Abstract:
An insulation box includes: a case body with a receiving space and an opening, and a door board for covering the opening; wherein the door board includes stacked inner and outer boards, and springs are disposed therebetween to provide buffering and tightening effects. When the opening is covered by the door board for a signal test, the inner board can be properly adjusted to completely seal up the opening of the insulation box, thereby preventing signals from being lost.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    This invention relates to insulation environments, and, more particularly, to an insulation box. 
         [0003]    2. Description of Related Art 
         [0004]    In the flourishing modem electronic industry, electronic products are developed in the trend of miniaturization with powerful features such as high performance, more functions, and high speed. All general electronic products need a specification test, i.e., electromagnetic interference test, to enable the electronic products meet the criteria of related specifications. The electronic products will be put inside an insulation environment for the testing process, and the insulation environment can be an insulation room or an insulation box. 
         [0005]    Please refer to  FIG. 1 , which illustrates an insulation box  1  for a testing process according to the prior art. The insulation box  1  comprises a case body  12  with an opening  120 , a door board  13  for opening/closing the opening  120 , an insulation board  14  disposed on the door board  13 , a latch  15  for connecting the door board  13  and the case body  12 , and hinges  16 . Inner walls of the case body  12  consist of insulation material, the door board  13  has a looped raised bar  130 , while the case body  12  has a corresponding looped groove  121  for he raised bar  130  to wedge therein. In addition, the insulation board  14  is loosely matched with inner wall around the opening  120 , and the latch  15  is a manual latch mostly made out of steel. 
         [0006]    However, when opening the door board  13 , the latch  15  must be manually operated. Consequently, the latch  15  is easily getting weary and loose after frequent usage, thereby the raised bar  130  of the door board  13  cannot wedge tightly in the groove  121  of the case body  12 , and further leading to weaken the insulation effect and causing the testing signals to be let out easily through the area around the opening  120  and the latch  15 . 
         [0007]    Furthermore, each hinge  16  used in the prior insulation box  1  consists of two asymmetric side-by-side steel leaves  160  fixed to the case body  12  and the door board  13  separately, the door board  13  can be opened and closed through the work of a pivot axle  161 . Since the two asymmetric steel leaves are disposed side-by-side, after frequent use for opening/closing the door board  13 , the two steel leaves  160  are getting deformed and loose easily; consequently, the door board  13  cannot seal up the case body  12  well, accordingly the insulation box  1  will be poorly sealed, thereby causing signals to lose through the area around the opening  120 . 
         [0008]    Hence, it is a highly urgent technique issue in the industry how to solve the problem of “being unable to keep the door board sealing up the case body” as happened in the prior art. 
       SUMMARY OF THE INVENTION 
       [0009]    In view of the drawbacks of the prior art mentioned above, it is therefore an objective of this invention to provide an insulation box, mainly improving the door board in the prior art; and no matter in what state the latch or hinges are, being capable of avoiding problem of losing signals due to poor airtightness of the insulation box. 
         [0010]    The door board of the present invention can be closely hinged to one side of the case body for closing up the opening, also the door board consists of an inner board disposed inwardly, an outer board disposed outwardly, and springs disposed between the inner and outer boards for maintaining the elastic yaw allowance for the inner board. 
         [0011]    The insulation box of the present invention comprises a door board that is a double-stacked board body (the inner and outer board), thus providing a double insulation effect to prevent signals from being let out. 
         [0012]    Furthermore, the springs provide the inner board with elastic yaw allowance. Therefore, the space between the inner and outer boards has buffering and tightening effect; after the door board covers the opening, the position of the inner board can be properly adjusted to enable the inner board to seal up the opening, and thus the door board of double-stacked board body (the inner and outer boards) can seal up the insulation box efficiently; thereby avoiding problem of losing signals due to poor airtightness happened between the inner and the outer boards. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0013]    The invention can be more fully understood by reading the following detailed description of the preferred embodiments, with reference made to the accompanying drawings, wherein: 
           [0014]      FIG. 1  is a 3-D diagram showing an insulation box according to the prior art; 
           [0015]      FIG. 2A  is a 3-D diagram showing an opened insulation box according to the present invention; 
           [0016]      FIG. 2B  is an analytical 3-D diagram showing a door board of an insulation box according to the present invention; 
           [0017]      FIG. 2C  is a partial sectional diagram depicting the door board of an insulation box according to the present invention; 
           [0018]      FIG. 3A  is a 3-D diagram depicting a closed insulation box according to the present invention; 
           [0019]      FIG. 3B  is a partial close-up 3-D diagram depicting a latch of a insulation box according to the present invention; and 
           [0020]      FIG. 3C  is a 3-D diagram depicting a hinge of an insulation box according to the present invention. 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0021]    The following illustrative embodiments are provided to illustrate the disclosure of the present invention; those in the art can apparently understand these and other advantages and effects after reading the disclosure of this specification. The present invention can also be performed or applied by other different embodiments. The details of the specification may be on the basis of different points and applications, and numerous modifications and variations can be devised without departing from the spirit of the present invention. 
