• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    PURPOSE: A method for preparing a plastic door for household electric appliances, particularly for refrigerator which is able to provide an attractive external appearance for the door and make a joining line between shell and liner invisible and lower the manufacturing cost of the refrigerator door by omitting a process of the final painting and a door prepared thereby are provided. CONSTITUTION: A method for preparing a plastic door(1) for refrigerator comprises steps of: (i) vacuum-molding or pressing to obtain a shell or an outer parts(2) where an inner door liner(3) is bonded; (ii) bending an edge of the outer parts(2) toward an inner hollow(6) of the end part where the bending is carried out to act on the shell portion adjacent to the free edge with keeping the parts or shell being fixed. The plastic door(1) for refrigerator comprises: (i) a door liner(3) having a shelf or a similar member(3b) to support food or container thereof; (ii) a shell or an outer parts(2) which is bonded to the door liner(3); (iii) an insulating gasket which is placed in the side of the door(1); and (iv) sides(10, 10a, 11, 11a) of the shell(2), wherein the shell(2) comprises an edge portion(5a) and the edge portion(5a) is harmonized with a side(8) of the shell and a rear wall(9) of the shell without a discontinuous part.
    公开号:KR20000047754A
    申请号:KR1019990053387
    申请日:1999-11-29
    公开日:2000-07-25
    发明作者:마리탄마르코；시그나마르코
    申请人:다니엘에프.호프；월풀코포레이션；
    IPC主号:
    专利说明:

    Method for constructing a bent-edged plastic door for a household electrical appliance, in particular a refrigerator, and the door obtained in this manner}
    The present invention relates to a method of manufacturing a plastic door for a household electrical appliance, in particular a refrigerator, according to the introduction of the main claims. The invention also relates to a door obtained by this method.
    As is well known, each refrigerator door, for example a refrigerator door of a multi compartment upright refrigerator, comprises a shell or external part to which a door liner is coupled. Conventional insulating material is provided between the two parts. The door liner may include support shoulders for shelves to support food and food containers. Conventional encapsulation elements are provided along the liner edges.
    The door shell and liner are manufactured by conventional molding methods such as vacuum-forming or pressing. After they are formed they are bonded together and an insulating material such as polyethylene is inserted (injected) between them. The shell also supports conventional joining components having hinges or comprising seats for joining.
    Known methods of making plastic doors for refrigerators generally result in doors with sharp edges. The joint between the shell and the liner can often be seen along these edges. This obviously has a negative impact on the appearance of the product.
    U. S. Patent No. 5716581 describes a method for thermoforming a plastic refrigerator door of this type. According to the known method, the shell is formed with an annular flange facing the inside of the shell for receiving the edge of the liner. In this regard, after the door liner is thermoformed, a plastic sheet is placed thereon and thermoformed to form the shell. Immediately after this is completed, the shell and liner are joined together and heat is applied along their contacting edges to join them by fusion of the part. These end edges are cut after the shell and liner are joined together. This therefore means that it is a final product with side parts that always have sharp edges, and the edges of the shell and liner are noticeable. As a result, the invention of the US patent is again a product that does not have a complete appearance.
    It is an object of the present invention to provide an improved method for manufacturing a thermoformed plastic door, such that the door has an attractive appearance.
    Yet another object is to provide a method of this type which provides a product which is reliable and exhibits consistent results.
    Yet another object is to provide a method of this type that has an attractive appearance and no bond line is visible between the shell and the liner along its side edges.
    Yet another object is to provide a method which makes it possible to produce a refrigerator door without undergoing final painting and therefore at a lower cost than doors by known methods.
    It will be apparent to those skilled in the art that these and other objects are achieved by the method according to the appended claims and by the door produced by the method.
    1 is an exploded perspective view of a shell of a door for a refrigerator obtained according to the present invention.
    2 is a perspective view of a door obtained according to the present invention;
    3 is a cross-sectional view taken along the line 3-3 of FIG.
    4 is a schematic cross-sectional view of an apparatus for performing the method according to the invention.
    5 is a partial perspective view of a device portion according to the present invention.
    Explanation of symbols on the main parts of the drawings
    1: door 2: shell
    3: door liner 3a: shoulder
    3b: shelf 4: main body
    4a: joining part 5: edge
    5a: peripheral flange 5e: corner
    6: internal cavity 7: reinforcement element
    8: side wall 9: rear wall
    10: long side 10a: short side
    11: long side 11a: side
    12: peripheral gasket 20: mold
    21: reaction member 21b: actuator
    25 molding member 26 actuator
    29: device
    The present invention is described with reference to the accompanying drawings without limiting the invention.
