Locking shoe and mounting bracket for curl spring window balance system

  • US RE45,328 E1
  • Filed: 06/15/2012
  • Issued: 01/13/2015
  • Est. Priority Date: 01/29/2007
  • Status: Active Grant
First Claim
Patent Images

1. In a window sash counterbalance shoe containing a curl spring disposed with curled convolutions in the shoe and an uncurled length extending to a bracket mounted on a top of the shoe to support the uncurled length of the curl spring during shipment, the bracket having a mounting wall disposed so that a mounting screw can pass through the mounting wall and secure the mounting bracket to a back wall of a shoe channel, the improvement comprising:

  • the mounting bracket having a spring holding wall normal to the mounting wall and disposed to rest on a top surface of the shoe above which the uncurled length of curl spring extends;

    the spring holding wall and the uncurled length of curl spring being configured to interengage so that the uncurled spring length is held by the spring holding wall;

    the spring holding wall extending approximately for the width of the curl spring along an edge of the top surface of the shoe so that the spring holding wall and the mounting wall cooperate to resist a pull exerted by the uncurled length of the curl spring; and

    a brace extends normally from the spring holding wall so that the brace engages the top surface of the shoe in a region spaced from and parallel with the mounting wall.

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