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Constant tensioning device

  • US 4,389,228 A
  • Filed: 08/26/1981
  • Issued: 06/21/1983
  • Est. Priority Date: 08/26/1981
  • Status: Expired due to Term
First Claim
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1. A filter bag assembly comprising:

  • a filter bag;

    means connected to said filter bag for maintaining it under substantially constant tension, said means including a rotatably mounted cam having an axis of rotation, a cable at least partially trained around a surface of said can, and spring means urging said cam to rotate in a first direction;

    said spring means exerting a varying spring force dependent upon the rotational position of the cam, said cable arranged with respect to said cam so that when the cam is in a first rotational position where the spring force is relatively high, the cable is tangent to the surface of said cam at a first distance from the axis of rotation of said cam, and when the cam is in a second rotational position where the spring force is relatively low, the cable is tangent to the surface of said cam at a second distance from the axis of rotation of said cam which is smaller than said first distance.

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