    1 to 3, the plastic refrigerator door 1 comprises a shell 2 and a door liner 3 fixed to the shell by a known method. The shell comprises a body 4 of thermoplastic material with a continuous edge 5 bent towards the interior 6 of the body 4 (for example in the form of a concave dish). The elongate element is arranged to define a so-called joining component 4a (only one shown in FIG. 1), which is coupled with a conventional hinge member to move the door with respect to the refrigerator housing (not shown). It is fixed to the upper and lower opposing ends of the body 4. A substantially U-shaped reinforcement element 7 is also coupled to the body 4 which is fixed in a known manner (ie mechanical method by thermal deformation) between opposite long sides 10, 11 of the body. . The long sides are connected to the short sides 10a and 11a.
    The door liner 3 comprises a shoulder 3a and a shelf 3b which are supported by the support element 3c which is fixed to the body 4 and fixed or formed in the shoulder in a known manner.
    According to the invention, the edge 5 of the body 4 is smoothly bent to substantially define a peripheral flange 5a extending towards the inner cavity 6 of the body. By this method, the door 1 is assembled (with a usual peripheral gasket 12 located around the door liner 3) and inside the door its sidewalls 8 and In combination with the rear wall 9 without discontinuities, a peripheral surface can be provided which gives the finished product (refrigerator) a particularly attractive appearance.
    The door 1 is obtained by the method according to the invention. According to the method (especially with reference to FIGS. 4 and 5, in which parts corresponding to the already described references are designated by the same reference numerals), the door shell 2 is initially formed by a conventional molding method such as vacuum molding or mold. Obtained by a forming method, the shell is then finished at its edges to remove burrs created during molding (and from any other part of the body 4). The body 4 is manufactured in that the edge of the shell 2 (substantially of the U cross section) is bent to form the flange 5 which extends towards its inner cavity 6 without the parts overlapping each other. Finishing is done to the required dimensions for the next step of the process. This finishing can be done either in its actual molding mold (in its “female” part) or in another female mold 20 (see FIG. 4) where the shell 2 is placed after the molding. Is performed. In the case of this other female mold, the mold is internally processed to have a perfectly smooth surface free of impurities that can scratch or fix the outer surface of the shell. When in the mold 20, the shell 2 has an edge protruding therefrom.
    A reaction member 21 is then inserted into the mold 20 that engages the reaction member 21, for example an actuator located above the mold 20, and is movable perpendicular to the mold. As will be apparent to those skilled in the art, the member comprises several parts 21a movable towards the wall of the mold 20 and for this purpose are associated with the actuator 21b accompanying the member 21. The edge 5 of the shell 2 protruding out of the mold is then heated by a heating element such as a hot air generator, a conventional electric heater, a halogen lamp or the like. When the material of the edge 5 reaches a temperature that softens and becomes deformable (depending on the material itself), a number of molding members distributed along the periphery of each actuator member 26 and the mold 20 25 moves and contacts towards the edge 5 to urge it towards the inner cavity 6 of the shell body 4. The edge is therefore bent at 90 ° to the shell side 8. The forming member 25 is a plurality of elements 29 moved along a plane perpendicular to the side face 8 defined by a suitable guide provided at the peripheral edge 20a of the mold 20 (FIG. 5). Reference). These elements can be located, for example, along the sides 10, 10a, 11, 11a of the body 4 and their edges 5e. The element 29 is adapted to bend the edge 5 uniformly onto the reaction member 21 even at the edges without creating creases along or along the edges or in portions that are overlapped or lifted up. Slide along these elements 29 adjacent to. The element 29 is driven by an actuator 26, for example hydraulic. These elements are preferably wedge shaped with their vertices facing the edge 5 so that they form a flange 5a so that they do not penetrate into the edge.
    The element 29 is preferably coated with a self-lubricating material such as Teflon, which is commercially known, so that the plastic surface of the shell edge 2 will not be damaged or scratched.
    After the bending, the element 29 is lifted from the mold so that the movable member 21a of the reaction member is lifted from the mold so that the shell body 4 with its edge bent towards its inner cavity 6 can be pulled out. It is recovered.
    At this time, the shell 2 is provided with each joining component 4a. As mentioned above, the joining component supports the hinge for movement of the door 1 with respect to the refrigerator housing (not shown). The hinge (not shown) is a known form that includes, for example, a hinge arm fixed to the refrigerator housing for engagement with a seat provided in the joining component of the door 1. Threaded pins engage the screws provided on the hinge arm, and the pins also firmly engage the door 1 and a bush to move the door adjacent to the hinge formed in this way.
