Retaining unit, and ejection mechanism of molding die assembly including retaining unit

{
  "publication_number": "US11345071B2",
  "country": "US",
  "kind": "B2",
  "title": "Retaining unit, and ejection mechanism of molding die assembly including retaining unit",
  "abstract": "A retaining unit comprising: a first member configured to be movable; a second member used in an unmovable fixed state; and a pressing element attached to the second member, and configured to press the first member to engage the first member with the second member, wherein the retaining unit is configured such that the first member can be moved by release of the engagement with the second member when a force at a predetermined level or higher is applied in a movement direction of the first member, and the pressing element is assembled with the second member to constitute a unit.",
  "claims": [
    "1. A retaining unit that is used while being assembled with or attached to a device having a movable element, the retaining unit comprising: a first member configured to be movable; a second member that is assembled with or attached to the movable element of the device; and a pressing element attached to the second member, and configured to press the first member to engage the first member with the second member, wherein the retaining unit is configured such that the first member can be detachably connected to the movable element of the device via the pressing element, connection of the first member with the movable element can be released when a force at a predetermined level or higher is applied in a movement direction of the first member, the first member being a columnar member with an axial direction thereof, the first member having a distal end portion at a distal end of the first member in the axial direction, a body portion, a proximal end in the axial direction, and an enlarged portion at the proximal end, wherein the enlarged portion is larger in diameter than the body portion, and wherein the body portion is larger in diameter than the distal end portion, the pressing element is incorporated such that only the enlarged portion of the first member is pressed by the pressing element, and the first member, the second member, and the pressing element constitute an assembly that can be handled as one unit when the assembly is assembled with or attached to the device.",
    "2. The retaining unit as claimed in claim 1, wherein the enlarged portion of the first member has a recess into which at least a distal end portion of the pressing element is fitted, and the pressing element presses the first member in a state in which at least the distal end portion of the pressing element is fitted in the recess.",
    "3. The retaining unit as claimed in claim 1, wherein the pressing element is detachably assembled with the second member.",
    "4. The retaining unit as claimed in claim 1, wherein the second member is a ring-shaped member provided so as to surround a pressed portion of the first member, one or more of the pressing element are assembled with the second member, and each pressing element is configured such that the distal end portion thereof is projectable from an inner circumferential surface of the second member.",
    "5. The retaining unit as claimed in claim 1, wherein the pressing element is a ball plunger.",
    "6. The retaining unit as claimed in claim 1, wherein the pressing element is configured such that a pressing force thereof to the first member is adjustable in a state in which the pressing element is assembled with the second member.",
    "7. The retaining unit as claimed in claim 6, wherein the pressing element is assembled with the second member via a fixing element, and the fixing element functions also as a means for adjusting the pressing force of the pressing element.",
    "8. An ejection mechanism of a molding die assembly, in which the retaining unit as claimed in claim 1 is assembled, and which is for molding a molded article by a fixed-side die and a movable-side die, the ejection mechanism of the molding die assembly comprising an ejector plate, wherein the second member is fixed to the ejector plate, and the first member functions as an ejector pin.",
    "9. The ejection mechanism of the molding die assembly as claimed in claim 8, wherein the first member is configured such that, when the ejector plate is moved to a predetermined position, the first member is connected with a movable-side receiving plate and is kept at a present position.",
    "10. The ejection mechanism of the molding die assembly as claimed in claim 8, wherein the molding die assembly includes an undercut processing mechanism, and the first member is an ejector pin configured to push out the undercut processing mechanism.",
    "11. The ejection mechanism of the molding die assembly as claimed in claim 8, further comprising one or more ejector pins fixed to the ejector plate or comprising a plurality of the retaining units assembled with the ejector plate, wherein the ejection mechanism of the molding die assembly is capable of multi-stage ejection.",
