Abstract:
It is an object of the present invention to provide a cover panel for keeping a display panel diagonally. A cover panel is employed by an information-indicating means, for example a paper folder, a paper binder, a book with a hard cover and an electronic display. The cover panel is connected to a display panel with a main joint portion. The cover panel is divided into an upper portion and a lower portion by a sub joint portion. When cover panel is opened, the swung lower portion extends on a desk top. In another case, the lower portion and the sub joint portion is abbreviated.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention is related to a cover panel for keeping a display panel diagonally, and more particularly to a cover panel serving as a panel stand. 
         [0003]    2. Description of the Related Art 
         [0004]    It is suitable for a paper, a book or an electronic display to keep a display surface diagonally. The book includes a novel, a picture book and a cooking book. Generally, a paper stand or a book stand is used for keeping a paper or a book diagonally. For example, U.S. Pat. No. 4,555,128 proposes a paper stand. However, prior paper stands are inconvenient for handling and carrying, and they occupy a desk top. 
       CITATION LIST 
     Patent Literature 
       [0000]    
       
         [PTL 1] U.S. Pat. No. 4,555,128 
       
     
       SUMMARY OF THE INVENTION 
       [0006]    It is an object of the present invention to provide a cover panel for keeping a display panel diagonally. It is another object of the present invention to provide a handy stand consisting of a cover panel. The cover panel of the invention can be employed by an information panel, for example a paper folder, a paper binder, a book. Further, a smart phone and a tablet computer with an electronic display can employ the cover panel of the invention. 
         [0007]    A cover panel of the present invention is connected (engaged) to a display panel with a main joint portion. The cover panel for protecting a display surface of the display panel is swung around the main joint portion for viewing. The cover panel is divided into an upper portion and a lower portion. They are connected (engaged) to each other by a sub joint portion. The lower portion is swung, when the display panel is mounted on a desk top diagonally. It is suitable that the upper portion extends in a right angle for the display panel. 
         [0008]    The lower portion of the cover panel extends along the desk top, when the display panel is standing on the desk top diagonally. The lower portion of the cover panel can be abbreviated, if incomplete protection of the display panel is permitted. The cover panel for covering and protecting the display panel can support the display panel standing on the desk top diagonally. A user does not need to handle or carry a traditional stand in order to keep a diagonal posture of the display panel. 
         [0009]    According to a preferred embodiment, the cover panel has a second sub joint portion extending in parallel to the main joint portion extending straightly between the cover panel and the display panel. The cover panel is divided into four pieces connected (engaged) to each other by two sub joint portions. Accordingly, the display panel can have two diagonal postures. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]      FIG. 1  is a schematic perspective view of a standing paper folder with a back cover (a back panel) and a front cover (a cover panel). 
           [0011]      FIG. 2  is an elevation showing the opened shape of the paper folder. 
           [0012]      FIG. 3  is a plan view showing the opened paper folder shown in  FIG. 2 . 
           [0013]      FIG. 4  is a plan view showing the standing paper folder shown in  FIG. 1 . 
           [0014]      FIG. 5  is an elevation showing the closed shape of the paper folder. 
           [0015]      FIG. 6  is a side view showing the standing paper folder shown in  FIG. 1 . 
           [0016]      FIG. 7  is an elevation showing the standing paper folder shown in  FIG. 1 . 
           [0017]      FIG. 8  is a schematic elevation showing the opened shape of a book with a hard cover including a rigid back cover and a rigid front cover. 
           [0018]      FIG. 9  is a schematic elevation showing the opened shape of another paper folder having rigid back cover and rigid front cover. 
           [0019]      FIG. 10  is a schematic elevation showing the opened shape of another paper folder with a paper. 
           [0020]      FIG. 11  is a schematic elevation showing the opened shape of the paper-less paper folder shown in  FIG. 10 . 
           [0021]      FIG. 12  is a schematic elevation showing the opened shape of a handy computer of tablet type. 
           [0022]      FIG. 13  is a side view showing the handy computer shown in  FIG. 12 . 
           [0023]      FIG. 14  is a perspective view showing another paper folder. 
           [0024]      FIG. 15  is an elevation showing the standing posture of the paper folder shown in  FIG. 14 . 
