Abstract:
A roller type adjustable screen fixing apparatus includes: a fixing base, having at least one operating slot; at least one distal plate device disposed at an external side of the distal plate, having at least two distal plates embedded in the operating slot, and slidably moving in the operating slot, and a frame plate disposed at an external side of the distal plate; at least one linking device, having at least one roller installed in the operating slot and linked with the distal plate; and a containing space, defined by the upper frame plates of the corresponding distal plates for installing a screen. The distal plate is contractible in the operating slot for adjusting the containing space, such that the invention can fit screens of different sizes, and provide a convenient replacement and a dynamic adjustment.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a roller type adjustable screen fixing apparatus, and more particularly to a screen fixing apparatus flexibly installed around the periphery of a screen for changing the size and form of the screen to provide a very convenient and cost-effective apparatus with an easy and efficient installation. 
     2. Description of the Related Art 
     Electronic multimedia is generally used for advertising, and screen becomes a mainstream of such electronic advertising with dynamic multimedia audio/video effects. With reference to  FIG. 1  for a structure of a conventional screen fixing base, the screen fixing base comprises: a fixing base  90 , having a frame  91  and an embedding space  92  defined by the frame  91 . When the structure is used, the fixing base  90  is mounted onto or embedded into a wall  100 , and a screen  93  is installed and fixed at an embedding space  92  of the fixing base  90 , such that the screen  93  can be used for audio and video advertising or propagandas. Although the fixing base  90  can achieve the effect of containing and positioning the screen  93 , there are drawbacks, such as if the area or size of the screen  93  cannot meet the actual need and the fixing base  90  no longer can be used, it is necessary to exchange or expand the screen  93 , or else the fixing base  90  will become a waste. The prior art is not cost-effective, or even causes an environmental issue for the disposal. If it is necessary to change the size of a screen  93  with a changed fixing base  90 , the fixed base  90  has to be changed again. Obviously, the design of the structure of the conventional screen fixing base is not good enough. Therefore, it is an important subject for related manufacturers to develop a cost-effective screen fixing apparatus to overcome the shortcomings of the prior. 
     In view of the foregoing shortcomings of the conventional screen fixing base and its structural design, the inventor of the present invention based on years of experience in the related industry to develop a convenient and cost-effective roller type adjustable screen fixing apparatus to serve the general public and promote the related industry. 
     SUMMARY OF THE INVENTION 
     Therefore, it is a primary objective of the present invention to provide a roller type adjustable screen fixing apparatus extended or contracted from the periphery of the fixing base to fit screens of different sizes, and cover a larger range of generality to prevent the manufacturing and inventory issues of fixing bases of different sizes, so as to give better economic benefits to its manufacture. 
     Another objective of the present invention is to provide a roller type adjustable screen fixing apparatus capable of changing a screen of a different size conveniently and adjusting the screen dynamically, so as to provide better economic benefits to its use. 
     To achieve the objectives and effects of the present invention, the technical measures taken by the invention comprises: a fixing base, having mutually perpendicular operating slots disposed on both surfaces of said fixing base respectively; at least one distal plate device, having two distal plates, embedded into and positioned at the operating slot for sliding and moving correspondingly, and an external side of the distal plate having an upper frame plate; at least one linking device, having at least one roller installed in the operating slot, and linked with the distal plate; and a containing space, defined by upper frame plates of the pair of distal plates, for installing a screen. 
     The technical measure of the link rod type adjustable screen fixing apparatus further comprises: a fixing base, having two operating slots; two distal plate devices, having two first distal plates and two second distal plates, and the first distal plate and the second distal plate being positioned at the two operating slots respectively for sliding and moving, and external sides of the first distal plate and the second distal plate having an upper frame plate separately; a linking device, having a first roller and a second roller installed in the two operating slots respectively, and the first linking device being linked with the first distal plate, and the second linking device being linked with the second distal plate; and a containing space, defined by upper frame plates of the first distal plates and the second distal plates for installing a screen. 