    "12. The ejection mechanism of the molding die assembly as claimed in claim 8, further comprising one or a plurality of energizing element configured to energize the first member toward such a position where the first member is engaged with the second member, wherein the ejector plate has a recess into which the second member is fitted, and the second member is fixed in a state being fitted in the recess.",
    "13. The ejection mechanism of the molding die assembly as claimed in claim 12, further comprising a holder which houses the energizing element, wherein the holder has an outer holder attached to the movable-side die or the ejector plate, and an inner holder slidably engaged with the outer holder, and the holder restricts a sliding amount of the inner holder relative to the outer holder, to restrict an extension amount of the housed energizing element within a predetermined range.",
    "14. A fixed-side die and/or a movable-side die, comprising the ejection mechanism of the molding die assembly as claimed in claim 8.",
    "15. A molding die assembly comprising the fixed-side die and/or the movable-side die as claimed in claim 14.",
    "16. A retaining unit that is used while being assembled with or attached to a device having a movable element the retaining unit comprising: a first member that is assembled with or attached to the movable element of the device; a second member configured to be movable; and a pressing element attached to the second member, and configured to press the first member to engage the first member with the second member, wherein the retaining unit is configured such that the second member can be detachably connected to the movable element of the device via the pressing element, connection of the second member with the movable element can be released when a force at a predetermined level or higher is applied in a movement direction of the second member, and the first member being a columnar member with an axial direction thereof, the first member having a distal end portion at a distal end of the first member in the axial direction, a body portion, a proximal end in the axial direction, and an enlarged portion at the proximal end, wherein the enlarged portion is larger in diameter than the body portion, and wherein the body portion is larger in diameter than the distal end portion, and the pressing element is incorporated such that only the enlarged portion of the first member is pressed by the pressing element, and the first member, the second member, and the pressing element constitute an assembly that can be handled as one unit when the assembly is assembled with or attached to the device."
  ],
  "description_excerpt": "The present invention relates to a retaining unit, an ejection mechanism of a molding die assembly including the retaining unit, a fixed-side die, a movable-side die, a molding die assembly, and a molded article.\n\nThere exists an injection molding die (die assembly) having a two-stage ejection mechanism. A conventional two-stage ejection mechanism is configured such that two ejector pins are attached to two ejector plates respectively, a molded article is ejected by the first ejector pin, and thereafter, the second ejector plate is pushed up by the first ejector plate to further eject the molded article by the second ejector pin. In such an ejection mechanism, it is difficult to reduce the size of the mechanism due to the use of two ejector plates.\n\nIn order to solve the problem related to the two-stage ejection mechanism having two ejector plates, developed is a two-stage ejection mechanism having a single ejector plate and an ejector pin which is detachably attached to the ejector plate and of which the movement amount is restricted (see, for example, JP Laid-open Patent Publication No. 2014-97628).\n\nThe two-stage ejection mechanism described in JP Laid-open Patent Publication No. 2014-97628 has a characteristic feature in that the ejector pin and the ejector plate are detachably connected with each other via a magnetic force. By this configuration, it is possible to move the ejector pin and the ejector plate in an integrated manner. Further, it is also possible to move only the ejector plate while restricting the movement of the ejector pin.",
  "cpc": [
    "B29C 45/4435",
    "B29C 33/442",
    "B29C 43/42",
    "B29C 45/26",
    "B29C 45/4005",
    "B29C 45/44",
    "F16B 21/165"
  ],
  "ipc": [
    "B29C 45/26",
    "B29C 45/40",
    "B29C 45/44",
    "F16B 21/16"
  ],
  "assignees": [
    "Technocrats Corp"
  ],
  "inventors": [
    "Masanori Sorimoto"
  ],
  "filing_date": "2018-12-27",
  "publication_date": "2022-05-31",
  "grant_date": "2022-05-31",
  "priority_date": "2017-04-17",
  "application_number": "US-201816234417-A",
  "family_id": "63855735",
  "cited_by_count": 0,
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}