       
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     First Embodiment 
       [0025]    The first embodiment is explained referring to  FIGS. 1-7 .  FIG. 1  is a perspective view of a standing paper folder with a back cover (display panel)  1  and a front cover (cover panel)  2 .  FIG. 2  is an elevation showing opened shape of the paper folder.  FIG. 3  is a plan view showing the opened paper folder shown in  FIG. 2 .  FIG. 4  is a plan view showing the standing paper folder shown in  FIG. 1 .  FIG. 5  is an elevation showing closed shape of the paper folder.  FIG. 6  is a side view showing the standing paper folder shown in  FIG. 1 .  FIG. 7  is an elevation showing the standing paper folder shown in  FIG. 1 . 
         [0026]    The back cover  1  has a clamp (paper keeper) clamping a paper  4 . The rigid back cover  1  is made with a thick paper board or a plastic plate with predetermined thickness. The clamp  3  fixed on the top portion of back cover  1  has a spring member for the clamping. Clamp  3  is formed with plastic members or metal members. Any type of clamp mechanism can be employed. The paper  4  is mounted on an inner surface  1 C of back cover  1  by clamp  3 . 
         [0027]    The rigid front cover  2  is made with a thick paper board or a plastic plate with predetermined thickness. Front cover  2  has a trapezoid upper portion  21  and a right-angled triangle lower portion  22 , which are separated to each other. When the portions  21  and  22  extend along the same direction, front cover  2  has essentially same shape as the rectangular back cover  1 . 
         [0028]    A lower edge  21 A of upper portion  21  is adjacent to an upper edge  22 A of lower portion  22 . Further, a right edge  21 B of upper portion  21  is adjacent to a left edge  1 B of back cover  1 .  FIG. 1  shows an inner surface  21 C of upper portion  21 , an inner surface  22 C of lower portion  22  and the inner surface  1 C of back cover  1 . A plastic cover sheet  5  (not shown in  FIG. 1 ) is adhered on both of inner surfaces  21 C,  22 C and  1 C and outer surfaces of back cover  1  and front cover  2 . It is capable that the plastic cover sheet  5  is adhered on either one of the inner surfaces  21 C,  22 C and  1 C and the outer surfaces of back cover  1  and front cover  2 . 
         [0029]    The plastic cover sheet  5  forms a main joint portion  51  and a sub joint portion  52 . The main joint portion  51  consists of a linear portion of plastic cover sheet  5 . Main joint portion  51  extending straightly is adjacent to the right edge  21 B of upper portion  21  and the left edge  1 B of back cover  1 . The sub joint portion  52  consists of a linear portion of plastic cover sheet  5  extending diagonally. Sub joint portion  52  is adjacent to the lower edge  21 A of upper portion  21  and the upper edge  22 A of lower portion  22 . 
         [0030]    Upper portion  21  of front cover  2  is capable of swinging (turning) around edges  21 B and  1 A. Similarly, lower portion  22  of front cover  2  is capable of swinging (turning) around edges  21 A and  22 A. In the other words, upper portion  21  is capable of swinging to the direction X-X around a virtual axis  100  extending along main joint portion  51 . Similarly, lower portion  22  is capable of swinging to the direction Y-Y around a virtual axis  200  extending along sub joint portion  52 . After all, plastic cover sheet  5  constitutes two hinges formed along edges  1 B,  21 B,  21 A and  22 A. After all, back cover  1 , upper portion  21  and lower portion  22  are adhesively engaged with plastic cover sheet  5 . Any hinge mechanism can be employed instead of plastic cover sheet  5 . 
         [0031]    In  FIG. 1 , a lower edge  1 D of back cover  1  is on a flat desk top  6 . The outer surface of lower portion  22  is on the flat desk top  6 . An angle between upper portion  21  of front panel  2  and back cover  1  is about 90 degrees. An angle between upper portion  21  and lower portion  22  is about 90 degrees. Consequently, the paper folder stands on flat desk top  6  diagonally. Paper  4  extends diagonally on back panel  1 . It is capable to employ a spine between two edges  1 B and  21 B. The spine can be formed from plastic cover sheet  5 , if plastic cover sheet  5  has a predetermined linear gap between adjacent two edges  1 B and  21 B. 
