Abstract:
A simply-constructed paint-spraying platform comprises: a platform body comprising a top wall, a ventilation part, a bottom wall, two support plates, and a backing plate. When in use, the paint-spraying platform is expanded, and the article to be painted is hung on the first and second hooking holes or placed on the backing palate for spraying paint by using a spray gun. Therefore, the advantages including easy carriage, good ventilation, low cost, and enhanced steadiness can be provided.

Description:
FIELD OF THE INVENTION 
   The present invention relates to a simply-constructed paint-spraying platform, and more particularly to a foldable and expandable paint-spraying platform to provide the advantages including easy carriage, good ventilation, low cost, and enhanced steadiness. 
   BACKGROUND OF THE INVENTION 
   The students and non-professional persons generally use a simply-constructed and paper-made paint-spraying platform for performing the paint spraying process. This simply-constructed paint-spraying platform is commonly a foldable paper box. In the opening mode, the foldable paper box has an opening on the front surface to prevent the paint from random scattering, and thus no cleaning is required. Therefore, it is very convenient to use. 
   However, the conventional paint-spraying platform has drawbacks as listed below: 
   1. The paper plates on both sides of the opening are foldable/unfoldable and very unsteady, and thus the paper plates may be refolded up easily, causing the paint-spraying platform to be toppled down easily when the article to be sprayed is hung thereon. 
   2. In the absence of ventilation hole, the odor of paint, which generates peculiar smell, is left on the paint-spraying platform easily. 
   3. A high-cost honeycomb-shaped pad is mounted on the paint-spraying platform under the opening for holding the article to be sprayed, and the total cost is thus increased. 
   As a result, there exists a need to disclose an improved paint-spraying platform for overcoming the conventional drawbacks. 
   SUMMARY OF THE INVENTION 
   In view of the aforesaid drawbacks of the conventional structure, a major object of the present invention is to disclose a steady, good-ventilation, and low-cost paint-spraying platform. 
   In order to achieve the above-mentioned object, a paint-spraying platform comprises: a platform body comprising a top wall, a ventilation part, a bottom wall, two support plates, and a backing plate. 
   The top wall comprises a top reception plate and a bottom reception plate. The top reception plate has at lest one first insertion plate on the top, at least one insertion notch and a first folding edge on the bottom, and two first positioning fins on both sides, respectively. The bottom reception plate has a second folding edge on the bottom, a third folding edge between the second folding edge and the first folding edge, and two first insertion holes penetrating through both sides, respectively. 
   The ventilation part is for connection with the top wall via the second folding edge on the top. The ventilation part has a fourth folding edge on the bottom, a first ventilation hole penetrating through the region between the fourth folding edge and the second folding edge, a first ventilation device connected with the first ventilation hole, two second positioning fins located on both sides of the first ventilation hole, respectively, two fifth folding edges formed on the bottoms of the second positioning fins, respectively, and two second insertion holes formed on the center regions of the fifth folding edges, respectively. 
   The bottom wall has a bottom plate on the center. The bottom plate has a ventilation folding plate on the top, two lateral folding plates on both sides, and a bottom folding plate on the bottom. The top of the ventilation folding plate can be bent by means of the fourth folding edge to connect with the ventilation part. The ventilation folding plate has two first positioning plates protruding respectively from both sides and a sixth folding edge on the bottom. At least one second ventilation hole penetrates through the region between the sixth folding edge and the fourth folding edge for ventilation. Each of the lateral folding plates has a second insertion plate at the outer border, a seventh folding edge on the bottom, a second insertion hole penetrating through the seventh folding edge, and a second double-folding section formed on the center region between the seventh folding edge and the second insertion plate. The second double-folding section has a first folding line and a second folding line on both sides, respectively. The lateral folding plate has a second positioning plate and a third positioning plate protruding from one side. The bottom folding plate has a plurality of third insertion plates protruding from the bottom, an eighth folding edge on the top, a third insertion hole penetrating through the eighth folding edge, and a third double-folding section formed on the center region between the third insertion hole and the third insertion plates. The third double-folding section has a first folding line and a second folding line on both sides, respectively. 
   The support plates are for connection with both sides of the top wall and the ventilation part, and the support plates are located on the bottom wall. Each of the support plates has a first protruding plate protruding from the top. The first protruding plate has a folding line on the bottom and a positioning hole penetrating through the folding line, wherein the positioning hole is located in position corresponding to the first positioning fin. Each of the support plates has a second protruding plate and a third protruding plate protruding from one side, wherein the second and third protruding plates are located in positions corresponding to the first and second insertion holes, respectively. 