    Alternatively, the threaded pin and the bush of the door can be replaced by a suitably formed injection molded box 40 pre-mounted directly to the arm by pressing and inserting the same axis of rotation as the door. At may rotate around the hinge arm. The box is then pressed into the seat provided on the door joining part 4a by a reacting fin or tooth, not shown (which opens the box when its opening direction is reversed). Extraction from the door).
    In terminating the operation, the door liner 3 is coupled to the shell 2 in a known manner.
    In a variant of the method, the edge 5 of the shell 2 is formed by a forming element that rotates about a hinge mounted to the edge 20a of the mold 20 or by one or more rollers extending along the edge. Can be bent and arranged such that the edge is bent towards the inside of the shell body 4.
    The present invention also provides a modular system for manufacturing a refrigerator door, the system comprising elements that can be inserted or removed continuously as needed.
    权利要求:
    Claims (10)
    [1" claim-type="Currently amended] It is made of plastic and comprises a shell or outer part 2 to which an inner door liner 3 is coupled, at least the shell 2 being vacuum-forming or pressing. In the household electrical appliance obtained by a known molding method such as), in particular the manufacturing method of the door 1 for a refrigerator,
    After the forming step, the edge of the shell (2) is deformed and bent towards the interior (6) of the shell, the bending being carried out along the entire peripheral edge of the shell.
    [2" claim-type="Currently amended] The method of claim 1,
    The peripheral edge (5) of the shell (2) is characterized in that it is bent while holding the shell in a forming mold.
    [3" claim-type="Currently amended] The method of claim 1,
    After the shell (2) is formed, the shell is removed from the molding mold and moved to another mold whose peripheral edge (5) is bent.
    [4" claim-type="Currently amended] The method according to any one of claims 1 to 3,
    Heating the edge (5) of the shell (2) before bending the shell, so that the edge protrudes from the mold (20) in which the shell is housed.
    [5" claim-type="Currently amended] The method of claim 1,
    The edge 5 is bent by pushing each part provided along the sides 10, 10a, 11, 11a of the shell towards the interior 6 of the shell, the pushing being simultaneously throughout the part. And continuously producing the door.
    [6" claim-type="Currently amended] The method of claim 1,
    The edge (5) is a method of manufacturing a door, characterized in that for successively pushing the edge portion present along the side (10, 10a, 11, 11a) of the shell towards the inside of the shell.
    [7" claim-type="Currently amended] The method of claim 1,
    At least one element forming the joining part (4a) of the door is combined with the shell after the peripheral edge (5) of the shell is bent.
    [8" claim-type="Currently amended] The method of claim 1,
    Reinforcing element (7) is characterized in that the door (1) is engaged with the shell (1) after the peripheral edge (5) of the shell is bent.
    [9" claim-type="Currently amended] The method of claim 1,
    And the door liner is fixed to the door after the joining component (4a) and the reinforcing element are installed.
    [10" claim-type="Currently amended] A shell or external part 2 which engages with a door liner 3 with a shelf or similar member 3b for supporting food or their container, and is usually insulated along the side of the door 1 In the refrigerator door (1) obtained by the method of claim 1, a gasket (insulating gasket) is arranged, the side of which coincides with the sides (10, 10a, 11, 11a) of the shell (2).
    These shells comprise an end portion 5a which is bent towards the door liner 3, which end portion is coordinated without discontinuity with the side wall 8 of the shell and the rear wall 9 of the shell. Refrigerator door.
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    同族专利:
    公开号 | 公开日
    IT1303634B1|2001-02-21|
    ITMI982602A1|2000-06-01|
    KR100637009B1|2006-10-23|
    DE69904691D1|2003-02-06|
    US6630097B1|2003-10-07|
    EP1005976A2|2000-06-07|
    DE69904691T2|2003-09-18|
    BR9905764A|2000-09-05|
    EP1005976B1|2003-01-02|
    CN1174851C|2004-11-10|
    CN1263246A|2000-08-16|
    EP1005976A3|2000-07-12|
    ES2188087T3|2003-06-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1998-12-01|Priority to ITMI982602
    1998-12-01|Priority to ITMI98A002602
    1999-11-29|Application filed by 다니엘에프.호프, 월풀코포레이션
    2000-07-25|Publication of KR20000047754A
    2006-10-23|Application granted
    2006-10-23|Publication of KR100637009B1
    优先权:
    申请号 | 申请日 | 专利标题
    ITMI982602|IT1303634B1|1998-12-01|1998-12-01|Method for manufacturing an electrical appliance door, in particolareper cooler, made of plastic material with folded edges and door|
    ITMI98A002602|1998-12-01|
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