Abstract:
An adhesive sheet type holding device for mounting onto a wall is provided. The holding device comprises a base and a holder which is made in the shape of an appropriate support and attached to said base. The holding device is characterized in that it comprises an adhesive sheet for air-tightly mounting onto a wall, said sheet is attached to said base, the surface of said sheet extends outwards beyond the edge of said base. The adhesive sheet type holding device according to the invention is mounted onto a wall through the adhesive sheet which contact area with the wall is larger than the area of the back of the base. Good airtight effect is achieved between the sheet and the wall so that the holding device according to the invention can firmly mount onto a wall for long. Further, the adhesive sheet may be transparent or be printed various specific pattern on its surface, so the holding device according to the invention not only can not damage to the wall, but also can form various specific appearance.

Description:
FIELD OF THE INVENTION  
         [0001]    The present invention relates to a holding device, more particularly, to a holding device for mounting onto a wall.  
         DESCRIPTION OF THE RELATED ART  
         [0002]    A holding device for mounting onto a wall is a device mounted onto wall surface for holding or hanging something, such as a coat and hat hook, a soap holder, a bathroom towel rack and the like. The known holding device for mounting onto a wall generally comprises a base and a holder with an appropriate shape of a bracket connected with the base for holding or hanging commodities. The base of the holder of the holding device for a wall has to be securely and durably fixed on a wall in order to hold commodities securely but not to damage and affect the surface of the wall. In the prior art, the base is fixed onto a wall by hammering nails into the wall, adsorbing thereon with suction by an acetabula, or cementing thereon with a sheet having glue at its double faces, hot-melt adhesive and the like. However, the wall surface sometimes would be prone to be damaged if the base is fixed by hammering nails into the wall, the adsorbing force and duration is not ideal due to the limitation of the area and the air tightness of the acetabula if the base is fixed by adsorbing thereon with the acetabula, while the fastness is not satisfactory due to the limitation of the adhesive force if the base is fixed by cementing thereon with a sheet having glue at its double faces or hot-melt adhesive. Another adhesive sheet type holding device is disclosed in the U.S. Pat. No. 5,275,367 in which a PVC adhesive sheet with a large area provided under a base is attached to a wall. Since the contacting area between the device and the wall is increased, the adsorption affinity is increased. A further adhesive sheet type holding device is disclosed in the U.S. Pat. No. 4,842,912 in which the holding device is also attached to a wall through an adhesive sheet with large area Further the adhesive sheet includes an interlayer and the base is disposed between the interlayer and the adhesive sheet. However, the bearing capacity of the holding device is greatly restricted due to the limitation of the adsorption affinity with a wall since the area and the strength of the adhesive sheet is limited.  
         SUMMARY OF THE INVENTION  
         [0003]    It is the object of the present invention to overcome the above disadvantages and to provide an adhesive sheet type holding device for mounting onto a wall which can be securely and durably fixed onto a wall without any damage to the wall.  
           [0004]    In order to prevent the object hung on the holder from falling down, an upward force equal to the weight of the object has to be provided. The air pressure provides a horizontal force, i.e. a normal force which is necessary for a friction force and which presses the base and the adhesive sheet under the base against the wall, so that a static upward friction force is generated between the wall and the adhesive sheet. The upward force to prevent the object against falling down is provided by adhesive and the friction force if the adhesive sheet has adhesive on its back side. As long as the maximal static friction force is equal to the weight of the object, the falling of the object can be prevented. According to the analysis of the forces acting on the device, friction plates are provided by the side of (at the left side, right side, upper side and lower side of) the plate-shaped base to improve the effect of the friction and to increase the friction force.  
           [0005]    In order to achieve the above object, the present invention provides an adhesive sheet type holding device for mounting onto a wall including a base, a holder which is made in the shape of an appropriate support and attached to the base, and an adhesive sheet which has a well air tightness and can be tightly attached on a wall, the adhesive sheet is attached to the base with the surface of the adhesive sheet extended outwards beyond the edge of the base, the device is characterized in that the device further includes a friction plate connected with the base, a material with high coefficient of friction is provided on the surface of the friction plate which is towards the wall.  
           [0006]    The holding device according the present invention is characterized in that at least one friction plate is connected with the base by movable joints and is attached on the front side of the adhesive sheet.  
           [0007]    The holding device according the present invention is characterized in that the friction plate is directly pressed against the wall beyond the area of the adhesive sheet.  