     To make it easier for our examiner to understand the technical characteristics and effect of the present invention, we use preferred embodiments with accompanying drawings for the detailed description of the invention as follows: 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view of a structure of a screen fixing base in accordance with a prior art; 
         FIG. 2  is an exploded view of the present invention; 
         FIG. 3  is a schematic view of separating a screen fixing apparatus from a screen in accordance with the present invention; 
         FIG. 4  a schematic view of combining a screen fixing apparatus with a screen in accordance with the present invention; 
         FIG. 5  is a schematic view of installing a second linking device in accordance with the present invention; and 
         FIG. 6  is a schematic view of operating the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     With reference to  FIGS. 2 and 3 , a roller type adjustable screen fixing apparatus of the invention comprises: a fixing apparatus  10 , a first distal plate device  20 , a second distal plate device  30 , a first linking device  40  and a second linking device  50 , wherein the fixing apparatus  10  includes a fixing base  11  substantially in the shape of a plate, and having a transversal concave operating slot  12  in the middle of a side (a front side); the operating slot  12  includes a central positioning pillar  13  disposed in the middle of the operating slot  12 , and both sides of the central positioning pillar  13  have a lateral positioning pillar  15 ,  16  each, and the lateral positioning pillars  15 ,  16  are generally not aligned on the same line and come with a slight height difference. In addition, both left and right sides of the fixing base  11  include a serrated press plate  14  disposed separately at a position corresponding to a connecting position of the corresponding operating slot  12  and protruded towards the operating slot  12 . Another side (such as the rear side) of the fixing base  11  includes a longitudinal concave operating slot  17  disposed at the middle position, and both upper and lower sides of the fixing base  11  include a serrated press plate  18  disposed separately at a position corresponding to a connecting position of the corresponding operating slot  17  and protruded towards the operating slot  17 , and the central positioning pillar  13  is protruded from the middle position of the operating slot  17 . 
     The first distal plate device  20  includes two first distal plates  21 , and the first distal plate  21  includes a frame plate  22 , a long arm  23 , and a short arm  24  extended towards the internal side (according to the assembling direction), and the long arm  23  and the short arm  24  are disposed at upper and lower ends (or lower and upper ends) respectively, and extended into the operating slot  12 , wherein the long arm  23  has an abutting end  25  (such as a serrated end) disposed on a surface facing towards the operating slot  12 . When the first distal plate device  20  is assembled, the first distal plates  21  are installed on both left and right sides of the operating slot  12 , and the long arm  23  is disposed on the right side of the first distal plate  21 , and the long arm  23  on the left side of the first distal plate  21  is disposed at the bottom. 
     The second distal plate device  30  includes two second distal plates  31 , and the second distal plate  31  includes a frame plate  32  and a long arm  33  and a short arm  34  extended towards the internal end (according to the assembling direction), and the long arm  33  and the short arm  34  are disposed at upper and lower ends (or lower and upper ends) respectively, and extended into the operating slot  17 , wherein the long arm  33  has an abutting end  35  (such as a serrated end) disposed on a surface facing towards the operating slot  17 . When the second distal plate device  30  is assembled, the second distal plates  31  are disposed at both upper and lower ends of the operating slot  17 , and the long arm  33  at the upper end of the second distal plate  31  is disposed on the right side, and the long arm  33  at lower end of the second distal plate  31  is disposed on the left side. The frame plates  22 ,  32  at the four sides are used to define a space for containing and mounting a screen  60 . 
