Methods for operating window covers

  • US 8,720,525 B2
  • Filed: 06/14/2013
  • Issued: 05/13/2014
  • Est. Priority Date: 11/04/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. A window cover system, comprising:

  • a housing;

    an extendable window cover that is coupled to the housing, the window cover having at least one lift cord that is operably coupled to at least one lift cord pulley;

    a spring drive system that is disposed within the housing and is operably coupled to the lift cord, wherein the spring drive system comprises a lift cord pulley shaft and a spring drive comprising at least one spring having a storage end that is operably coupled to a storage shaft and an output end that is operably coupled to an output shaft, a beveled gear set having a first gear operatively connected to the spring drive output shaft and a second gear operably connected to the lift cord pulley;

    wherein the output shaft has two ends, wherein one of the ends terminates within the housing and is rotatable along with the first gear, thereby eliminating the need for an external hand operated cord to raise and lower the window cover.

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