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Power drive for a movable closure with ball nut driven flexible cable

  • US 5,787,636 A
  • Filed: 12/20/1995
  • Issued: 08/04/1998
  • Est. Priority Date: 12/20/1995
  • Status: Expired due to Fees
First Claim
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1. A moveable closure and a power drive for accommodating manual and powered operation of said moveable closure between an open position and a closed position with respect to a portal defining a passage through a barrier, said power drive comprising:

  • an elongate flexible drive member connectible to said moveable closure through a non-linear path, said flexible member including a push/pull cable having at least one wire member helically wound in uniformly longitudinally spaced turns around a flexible core member over at least a portion of a longitudinal length of said cable to define an unobstructed helical groove with side wall portions defining an unobstruted open area between adjacent helical windings and a bottom wall portion of the helical groove formed by said core member of said flexible drive member; and

    ball nut drive means having a plurality of recirculating balls operably engaged with said unobstructed helical groove and selectively moving said drive member longitudinally through said non-linear path in response to rotation of said ball nut drive means, and for selectively positioning said moveable closure in said open and closed positions with respect to said passage through said barrier.

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