Spring drive system and window cover

  • US 6,648,050 B1
  • Filed: 10/10/2000
  • Issued: 11/18/2003
  • Est. Priority Date: 11/04/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. A spring drive unit comprising:

  • a base;

    a rotatable shaft mounted to the base;

    a spring mounted to the base and having a first rotatable end and a second rotatable end; and

    a gear transmission comprising a plurality of intermeshed gears, the gear transmission having a given drive ratio between two of the gears thereof, and the gear transmission operatively connected at a first one of the two gears to the second rotatable end of the spring and operatively connected at the second one of the two gears to the rotatable shaft, thereby applying the given drive ratio of the gear transmission between the spring and the rotatable shaft for altering the ratio of the speed of the rotatable shaft relative to the rotating speed of the second rotatable end of the spring and altering the force applied between the spring and the rotatable shaft.

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