JP5546033B2 - Insulated door with viewing window - Google Patents

Description

  The present invention relates to a heat insulating door with a viewing window applied to a refrigerator or the like.

  This type of heat insulating door is known, for example, from Patent Document 1. The heat insulating door (lid body) there is an exterior plate and an interior plate each having a rectangular window opening, a square frame window frame (seal body) mounted on the periphery of both window openings, and a window frame. And a pair of square plate-like glass plates and a heat insulating material filled between the exterior plate and the interior plate. The window frame is made of a rubber molded product, and a first engagement groove into which the glass plate is fitted is formed on the inner peripheral surface thereof. In addition, a second engagement groove that engages with the periphery of the window opening of the exterior plate and a third engagement groove that engages with the periphery of the window opening of the interior plate are formed on the outer peripheral surface of the window frame. . A positioning material made of a channel material is spot-welded in advance on the inner surfaces of the four sides of the window opening of the exterior plate.

  The heat insulation door of patent document 1 is assembled in the following procedures. After fitting a pair of glass plates into the first engagement groove of the window frame, the window frame is made of four positioning members while engaging the second engagement groove of the window frame with the peripheral edge of the window opening of the exterior plate. Fit in between. Next, the presser is fastened to the positioning member with screws, and the window frame is clamped inside and outside by the presser and the exterior plate. Furthermore, after the periphery of the window opening of the interior panel is engaged with the third engagement groove of the window frame and the interior panel is fixed to the exterior panel with screws, the filling space surrounded by the exterior panel, interior panel, window frame, etc. Fill with heat insulation.

Japanese Utility Model Publication No. 58-141185

  In the heat insulating door of Patent Document 1, when the window frame assembled with a pair of glass plates is fitted into the positioning member, the peripheral edge of the window opening of the exterior plate is turned while turning the lip wall of the second engagement groove of the window frame. Needs to be fitted in the second engagement groove. Furthermore, after the presser is fastened to the positioning member with screws, it is necessary to fit the peripheral edge of the window opening of the interior plate into the third engagement groove while turning the lip wall of the third engagement groove of the window frame. For this reason, it is inevitable that a series of operations for assembling the observation window to the heat insulating door takes a lot of time and effort. In addition, in order to properly fix the window frame formed of rubber molded products to the heat insulating door, a positioning material and a presser are provided separately from the exterior plate and the interior plate, and the window frame assembled with the glass plate is provided. There is a disadvantage that it is surrounded by a positioning material, and further needs to be clamped inside and outside by a presser and an exterior plate, which complicates the mounting structure of the viewing window and increases costs.

  The object of the present invention is to simplify the mounting structure of the viewing window, and to easily assemble the window frame and the transparent plate to the window opening with less effort, thereby reducing the overall cost of the heat insulating door provided with the viewing window. It is to reduce.

  The heat insulating door 3 according to the present invention includes an exterior plate 11 and an interior plate 12, a heat insulating material 18 filled between both the plates 11 and 12, and a viewing window 5. The viewing window 5 includes a window frame 16 attached to the periphery of the window openings 13 and 14 opened in the exterior plate 11 and the interior plate 12, and a transparent plate 22 supported by the window frame 16. The window frame 16 includes a side frame 26 attached to the straight side of the window openings 13 and 14 and a corner frame 27 attached to the corners of the window openings 13 and 14. The side frame 26 is provided with an assembly groove 28 for fitting and engaging the straight side of the transparent plate 22. The corner frame 27 includes an outer corner piece 60 and an inner corner piece 61 that sandwich the corner of the transparent plate 22 from the inside and outside. The side frame 26 includes an outer frame portion 32 outside the hinge portion 34 and an inner frame portion 33 inside the hinge portion 34, which is divided into two by a hinge portion 34 provided at the groove bottom of the assembly groove 28. Yes. The outer frame portion 32 is provided with an outer engagement groove 35 into which a straight side portion of the window opening 13 of the exterior plate 11 is fitted and engaged. The inner frame portion 33 of the side frame 26 attached to the window opening 13 of the exterior plate 11 is tilted in a direction away from the outer frame portion 32 with the hinge portion 34 as a center, thereby expanding the assembly groove 28. Thus, the straight side portion of the transparent plate 22 is fitted into the assembly groove 28 and mounted.