         [0022]    Please refer to  FIGS. 2A through 2C , which are diagrams depicting an insulation box according the present invention, providing an insulation environment for accurately testing objects. In the present embodiment, the insulation environment is for insulation signals in the process of testing electronic products. 
         [0023]    As shown in  FIG. 2A , the insulation box comprises a case body  2  with an opening  20 , a door board  3  for sealing up the opening  20 , and an insulation board  4  disposed on the door board  3  facing the opening  20 . 
         [0024]    The case body  2  comprises a rectangular bottom board  21  and four rectangular side boards  22  vertically disposed on four sides of the bottom board  21 , and thus a receiving space S is formed therewithin. The opening  20  connects the receiving space S and external environment. An insulation material is disposed on inner surface  22   a  of each of the side boards  22 . 
         [0025]    The door board  3  can be closely hinged to one side of the case body  2  for closing up the opening  20 . As shown in  FIGS. 2B and 2C , the door board  3  comprises a rectangular outer board  31 , a rectangular inner board  32  stacked on the outer board  31 , four sets of connecting elements  30  for connecting the inner board  32  and the outer board  31  at the four corners, and four springs  33  disposed between the outer board  31  and the inner board  32 . The springs  33  are allocated at the four corners of the door board  3 , enabling the outer board  31  and the inner board  32  to keep a homogeneous distance D to each other. The design of the inner board  32  and the outer board  31  in the insulation box provides the door board  3  with a double insulation effect to prevent signals from being let out. 
         [0026]    In an embodiment of the present invention, only one spring  33  may be disposed between the outer board  31  and the inner board  32 . 
         [0027]    The area of the outer board  31  is larger than the area of the inner board  32 , and the area of the inner board  32  is larger than the area of the opening  20 , thereby enabling both the outer board  31  and the inner board  32  to be capable of covering the receiving space S. 
         [0028]    Furthermore, when the door board  3  is laid down to cover from one side of the case body  2 , the outer board  31  and the inner board  32  become interlocked with the case body  2  and cover the opening  20 . As shown in  FIG. 2A , the outer board  31  comprises a looped raised bar  310 , and the case body  2  comprises a looped groove  23  around the opening  20  for the raised bar  310  to wedge therein. The inner board  32  comprises a looped first stair  320 , and the case body  2  comprises a second stair  24  around the opening  20  for the first stair  320  to wedge therein. 
         [0029]    In addition, the connecting element  30  is a T-shaped element, namely, the traverse part thereof is fixed onto the outer board  31  while the vertical part thereof is fixed onto the inner board  32 . In the present embodiment, the connecting element  30  comprises a fixing sheet  301  and a cylinder  300  that is axially disposed on the fixing sheet  301 , the fixing sheet  301  is fixed to the outer board  302  via screws  302 , and one end of the cylinder  300  is a cap  300   a  for embedding inside the outer board  31  while the other end of the cylinder  300  is riveted to a via hole  321  of the inner board  32 , thereby enabling the cylinder  300  to be exposed between the inner board  32  and the outer board  31 , and maintaining a preset distance (namely, distance D) between the inner board  32  and the outer board  31 . As shown in  FIGS. 2B and 2C , the outer board  31  comprises a first notch  311  at each corner for fixing the fixing sheet  301  thereon and second notches  312  disposed at bottom of the first notch  311  (as shown in  FIG. 2C , not penetrating the outer board  31 ), the second notch  312  is for disposing the cap  300   a,  also the fixing sheet  301  covers the second notch  312 , thereby the cap  300   a  is embedded in the outer board  31 . 
         [0030]    In addition, the springs  33  are for maintaining the elastic yaw allowance for the inner board  32 . When assembling the springs  33 , first disposing each spring  33  in a third notch  313  of the outer board  31 . Subsequently, when using the connecting element  30  to connect the inner board  32  and the outer board  31 , the inner board  32  will push down the springs  33 , and thus the springs  33  are allocated between the outer board  31  and the inner board  32 . As shown in  FIG. 2A , when the door board  3  is in an opening state, pushing the inner board  32  toward the outer board  31  direction P, and the inner board  32  will rebound by the springs  33 . 
