Abstract:
An angle adjustable sawing table adapted to allow the installation of a circular saw. Wood material is placed at pre-set geometric angles. One end of a gage is placed on a table, and another end of the gage is flush against a measurement member for adjustment to a preset angle.

Description:
BACKGROUND OF THE INVENTION 
   (a) Field of the Invention 
   The present invention is related to an angle adjustable sawing table, and more particularly, to one that allows direct measurement of geometric angles of wood materials for cutting. 
   (b) Description of the Prior Art 
   A sawing table on site is perhaps the most important tool in any decoration job for a carpenter. Usually the table has a foundation comprised of four pieces of boards including two girders and two stretchers with a table inserted on the top and a circular saw below the table. 
   In the prior art, the board is placed on the table and measured manually for the geometric angle and the finished size to be cut; then the board is marked when the angle is determined, to allow the circular saw to cut the board into the size and angle desired. However, in the absence of any measurement tools designed for the sawing table, all the measurements and geometric angles must be done manually resulting in wasted time, and poor accuracy and efficiency. 
   SUMMARY OF THE INVENTION 
   The primary purpose of the present invention is to provide a sawing table that saves the efforts of manual measurement. To achieve the purpose, the present invention is adapted with control and measurement units and allowing adjustment of an angle. The control unit facilitates the installation of a circular saw depending on the size of the circular saw, the thickness and the width of the board. A turning arm of the measurement unit is turned to the location preset for the cutting angle, and the board is placed on the table and flushed against the turning arm, the circular saw traveling on the rectangular rail is led to cut. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1A  is a perspective view showing an assembly of a saw table of the present invention. 
       FIG. 1B  is an exploded view of the present invention. 
       FIG. 1C  is a schematic view showing the bottom of a top of the saw table of the present invention. 
       FIG. 2A  is a perspective view showing the appearance of a connection block of a control unit of the present invention. 
       FIG. 2B  is a section view of the connection block of the control unit of the present invention. 
       FIG. 3A  is a schematic view showing the guide rail facing up of the control unit. 
       FIG. 3B  is a schematic view showing the guide rail facing down of the control unit. 
       FIGS. 4A ,  4 B,  4 C,  4 D,  4 E, and  4 F are side sectional views showing the adjustment of thickness and width of the control unit of the present invention. 
       FIGS. 4G ,  4 H, and  4 I are front sectional views showing the adjustment of thickness and width of the control unit of the present invention. 
       FIGS. 5A and 5B  are schematic views showing the layout of the control unit before the measurement of the angle by a square. 
       FIG. 6A  is a schematic view showing the angle measurement by the square. 
       FIGS. 6B and 6C  are schematic views showing the adjustment of the turning arm to cut on the saw table after the measurement of the angle by the square. 
       FIG. 7A  is a schematic view showing the measurement of another angle by the square. 
       FIG. 7B  is a schematic view showing the adjustment of the turning arm to cut on the saw table after the measurement of the angle by the square. 
       FIG. 8  is a schematic view showing that a circular saw is cutting a board. 
       FIG. 9  is a schematic view showing another gear set is adapted to where beneath the saw table of the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Referring to  FIGS. 1A ,  1 B,  1 C,  2 A,  2 B,  3 A and  3 B, the present invention is essentially comprised of a table  1 , a top  11 , a control unit  2  and a measurement unit  3 . 
   The table  1  is provided on one side with a longitudinally recessed guide trough  12  to be inserted with a plank  1 A in the same size of the guide trough  12 , and the plank  1 A is secured to the table  1  with multiple screws  1 B penetrating from beneath the top  11 . As a circular saw  4  is processing on a board  4 A, it cuts farthest into the plank  1 A without damaging the top  11 . Besides, the plank  1 A is a consumption item and can be replaced at any time when worn out to a certain extent. Each side of both shorter sides of the guide trough  12  is provided with a positioning hole  13  and a guide rail slot  14  for the assembly and positioning of two pairs of connection blocks  2 B from the control unit  2 . An axial hole  15  penetrates through the table  1  on one side of the guide trough  12  where the guide rail slot  14  is provided. 
   The control unit  2 , comprised of a pair of guide rails  2 A and two pairs of the connection blocks  2 B, is provided on the top  11  at the same side where the guide trough  12  is located. One pair of the connection blocks  2 B is raised and locked to the positioning holes  13  disposed at both ends on one side of the table  1  using two screws  1 B and two winged nuts  1 C. Similarly, another pair of the connection blocks  2 B is raised and locked to the guide rail slot  14  on the inner side of the table  1  with two screws  1 B and two winged nuts  1 C. The pair of the connection blocks  2 B on the guide rail slot  14  is readily free to reciprocally travel thereon by loosening the winged-nuts  1 C. The pair of guide rails  2 A is provided striding over the plank  1 A by means of those two pairs of the connection blocks  2 B erected on the top  11 . A chamber  2 A 1  defined in each end of the pair of the guide rails  2 A merely accommodates its respective connection block  2 B. A screw hole  2 A 2  is each provided on both sides of the chamber  2 A 1 , and a multi-sectional adjustment channel  2 B 1  hollowed in an “E” shape is each provided on both sides of the connection block  2 B for the screw  1 B and the winged-nut  1 C to lock each connection block to the guide rail  2 A. Accordingly, the pair of the guide rails  2 A is integrated with both pairs of the connection blocks  2 B. 