  The outer corner piece 60 and the inner corner piece 61 are connected to each other through an engagement hole 80 and an engagement claw 81 that are engaged with each other in an inseparable manner. The outer corner piece 60 and the inner corner piece 61 are connected to the side frame 26 with a connecting structure that fits and engages with each other. The connection structure includes a connection frame portion 74 provided on the outer corner piece 60 and the inner corner piece 61 side, an end portion of the side frame 26 that fits outside the connection frame portion 74, and the connection frame portion 74 and the side frame 26. The engagement recess 82 and the engagement rib 53 are provided in the fitting portion and engaged with each other.

  The window frame 16 attached to the window openings 13 and 14 also serves as a damming body that prevents the heat insulating material 18 filled between the exterior plate 11 and the interior plate 12 from protruding.

  The side frame 26 is provided with seal bodies 36 and 38 that are in close contact with the surface wall of the exterior plate 11 and the interior plate 12 on the filling space 17 side, and a seal portion 49 that is disposed in the assembly groove 28 and is in close contact with the transparent plate 22. . The seal bodies 36 and 38, the seal part 49, and the hinge part 34 are formed integrally with the outer frame part 32 and the inner frame part 33 by a profile extrusion molding method.

  The assembly groove 28 of the side frame 26 is formed in a U-shaped cross section by a groove bottom wall 44 including the hinge portion 34, a groove outer wall 45 and a groove inner wall 46 that are continuous with the groove bottom wall 44. An opening restricting tool 52 that is fitted on each of the walls 44 to 46 forming the assembly groove 28 and restricts the assembly groove 28 from expanding and deforming is attached to the side frame 26.

In the present invention, the window frame 16 of the viewing window 5 is composed of a side frame 26 attached to the straight side of the window openings 13 and 14 and a corner frame 27 attached to the corners of the window openings 13 and 14. Since the side frame 26 and the corner frame 27 can be individually attached to the window openings 13 and 14, the window frame 16 is less troublesome to the window openings 13 and 14. Can be assembled easily.
That is, in the present invention, a window frame that is integrally formed in a conventional circumferential shape is unavoidable. When the window frame is attached to the window opening, the window lip wall is turned while turning the lip wall. Since the troublesome work of fitting the peripheral edge of the opening into the engagement groove is unnecessary, the window frame 16 can be easily assembled to the window openings 13 and 14 with less effort.

  An outer engagement groove 35 is provided in the outer frame portion 32 of the side frame 26, and the peripheral edge of the window opening 13 of the exterior plate 11 is fitted into and engaged with the outer engagement groove 35. Attach to. According to this, the engagement strength between the side frame 26 and the window opening 13 can be increased, and the window frame 16 and the transparent plate 22 can be accurately fixed to the window opening 13. Further, the positioning member and the holding tool, which are indispensable in the conventional observation window mounting structure, can be omitted, and the observation window 5 mounting structure can be simplified.

  After the side frame 26 is attached to the window opening 13, the inner frame portion 33 is tilted in the direction away from the outer frame portion 32 around the hinge portion 34 to expand the assembly groove 28. The straight side portion of the transparent plate 22 is fitted into the assembly groove 28 and attached. As described above, according to the present invention, the transparent plate 22 can be easily assembled with little effort to tilt the inner frame portion 33 with respect to the window frame 16 attached to the window opening 13. As described above, according to the heat insulating door 3 of the present invention, the window frame 16 can be easily assembled to the window openings 13 and 14 and the transparent plate 22 can be assembled to the window frame 16. Therefore, it is possible to reduce the overall cost of the heat insulating door 3 provided with the observation window 5.

