{
  "$type": "site.standard.document",
  "description": "A heavy duty tire 2 includes a tread 4. The tread 4 has a plurality of circumferential main grooves 12. The plurality of circumferential main grooves 12 include a circumferential narrow groove 38. The circumferential narrow groove 38 includes a body portion 30, a tapered portion 32, and a widened…",
  "path": "/patents/1388121",
  "publishedAt": "2025-07-23T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C11/0309",
    "SUMITOMO RUBBER IND [JP]"
  ],
  "textContent": "A heavy duty tire 2 includes a tread 4. The tread 4 has a plurality of circumferential main grooves 12. The plurality of circumferential main grooves 12 include a circumferential narrow groove 38. The circumferential narrow groove 38 includes a body portion 30, a tapered portion 32, and a widened portion 34. When the tread 4 comes into contact with a road surface, a pair of wall surfaces 24 of the circumferential narrow groove 38 come into contact with each other at the body portion 30. In a contour line of the circumferential narrow groove 38 in a meridian cross-section of the tire 2, an outer transition portion 40 which is a portion transitioning from the tapered portion 32 to the body portion 30 is represented by an arc tangent to a contour line of the tapered portion 32 and a contour line of the body portion 30, and an inner transition portion 42 which is a portion transitioning from the body portion 30 to the widened portion 34 is represented by an arc tangent to the contour line of the body portion 30 and a contour line of the widened portion 34.",
  "title": "HEAVY DUTY TIRE"
}