   The backing plate has two vertical plates respectively on both sides, at least one through hole penetrating through one surface, and a second ventilation device connected to the through hole. 
   When in use, the paint-spraying platform is expanded, and the article to be painted is hung on first and second hooking holes or placed on the backing palate for spraying paint by using a spray gun. 
   By means of the above-mentioned structure, the paint-spraying platform of the present invention overcomes the conventional drawbacks and provides the advantages as follows: 
   1. Two support plates that have no folding line formed thereon can bilaterally support the platform body to provide high steadiness. 
   2. The paint-spraying platform has several ventilation holes and ventilation devices to provide good ventilation, and the ventilation devices further allow the paint to be left in the platform. 
   3. The backing plate that achieves purposes effectively is simply-constructed, and the total cost is thus reduced. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is an elevational diagram showing the closing status of the present invention. 
       FIG. 2  is an elevational diagram showing the opening status of the present invention. 
       FIG. 3  is an elevational diagram showing the opening status of the present invention viewed from a different angle. 
       FIG. 4  is an elevational, exploded diagram of the present invention. 
       FIG. 5  is a plan diagram showing the support plate of the present invention. 
       FIG. 6  is a plan diagram showing the top wall, the ventilation part, and the bottom wall of the present invention. 
       FIG. 7  is a schematic diagram showing the action for folding the top wall, the ventilation part, and the bottom wall of the present invention. 
       FIG. 8  is a schematic diagram showing the utilization status of the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   The objects, features, advantages, and benefits of the invention will become apparent in the following description taken in conjunction with the foregoing drawings. 
   Referring to  FIGS. 2 through 6 , a paint-spraying platform of the present invention comprises a platform body  10  comprising a top wall  1 , a ventilation part  2 , a bottom wall  3 , two support plates  4 , and a backing plate  5 . 
   The top wall  1  has a top reception plate  11  and a bottom reception plate  12 , wherein the top reception plate  11  further has at lest one first insertion plate  111  on the top, at least one insertion notch  112  on the bottom, and a first folding edge  113  on the bottom. The top wall  1  further has a first double-folding section  114  on the center region between the insertion notch  112  and the first insertion plate  111 . A first folding line  115  and a second folding line  116  are formed on both sides of the first double-folding section  114 , respectively. Several first hooking holes  117  are formed between the first folding line  115  and the first insertion plate  111 . Several second hooking holes  118  are formed between the second folding line  116  and the insertion notch  112 . Two first positioning hems  119  are formed on both sides of the top reception plate  11 , respectively. The aforesaid first double-folding section  114 , the first folding line  115 , and the second folding line  116  jointly allow the top reception plate  11  to be foldable. After folding, the first insertion plate  111  can be correspondingly inserted into the insertion notch  112 , and the first hooking holes  117  and the second hooking holes  118  are located in positions corresponding to one another. The top of the bottom reception plate  12  can be bent by means of the first folding edge.  113  to connect with the top reception plate  11 . In addition, the bottom reception plate  12  has a second folding edge  121  on the bottom. A third folding edge  122  is formed between the second folding edge  121  and the first folding edge  113 . The bottom reception plate  12  further has two first insertion holes  123  penetrating through both sides, respectively. 
   The top of the ventilation part  2  can be bent by means of the second folding edge  121  to connect with the top wall  1 . The ventilation part  2  has a fourth folding edge  21  on the bottom. The ventilation part  2  has a first ventilation hole  22  penetrating through the region between the fourth folding edge  21  and the second folding edge  121 , wherein a first ventilation device  23  is connected with the first ventilation hole  22 . Two second positioning hems  24  are formed on both sides of the first ventilation hole  22 , respectively. Two fifth folding edges  241  are formed on the bottoms of the second positioning hems  24 , respectively. Two second insertion holes  242  are formed on the center regions of the fifth folding edges  241 , respectively. 
