Abstract:
A sawing table comprises a plate, a positioning device and a guiding device. The positioning device includes a positioning board and a fastening bar which is utilized to fasten the positioning board on the plate for providing a restriction. The guiding device is disposed under the plate and characterized by having lugs engaging the positioning board with chains. Thus, the positioning board is movably guided or alternatively fastened on the plate by operating the fastening bar.

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS 
       [0001]    Not applicable. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a sawing table; more particularly, to a sawing table providing an adjustable restriction for a work piece. 
         [0004]    2. Descriptions of the Related Art 
         [0005]    In the present days, buildings and mansions are widely constructed. After the main construction is accomplished, decoration issues for the construction would be subsequently concerned. During the decoration period, various manufacturing tools are needed, for example, hand tools, power drills, a sawing table, etc, while the sawing table with a rotary sawing machine is frequently utilized to saw or cut work pieces into segments during the decoration period. However, a bulky sawing table which may be made of cast iron or other weighty material is inconvenient for a user to move or carry. That is to say, the practical application of the bulky one would be limited. On the contrary, a sawing table, which is portable or facilitates to be assembled, would be suitable to be used among different working places by rapidly assembling and disassembling. Therefore, there has been recent interest in developing a sawing table which is light, portable, and detachable. 
         [0006]    A conventional sawing table  1  is illustrated in  FIG. 1 . The sawing table  1  mainly comprises a main plate  11 , a positioning board  13 , guiding gears  153 , two chains  155 , and a rotary sawing machine (not shown). The main plate  11  has two opposite slots  111  for the chains  155  disposed therethrough. The main plate  11  further has a short slot  113 , which is approximately disposed at the center of the main plate  11 , for a circular saw  17  of the rotary sawing machine to partially protrude therethrough. A cylinder  151  is disposed between the guiding gears  153  to enable the guiding gears  153  to rotate synchronously. Moreover, side boards  191 ,  193 ,  195 , and  197  are utilized to support the main plate  11  at an appropriate height. The sawing table  1  further comprises a driving board  14  which is utilized to guide the work pieces on the main plate  11  along the positioning board  13  and moving through the circular saw  17  for sawing. It is noted that the positioning board  13  is fixed onto the main plate  11  by operating a fastening bar  133 . In view of convenience for assembling, the aforesaid elements are able to be assembled into the whole structure of the sawing table  1  rapidly and facilely. Similarly, the sawing table  1  can be disassembled for being carried or stored easily to facilitate users&#39; daily use. 
         [0007]    However, there still exist some disadvantages of the conventional sawing table  1 . For instance, the slots  111 , which provide a moving space for the chains  155 , do not benefit for users as operating the sawing table  1 . When the work pieces are rough and uneven in surface, it may have risks of getting stuck in the slots  111 . It may cause dangers when the rotary sawing machine is operating. 
         [0008]    Furthermore, in order to provide a sufficient moving space for the chains  155 , the main plate  11  must have a certain thickness to be rigid enough. To give an example in practical use, the thickness of the chains  155  is approximate 9 mm. In view of the above, the main plate  11  should have a thickness greater than the thickness of the chains  155 , such as at least 10 mm. In convention, for providing the main plate  11  with a certain thickness, at least two plates are usually adopted to stick or glue together for forming the main plate  11 . Accordingly, the stacked plates may suffer from deformation or incomplete attachment. 
         [0009]    Needless to say, small pieces and dusts would be produced when the sawing table  1  is utilized to saw the work pieces. The small pieces and dusts may fall into slots  111  and stick to the chains  155 . Obviously, it would be harmful to the sawing table  1  for long-term operation. 
         [0010]    Therefore, a novel sawing table, which facilitates to be assembled and detachable, for providing an adjustable restriction for a work piece needs to be developed in this field. 
       SUMMARY OF THE INVENTION 
       [0011]    The primary objective of this invention is to provide a sawing table. The sawing table comprises a plate and a positioning device which is provided for guiding the movement of working pieces. The positioning device is guided by a guiding device and fastened by a fastening bar, for adjusting the position corresponding to the dimension of the working pieces. 
         [0012]    Another objective of this invention is to provide a sawing table. The guiding device of the sawing table is disposed under the plate. Thus, the plate can provide an overall working surface for the working pieces without slots. 
         [0013]    Yet a further objective of this invention is to provide a sawing table. The plate of the sawing table can be composed of single layer which is selected from a group consisting essentially of lumber, aluminum, and plastic material. Therefore, it would reduce risks of deformation or incomplete attachment. 
         [0014]    To achieve the above-mentioned objectives, the sawing table of the present invention comprises a plate, a positioning device and a guiding device. The plate comprises a surface, a first side, and a second side opposing to the first side. The positioning device comprises a positioning board, which is disposed on the surface of the plate, and a fastening bar. The positioning board further comprises a first end extending from the first side and a second end extending from the second side. The fastening bar is disposed on the first end for operably restricting the positioning board onto the plate. The guiding device is disposed under the plate and comprises a first chain disposed along the first side, a first connecting element, a second chain disposed along the second side, and a second connecting element. The first connecting element is utilized to connect the first end with the first chain and the second connecting element is utilized to connect the second end with the second chain. Specifically, the first and second connecting elements are lugs. According to the above disclosures, the positioning board is guided or alternatively fastened on the plate by operating the fastening bar. 
