Coupling for a mill roll

{
  "publication_number": "US4305678A",
  "country": "US",
  "kind": "A",
  "title": "Coupling for a mill roll",
  "abstract": "A coupling between a roll of a heavy rolling mill and a cardan shaft, wherein the roll and a connecting member are joined by a mortise-and-tenon joint with the roll having a projection and the connecting member having a recess to receive said projection, the joint being such as to prevent relative rotation. The leading end of the projection and the base of the recess have respectively a pair of mutually corresponding conical surfaces which are coaxial with the axis of the projection and are urged into engagement in order to align the axes of the roll and the connecting member. In order to achieve rigid coupling of the roll and the connecting member, there is provided a split ring which in unmounted condition is axially movable along the said projection and which is radially compressible by closure of the split or splits to grip the said projection. The split ring and the mouth of the said recess have respectively a second pair of mutually corresponding conical surfaces which are coaxial with the axis of the projection. There are pulling means for drawing the respective pairs of conical surfaces into engagement.",
  "claims": [
    "1. In a coupling between a roll of a heavy rolling mill and a cardan shaft, wherein the roll and a connecting member are joined by a mortise-and-tenon joint with the roll having a projection with flat surfaces thereon and the connecting member having a recess to receive said projection, the joint being such as to prevent relative rotation and the leading end of the projection and the base of the recess having respectively a pair of mutually corresponding conical surfaces which are coaxial with the axis of the projection and are urged into engagement in order to align the axes of the roll and the connecting member, the improvement that, in order to achieve rigid coupling of the roll and the connecting member, there is provided a split ring which in unmounted condition is axially movable along the said projection and which is radially compressible by closure of the split or splits to grip the said projection, the ring and the mouth of the said recess having respectively a second pair of mutually corresponding conical surfaces which are coaxial with the axis of the projection, and there being provided first pulling means for drawing the first said pair of conical surfaces into engagement and second pulling means for drawing the said second pair of conical surfaces into engagement.",
    "2. Coupling according to claim 1 wherein the first said pulling means comprises at least one draw bolt which passes through the connecting member into the end of the projection.",
    "3. Coupling according to claim 1 or claim 2 wherein the second said pulling means comprises a hold-down ring extending around the projection and engaging the split ring and a plurality of draw bolts which draw said hold-down ring towards the connecting member."
  ],
  "description_excerpt": "1. Field of the Invention The invention relates to a coupling for mill rolls, for use in the iron and steel industry to couple a roll with a cardan shaft. 2. Description of the Prior Art It is known for the connection between the roll and a connecting member which transmits drive from a cardan shaft to be embodied as a mortise-and-tenon joint, secured against rotation. For this purpose, the roll is provided with a pin or projection and the connecting member with a hole or recess to receive the projection. This type of coupling is used for slab rolls in slabbing mills and for roughing rolls and finishing rolls in hot strip mills. The drive for such heavy mill stands is supplied by an electric motor, the power of which after reduction in speed is split and led to two rolls by means of cardan shafts. The rolls are journalled in so-called chucks. During operation, the thickness of the rolled material in the gap between the two workrolls reduces, so that the chucks in the roll stand should be movable and in consequence the angle of the cardan shafts must be variable. The roll and the cardan shaft are coupled to each other by means of the connecting member.\n\nUsually the connection between the roll and the connecting member is a mortise-and-tenon one, for which purpose the roll has a projection which fits with the least possible play into a hole in the connecting member. This play, however, is sufficient to allow the joint to be easily assembled and disassembled. This radial play required for assembly and disassembly is eliminated after assembly by means of a radial bolt.",
  "cpc": [
    "B21B 35/141",
    "F16B 2200/10",
    "F16D 1/108",
    "Y10T 403/7054",
    "Y10T 403/7056",
    "Y10T 403/7058"
  ],
  "ipc": [
    "B21B 35/14",
    "F16D 1/06"
  ],
  "assignees": [
    "HOOGOVENS IJMUIDEN BV"
  ],
  "inventors": [
    "MAJOOR HENDRIK"
  ],
  "filing_date": "1979-10-02",
  "publication_date": "1981-12-15",
  "grant_date": "1981-12-15",
  "priority_date": "1978-10-10",
  "application_number": "US-8115979-A",
  "family_id": "19831684",
  "citations": [
    "DE1190266B",
    "DE1475505C3",
    "DE1902665U",
    "DE514228C",
    "DE929287C",
    "DE950782C",
    "DE963597C",
    "US3279870A",
    "US3327497A",
    "US3779037A",
    "US4094179A",
    "US4118135A",
    "US4134700A",
    "US524033A"
  ]
}