  The outer corner piece 60 and the inner corner piece 61 of the corner frame 27 are connected to each other through an engaging hole 80 and an engaging claw 81 that are engaged with each other in an inseparable manner. Further, the connecting frame portion 74 of both pieces 60 and 61 and the end portion of the side frame 26 are fitted and engaged with each other so that the engaged state can be maintained between the engaging recess 82 and the engaging rib 53. . As described above, according to the mounting structure of the viewing window 5 of the present invention, the window frame 16 is attached to the window simply by fitting and engaging the outer corner piece 60 and the inner corner piece 61 with the side frame 26 according to a predetermined procedure. As a result, it can be accurately assembled to the opening 13, and the labor required for mounting the viewing window 5 can be further reduced.

  When the window frame 16 attached to the window openings 13 and 14 also serves as a damming body that prevents the heat insulating material 18 filled between the exterior board 11 and the interior board 12 from sticking out, In comparison, the number of constituent members of the heat insulating door 3 can be reduced, and the overall cost of the heat insulating door 3 can be reduced.

  If the side frame 26 is provided with the sealing bodies 36 and 38 that are in close contact with the surface wall on the filling space 17 side of the exterior plate 11 and the interior plate 12, the gap between the side frame 26 and both the plates 11 and 12 is sealed. Thus, the heat insulating material 18 can be prevented from leaking from the gap. When the seal portion 49 that is in close contact with the transparent plate 22 is arranged in the assembly groove 28, the gap between the side frame 26 and the transparent plate 22 is sealed, and the airtightness in the viewing window 5 can be improved. When the seal bodies 36 and 38 and the seal portion 49 and the hinge portion 34 are formed integrally with the outer frame portion 32 and the inner frame portion 33 by the profile extrusion molding method, compared with the case where the seal bodies 36 and 38 etc. are individually molded. Thus, the side frame 26 can be manufactured at low cost, and the overall cost of the heat insulating door 3 can be reduced accordingly.

  When the opening restricting tool 52 is fitted on the groove bottom wall 44, the groove outer wall 45 and the groove inner wall 46 of the side frame 26, the opening restricting tool 52 can restrict the assembly groove 28 from expanding and deforming. Therefore, even when an external force is applied to the transparent plate 22 or the window frame 16, it is possible to reliably prevent the assembly groove 28 from expanding and deforming and to ensure that the transparent plate 22 is detached from the assembly groove 28. Can be prevented.

It is the sectional view on the AA line in FIG. It is a front view of the refrigerator which applied the heat insulation door which concerns on the Example of this invention. It is a disassembled front view of a heat insulation door. It is the BB sectional view taken on the line in FIG. It is a disassembled perspective view of a window frame. It is a figure which shows the assembly | attachment procedure of a window frame. It is a figure which shows the assembly | attachment procedure of a window frame. It is a figure which shows the assembly | attachment procedure of a window frame. It is sectional drawing of the window frame before mounting | wearing with a multilayer glass. It is a figure which shows the mounting process of a multilayer glass. It is sectional drawing of the window frame after mounting | wearing with a multilayer glass. It is a figure which shows the assembly | attachment procedure of a window frame.

(Example) FIGS. 1-12 shows the Example which applied the heat insulation door which concerns on this invention to the cold table type refrigerator. Note that front and rear, left and right, and up and down in the present embodiment follow the cross arrows shown in FIG. 2 and the front and rear, left and right, and top and bottom displays shown near each arrow.

  In FIG. 2, the refrigerator includes a case main body 1 formed of a box body in which a peripheral wall excluding a front opening is formed by a heat insulating wall. The interior of the case body 1 is a refrigerator compartment 2, and the front opening of the refrigerator compartment 2 is opened and closed by a pair of left and right heat insulating doors 3 and 3 having a double door structure. Each heat insulating door 3 is provided with a handle 4 for opening and closing the door and a viewing window 5 for seeing through the inside of the refrigerator compartment 2. In this embodiment, the observation window 5 is formed in a vertically long rectangular shape. On one side of the case main body 1 is provided a device accommodating portion 6 that accommodates refrigeration equipment. On the upper surface of the case main body 1 and the device accommodating portion 6, a top plate 7 that can be used as a cooking table or the like is provided. Yes.

  As shown in FIG. 3, the heat insulating door 3 includes an exterior plate 11 made of a metal plate such as a stainless steel plate and an interior plate 12 made of a plastic plate. In the part, they are joined by a rivet (blind rivet) (not shown). The exterior plate 11 and the interior plate 12 are respectively formed with quadrangular window openings 13, 14 having the same size, and the viewing window 5 is fitted into both the window openings 13, 14.

