Abstract:
A casing has a gel layer attached to an outside thereof and a surface layer is attached to the gel layer. The surface layer is made of non-sticky and soft material. The shape of the casing will not be changed because the gel layer and the surface layer are a thin layer which does not change the shape of the casing.

Description:
FIELD OF THE INVENTION  
         [0001]    The present invention relates to a shock absorbing device on a casing of a cellular phones or other sophisticate products such that the device absorbs shocks to protect the parts in the casing.  
         BACKGROUND OF THE INVENTION  
         [0002]    Some sophisticate products such as cellular phones or notebook computers have expensive parts in the casing and these parts should be strictly protected from impacts because the connection between parts are so tiny and could be broken when receiving an impact. That is the reason why the manufacturers recommend the customers to put the products in a glove. However, the glove for receiving the product therein so that people cannot see the products. Most of the users who want show their cellular phones which usually have unique shapes and decorations so that it is important to develop a casing of the product that has anti-shock feature while the shape of the casing is maintained.  
         SUMMARY OF THE INVENTION  
         [0003]    In accordance with one aspect of the present invention, there is provided a casing that has a gel layer attached on an outside of the casing and a surface layer is attached on the gel layer.  
           [0004]    The primary object of the present invention is to provide a shock absorbing layer attached on the casing so as that the parts in the casing can be properly protected from impacts.  
           [0005]    The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, preferred embodiments in accordance with the present invention. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0006]    [0006]FIG. 1 is a perspective view to show a conventional casing of a cellular phone;  
         [0007]    [0007]FIG. 2 is an end cross sectional view to show the two parts composing the conventional casing as shown in FIG. 1;  
         [0008]    [0008]FIG. 3 is side cross sectional view to show the two parts composing the conventional casing as shown in FIG. 1;  
         [0009]    [0009]FIG. 4 is side cross sectional view to show the casing having a shock absorbing layer of the present invention;  
         [0010]    [0010]FIG. 5 is an enlarged view to show the shock absorbing layer of the present invention and the casing;  
         [0011]    [0011]FIG. 6 is an illustrative view to show the work station for attaching the shock absorbing layer on the casing;  
         [0012]    [0012]FIG. 7 shows that molds are engaged with the first part of the casing and the material of the shock absorbing layer is not yet poured in the molds;  
         [0013]    [0013]FIG. 8 shows that the material of the shock absorbing layer is poured in the molds and attached on the first part of the casing;  
         [0014]    [0014]FIG. 9 is a cross sectional view to show the first part of the casing is attached with the shock absorbing layer;  
         [0015]    [0015]FIG. 10 is an enlarged view to show the shock absorbing layer on the first part of the casing;  
         [0016]    [0016]FIG. 11 shows that molds are engaged with the second part of the casing and the material of the shock absorbing layer is not yet poured in the molds;  
         [0017]    [0017]FIG. 12 shows that the material of the shock absorbing layer is poured in the molds and attached on the second part of the casing;  
         [0018]    [0018]FIG. 13 is a cross sectional view to show the second part of the casing is attached with the shock absorbing layer;  
         [0019]    [0019]FIG. 14 is an enlarged view to show the shock absorbing layer on the second part of the casing;  
         [0020]    [0020]FIG. 15 shows the shock absorbing layer is attached on a PDA;  
         [0021]    [0021]FIG. 16 is a cross sectional view to show the PDA is attached with the shock absorbing layer, and FIG. 17 is an enlarged view to show the shock absorbing layer on the PDA. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0022]    Referring to FIGS.  1  to  3 , the conventional casing  10  of a cellular phone is composed of a first part  11  and a second part  12  which is matched with the first part  11  by way of snapping or screws. The first part  11  has apertures  110  defined therethrough for receiving buttons (not shown) inserted therein.  
         [0023]    Referring to FIGS. 4 and 5, the shock absorbing layer of the present invention comprises a gel layer  13  and a surface layer  14  attached on the gel layer  13 . The gel layer  13  is made of polyesters or silicon gels mixed with setting agent so that the gel layer  13  is resilient and deformable. The surface layer  14  is made from soft and non-sticky material so that the users feel comfortable when holding the shock absorbing layer. The shock absorbing layer on the first part  11  and/or the second part  12  can be spread at plural positions on the first part  11  and/or the second part  12 , or the first part  11  and/or the second part  12  are coated with the shock absorbing layer. The shock absorbing layer is a thin layer so that it will not change the shape of the casing. The shock absorbing layer can also be attached on the periphery of the casing.  
         [0024]    Referring to FIG. 6, the shock absorbing layer is attached on the casing in the operation station which includes a transfer belt  20  arranged as a circle. There are mold-A  21  which can be matched with or swung away from a mold-B  22  and a mold-C  23 . There are a first matching area  31  for matching the mold-A  21  and the mold-B  22 , an injection area  32 , mold-B  22  swinging area  33 , a second matching area  34  for matching the mold-A  21  and the mold-C  23 , minor-injection area  35 , vacuum bubbles removing area  36 , statistic electricity coating area  37  and final product area  38  arranged along the belt  20 . As shown in FIGS. 6 and 7, in the first matching area  31 , the mold-A  21  and the mold-B have two respective cavities  210 ,  220  whose inner periphery are the shape of the first part  11 . The material is injected in the cavities  210 ,  220  via the passage  221  in the mold-B  22  at the injection area  32  so as to obtain the first part  11 .  
         [0025]    The mold-B  22  is separated from the mold-A  21  at the mold-B  22  swinging area  33 . The mold-A  21  and the first part  11  are transferred to the second matching area  34  for matching the mold-A  21  and the mold-C  23 . The mold-C  23  is coated with the surface layer  14  in its inner periphery and then matched with the mold-A  21  as shown in FIG. 8. The mold-C  23  is matched with the first part  11  and a space is defined between a cavity  230  and the first part  11  so that the material is injected in the space at the minor-injection area  35 . Bubbles in the material mixed with polyesters or silicon gels mixed and setting agent can be removed at vacuum bubbles removing area  36  to completely mix the two types of materials. The mixed material is the gel layer  13  which is resilient and deformable so as to absorb shocks. The surface layer  14  in the mold-C  23  is then attached on the gel layer  13  as shown in FIGS. 9 and 10. After the gel layer  13  is obtained, the mold-A  21  and the mold-C  23  are then separated, and the mold-A  21  sends the first part  11  with the gel layer  13  and the surface layer  14  to the statistic electricity coating area  37  to have a protection layer on the surface layer  14 . The product is then pick out from the molds in the final product area  38 . The arrangement of the mold-A  21 , mold-B  22  and mold-C  23  can be adjusted to meet requirements to simplify the processes of manufacturing.  
         [0026]    Similarly, referring to FIGS. 11, 12,  13  and  14  and using the processes described above, the second part  12  may have the gel layer  13  and the surface layer  14 . FIGS. 15, 16 and  17  show that the shock absorbing layer can be used on a PDA.  
         [0027]    While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.