         [0015]    The detailed technology and preferred embodiments implemented for the subject invention are described in the following paragraphs accompanying the appended drawings for people skilled in this field to well appreciate the features of the claimed invention. 
     
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0016]      FIG. 1  is a schematic view illustrating a conventional sawing table; 
           [0017]      FIG. 2  is a schematic view illustrating a sawing table of the present invention; and 
           [0018]      FIG. 3  is a cross-sectional view illustrating the sawing table of the present invention. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0019]    Please referring to  FIG. 2 , a sawing table  2  of the present invention is illustrated. The sawing table  2  comprises a plate  21 , a positioning device  23 , and a guiding device  25 . The plate  21 , which could be made of a material selected from a group consisting essentially of lumber, aluminum, and plastic material, comprises a surface  211 , a first side  215 , and a second side  217  which is opposing to the first side  215 . The surface  211  of the plate  21  is utilized to provide a working plane for work pieces. 
         [0020]    The sawing table  2  further comprises a plurality of side boards for supporting the plate at a height. In the present invention, preferably, four side boards  291 ,  293 ,  295 , and  297  are disclosed. More specific, the side boards  291 ,  293 ,  295 , and  297  can be easily assembled or rapidly disassembled to facilitate users to carry them individually. 
         [0021]    The positioning device  23  comprises a positioning board  231 , which is disposed on the surface  211  of the plate  21 , and a fastening bar  233 . Similarly, the positioning board  231  is made of a material selected from a group consisting essentially of lumber, aluminum, and plastic material. Please simultaneously refer to  FIG. 3 , which is a cross-sectional view illustrating the sawing table  2  of the present invention. The positioning board  231  further comprises a first end  232  and a second end  234 , wherein the first end  232  extends from the first side  215  and the second end  234  extends from the second side  217  above the surface  211  of the plate  21 . Furthermore, the fastening bar  233  is disposed on the first end  232  for operably restricting the positioning board  231  on the plate  21 . 
         [0022]    The guiding device  25  of the present invention is disposed under the plate  21 . The guiding device  25  comprises a first chain  255  disposed along the first side  215  and a second chain  257  disposed along the second side  217 . The first and second chains  255 ,  257  are engaged with two gears  253  respectively that rotate synchronously with two cylinders. As shown in  FIG. 2 , a cylinder  251  is illustrated and the other (shown by broken lines) is disposed on the other side of the sawing table. The guiding device  25  further includes a first connecting element  31  and a second connecting element  41 , wherein the first connecting element  31  is utilized to connect the first end  232  with the first chain  255  and the second connecting element  41  is utilized to connect the second end  234  with the second chain  257 . 
         [0023]    Preferably, the first connecting element  31  and the second connecting element  41  can be lugs. In addition, as shown in  FIG. 3 , the first connecting element  31  and second connecting element  41  are individually fastened onto the first end  232  and the second end  234  by screws  37 ,  47 . Furthermore, the first and second connecting elements  31 ,  41  are individually connected to the first chain  255  and the second chain  257  by rivets  33 ,  43 . By the first and second connecting elements  31 ,  41  fastening with the chains  255 ,  257 , the positioning board  231  would be guided on the plate  21  and simultaneously moved with the chains  255 ,  257 . 
         [0024]    The operations of the fastening bar  233  would be described as follows. The fastening bar  233  comprises a first contacting element  235  that can be driven to contact onto the first side  215  when the fastening bar  233  is operated to an engaging position. Particularly, the fastening bar  233  comprises an eccentric cam  239 . When the eccentric cam  239  is rotated by the fastening bar  233  to the engaging position, the first contacting element  235  would be driven to contact onto the first side  215 . 
         [0025]    When the fastening bar  233  is operated to an engaging position, the second contacting element  41  would contact to the second side  217 . By the first and second contacting elements  235 ,  237  individually contacting to the first and second ends  215 ,  217 , the positioning board  231  could be firmly fastened onto the plate  21 . 
         [0026]    Please refer to  FIG. 2 , the sawing table  2  further comprises a slot  213 , which is disposed on the plate  21 , and a rotary sawing machine (not shown). The rotary sawing machine is disposed under the sawing table  2  and has a circular saw  27  partially protruding through the slot  213 . When a work piece is driven through the slot  213 , it can be cut into segments by the circular saw  27 . 
         [0027]    By controlling the fastening bar  233 , the positioning board  231  is movably guided or alternatively fastened on the plate  21 . After the positioning board  231  being fastened, the work piece could be put onto the plate  21  and driven along the positioning board  231  by a driving board  24 . Subsequently, the work piece would pass through the circular saw  27  and separated into segments. 
         [0028]    The sawing table of the present invention comprises a plate without any slot for the chains  255 ,  257 . Therefore, the rigidness thereof is strong enough that only one plate  21  is sufficient to serve as the working surface. Accordingly, the plate of the sawing table can be composed of single layer which is selected from a group consisting essentially of lumber, aluminum, and plastic material. Moreover, because the plate of the sawing table of the invention has a whole structure without slots therethrough at the sides, the small work pieces and dusts would not fall into the slots and get stuck to the chains. 
         [0029]    The above disclosure is related to the detailed technical contents and inventive features thereof. People skilled in this field may proceed with a variety of modifications and replacements based on the disclosures and suggestions of the invention as described without departing from the characteristics thereof. Nevertheless, although such modifications and replacements are not fully disclosed in the above descriptions, they have substantially been covered in the following claims as appended.