  As shown in FIGS. 3 and 4, the viewing window 5 is arranged between a pair of inner and outer (front / rear) square plate-like glass plates (transparent plates) 22 and 22 and the opposing peripheral edges of both glass plates 22 and 22. It is composed of a square frame spacer 23 and a window frame 16 that supports both of them. The entire spacer 23 is accommodated in the window frame 16 and cannot be seen from the outer surface (front surface) or inner surface (rear surface) side of the heat insulating door 3. In a space surrounded by the pair of glass plates 22 and 22 and the spacer 23, a layer of dry air that exhibits a heat insulating effect is formed. Further, in order to further enhance the heat insulation effect, a thin special metal film 24 is coated on the inner surface (rear surface) of the outer (front) glass plate 22 (see FIG. 1).

  A filling space 17 surrounded by the exterior plate 11, the interior plate 12 and the window frame 16 is filled with a heat insulating material 18 made of a foamed resin such as urethane foam. In addition to the original function of holding the glass plate 22 and the spacer 23, the window frame 16 also serves as a damming body that prevents the heat insulating material 18 filled in the filling space 17 from sticking out.

  As shown in FIG. 2, the window frame 16 includes four side frames 26 attached to the four sides of the window openings 13 and 14 and four corner frames attached to the four corners of the window openings 13 and 14. 27. Each side frame 26 is formed by cutting an extrusion-molded product into a predetermined size, and the vertical size of the side frame 26 attached to the left and right side portions of the window openings 13 and 14 is the height of the window openings 13 and 14. It is set larger than the left and right dimensions of the side frame 26 attached to the upper and lower sides. The four corner frames 27 are formed in the same structure.

  As shown in FIG. 5, an assembly groove 28 for fitting and engaging the linear side portion of the glass plate 22 is provided at the front and rear center of each side frame 26. The side frame 26 is divided into two by a hinge portion 34 provided at the groove bottom of the assembly groove 28, and an outer frame portion 32 including a quadrant-shaped bent wall on the outer side (front side) of the hinge portion 34, and the hinge portion And an inner frame portion 33 including an L-shaped bent wall inside (rear side) 34. The hinge part 34 is made of a flexible elastomer, and the outer frame part 32 and the inner frame part 33 are made of a hard plastic material. In this example, ABS resin was used as the hard plastic material.

  As shown in FIGS. 4 and 5, the outer end (front end) of the outer frame portion 32 is provided with an outer engagement groove 35 for fitting and engaging the straight side portion of the window opening 13 of the exterior plate 11. In addition, a tongue-like seal body 36 is provided on the peripheral edge of the inner wall of the outer engagement groove 35. The seal body 36 is elastically brought into close contact with the surface wall on the filling space 17 side of the exterior plate 11 to seal the gap between the peripheral edge of the window opening 13 and the outer engagement groove 35. The inner end (rear end) of the inner frame portion 33 is provided with an inner engagement portion 37 that is a stepped portion that receives a straight side portion of the window opening 14 of the interior plate 12. On the periphery of the portion 37, a tongue-like seal body 38 is provided. The seal body 38 is elastically brought into close contact with the surface wall of the interior plate 12 on the filling space 17 side to seal the gap between the peripheral edge of the window opening 14 and the inner engagement portion 37. Thus, by providing the sealing bodies 36 and 38 at the periphery of the side frame 26, it is possible to prevent the heat insulating material 18 filled in the filling space 17 from leaking out of the filling space 17.

  As shown in FIGS. 1 and 5, the assembly groove 28 of the side frame 26 includes a groove bottom wall 44 including the hinge portion 34, a groove outer wall 45 continuous with the groove bottom wall 44, and a groove inner wall 46. It is formed in a letter shape. On the opposing surfaces of the groove outer wall 45 and the groove inner wall 46, seal portions 49 each including a plurality of protrusions extending in the longitudinal direction of the assembly groove 28 are provided. The seal portion 49 is in close contact with the glass plate 22 and seals the gap between the glass plate 22 and the window frame 16. The seal portion 49 and the previous seal bodies 36 and 38 are made of the same elastomer as the hinge portion 34, and the seal portion 49, the seal bodies 36 and 38, and the hinge portion 34 are outer frame portions by a modified extrusion molding method. 32 and the inner frame 33 are formed integrally.