           [0008]    The most important function of the adhesive sheet is to provide air-tight effect. The adhesive sheet may be paper and film provided on the back side thereof with adhesive or fluxible solid (ropy or gelatiniform) filling substance or the adhesive sheet may be a electrostatic paster with no adhesive on the back side thereof and with a highly smooth surface. The electrostatic paster can be used for smooth wall surfaces such as glass, ceramic tile, plastic and baking finish surface, the adhesive sheet with adhesive on its back can be used for the general wall surface, while the adhesive sheet with fluxible solid filling substance on its back can be suitable for the rough surface since the filling substance can fill in the depression on the surface so that the adhesive sheet with fluxible solid filling substance on its back can be tightly mounted on the wall.  
           [0009]    In use, the adhesive sheet is attached onto a wall, and it comes into tight contact with the wall to achieve excellent air-tight effect due to the adhesive on its back or the adsorption affinity of its surface. When the holder bears an object, the force applied to the base causes the adhesive sheet to be detached from the wall and generates a negative pressure clearance between them. The base and the adhesive sheet is pressed against the wall due to the air pressure so that the holding device can be fixed on the wall securely and durably.  
           [0010]    In the adhesive sheet type holding device according to present invention, since at least one friction plate connected with the base is provided. When the holder connected to the base bears an object, since the base connected with the friction plates is movable, in the case that the force is applied to the base and the adhesive sheet connected with the base produces a trend to separate from the wall, the friction plates push or pull the base through the joints so that the desquamating of the base can be prevented from. Therefore, the adhesive force between the adhesive sheet holding device and the wall can be enhanced so that the bearing capacity of the device is improved. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0011]    [0011]FIG. 3 is sectional view showing the lower portion of the adhesive sheet type holding device shown in the FIG. 2 which has been assembled together;  
         [0012]    [0012]FIG. 4 is a perspective view with a local section showing the adhesive sheet type holding device for mounting onto a wall according to the third embodiment of the present invention;  
         [0013]    [0013]FIG. 5 is a schematic view showing the back of the lower friction plate of the adhesive sheet type holding device for mounting onto a wall shown in the FIG. 4;  
         [0014]    [0014]FIG. 6 is an inverse schematic view showing the back of the base and the upper friction plate of the adhesive sheet type holding device for mounting onto a wall shown in the FIG. 4;  
         [0015]    [0015]FIG. 7 is a schematic sectional view showing the adhesive sheet type holding device for mounting onto a wall shown in the FIG. 4;  
         [0016]    [0016]FIG. 8 is a schematic view showing the condition of forces acting on the adhesive sheet type holding device for mounting onto a wall shown in the FIG. 7;  
         [0017]    [0017]FIG. 9 is a schematic exploded view showing the structure of the adhesive sheet type holding device for mounting onto a wall according to the fourth embodiment of the present invention;  
         [0018]    [0018]FIG. 10 is a schematic view with a local section showing the structure of the adhesive sheet type holding device for mounting onto a wall shown in the FIG. 9 which has been assembled together;  
         [0019]    [0019]FIG. 11 is a sectional view along the line A-A in the FIG. 10;  
         [0020]    [0020]FIG. 12 is a sectional view along the line B-B in the FIG. 11;  
         [0021]    [0021]FIG. 13 is a schematic exploded view showing the structure of the adhesive sheet type holding device for mounting onto a wall according to the fifth embodiment of the present invention;  
         [0022]    [0022]FIG. 14 is a schematic view with a local section showing the structure of the adhesive sheet type holding device for mounting onto a wall shown in the FIG. 13 which has been assembled together;  
         [0023]    [0023]FIG. 15 is a sectional view along the line C-C in the FIG. 14;  
         [0024]    [0024]FIG. 16 is a schematic view showing the structure of the adhesive sheet type holding device for mounting onto a wall according to the sixth embodiment of the present invention. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0025]    In the third embodiment of the present invention, the friction plate is connected with the base through the movable joints and is attached on the front surface of the adhesive sheet.  
         [0026]    The above joints may be a bendable hinge or an appropriate cam structure. When the cam structure is used for the joints, it can cause the base and friction plates to laterally move with respect to each other when the base moves towards the friction plates, so that the base and the adhesive sheet connected with the base is lifted up and separated from the wall surface, but the friction plate is maintained to be tightly attached to the wall. The cam structure may be slope structure or an inclined pushing piece mechanism or the like.  