       Second Embodiment 
       [0032]    The second embodiment is explained referring to  FIG. 8 .  FIG. 8  is a schematic elevation showing an opened book with a hard cover including a back cover  1  and a front cover  2 . The book has many paper sheets  7 . Structure of the rigid back cover  1  and the rigid front cover  2  has essentially same shape as back cover  1  and front cover  2  of the paper folder shown in  FIGS. 1-7 . 
       Third Embodiment 
       [0033]    The third embodiment is explained referring to  FIG. 9 .  FIG. 9  is a schematic elevation showing another example of opened paper folder with rigid back cover  1  and rigid front cover  2 . The paper folder shown in  FIG. 9  is essentially same as the paper folder shown in  FIGS. 1-7 . However, the paper folder shown in  FIG. 9  does not have the lower portion  22  and the sub joint portion  52 . 
         [0034]    Instead of the lower portion  22 , the paper folder shown in  FIG. 9  has a belt-shaped paper-keeping portion (paper keeper) made of a thick paper board. The paper-keeping portion  8  is fixed on a lower portion of inner surface  1 C of back cover  1 . A lower edge  8 C of paper-keeping portion  8  is adhered to the lower edge  1 D of back cover  1 . Further, one or both of side edges  8 A and  8 B of paper-keeping portion  8  is adhered to one or both of side edges of back cover  1 . 
         [0035]    An upper edge  8 D of paper-keeping portion  8  is not adhered to inner surface  1 C of back cover  1 . Paper  4  is inserted in a pocket formed between paper-keeping portion  8  and back cover  1 . Upper portion  21  of front cover  2  is not overlying paper-keeping portion  8 . Accordingly, the paper folder has an essentially constant thickness by means of abbreviating the lower portion  22 . Front cover  2  has a lower edge  21 A extending diagonally. An inner side edge  21 X of front cover  2  is longer than an outer side edge  21 Y of front cover  2 . 
       Fourth Embodiment 
       [0036]    The fourth embodiment is explained referring to  FIGS. 10 and 11 .  FIGS. 10 and 11  are schematic elevations showing another example of an opened paper folder. The paper folder shown in  FIG. 10  holds paper  4 , but the paper folder shown in  FIG. 11  does not hold paper  4 . The paper folder shown in  FIGS. 10 and 11  has a paper-keeping portion (paper keeper)  1   e  made of back cover  1 . The paper-keeping portion  1   e  is formed by means of forming a U-character-shaped trench  1   f  at a lower portion of back cover  1 . As shown in  FIG. 10 , a lower portion of paper  4  is inserted into the U-character-shaped trench if. Accordingly, paper  4  is mounted by back cover  1 . 
       Fifth Embodiment 
       [0037]    The fifth embodiment is explained referring to  FIGS. 12 and 13 .  FIG. 12  is a schematic elevation showing an opened handy computer  10  of tablet type.  FIG. 13  shows tablet computer  10  standing diagonally. The tablet computer  10  has a flat display  11 . Front cover (cover panel)  2  further has a second sub joint portion  53  extending in parallel to main joint portion  51 . 
         [0038]    Accordingly, the second sub joint portion  53  divides upper portion  21  into an inner portion  21 A and an outer portion  21 B. Furthermore, the second sub joint portion  53  divides lower portion  22  into an inner portion  22 A and an outer portion  22 B. The outer portions  21 B and  22 B are capable of swinging together to the direction Z-Z around a virtual axis  300  extending along the second sub joint portion  53 . Tablet computer  10  has a lengthwise posture, when lower portions  22 A and  22 B are swung. 
       Sixth Embodiment 
       [0039]    The sixth embodiment is explained referring to  FIGS. 14 and 15 .  FIG. 14  is a perspective view showing another paper folder.  FIG. 15  is an elevation showing a standing posture of the paper folder. In  FIG. 14 , the paper folder is partially opened. In  FIG. 15 , the paper folder is completely opened. 
         [0040]    The rigid paper folder has back cover  1 , front cover  2  and central cover  9 , which have essentially same sizes each. Except the central cover  9 , the paper folder shown in  FIGS. 14 and 15  are same as the paper folder shown in  FIGS. 1-7 . The central cover  9  is added between front cover (cover panel)  2  and back cover (display panel)  1 . Central cover  9  has a second display surface. Accordingly, the paper folder can have the wide display surface.