  The assembly groove 28 in a normal state has a U-shaped cross section, but when the inner frame portion 33 including the groove inner wall 46 is tilted in the direction away from the outer frame portion 32 around the hinge portion 34, the assembly groove 28 is formed. It can be expanded (see FIG. 10). When the external force applied to the inner frame portion 33 is released, the groove bottom wall 44 returns to a flat state due to the elasticity of the hinge portion 34, so that the side frame 26 can be returned to the normal state.

  As shown in FIG. 4, an opening restricting tool 52 that restricts the assembling groove 28 from expanding and deforming is attached to a midway portion in the longitudinal direction of the side frame 26. The opening restricting tool 52 is formed of a frame body having a U-shaped cross section that fits around each of the walls 44 to 46 forming the assembly groove 28, and is formed by cutting the extruded strip material into a predetermined dimension. is there. In a state where the opening restricting tool 52 is externally fitted to the walls 44 to 46 of the assembly groove 28, the groove outer wall 45, the groove inner wall 46, and the wall surfaces of the opening restricting tool 52 facing the both walls 45 and 46 are provided. Are formed with engaging ribs 53 and engaging recesses 54 that engage with each other.

  As shown in FIG. 5, an arc wall 55 having a quadrant in cross section is extended outward (forward) continuously to the groove opening end of the groove outer wall 45, and an outer engagement groove 35 is provided at the extended end. It has been. The hook-shaped portion formed by the arc wall 55 and the groove outer wall 45 is connected to the side frame 26 by being externally fitted to the connection frame portion 74 of the outer corner piece 60 of the corner frame 27 described below. The frame part 74 is connected.

  As shown in FIGS. 1 and 5, the corner frame 27 is configured by connecting an outer corner piece 60 and an inner corner piece 61 that sandwich the corner portions of the pair of glass plates 22 from the inside and outside (front and rear). Both pieces 60 and 61 are made of a hard plastic material. In this embodiment, ABS resin is used as the hard plastic material. The four outer corner pieces 60 are formed in the same structure, and the four inner corner pieces 61 are also formed in the same structure.

  As shown in FIG. 5, the outer corner piece 60 is an injection molded product that integrally includes a right-angle base portion 62 that receives the corner portions of the pair of glass plates 22 and a quadrant engagement frame portion 64. Become. The base portion 62 includes a vertical peripheral wall 66 extending in the vertical direction, a horizontal peripheral wall 68 extending in the left-right direction, and an outer holding wall 70 that closes the outer surfaces (front surfaces) of the peripheral walls 66 and 68. An outer engagement groove 72 for fitting and engaging the corner of the window opening 13 of the exterior plate 11 is formed on the outer peripheral edge of the engagement frame portion 64. Moreover, the connection frame part 74 for engaging with the hook-shaped part of the side part frame 26 demonstrated previously is formed in the both ends of the bending direction of the engagement frame part 64. As shown in FIG. At the inner ends (rear ends) of the vertical peripheral wall 66 and the horizontal peripheral wall 68, step portions 76 and 78 for joining the inner corner piece 61 are formed, and four engagement holes 80 are formed in these step portions 76 and 78. Is provided. Further, the connection frame portion 74 is formed with an engagement recess 82 that engages with the engagement rib 53 provided on the groove outer wall 45.

