{
  "$type": "site.standard.document",
  "description": "A pair of right and left supporting bases () provided on a sidewalk () of a revolving body () and both right and left sides () of a movable ladder () are connected by trajectory restricting members () in a swingable manner. In positions of the left supporting base () which are apart from each…",
  "path": "/patents/1290154",
  "publishedAt": "2021-05-13T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "E02F9/0833",
    "Hitachi Construction Machinery Co., Ltd."
  ],
  "textContent": "A pair of right and left supporting bases () provided on a sidewalk () of a revolving body () and both right and left sides () of a movable ladder () are connected by trajectory restricting members () in a swingable manner. In positions of the left supporting base () which are apart from each other, main body base ends (and ) of first and second hydraulic cylinders ( and ) are pivotally supported, and rod tip ends (and ) of the respective hydraulic cylinders ( and ) are pivotally supported in a common position of the left side () of the movable ladder (). By operating the first and second hydraulic cylinders ( and ) in directions reverse to each other (extension and retraction), in-common pivotally supported parts (and ) are moved, thereby switching a position of the movable ladder () between an extended position and a retracted position.",
  "title": "Lifting and Lowering Device for Construction Machine"
}