned with the longitudinal axis, and includes a cross-under-grooved portion.
    Type: Application
    Filed: June 20, 2005
    Publication date: March 16, 2006
    Inventors: Ernest Siler, Ronald Smith, Kathleen Murphy, David Drennen, Patrick Mescher, Thomas Bucholz
  • Publication number: 20050061099
    Abstract: A ball-nut assembly includes a ball nut and a crossover member. The ball nut incudes a radial through slot and an outer surface. The outer surface has a first portion, has a ledge radially recessed from the first portion and at least partially bounding the through slot, and has an undercut wall connecting the ledge and the first portion. The crossover member has a flange and a crossover-grooved portion. A method for making a ball-nut assembly positions the crossover member from outside the ball nut to have the flange supported by the ledge and the crossover-grooved portion located in the through slot. The method also deforms the flange creating a staked portion of the flange which contacts the undercut wall of the outer surface of the ball nut.
    Type: Application
    Filed: November 5, 2004
    Publication date: March 24, 2005
    Inventors: Ernest Silver, David Drennen
  • Publication number: 20050034936
    Abstract: An electric brake caliper includes a ball screw apparatus having a cup-shaped ball screw including an annular cylindrical sidewall disposed about a rotational axis and closed at one axial end thereof by an end wall joined around an entire periphery thereof integrally with the sidewall. The end wall is adapted to form a carrier for operatively supporting at least one planetary gear. The ball screw apparatus also includes a ball screw nut operatively engaged with the ball screw. The annular cylindrical sidewall of the ball screw also defines an axial length of the ball screw and a ball track extending about the sidewall along the axial length of the ball screw from starting point that is adjacent to, but axially spaced from, the closed end of the ball screw. The ball track further includes a ball return track.
    Type: Application
    Filed: August 13, 2003
    Publication date: February 17, 2005
    Inventors: David Drennen, Ernest Siler, James Waag, Craig Osterday, Ronald Smith, Donald Holmes