  The inner corner piece 61 is made of an injection-molded product that integrally includes a right-angle base portion 63 that receives the corner portions of the pair of glass plates 22 and a quadrant engagement frame portion 65. The base 63 includes a vertical peripheral wall 67 extending in the vertical direction, a horizontal peripheral wall 69 extending in the left-right direction, and an inner clamping wall 71 that closes the inner surfaces (rear surfaces) of the peripheral walls 67 and 69. On the outer peripheral edge of the engagement frame portion 65, an inner engagement portion 73 is formed which is a stepped portion that receives the corner portion of the window opening 14 of the interior plate 12. Further, an opening restricting portion 75 is formed continuously at both ends of the engagement frame portion 65 in the bending direction. The operation of the opening restricting portion 75 will be described later. Steps 77 and 79 for joining the outer corner piece 60 are formed on the outer ends (front ends) of the vertical peripheral wall 67 and the horizontal peripheral wall 69, and four engaging claws 81 are formed on these step portions 77 and 79. Is provided. The opening restricting portion 75 is formed with an engaging recess 82 that engages with an engaging rib 53 provided on the groove inner wall 46.

  When the engaging claws 81 of the inner corner piece 61 are engaged with the engaging holes 80 of the outer corner piece 60, the outer corners 76, 77, 78, and 79 of the two pieces 60 and 61 overlap with each other. The piece 60 and the inner corner piece 61 can be connected inseparably. When the corner frames 27 are integrated by connecting both pieces 60 and 61, the corners of the pair of glass plates 22 are connected by the outer clamping wall 70 of the outer corner piece 60 and the inner clamping wall 71 of the inner corner piece 61. It is pinched from (front and back). Further, the connecting frame portion 74 of the outer corner piece 60 and the opening restricting portion 75 of the inner corner piece 61 sandwich the longitudinal outer ends of the groove outer wall 45 and the groove inner wall 46 of the side frame 26 from the inside and outside (front and back). The assembly groove 28 is restricted from expanding and deforming.

  The procedure for assembling the heat insulating door 3 configured as described above will be described below. First, as shown in FIG. 6, the outer engagement groove 72 provided in the outer corner piece 60 of the corner frame 27 is fitted and engaged with the peripheral edge of the window opening 13 of the exterior plate 11 to engage the outer corner piece 60 with the window. Attach to the four corners of the opening 13. Next, as shown in FIGS. 6 and 7, the outer engagement groove 35 provided in the outer frame portion 32 of the side frame 26 is fitted and engaged with the peripheral edge of the window opening 13, and the side frame 26 is opened to the window opening. Attach to 13 sides. At this time, the seal body 36 is in close contact with the exterior plate 11 and the outer frame portion 32 and the outer corner piece 60 are connected. Specifically, the arc wall 55 is moved outward (front side) between the hook-shaped portion where the connecting frame portion 74 of the outer corner piece 60 is configured by the arc wall 55 and the groove outer wall 45 of the outer frame portion 32. Slightly spread and enter (see FIG. 9). As a result, the side frame 26 is sandwiched between the outer corner pieces 60 and 60 from both sides in the longitudinal direction, and the engagement rib 53 of the groove outer wall 45 engages with the engagement recess 82 of the outer corner piece 60. 26 cannot be separated from the outer corner piece 60. FIG. 8 shows a state in which the four outer corner pieces 60 and the side frame 26 are attached to the window opening 13.

  As shown in FIG. 9, when the outer corner piece 60 and the side frame 26 are attached to the window opening 13, the inner end (rear end) of the outer corner piece 60 is more outward than the hinge portion 34 of the side frame 26 ( It is located in front). In other words, even when the outer corner piece 60 and the side frame 26 are connected, the inner frame portion 33 is tilted in the direction away from the outer frame portion 32 around the hinge portion 34 without being obstructed by the outer corner piece 60. Thus, as shown in FIG. 10, the assembly groove 28 can be expanded. Therefore, for example, after the lower edge and the right edge of the glass plate 22 are fitted into the assembly groove 28, the upper and left assembly grooves 28 are expanded, so that the glass plate 22 and the spacer 23 can be easily and efficiently operated. Can be assembled.