         [0031]    The insulation board  4  is disposed on the inner board  32 , and the inner board  32  is located between the insulation board  4  and the outer board  31 . Also, the area of the inner board  32  is larger than the area of the insulation board  4 , as shown in  FIG. 2A . In the present embodiment, the insulation board  4  is loosely matched with the inner surfaces  22   a  of the side boards  22  around the opening  20 . 
         [0032]    The insulation box of the present invention applies the springs  33  for the inner board  32  to perform elastic yaw, providing buffering and tightening effect between the outer board  31  and the inner board  32 . After the door board  3  is laid down to cover the opening  20 , the raised bar  310  of the outer board  31  wedges in the grooves  23  around the opening  20 , and the springs  33  help adjusting the inner board  32  to a proper position (displacing in a direction from the outer board  31  to the opening  20 , namely, from up to down). Consequently, the first stair  320  of the inner board  32  wedges in the second stair  24  of the case body  2 , enabling the inner board  32  to seal up the opening  20 , and avoiding the problem of losing signals caused due to poor airtightness between the outer board  31  and the inner board  32 . 
         [0033]    If the first stair  320  of the inner board  32  cannot efficiently wedge in the second stair  24  of the case body  2  due to getting worn out or other factors, a preset length of the cylinder  300  enables the inner board  32  and the outer board  31  to maintain a preset distance, and the springs  33  drive the inner board  32  to displace to a proper position for sealing up the opening  20 . 
         [0034]    Furthermore, the second notches  312  do not penetrate the outer board  31 , thereby avoiding signals from escaping via the second notches  312  in the testing process. 
         [0035]    Moreover, a distance D between the outer board  31  and the inner board  32  provides the inner board  32  with displacement in opposition to outer board  31  (as displacement direction L shown in  FIG. 2C ). Therefore, a depth d of the second notch  312  is greater than a height h of the cap for reserving a space for displacement. 
         [0036]    Additionally, the cylinder  300  can also be elastic, allowing the depth of the second notch is same as the height of the cap, without needing a space for displacement. 
         [0037]    Please refer to  FIGS. 3A through 3C , the insulation box further comprises a latch  5  and hinges  6  for connecting the door board  3  and the case body  2 . As shown in  FIGS. 3A and 3B , the latch  5  is a pneumatic latch, which is made of durable reinforced plastics and is disposed on the outer board  31  and one of the side boards  22 , and an air tube  7  is connected with an air cylinder (not shown in the FIG) for controlling a tenon  50  of the latch  5  to wedge in or separate from a mortise  51  on the case body  2 , thereby enabling the door board  3  to be fixed to or released from the case body  2 . As indicated by the dotted line in  FIG. 3A , the tenon  50  is wedged in the mortise  51 , thereby having the door board  3  fixed to the case body  2 . Since the tenon  50  is controlled by pneumatic means, even after many times of use of the door board  3 , the tenon  50  is not easily to worn out or get loose. Consequently, the door board  3  and the case body  2  can maintain well-sealed, thereby avoiding problem of losing signals from around the opening  20  and the latch  5  due to poor airtightness of the insulation box. 
         [0038]    As shown in  FIGS. 3A and 3C , each of the said hinges has two symmetrical side-by-side steel leaves  60  separately fixed to the side board  22  and the outer board  31 , and a pivot  61  axially connecting the two steel leaves. The door board  3  is pivoted to the case body  2  through the hinges, thereby enabling the door board  3  to be operated to open or close the case body  2 . Also, the symmetrical side-by-side design of the two steel leaves  60  provides benefit of maintaining the two steel leaves  60  in good shape as well as well-fixed, therefore the door board  3  and the case body  2  can keep airtight closeness, and further avoiding problem of losing signal around the opening  20  due to poor airtightness of the insulation box. 
         [0039]    In view of the above, the insulation box of the present invention, mainly providing the double-layered door board having an inner and an outer boards, and further by applying the springs to provide the inner board with buffering and tightening effect; therefore, when using the door board to seal up the insulation box, capable of efficiently avoiding problem of losing signal due to poor airtightness of the insulation box in no matter what state the latch or hinges are. 
         [0040]    The invention has been described using exemplary preferred embodiments. However, it is to be understood that the scope of the invention is not limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications and similar arrangements. The scope of the claims, therefore, should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.