     The first linking device  40  includes a first roller  41 , and a first transmission roller  42  and a second transmission roller  43  on both sides of the first roller  41  are installed at the position of the central positioning pillar  13  by means of serrations (or abutting), and the first transmission roller  42  and the second transmission roller  43  are installed at the lateral positioning pillars  15 ,  16 , wherein the first transmission roller  42  is engaged with an abutting end  25  (with respect to the top of operating slot  12 ) at the first distal plate  21  on the right side by means of serrations (or abutting), and the second transmission roller  43  is engaged with an abutting end  35  (with respect to the bottom of the operating slot  12 ) at the first distal plate  21  on the left side by means of serrations (or abutting). Therefore, the two first distal plates  21  on both left and right sides can be separated or contacted sideway (in opposite operating directions) according to the link relations between the first transmission roller  42  and the first roller  41  and between the second transmission roller  43  and the first roller  41 . The first roller  41 , the first transmission roller  42  and the second transmission roller  43  are gears or any other wheels linked with each other, and the first transmission roller  42  and the second transmission roller  43  are gears or any other wheels linked with the abutting ends  25 ,  35 . 
     With reference to  FIG. 5  together, the second linking device  50  includes a second roller  51  installed at the central positioning pillar  13  and disposed in the operating slot  17 , and both sides of the second roller  51  are engaged with the abutting ends  35  of the second distal plates  31  on both sides by means of serrations (or abutting), such that the two upper and lower second distal plates  31  can be separated or attached vertically up and down (in opposite operating directions) according to the linking relation of the second roller  51 , wherein the second roller  51  and the first roller  41  are rotated synchronously or independently, and the second roller  51  is a gear or any other wheel linked with the abutting end  35 . 
     When the roller type adjustable screen fixing apparatus is assembled, the two first distal plates  21  are transversally embedded into both sides of the operating slot  12 , and the first linking device  40  is installed in the middle of the operating slot  12  (as shown in  FIGS. 3 and 4 ), and the first distal plate  21  can be slid and moved in the operating slot  12 , and the first distal plate  21  is blocked by the press plate  14  and limited in the operating slot  12 , such that the first distal plate  21  can be contracted transversally with respect to the first linking device  40  for an embedding operation. With the interface of the first linking device  40  for the transmission, the two left and right first distal plates  21  are displaced with the same distance. The two upper and lower second distal plates  31  are embedded longitudinally into both upper and lower ends of the operating slot  17 , and the second linking device  50  is installed in the middle of the operating slot  17  (as shown in  FIG. 5 ), such that the second distal plate  31  contracts the second linking device  50  longitudinally for an embedding operation. With the interface of the second linking device  50  for the transmission, the two upper and lower second distal plates  31  can be displaced with the same distance. 
     With reference to  FIG. 6  for changing the screen  60  with a larger one in accordance with the present invention, the design of the first distal plate  21  and the second distal plate  31  combined with the first linking device  40  and the second linking device  50  respectively is used for pulling the first distal plate  21  (the frame plate  22 ) and the second distal plate  31  (the frame plate  32 ) to link the transmission of the first linking device  40  and the second linking device  50  respectively, such that the first distal plate  21  and the second distal plate  31  are extended equidistantly towards the external side in a transversal or longitudinal direction to increase the containing space formed by the frame plates  22 ,  32  for changing to a larger screen  60 . Similarly, if it is necessary to change to a smaller screen  60 , the aforementioned procedure is operated in a reverse order to decrease the containing space formed by the frame plate  22 ,  32  for the installation of a smaller screen  60 . 
     The roller type adjustable screen fixing apparatus of the invention is installed into the longitudinal or transversal operating slot by means of the fixing base (at front side or rear side), and its longitudinal or transversal operating slot is provided for installing the distal plate (the two first distal plates or second distal plates) and the linking device (the first linking device or second linking device), such that the distal plate can be contracted or slid in the longitudinal or transversal operating slot, and the size of the containing space can be changed flexibly by the frame plates of the distal plates. The invention can fit screens of different sizes, and cover a larger range of generality to prevent the manufacturing and inventory issues of fixing bases of different sizes, so as to give better economic benefits to its manufacture. 
     While the invention has been described by means of specific embodiments, numerous modifications and variations could be made by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims.