1. Field of the Invention
The present invention relates to a thermally insulated housing for configuring the body of a cooling storage unit and the like, and a manufacturing method thereof.
2. Description of the Prior Art
There is a known example of a thermally insulated housing for configuring the body of a refrigerator described in Japanese Laid-Open Patent No. 6-300429. This example has an outer shell constituted by including an inner case housed at a predetermined interval within an outer case. Assembling multiple panels together forms the cases. The outer shell is then completed by charging foam insulation between the inner and outer cases in the state of having the cases set in a foaming jig.
In the situation of a large-size refrigerator for business or professional use, for example, the back surface in particular of the outer case may have a relatively large surface area. Therefore, there is a known refrigerator having a back surface formed by joining two panels together via mutually overlapping edges. As for a method of sealing the joint between both of the panels, a sponge is sandwiched between the overlapping edges of the panels and the assembly is riveted at appropriate intervals.
However, according to this conventional method, the work is troublesome because it is necessary to affix the sponge and to further rivet the assembly. In addition, the sponge may not be sufficiently compressed at locations distant from a riveted position. Therefore, there is a possibility of absorbing the liquid foaming agent when the foam is charged. This could have the opposite effect of widening the gap between the joint due to secondary foaming and the like.
A thermally insulated housing of the present invention may be manufactured as follows. With regard to the foaming process, an outer shell having an inner case, housed at a predetermined spacing interval within an outer case, is set within a foaming jig. The outer shell is in a state of having the foaming jig in contact with portions of the outer shell, particularly with an outer surface of the outer case and an inner surface of the inner case. Foam liquid is then injected between the outer case and the inner case while the outer shell is in this state. In this situation, on the surface (s) of the outer case and/or the inner case having multiple panels joined thereon, an overlapping edge of a front side panel of the adjacent panels is pressed against the corresponding overlapping edge of a backside panel. Spacers interact with the surface (s) so as to constitute a state of having both of the overlapping edges in close contact with each other while possibly deforming via bending. As a result, this inhibits the foam liquid from leaking through the overlapping joint. Thereafter, foam insulation is foamed in between the inner and the outer cases. However, as both of the overlapping edges are pressed by the foaming jig, they acquire a closer contact with one another while bending further under the pressure of the foam. Consequently, the sealing properties are secured for the overlapping joint of the panels during and after the manufacturing of the thermally insulated housing.
To be more specific, it is possible to secure the sealing properties of the joint between the panels without using any particular sealant or any additional fasteners such as rivets. This allows the manufacturing of the thermally insulated housing at a relatively low cost.
Hereafter, embodiments of the present invention will be described in detail with reference to the attached drawings.
A first embodiment of the present invention will be described by referencing
In
Next, the structure and a manufacturing process for the thermally insulated housing 10 will be described.
In general terms, in order to form the thermally insulated housing 10 of this embodiment an inner case 40 is housed at a predetermined interval within an outer case 20. The cases form an outer shell 15 consisting of a double case with an anterior opening. After the outer shell 15 is set in a foaming jig HJ, foam insulation 45, such as a foaming polyurethane resin, is foamed and charged in between the outer and inner cases 20 and 40.
As shown in
The top panel 21 and bottom panel 22 are planar and have a downward flange 21A and an upward flange 22A formed on their respective posterior edges. The right and left side panels 23 are formed similar to shallow dishes, and their respective anterior edges 23A are bent inward at a right angle. The upper and lower frames 24 are formed similar to boxes, laterally long and thin, and opened on a posterior surface side.
As shown in
The two panels, the left and right back panels 30L and 30R, are positioned to cover the posterior opening 29 of the outer case body 28.
Both of the back panels 30L and 30R are shaped substantially as quadrilateral parallelograms. Their vertical dimension is almost equal to height of the posterior surface of the outer case body 28, while their lateral dimension is longer than half of the frontage area of the posterior surface of the outer case body 28. Therefore, if the back panels 30L and 30R are positioned to fit around the opening edge portion 29A on the posterior surface of the outer case body 28, the right edge of the left back panel 30L overlaps the left edge of the right back panel 30R, according to the predetermined dimensions.
