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Plastic spring

  • US 3,990,674 A
  • Filed: 10/08/1975
  • Issued: 11/09/1976
  • Est. Priority Date: 10/08/1975
  • Status: Expired due to Term
First Claim
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1. An integral positioning lever and centering spring for pivoting the crank arm of a flow control member such as a damper located in a fluid passage of a housing comprising:

  • an elongated body with means located at a mid-portion to permit mounting the lever for pivotal movement;

    one end of the body extending a sufficient distance from the mounting means to permit manual actuation of the body between open and closed operative positions;

    a second end portion of said body engaging the crank arm to produce movement of said crank arm between open and closed operative positions corresponding to open and closed damper positions during which movement the second end portion and the crank arm passes through a plane defined by the damper axis and the location about which said body pivots;

    means formed in the second end portion to accommodate movement of the crank arm in an axial direction with respect to the elongated body;

    said means including strip portions extending on either side of said crank arm which are integrally joined by a connecting portion to form an opening through which said crank arm extends;

    said strip portions being spaced closer together in the axial direction from said opening to cause the crank arm to initially spread the strip portions further apart as the crank arm is moved from one operative position to an intermediate position marked by passage of the crank arm through said plane and to subsequently permit the strip portions to return to a relatively unstressed condition as the crank arm is moved from said intermediate position to the other operative position whereby a resultant positioning force on the crank arm is produced to cause the damper to move in a positive manner into its operative positions.

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