{
  "$type": "site.standard.document",
  "description": "The coupling device (5) has a coupling ball (6) located on a coupling support (1) of the towing vehicle, and a ball socket (8) on the trailer to engage on the ball from above. The ball socket consists of a cast body (9) of a ferrous material, with a casting skin on at least the inner side (16) of…",
  "path": "/patents/1098349",
  "publishedAt": "2003-02-19T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60D1/06",
    "SCHARMUELLER JOSEF [AT]"
  ],
  "textContent": "The coupling device (5) has a coupling ball (6) located on a coupling support (1) of the towing vehicle, and a ball socket (8) on the trailer to engage on the ball from above. The ball socket consists of a cast body (9) of a ferrous material, with a casting skin on at least the inner side (16) of the socket. The hardness of the ball socket is lower by 5-12 HRC, pref. 6 HRC, than the hardened steel coupling ball.",
  "title": "Coupling device between a towing vehicle, especially an agricultural tractor, and a trailer"
}