   The bottom wall  3  has a bottom plate  31  on the center. The bottom plate  31  has a ventilation folding plate  32  on the top and two lateral folding plates  33  on both sides, respectively. The bottom plate  31  has a bottom folding plate  34  on the bottom. The top of the ventilation folding plate  32  can be bent by means of the aforesaid fourth folding edge  21  to connect with the ventilation part  2 . The ventilation folding plate  32  has two first positioning plates  321  protruding from both sides, respectively. The ventilation folding plate  32  has a sixth folding edge  322  on the bottom. The bottom wall  3  has at least one second ventilation hole  323  penetrating therethrough the region between the sixth folding edge  322  and the fourth folding edge  21 . Each lateral folding plate  33  has a second insertion plate  331  at the outer border and a seventh folding edge  332  on the bottom. The bottom wall  3  has a second insertion hole  333  penetrating through the seventh folding edge  332 . In addition, a second double-folding section  334  is formed on the center region between the seventh folding edge  332  and the second insertion plate  331 . Each second double-folding section  334  has a first folding line  335  and a second folding line  336  on both sides, respectively. Each lateral folding plate  33  has a second positioning plate  337  and a third positioning plate  338  protruding from one side. The aforesaid bottom folding plate  34  has several third insertion plates  341  protruding from the bottom and an eighth folding edge  342  on the top. In addition, the bottom folding plate  34  has a third insertion hole  343  penetrating through the eighth folding edge  342 . A third double-folding section  344  is formed on the center region between the third insertion hole  343  and the third insertion plates  341 . The third double-folding section  344  has a first folding line  345  and a second folding line  346  on both sides, respectively. 
   The support plates  4 , which are for connection with respective both sides of the top wall  1  and the ventilation part  2 , are located on the bottom wall  3 . Each support plate  4  has a first protruding plate  41  protruding from on the top. The first protruding plate  41  has a folding line  42  on the bottom and a positioning hole  43  penetrating through the folding line  42 . The positioning hole  43  is located correspondingly to the aforesaid first positioning fin  119 . Each support plate  4  has a second protruding plate  44  and a third protruding plate  45  protruding from one side and corresponding to the first and second insertion holes  123  and  242 , respectively. 
   The backing plate  5  has two vertical plates  51  on both sides, respectively, and at least one through hole  52  penetrating through one surface. In addition, a second ventilation device  53  is connected to the through hole  52 . 
   The assembled structures of the aforesaid components are shown in  FIGS. 1 ,  4 ,  6 , and  7 . The simply-constructed paint-spraying platform of the present invention is a rectangular box (shown in  FIG. 1 ) in the closing mode. The ventilation folding plate  32 , the lateral folding plates  33 , and the bottom folding plate  34  are bent upward by using the sixth folding edge  322 , the seventh folding edge  332 , and the eighth folding edge  342 . In addition, the third positioning plate  338  is bent, and the first folding lines  335  and the second folding lines  336  on respective both sides of the second double-folding sections  334  are bent oppositely so as to allow the second insertion plates  331  and the third insertion plates  341  to be inserted and positioned into the second and third insertion holes  333  and  343 . Each aforesaid third positioning plate  338  is located between the first folding line  335  and the second folding line  336  on one side. Each aforesaid first positioning plate  321  is inserted between the first folding line  335  and the second folding line  336  from the other side. Each aforesaid second positioning plate  337  is inserted between the first folding line  345  and the second folding line  346 . 
   By bending the fourth folding edge  21 , the ventilation part  2  is located on the bottom wall  3 , and the support plates  4  and the backing plate  5  are located between the ventilation part  2  and the bottom wall  3 . By bending the fifth folding edge  241 , the second positioning hems  24  can be inserted into the respective one side of the respective lateral folding plates  33 , and the ventilation part  2  is positioned on the bottom wall  3 . By bending the second folding edge  121  and the third folding edge  122 , the top reception plate  11  and the bottom reception plate  12  can be attached to the outer surface of the bottom wall  3 . In addition, the first positioning hems  119  are bent to be inserted into the second insertion holes  333 , respectively, from the other side. 
   In the opening mode, as shown in  FIG. 2 , the folding status of the bottom wall  3  is identical to that in the closing mode. The backing plate  5  is placed on the bottom plate  31 . The first folding line  115  and the second folding line  116  on both sides of the first double-folding section  114  are bent oppositely to allow the first insertion plate  111  to be inserted into the insertion notch  112  and allow the first hooking holes  117  and the second hooking holes  118  to attach to one another correspondingly. By bending the first folding edge  113 , the top and bottom reception plates  11  and  12  are bended by an angle. By bending the folding lines  42  of the support plates  4 , the first protruding plates  41  are bended by an angle, and the first positioning hems  119  are inserted into the positioning holes  43 . In addition, the second protruding plates  44  and the third protruding plates  45  are bended by an angle and inserted into the first insertion holes  123  and the second insertion holes  242 , respectively. 
   The utilization status of the aforesaid components is shown in  FIG. 8 . When in use, the simply-constructed paint-spraying platform is expanded, and the article to be painted is hung on the first and second hooking holes  117  and  118  or placed on the backing palate  5  for being painted by using a spray gun.