Device for separating and closing a split mold having two halves

{
  "publication_number": "US5007814A",
  "country": "US",
  "kind": "A",
  "title": "Device for separating and closing a split mold having two halves",
  "abstract": "A device for separating and closing a split mold that comprises a base, a stationary platen, and a movable platen extending upward from the base and oriented to oppose each other, electromagnets, a hydraulic cylinder, and a control panel. The movable platen is capable of movement toward and away from the stationary platen by the hydraulic cylinder. The stationary platen has the electromagnets mounted thereon and the movable platen has the electromagnets mounted thereon. In the use of the device, the mold is positioned upon the base such that the first half is positioned against the stationary platen. The movable platen is moved against the second half and the electromagnets are activated. The movable platen is then moved away from the stationary platen, and the mold halves are held against their respective platens by the attractive forces of the electromagnets. Mold halves are thus separated by the movement of the platen away from the stationary platen in activation of the electromagnets.",
  "claims": [
    "1. A device for separating and closing in a horizontal press a split mold having two halves to permit access to said mold halves, the device comprising: (a) a base which the split mold may be positioned and supported, wherein the base has at least one horizontal beam adapted to carry the weight of the split mold positioned thereon; (b) a stationary platen that extends upwardly from and is rigidly connected to the base and has an electromagnet mounted thereon capable of exerting an attractive electromagnetic force upon a first of the two halves of the split mold when the mold is positioned upon the base and the first of the two mold halves is positioned adjacent the stationary platen; (c) a movable platen that extends upwardly from the base and that opposed the stationary platen, the movable platen capable of travel toward and away from the stationary platen and the movable platen having an electromagnet mounted thereon capable of exerting an attractive electromagnetic force upon a second of the two halves of the split mold when the mold is positioned upon the base and the second of the two mold halves is positioned against the movable platen; (d) a cross member rigidly affixed to the movable platen and extending in the direction of the base beam and slidably engaged with the base beam to retain the perpendicularity of the movable platen relative to the base; and (e) means for moving the movable platen toward and away from the stationary platen, the movement of the movable platen toward the stationary platen acting to close the clearances between the halves of the split mold and the platens and the movement of the movable platen away from the stationary platen separating the first of the two mold halves from the second of the mold halves by the attractive electromagnetic force of the electromagnet of the stationary platen holding the first mold half against the stationary platen and the attractive electromagnetic force of the electromagnet of the movable platen holding the second mold half against the movable platen.",
    "2. The device of claim 1 wherein the means for moving the movable platen is a fluid-powered cylinder.",
    "3. The device of claim 2 wherein the cylinder is a hydraulic cylinder.",
    "4. The device of claim 1 wherein each of the platens has two electromagnets, the first electromagnet located so as to apply an electromagnetic force proximate the bottom of the respective mold half and the second electromagnet located so as to apply an electromagnetic force proximate the top of the respective mold half.",
    "5. The device of claim 4 wherein the first electromagnets are fixed to the platens and the second electromagnets are attached to vertically adjustable shelf assemblies mounted on the platens.",
    "6. The device of claim 1 including means for varying electromagnetic force of the magnets.",
    "7. The device of claim 1 wherein a channel is formed in the base beam that extends between the stationary platen and the movable platen, and the cross member rides within the channel to act as a guide for the travel of the movable platen.",
    "8. The device of claim 1 further including a channel formed in the base member that extends between the stationary platen and the movable platen, the cross member having a plurality of wheels that ride within the channel to act as a guide for the travel of the movable platen."
  ],
  "description_excerpt": "This invention relates to the separation and closing of mold halves outside of the molding machine, for purposes of cleaning or retooling of the mold.\n\nIt is sometimes necessary to be able to separate or close the halves of a split mold outside of the molding machine, typically for the purpose of cleaning or retooling of the mold. In the methods of the prior art, the mold halves are typically separated by tools such as crowbars and scissor jacks. The closure of the mold halves is then commonly accomplished by use of hitting upon the halves with a sledge hammer. Such methods are crude and often result in dings or dents to the mold, often a highly expensive precision part.\n\nThe opening and closing of mold halves by the methods of the prior art are time-consuming and labor-intensive. The mold halves often will bind during the separation or closure of mold halves. Accordingly, a need has existed for a device to separate and close the halves of a mold in an efficient, automated, and non-binding manner that will not result in damage to the mold itself.\n\nIn accordance with the present invention, a device for separating and closing a split mold comprises a base, a stationary platen, a movable platen, lower electromagnets, upper electromagnets, a hydraulic cylinder, and a control panel. The platens extend vertically upward from the base and oppose each other, the movable platen capable of movement toward and away from the stationary platen by the hydraulic cylinder. Each of the platens has an upper and a lower electromagnet mounted therein capable of exerting an attractive electromagnetic force.",
  "cpc": [
    "B29C 33/20",
    "B21D 37/142",
    "B29C 31/006",
    "Y10S 100/917",
    "Y10S 100/918",
    "Y10S 425/033"
  ],
  "ipc": [
    "B21D 37/14",
    "B29C 31/00",
    "B29C 33/20"
  ],
  "inventors": [
    "Raymond L. Saunders",
    "Joseph M. Forrestal"
  ],
  "filing_date": "1990-02-05",
  "publication_date": "1991-04-16",
  "grant_date": "1991-04-16",
  "priority_date": "1990-02-05",
  "application_number": "US-47503590-A",
  "family_id": "23885978",
  "cited_by_count": 24,
  "citations": [
    "US2672664A",
    "US2679668A",
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    "US3159097A",
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    "US3779063A",
    "US4203484A",
    "US4199020A",
    "US4460326A",
    "GB2090190A",
    "US4666387A",
    "US4647273A",
    "US4804318A",
    "US4703644A"
  ]
}