         [0027]    The cam should be provided at the middle position of the junction of the base and the friction plates, so that when the cam acts, the force applied by it is focused on the center position. As a result, the middle portion of the base adjacent to the friction plates uplifts higher than the other portions, while the margin portion is more adjacent to the wall, so that the adhesive sheet of the margin of the base is only slightly pulled upwards and has less possibility to rupture.  
         [0028]    In order to better be attached to the curved surface, the base can be divided into a plurality of sub-bases which are connected with one another by movable joints.  
         [0029]    In the third embodiment of the present invention, as shown in the FIGS.  4 - 6 , an adhesive sheet type holding device for mounting onto a wall includes an adhesive paper sheet  301 , a base  302  and a holder  303 . The adhesive paper sheet  301  is an electrostatic adhesive paper (i.e. an electrostatic paster) having a square shape. The base  302  having the shape of a plate is stuck on the front side of the adhesive paper sheet  301 . The holder  303  is two side by side hooks which are adjacent to each other and which are connected to the base  302 . The base is provided with an upper friction plate  322  and a lower friction plate  323  attached to the front side of the adhesive paper sheet  301  on its upper portion and its lower portion, respectively. The upper friction plate  322  is connected with the base  302  through a hinge  321  and the lower friction plate  323  is connected with the base via a slope-shaped cam structure  324 . The base  302 , the upper friction plate  322  and the lower friction plate  323  are provided thereon with hinges  320 ,  326  and  325  formed by longitudinal grooves to be bent easily, so that they can achieve a fight attaching to the curved wall surface.  
         [0030]    When the holder  303  bears no load, as shown in the FIG. 7, the base  302  is contacted with the wall surface and the upper slope  3241  has not yet contacted with the lower slope  3242  of the cam structure  324 . When a force is applied to the hooks, the base  302  moves downwards, the upper slope  3241  slides onto the lower slope  3242  along the slope, so that the base  302  and the adhesive paper sheet  301  connected to the base  302  are detached from the wall  304 . A clockwise torque as shown in the FIG. 8 applied to the holder  303  is generated due to the force applied thereto and it causes the upper portion of the base  302  and the adhesive paper sheet  301  attached to the base  302  to be detached from the wall  304 . As a result, the adhesive paper sheet  301  is pulled upwards by a little due to its elasticity, so that negative pressure is generated in the clearance  305  between the adhesive paper sheet  301  and the wall  304 , at the same time, negative pressure is also produced between the adhesive paper sheet  301  beneath the upper friction plate  322  and the lower friction plate  323  and the wall  304 , so that the air pressure presses the friction plates and the adhesive paper sheet  301  beneath the friction plates against the wall  304 . Thus, the resultant static friction force between the adhesive paper sheet  301  and the wall  304  produces an effect preventing the adhesive paper sheet  301  from sliding downwards so as to prevent the base  302  from falling.  
         [0031]    The pressing roller device for ejecting the air between the adhesive paper sheet and the wall can further be provided in the present invention in order to keep well air tightness between the adhesive paper sheet and the wall.  
         [0032]    In the forth embodiment of the present invention, as shown in the FIGS.  9 - 12 , an adhesive sheet type holding device for mounting onto a wall includes an adhesive paper sheet  401 , a base  402 , a friction plate  404 , a rolling ring  441 , a pressing roller  442 , a pressing plate  405 , a peeling piece  413  and a holder  403  (only shown in the FIG. 10). The external surface  411  of the adhesive paper sheet  401  having a round shape is stuck on the surface of the base  402  pressing against the wall and the surface of the friction plate  404  pressing against the wall. In addition, the adhesive paper sheet  401  is provided with adhesive on the internal surface thereof to be stuck on the wall. The base  402  having a round shape is provided with ligaments on the periphery thereof and is connected with the friction plates  404  having the shape of a circular ring. Slopes engaging with each other are provided on the periphery of the base  402  and the internal periphery of the friction plate  404 . When the base  402  moves outwards in any direction and meet with the friction plate  404 , the slope of the base  402  rides on the slope of the friction plate  404  and thus the base  402  is pushed up and detached from the wall, so that the adhesive paper sheet  401  attached to the base  402  follows the latter to depart from the portion of wall. At the portion a negative-pressure clearance is generated between the adhesive paper sheet  401  and the wall and negative pressure is also produced between the wall and the adhesive paper sheet  401  beneath the friction plate  404  adjacent to the portion due to the effect. As a result, the air pressure presses the friction plate  404  against the wall, so that the adhesive paper sheet  401  beneath the friction plate  404  is tightly and securely pressed on the wall since the resultant friction force blocks its falling.  