  As shown in FIG. 11, after the glass plate 22 and the spacer 23 are assembled to the side frame 26, the groove bottom wall 44, the groove outer wall 45, and the groove inner wall 46 of each side frame 26 are assembled as shown in FIG. The opening restricting tool 52 is externally fitted to the middle part in the longitudinal direction. At this time, the engaging recess 54 of the opening restricting tool 52 and the engaging rib 53 of the groove outer wall 45 and the groove inner wall 46 are engaged with each other. Further, each inner corner piece 61 is connected to the outer corner piece 60 by joining the inner corner piece 61 to the outer corner piece 60 and engaging the engaging claw 81 with the engaging hole 80 of the outer corner piece 60. . At this time, as shown in FIG. 1, the engaging recess 82 provided in the opening restricting portion 75 of the inner corner piece 61 engages with the engaging rib 53 of the groove inner wall 46. By connecting both pieces 60 and 61 and integrating the corner frame 27, the corners of the pair of glass plates 22 are sandwiched from the inside and outside by the corner frame 27, and the lengths of the groove outer wall 45 and the groove inner wall 46 are further increased. Both ends in the direction are clamped from inside and outside by the connecting frame portion 74 and the opening restriction portion 75.

  When the inner corner piece 61 is connected to complete the entire window frame 16, the peripheral edge of the window opening 14 of the interior plate 12 is placed inside the inner frame portion 33 of the side frame 26 and the inner corner piece 61 of the corner frame 27. The seal body 38 is brought into close contact with the interior plate 12 by engaging with the engaging portions 37 and 73. In this state, the peripheral side portions of the interior plate 12 and the exterior plate 11 are joined with rivets or the like. Finally, the heat insulating door 3 is completed by filling the filling space 17 surrounded by the inner and outer plates 11 and 12 and the window frame 16 with the heat insulating material 18.

  Other than the above-described embodiment, the shape of the viewing window 5 is not limited to a vertically long rectangle, and can be formed in a quadrilateral other than the rectangle, other polygons, or an oval. In the above-described embodiment, the two glass plates 22 are arranged inside and outside to constitute the observation window 5 having the multilayer glass structure. However, this is not necessary, and the observation of the multilayer glass structure with three or more glass plates 22 is not necessary. The window 5 can be configured. In addition to the glass plate, an acrylic plate or the like can be applied as the transparent plate 22. Only one transparent plate 22 may be provided. The window frame 16 does not need to have the side frames 26 and the corner frames 27 alternately arranged, and the two or more side frames 26 or the corner frames 27 are continuous in the circumferential direction of the window openings 13 and 14. Can be arranged. Instead of the window frame 16 also serving as a damming body that prevents the heat insulating material 18 from sticking out, it is possible to provide a damming body separately and arrange the window frame 16 on the inner peripheral side of the damming body.

  The elastomer constituting the seal bodies 36 and 38 and the seal portion 49 of the side frame 26 is not necessarily the same as the elastomer constituting the hinge portion 34, and the hinge portion 34 and the seal are provided on the outer frame portion 32 and the inner frame portion 33. The method of providing the bodies 36 and 38 and the seal portion 49 is not limited to the profile extrusion molding method. It is not essential that the hinge part 34 has elasticity, and the hinge part 34 can be configured by a sheet material or the like that does not have elasticity in some cases. If necessary, the hinge part 34 is formed by an integrally formed hinge. Can do. The hinge 34 can be formed at an arbitrary position on the groove bottom wall 44 of the assembly groove 28 and formed at the corner of the groove inner wall 46 or the groove outer wall 45 and the groove bottom wall 44. There may be. Engaging recesses 54 and 82 can be formed in the groove outer wall 45 and the groove inner wall 46 of the side frame 26, and the engagement rib 53 can be formed in the opening restricting tool 52, the connecting frame portion 74, and the opening restricting portion 75. A form in which the opening restriction part 75 is provided only at one end of the corner frame 27 in the circumferential direction of the window openings 13 and 14 or a form in which one of the opening restriction part 75 and the opening restriction member 52 is omitted can be adopted.

  The corner frame 27 can be bent at two or more places in the circumferential direction of the window openings 13 and 14, or can be formed into a curved shape such as an arc. Two or more types of corner frames 27 having different shapes may be included in the window frame 16. The engaging claw 81 can be formed in the outer corner piece 60, and the engaging hole 80 can be formed in the inner corner piece 61. The heat insulating door 3 according to the present invention is not limited to the swing door that opens and closes the front opening, and can also be used as a swing door that opens and closes the upper surface opening, a slide door, and the like. The application target of 3 is not limited to the refrigerator.

