Truck body closure

{
  "publication_number": "US3913969A",
  "country": "US",
  "kind": "A",
  "title": "Truck body closure",
  "abstract": "Closure for open top truck box body is a single rigid member which opens hingeably on a transverse axis near the upper front edge of the box body and has skirt portions which extend downwardly along sides of the box body in the closed position. Hydraulic cylinders open the closure and pressure of fluid supplied to the cylinders is limited to a pre-selected value so that the cylinders can only raise the closure itself and cannot raise it if it carries an additional load. Thus it cannot be operated to serve as a crane or hoist and cannot be raised if a person is standing on it.",
  "claims": [
    "1. In a load carrying wheeled vehicle open top box body having sides and a front and rear and provided with a closure for the open top of the box body, the combination of a single substantially rigid closure member of substantially rigid material extending entirely over said open top of said box body, said substantially rigid closure member hingedly attached to said box body near the upper front edge of said box body to hingedly open on an axis, said axis being transverse with respect to the vehicle, said axis being disposed both forward from saId upper front edge and at an elevation higher than said upper front edge, at least one hydraulic operating member having two ends and comprising a cylinder and a piston, means for attaching said hydraulic operating member to said substantially rigid closure member outside the interior of said body enclosed by said body and said closure member, means for attaching said hydraulic operating member to a portion of said box body outside the interior of said body enclosed by said body and said closure member, the ends of said hydraulic operating member being attached respectively to said means, and means for supplying hydraulic fluid under pressure to said hydraulic operating member.",
    "2. In the device of claim 1, skirt portions depend downwardly from side and rear edges of said substantially rigid closure member to extend downwardly alongside upper portions of the sides and rear of said box body when said substantially rigid closure member is in the closed position.",
    "3. In a load carrying wheeled vehicle open top box body having sides and a front and rear and provided with a closure for the open top of the box body, the combination of a single substantially rigid closure member of substantially rigid material extending entirely over said open top of said box body, said substantially rigid closure member hingedly attached to said box body near the upper front edge of said box body to hingedly open on an axis, said axis being transverse with respect to the vehicle, said axis being disposed both forward from said upper front edge and at an elevation higher than said upper front edge, at least one hydraulic operating member having two ends and comprising a cylinder and a piston, means for attaching said hydraulic operating member to said substantially rigid closure member outside the interior of said body enclosed by said body and said closure member, means for attaching said hydraulic operating member to a portion of said box body outside the interior of said body enclosed by said body and said closure member, the ends of said hydraulic operating member being attached respectively to said means, and means for supplying hydraulic fluid under pressure to said hydraulic operating member, wherein said open top box body is the box body of a dump truck which has a cab, said box body has a portion projecting over said cab to protect said cab from falling objects and material, two of said hydraulic operating members are provided attached to said means for attaching said hydraulic operating member to said substantially rigid closure member and to said portion of said box body, said means for attaching said hydraulic operating members to said substantially rigid closure member are provided near the upper forward edge of said substantially rigid closure member and said means for attaching said hydraulic operating members to said box body are provided near the forwardmost portion of said projecting portion of said box body.",
    "4. In the device of claim 3, skirt portions depend downwardly from side and rear edges of said substantially rigid closure member to extend downwardly alongside upper portions of the sides and rear of said box body when said substantially rigid closure member is in the closed position.",
    "5. The device of claim 1 wherein said open top box body is the box body of a semi-trailer, two of said hydraulic operating members are provided attached to said means for attaching said hydraulic operating member to said substantially rigid closure member and to said portion of said box body, said means for attaching said hydraulic operating members to said substantially rigid closure member comprise members extending substantially forward from said substantially rigid closure member and said means for attaching said hydraulic operating members to said box body are provided on the front of said box body downwardly from the upper front edge of said box body.",
    "6. The device of claim 1 wherein said meaNs for supplying hydraulic fluid under pressure to said hydraulic operating members comprises means to limit said pressure to a preselected pressure which is inadequate to open said substantially rigid closure member when a substantial weight or downward force is added to said substantially rigid closure member in excess of the weight of said substantially rigid closure member itself."
  ],
  "cpc": [
    "B60J 7/1621"
  ],
  "assignees": [
    "JEFF KO MANUFACTURING CO INC"
  ],
  "filing_date": "1974-03-25",
  "publication_date": "1975-10-21",
  "grant_date": "1975-10-21",
  "priority_date": "1974-03-25",
  "application_number": "US-45472874-A",
  "family_id": "23805824",
  "citations": [
    "US2202216A",
    "US2750871A",
    "US2996047A",
    "US3127817A",
    "US3183873A",
    "US3450431A"
  ]
}