         [0033]    The base  402  is provided at the center thereof with a groove  424  formed with a hinge  4241  on the lower end thereof. As shown in the FIG. 11, the upper end of the groove  424  closes if no force is applied thereto, and the back side of the base  402 , i.e. a press attaching surface  4211 , is formed with the shape of a protrusion projected towards the wall (downwards). As a result, when the base  402  is pressed and attached onto the wall, the center portion of the base  402  firstly contacts with the wall, so that the air between the adhesive paper sheet  401  and the wall is ejected outwards from the center portion.  
         [0034]    In order to make the lower surface of the base  402  bent and to have a shape projecting downwards from the center thereof, beside the above hinge structure, the press attaching surface  4211  may be formed into a spherical surface projecting downwards, provided thereon with elastic material and a hollow chamber to be planished outwards from the center portion as the above.  
         [0035]    Since it will take long distance for the air to penetrate into the portion beneath the friction plate from the margin of the adhesive paper sheet around the friction plate  404 , it can effectively improve the air-tight effect to press the adhesive paper sheet tightly on the wall.  
         [0036]    In order to be tightly pressed on the wall the adhesive paper sheet around the friction plate  404 , provided around the friction plate  404  is the rolling ring  441  which has a ring shape with its inner ring projecting towards the adhesive paper sheet  401  and which may be made of elastic material such as spring steel sheet. When the rolling ring  441  is pressed onto the wall, the center of the rolling ring  441  firstly presses the adhesive paper sheet  401  against the wall, and continuously pushing the rolling ring  441  causes the inner ring of the rolling ring  441  to be bent upwards and the entire rolling ring  441  gradually turns upwards, so that the adhesive paper sheet  401  is continuously rolled toward the outer periphery thereof from the inner portion by the rolling ring  441  and the air is ejected so as to be pressed tightly on the wall.  
         [0037]    The pressing plate  405  is disposed above the rolling ring  441  and is provided with two long springs having the shape of a arched plate which are capable of pushing the base  402  and two short springs which are capable of pushing the friction plate  404 . A pressing foot  453  in a circular ring shape for pushing the outer edge of the rolling ring  441  is also provided around the pressing plate  405 . Thus, as long as the pressing plate is pushed, the long springs  451  firstly presses the base  402  flatly against the wall, then, the short springs  452  presses the friction plate  404  against the wall, next, the pressing foot  453  pushes the rolling ring  441 , so that the air between the adhesive paper sheet  401  and the wall is continuously squeezed out from the center to the outside of the adhesive paper sheet  401 .  
         [0038]    Since the wall surface may be uneven, a soft cushion  4311  can be provided on the surfaces of the base  402 , the friction plate  404  and the rolling ring which are pressed onto the wall, so that the adhesive paper sheet  401  can be yieldingly pressed onto the wall.  
         [0039]    Since the further portion around the adhesive paper sheet  401  has a large range, if it is designed to press all of the adhesive paper sheet  401 , the rolling ring  441  has to be big, the pressing roller  442  is also disposed on the base  402 . The pressing roller  442  has the shape of a roller and is provided at the axis thereof with a shaft hole  4422  through which a shaft  406  is disposed. One end  461  of the shaft  406  is big enough to prevent the pressing roller  442  from detaching from the shaft  406  and the other end is bent and connected to the circular ring  463 . The circular ring  463  is fitted over a groove  4251  provided on the cylindrical portion  425  of the base  402  projecting upwards, so that the pressing roller  442  can rotate around the base  402 . In order to facilitate the rolling of the pressing roller  442  on the circular road, the rolling body of the pressing roller  442  is formed into an appropriate taper. The pressing roller  442  can be pushed to rotate and pressed by griping a gripe  464  provided on the shaft  406 . It can be seen from the FIG. 10 that the axis of the pressing roller  442  is inclined by an angle with respect to the radius of the base  402 . When the gripe  464  is griped and rotated clockwise, the closer the portion is to the center of the adhesive paper sheet  401 , the more early the portion is pressed, while the farther the portion is from the center of the adhesive paper sheet  401 , the later the portion is pressed. Thus, the air between the adhesive paper sheet and the wall can be squeezed out from the internal side to the external side. The pressing roller  442  is provided with soft material on the rolling surface so that the adhesive paper sheet  401  can be yieldingly pressed onto the wall.  
