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Attachment assembly and drive unit having same

  • US 9,523,231 B2
  • Filed: 08/31/2010
  • Issued: 12/20/2016
  • Est. Priority Date: 11/10/2003
  • Status: Active Grant
First Claim
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1. A drive unit comprising:

  • a guide channel;

    a first pulley positioned proximate one end of the guide channel, where the first pulley is rotatable about a fixed pulley axis;

    a flexible drive member having a plurality of spaced windows;

    an attachment assembly moveably attached to the guide channel, the attachment assembly comprising,a yoke having laterally spaced side walls connected by a bridge wall, the yoke having a connector attached to the bridge wall,a coupler having a plurality of spaced teeth that are adapted to extend through the plurality of spaced windows of the flexible drive member, anda spring that has a central mounting portion and spring arms at each end, the central mounting portion being sandwiched between the bridge wall and the coupler; and

    an adjustable pulley assembly coupled to the guide channel substantially opposite the first pulley, the adjustable pulley assembly having a second pulley that rotates around a moveable pulley axis that can be adjusted with respect to the fixed pulley axis to adjust the slack in the flexible drive member.

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