Method and a device for the manufacturing of washers for locking and washer for locking

{
  "publication_number": "US9636738B2",
  "country": "US",
  "kind": "B2",
  "title": "Method and a device for the manufacturing of washers for locking and washer for locking",
  "abstract": "A method for the manufacturing of circular washers for locking from blanks, a washer having a central hole, a first side comprising a pattern of radially extending teeth and a second side comprising a pattern of radially extending cams. The method is especially comprised in the steps of producing a washer blank having an annular shape; introducing the washer blank into a die assembly for forming a closed shaping space by a lower die portion, an opposing upper die portion, a central die portion and a support piece, the central die portion extending through a washer blank central hole; forming the blank to a washer by mutual movement of said lower and upper die portions; and opening the closed shaping space to extract the formed washer. The invention also relates to a device and a washer.",
  "claims": [
    "1. A method for the manufacturing of circular washers for locking from blanks, a washer having a central hole, a first side comprising a pattern of radially extending teeth and a second side comprising a pattern of radially extending cams, comprising the steps of producing a washer blank having an annular shape; introducing the washer blank into a die assembly for forming a closed shaping space by a lower die portion, an opposing upper die portion, a central die portion and a support piece providing a circumferential outer wall of said closed shaping space, the central die portion extending through a washer blank central hole; forming the blank to a washer, in said closed shaping space, by mutual movement of said lower and upper die portions; opening the closed shaping space to extract the formed washer.",
    "2. A method according to claim 1, comprising the step of cutting the blank from a thin strip.",
    "3. A method according to claim 1, comprising the step of forming the blank from a wire having a circular cross-section.",
    "4. A method according to claim 1, comprising the step of forming the blank from a wire having a square cross-section.",
    "5. A method according to claim 2, comprising the step of cutting the blank in the die assembly prior to forming the blank.",
    "6. A method according to claim 1, comprising the steps of introducing the washer blank material between the lower die portion and the upper die portion; forcing the lower die portion against the upper die portion for forming the closed shaping space by the three die portions and the support piece by forcing the upper die portion, against an end stop with the blank material applied in said space; and forming the blank to a washer by further forcing the lower die portion towards the upper die portion.",
    "7. A method according to claim 6, comprising the steps of forcing the upper die portion towards the end stop against a spring force; and pushing out the formed washer by the upper die portion by said spring force when unloading the force exerted by the lower die portion by retracting the lower die portion.",
    "8. A method according to claim 1, comprising the steps of forming the washer with the tooth pattern and the cam pattern extending from the inner periphery of the washer to the outer periphery of the washer.",
    "9. A method according to claim 1, comprising the step of forming the washer with a bevelled configuration at the inner periphery to adapt to a radius under the head of a bolt intended to be locked by a washer configuration, the bevelled configuration preferably being formed on the tooth pattern side of the washer.",
    "10. A method according to claim 1, comprising the step of forming washers with a thickness of down to less than 1 mm, the washers preferably having a standardized outer diameter."
  ],
  "description_excerpt": "The present invention relates to a method for the manufacturing of washers for locking. The present invention also relates to a device for the manufacturing of washers for locking. Further, the invention relates to a washer for locking.\n\nWashers as described above are previously known and provided for eg bolts or the corresponding fastening elements for locking purposes. In a locking system of this kind two washers are arranged in a pair, substantially as shown in FIG. 1, the cam pattern sides facing and engaging each other, the main cam surface inclination being larger than the pitch of the threads, which causes a positive and efficient locking of the fastening element. According to what is previously known the washers are manufactured from a strip blank, which is fed to pass several stations, in which forming and/or punching is performed between upper and lower tools, the pattern of teeth being formed on and substantially covering the upper surface and the pattern of cams being formed on and substantially covering the lower surface of the washer. This known technique is associated with several disadvantages and problems. Thus, there is a possibility that undesired displacements occur between the stations during feeding in the die arrangement, such displacements causing defect washers. Further, the total amount of blank material is quite high. Furthermore, there are restrictions related to the cam and teeth cover on each side of the washers, which decreases the possible load bearing surfaces.",
  "cpc": [
    "B21D 53/22",
    "F16B 39/24",
    "F16B 43/00"
  ],
  "ipc": [
    "B21D 53/22",
    "F16B 39/24",
    "F16B 43/00"
  ],
  "assignees": [
    "ANDERSSON MATTIAS",
    "NORD-LOCK AB"
  ],
  "inventors": [
    "ANDERSSON MATTIAS"
  ],
  "filing_date": "2008-09-26",
  "publication_date": "2017-05-02",
  "grant_date": "2017-05-02",
  "priority_date": "2007-09-28",
  "application_number": "US-68000008-A",
  "family_id": "40511695",
  "citations": [
    "CN1256980A",
    "CN1309592A",
    "CN1453097A",
    "CN1562560A",
    "CN1846072A",
    "DD148016A1",
    "EP0755323B1",
    "EP1660780A1",
    "JP2007245229A",
    "JP2007504409A",
    "JPH05329568A",
    "JPH06106279A",
    "JPH10225737A",
    "JPS6091339A",
    "JPS63220941A",
    "US1381462A",
    "US1560135A",
    "US1915612A",
    "US1995357A",
    "US2008009355A1",
    "US2350756A",
    "US2636253A",
    "US2747266A",
    "US3902209A",
    "US414109A",
    "US4274276A",
    "US4590782A",
    "US4653310A",
    "US5259819A",
    "US6260400B1",
    "US653084A",
    "US7191633B1",
    "US7331874B2",
    "US795794A",
    "US7987691B2",
    "WO2005024253A1",
    "WO2006130106A1"
  ]
}