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Tread profile for winter tires

  • US 5,454,411 A
  • Filed: 03/02/1994
  • Issued: 10/03/1995
  • Est. Priority Date: 03/02/1993
  • Status: Expired due to Fees
First Claim
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1. In a winter tire for motor vehicles having a tread, the tread having a width and the width having a middle region, a tread profile, comprising:

  • an imaginary center line of the tread defined in the middle region and circumferentially extending about the tire;

    four circumferential grooves, said circumferential grooves being spaced apart in a lateral direction and defining two middle and two outer longitudinal grooves;

    transverse grooves extending transversely to said circumferential grooves, said transverse grooves being spaced apart in a circumferential direction and demarcating profile blocks therebetween;

    each of said transverse grooves extending with an approximately Z-shaped kink in the middle region of the width of the tread, and each having spaced-apart kink points disposed on different sides of said center line;

    substantially Z-shaped grooves connecting said kink points of mutually adjacent transverse grooves disposed on opposite sides of said center line;

    each of said Z-shaped grooves being formed by two groove segments initially branching off circumferentially from said kink points of said mutually adjacent transverse grooves and a connecting groove diagonally intersecting said center line;

    two identically shaped middle blocks being mirror symmetrical with respect to said connecting groove of said Z-shaped grooves, said middle blocks being demarcated by said two inner circumferential grooves and by said Z-shaped middle groove between each two of said transverse grooves;

    said longitudinal grooves having a given groove width and having individual segments, each of said segments being staggered alternatingly to the left and to the right relative to one another by at least one-half of said given groove width.

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