DESCRIPTION OF SYMBOLS 3 Heat insulation door 5 Viewing window 11 Exterior plate 12 Interior plate 13 Window opening 14 of exterior plate Window opening 16 of interior plate Window frame 18 Heat insulating material 22 Transparent plate (glass plate)
26 Side frame 27 Corner frame 28 Assembly groove 32 Outer frame part 33 Inner frame part 34 Hinge part 35 Outer engagement groove 44 Groove bottom wall 45 Groove outer wall 46 Groove inner wall 52 Opening restriction tool 60 Outer corner piece 61 Inner corner piece 74 Connection frame portion 80 Engagement hole 81 Engagement claw

Claims (5)

A heat insulating door comprising an exterior plate (11) and an interior plate (12), a heat insulating material (18) filled between both plates (11, 12), and a viewing window (5),
The viewing window (5) is supported by the window frame (16) and the window frame (16) attached to the periphery of the window openings (13, 14) opened in the exterior plate (11) and the interior plate (12). A transparent plate (22),
The window frame (16) includes a side frame (26) mounted on the straight side of the window opening (13, 14) and a corner frame (27) mounted on the corner of the window opening (13, 14). Including
The side frame (26) is provided with an assembly groove (28) for fitting and engaging the straight side of the transparent plate (22).
The corner frame (27) is composed of an outer corner piece (60) and an inner corner piece (61) that sandwich the corner of the transparent plate (22) from inside and outside,
The side frame (26) is divided in two by a hinge part (34) provided at the groove bottom of the assembly groove (28), and the outer frame part (32) outside the hinge part (34) and the hinge part (34). ) And an inner frame part (33) on the inner side,
The outer frame portion (32) is provided with an outer engagement groove (35) into which the linear side portion of the window opening (13) of the exterior plate (11) is fitted and engaged,
Tilt operation of the inner frame (33) of the side frame (26) attached to the window opening (13) of the exterior plate (11) in a direction away from the outer frame (32) with the hinge (34) as a center. And the heat insulation door with an inspection window characterized by fitting and attaching the linear side part of a transparent board (22) to an assembly groove (28) by expanding an assembly groove (28). The outer corner piece (60) and the inner corner piece (61) are connected to each other through an engaging hole (80) and an engaging claw (81) that are engaged with each other in an inseparable manner,
The outer corner piece (60), the inner corner piece (61), and the side frame (26) are connected by a connecting structure that fits and engages with each other,
The connecting structure includes a connecting frame portion (74) provided on the outer corner piece (60) and the inner corner piece (61) side, and an end portion of the side frame (26) that is fitted on the connecting frame portion (74). The engagement recess (82) and the engagement rib (53) which are provided in a fitting portion between the connection frame portion (74) and the side frame (26) and engage with each other are provided in claim 1. Insulated door with viewing window as described.   The window frame (16) attached to the window openings (13, 14) also serves as a damming body that prevents the heat insulating material (18) filled between the exterior plate (11) and the interior plate (12) from protruding. The heat-insulating door with a viewing window according to claim 1 or 2. Sealed on the side frame (26) on the surface wall of the exterior plate (11) and the interior plate (12) on the side of the filling space (17) and the assembly groove (28). A sealing portion (49) that is in close contact with the transparent plate (22),
The seal body (36, 38), the seal portion (49), and the hinge portion (34) are integrally formed with the outer frame portion (32) and the inner frame portion (33) by a profile extrusion molding method. A heat insulating door with a viewing window according to any one of items 1 to 3. An assembly groove (28) of the side frame (26) includes a groove bottom wall (44) including a hinge part (34), a groove outer wall (45) continuous with the groove bottom wall (44), and a groove inner wall (46). And is formed in a U-shaped cross section,
An opening restricting tool (52) that is fitted on each wall (44 to 46) forming the assembling groove (28) and restricts the assembling groove (28) from expanding and deforming is provided on the side frame (26). The heat insulation door with a sight window as described in any one of Claim 1 to 4 with which it was mounted | worn.

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