With regard to this embodiment, the left edge of the right back panel 30R can overlap an opposing surface of the right edge of the left back panels 30L. Subsequently, the right edge of the left back panel 30L is referenced as overlapping edge 31, and the left edge of the right back panel 30R is referenced as overlapping edge 32. The overlapping edges 31 and 32 of the left and right back panels 30L and 30R have bends 33 oppositely formed at a blunt angle with the free ends bent towards the opposing left and right back panels 30L and 30R side surfaces.
Rivet holes 35 are formed at appropriate intervals along the peripheries of both of the back panels 30L and 30R, except for the overlapping edges 31 and 32. Corresponding rivet holes 36 are also formed along the opening edge portion 29A on the posterior surface of the outer case body 28.
An example of a manufacturing procedure for the thermally insulated housing 10 will be described next. First, the outer case body 28, having the openings on the anterior and posterior surfaces, is formed as shown in
The overlapping edges 31 and 32 of the back panels 30L and 30R are overlapped in a condition of having the respective bends 33 deformed so as to be almost flat at the upper and lower ends, as shown in
The inner case 40, which is like a box with an anterior opening and is one size smaller than the outer case 20, is housed at a predetermined interval inside of the outer case 20 that is assembled as previously described. As with the outer case 20, multiple panels composed of stainless steel plates are assembled to form the inner case 40. The inner case 40 may also be formed with a solid plate or integrally molded with a synthetic-resin material, depending on the size of the inner case 40.
Spacers 42 are mounted at appropriate intervals between the outer case 20 and the inner case 40 in order to set a predetermined interval between the outer case 20 and the inner case 40. The spacers 42 may be formed of blocks of styrofoam or the like, which is a thermally insulated material, so as to have the appropriate amounts of rigidity and elasticity.
As shown in
Consequently, if the inner case 40, having the spacers 42 affixed thereon, is housed within the outer case 20 and the outer shell 15 is assembled, then the portion of the outer case 20 having the overlapping edges 31 and 32 of the left and right back panels 30L and 30R is put in a state in which, as shown in
The outer shell 15 thus assembled is set in the foaming jig HJ. For the back panel of the outer shell 15 for instance, the foaming jig HJ is placed along the outside of the back surface of the outer case 20, and along the inside of the front surface of the back of the inner case 40. Foam liquid is injected into the outer shell 15, that is, between the outer case 20 and the inner case 40, while in such a state. In this case, as previously described, the portion of the outer case 20 having the two joined back panels 30L and 30R is in a state in which the overlapping edge 31 of the backside back panel 30L is elastically pressed against the overlapping edge 32 of the front side back panel 30R. The foam liquid is received between the spacers 42 so that both of the overlapping edges 31 and 32 are put in close contact while deforming the bends 33. Therefore, there is no leakage of foam liquid from this joint.
The foam insulation 45 is thereafter foamed between the outer case 20 and the inner case 40. However, as the outer case 20 and the inner case 40 are pressed by the foaming jig HJ, the overlapping edges 31 and 32 are urged in closer contact while further deforming both of the bends 33 to be flatter due to the pressure of the foam, as shown in
According to the previously described embodiment, it is possible to prevent the leakage of the foam liquid from the joint between the back panels 30L and 30R with a configuration of forming the back panel of the outer case 20 by joining two back panels 30L and 30R. In addition, the sealing properties of the joint can be secured without using any particular sealant or additional fasteners such as rivets. This allows the manufacturing of the thermally insulated housing 10 at a relatively low cost.
In particular, the manufacturing of the thermally insulated housing 10 is easy to handle because of the structure of simply bending the overlapping edges 31 and 32 of the back panels 30L and 30R at a blunt angle.
A second embodiment of the present invention will be described next by using
According to the second embodiment, the back panel of the outer case 20 is similarly configured by joining left and right back panels 50L and 50R. However, a change is made to the form of the overlapping edges of the back panels 50L and 50R.