         [0040]    A peeling piece  413  extending upwards is also provided on edge of the outer surface of the adhesive paper sheet. The edge of the adhesive paper sheet can be pulled and detached from the wall and thus the whole holding device can be removed from the wall by pulling the peeling piece  413  up.  
         [0041]    It has been proved by the test that the effect to prevent the holder from sagging will be better if the friction plate is directly pressed against the wall, instead of the adhesive paper sheet.  
         [0042]    In the fifth embodiment of the present invention, as shown in the FIGS.  13 - 15 , an adhesive sheet type holding device for mounting onto a wall includes an adhesive paper sheet  501 , a base  502 , a friction plate  506 , a rolling ring  541 , a pressing plate  505  and a holder  503  (only shown in the FIG. 14). The structure in the fifth embodiment is similar to that in the forth embodiment except that the friction plate  506  is connected with the base  502  via detachable connecting rods  534  and is directly pressed against the wall  507  beyond the area of the adhesive paper sheet  501 .since some adhesive paper sheet tend to slide on the wall after they have been pressed for a long time, a material with high coefficient of friction such as foamed rubber and cork is provided on the surface of the friction plate  506 . The connecting rods  534  connected with the friction plate are inserted into the corresponding holes in the base and connected with the base, and the adhesive sheet type holding device for mounting onto a wall may be stuck onto the wall before or after the friction plate is assembled on the base during the assembly. The holder  503  may be connected to the base  502  or the connecting rods  534  of the friction plate  506 .  
         [0043]    The rolling ring  541  made of thick and soft materials has a ring shape with its inner ring projecting towards the adhesive paper sheet, like the above structure. Since the rolling ring  541  is thick, the pressing foot does not have to be projected downwards as that in the FIG. 11 and the short springs are no longer used. In use, the base  502  is pressed onto the wall  507  by the pressing plate  505 , the long spring  551  firstly presses the base  502  flatly against the wall, then, the rolling ring  541  is pushed by the pressing plate  505  to be deformed and to gradually contact and press the adhesive paper sheet  501  from the center to the outer periphery thereof Thus, the air between the adhesive paper sheet  501  and the wall  507  is continuously squeezed out from the center to the outer periphery. After that, the friction plate  506  connected with the base  502  by the connecting rods  534  can be directly pressed against the wall  507 .  
         [0044]    It has been proved through the study that the center portion of the adhesive paper sheet tend to be penetrated by the molecules of the air due to the force from the base so that the air penetrates between the adhesive paper sheet and the wall through the base and the adhesive paper sheet. Therefore, the air tightness of the center portion of the adhesive paper sheet should especially be enhanced. In order to achieve a desired air-tight effect, on one hand, the base and the adhesive paper sheet can be made of materials with high gas barrier property, on the other hand, an air barrier layer may be provided on the surface of the center portion of the adhesive paper sheet and it may be metal foil or PVDC of the like.  
         [0045]    In the sixth embodiment of the present invention, as shown in the FIGS.  16 , an adhesive sheet type holding device for mounting onto a wall includes an adhesive paper sheet  601 , a base  602 , a rolling ring  641 , a pressing roller  642 , a pressing plate  605 , a peeling piece  613  and a holder  603 . The structure in the sixth embodiment is similar to that in the forth embodiment except that a piece of aluminum foil  611  is stuck between the base  602  and the adhesive paper sheet  601  and has a area slightly larger than that of the base  602 . Thus, better air-tight effect can be achieved by way of the excellent gas barrier property of the aluminum foil layer. The holder  603  has the shape of a basket ring and is provided on the base  602 . The friction plate  606  is fixed on the side of the basket ring shaped holder  603  which is towards the wall. The friction plate  606  is provided under the adhesive paper sheet  601  and is directly pressed against the surface of the wall. The friction plate  606  is also provided with a friction sheet  616  with high frictional coefficient on the surface thereof which is towards the wall. When a heavy object is placed on the holder, a torque applied on the base will be generated. The torque pulls and detaches the base from the wall while it presses the friction plate onto the wall. The sizes of the device can be so designed that the maximal static frictional force between the friction plate and the wall will be enough to bear the weight of the object and the holder within the maximal static frictional force. Thus, the friction plate bears all of the weight, while the base only bears the force perpendicular to the wall. Therefore, the adhesive sheet type holding device for mounting onto a wall according to the present invention can bear large load and can be fixed on the wall securely and durably.