Wire for coiled spring Patent #: 4735403
ApplicationNo. 336476 filed on 04/12/1989
US Classes:267/166, COIL267/180Irregular
ExaminersPrimary: Reger, Duane A.
Attorney, Agent or Firm
Foreign Patent References
International ClassF16F 001/10
Foreign Application Priority Data1989-01-10 JP
AbstractA coil spring has a strand having a width w and a thickness t, such that 1.1ࣘcࣘ1.7, where c is a ratio determined according to c=w/t. Further, the strand has a cross-sectional shape defined by a plurality of partial curves, which are portions of a clothoid, a curve whose radius varies inversely in proportion to its length. Further, the partial curves are combined to form a closed loop. The tangent lines of any adjacent two of the partial curves of the coil spring, at their boundaries where they are combined, are oriented in the same direction.