As shown in
An overlapping edge 51 of the left (backside) back panel 50L has a small hook portion 53 bent twice forward and leftward, substantially forming a right angle thereon. Likewise, an overlapping edge 52 of the right (front side) back panel 50R has a large hook portion 54 correspondingly one size larger and bent twice forward and leftward, also substantially forming a right angle thereon and allowing the small hook portion 53 to be covered by and fitted therein. As indicated by the chained lines in an enlarged view of
According to the second embodiment, the inner case 40, having the spacers 42 affixed thereon, is housed within the outer case 20, thereby assembling the outer shell 15. Thereafter, the outer shell 15 is set in the foaming jig HJ to have foam liquid injected between the outer case 20 and the inner case 40. However, the portion of the outer case 20 having the two joined back panels 50L and 50R is in the state in which the overlapping edge 51 of the backside back panel 50L is elastically pressing against the overlapping edge 52 of the front side back panel 50R. The spacers 42 interact with the front side back panel 50R so that both the hook portions 53 and 54 are placed in close contact with each other while deforming the bend 55 to a substantially straight orientation. Therefore, the leakage of foam liquid from the joint is inhibited. After setting in the foaming jig HJ, the foam insulation 45 is foamed in between the outer case 20 and the inner case 40. However, as the cases are pressed by the foaming jig HJ, the hook portions 53 and 54 come in closer contact to each other due to the pressure of the foam. Consequently, the sealing properties of the joint formed by the back panels 50L and 50R are secured during the manufacturing of the thermally insulated housing 10.
Since both of the overlapping edges 51 and 52 are in close contact via a hook shape, further improvements are made in the functions of preventing the leakage of the foam liquid at the joint of the back panels 50L and 50R and the sealing of the joint after completion of the thermally insulated housing 10.
According to the third embodiment, the portion of the outer case 20 having two joined back panels 60L and 60R is in a state in which the overlapping edge 61 of the backside back panel 60L is elastically pressing against the overlapping edge 62 of the front side back panel 60R. The front side back panel 60R interacts with the spacers 42 so that the inserted piece 63 is fitted in the insertion groove 64 while at least partially in close contact with a groove surface thereof, and deforming the bend 65 to a substantially straight orientation. Therefore, the leakage of the foam liquid from the joint is inhibited. Thereafter, the foam insulation 45 is foamed in between the outer case 20 and the inner case 40. However, as the cases are pressed by the foaming jig HJ, the inserted piece 63 and the groove surface of the insertion groove 64 come in closer contact with each other due to the pressure of the foam. Thus, the sealing properties of the joint between the back panels 60L and 60R are secured during the manufacturing of the thermally insulated housing 10.
As for the overlapping edges 61 and 62, the inserted piece 63 is fitted into the insertion groove 64 while at least partially in close contact with one another. As a result, a labyrinth structure is configured in addition to the close contact. Therefore, further improvements are made to the functions of preventing the leakage of the foam liquid at the joint of the back panels 60L and 60R and the sealing of the joint after the completion of the thermally insulated housing 10.
The present invention is not limited to the embodiments previously described by using the detailed descriptions and drawings, but may include the following embodiments, for example, within its technical scope. Furthermore, there may also be various embodiments other than the following by modifying the embodiments to an extent that does not deviate from the subject matter thereof.
Number | Date | Country | Kind |
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2005-071285 | Mar 2005 | JP | national |
This application is a divisional application of application Ser. No. 11/372,039, filed Mar. 10, 2006 now U.S. Pat. No.7,971,746.
Number | Name | Date | Kind |
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6112851 | Sugimoto et al. | Sep 2000 | A |
7185509 | Lee et al. | Mar 2007 | B2 |
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Number | Date | Country | |
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20100187711 A1 | Jul 2010 | US |
Number | Date | Country | |
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Parent | 11372039 | Mar 2006 | US |
Child | 12560792 | US |