   The measurement unit  3  is comprised of a turning arm  3 A and a gear set. A shaft  3 A 1  extends from the bottom of the fixed end of the turning arm  3 A and passes downward through an axial hole  15  on the top  11  to be pivoted to the gear set disposed beneath the top  11 . A square hole  3 A 3  and a magnifier  3 C are provided on the surface  3 A 2  at a position closer to the free end of the turning arm  3 A. The square hole  3 A 3  is disposed at a position in relation to an arc hole  16  penetrating through the top  11 , and a handle  3 D is inserted through the square hole  3 A 3  and the arc hole  16  to lock the turning arm  3 A to the top  11  to control turning and positioning of the turning arm  3 A for facilitating the adjustment of the cutting angle. A miter gage  17  of the same curve as that of the arc hole  16  is provided on the top  11  over the arc hole  16  for the angle adjustment by the turning arm  3 A, and for turning the magnifier  3 C provided on the surface  3 A 2  of the turning arm  3 A to magnify the scales of the miter gage  17  to facilitate observation and measurement. The gear set is comprised of a large gear  3 E, a medium gear  3 F, and a small gear  3 G in a specific gear ratio of 1:2. Wherein, the large gear  3 E is provided at a position where the axial hole  15  is located below the top  11 , and an axial hole  3 E 1  at the center of the large gear  3 E and the shaft  3 A 1  of the turning arm  3 A is inserted into the axial hole  3 E 1 . A screw  3 H adapted with a washer penetrates through the turning arm  3 A, the axial hole  15  and the large gear  3 E, and is secured with a nut and washer, not referenced. The medium gear  3 F and the small gear  3 G are in sequence secured to where beneath the top  11  with a screw  1 B and washers (not referenced) with the small gear  3 G located between the large gear  3 E and the medium gear  3 F to engage to one another to become a synchronous link subsystem. The medium gear  3 F indicates a semi-circular shape and is connected on its side not provided with teeth to a rule  3 F 1  for a square  5 . The square  5  is comprised of two rules at a right angle to each other, to be positioned flush against the turning arm to directly calibrate the swinging angle of the turning arm  3 A. 
   The circular saw  4  is provided striding between the pair of guide rails  2 A of the control unit  2  to reciprocally travel on the pair of guide rails  2 A in a smooth and reliable fashion to help upgrade sawing quality of the finished product of the board  4 A. Furthermore, the installation site on the table  1  for the circular saw  4 , depending on its size, can be adjusted in conjunction with the pair of guide rails  2 A and two pairs of the connection blocks  2 B to process the board  4 A in different width and thickness. 
   Now referring to  FIGS. 4A ,  4 B,  4 C,  4 D,  4 E,  4 F,  4 Q  4 H, and  4 I, wherein, both ends of each rail rise to be tightly caught in their respective chambers  2 A 1  upon adjusting the pair of guide rail  2 A. Multiple screws  1 B and winged nuts  1 C secure each connection block  2 B into each chamber  2 A 1  through the screw hole  2 A 2  and the multi-sectional adjustment channel  2 B 1 . Accordingly, both guide rails  2 A stride over and are locked to those two pairs of the connection blocks  2 B. Whereas the guide rail slot  14  on the top  11  permits the pair of the connection blocks  2 B to reciprocally travel in the guide rail slot  14  by fast loosening and retightening their respective screws  1 B and winged nuts  1 C, both guide rails  2 A move synchronously to have the width between both guide rails  2 A adjusted for compromising the specification of the circular saw  4  to be installed on the table  1  depending on the width and thickness of the board  4 A placed on the top  11  for cutting. 
   By fast loosening and retightening those screws  1 B and winged nuts  1 C that lock up the pair of guide rail  2 A to their respective connection blocks  2 B, both pairs of the connection blocks  2 B are adjusted to permit longitudinal movement of both ends of the pair of guide rails  2 A for ascending or descending the circular saw  4  disposed between both guide rails  2 A according to the specification of the circular saw  4  until it could handle the thickness of the board  4 A. Accordingly, those screws  1 B and winged nuts  1 C are retightened to hold the circular saw  4  at a proper working height depending on the thickness of the board  4 A to be placed on the top  11  for the circular saw  4  to cut. 
   The cutting angle of the board  4 A is directly adjusted by the measurement unit  3  on the top  11  for the circular saw  4  to cut the board  4 A into the preset angle. Manual measurement and solving the angle to mark the angle on the board  4 A for the circular saw  4  to cut by following the mark as required in the prior art are no longer necessary. 
   To make the measurement of the angle as illustrated in  FIGS. 5A ,  5 B,  6 A,  6 B,  6 C,  7 A, and  7 B, one rule of the square  5  is placed on the table  1 , and the medium gear  3 F is turned until its rule  3 F 1  is flushed against the other rule of the square  5 . Whereas both of the small gear  3 G and the large gear  3 E are synchronously linked to the medium gear  3 F, the turning arm  3 A integrated with the large gear  3 E with the screw  3 H adapted with a washer is also turned to reach the preset angle. The turning arm  3 A is secured in position at the preset angle by loosening and retightening the handle  3 D pivoted through the square hole  3 A 3  on the turning arm  3 A and the arc hole  16  on the top  11 . The board  4 A is placed on the top  11  to firmly flush against the turning arm  3 A held in position at the preset angle. The circular saw  4  installed on the pair of the guide rails  2 A then cuts the board  4 A following the preset angle. 
   Alternatively, the magnifier  3 C provided on the surface  3 A 2  of the turning arm  3 A on the top  11  magnifies the miter gage  17  is used to observe the measurement. Once the turning arm  3 A is turned to the location pinpointed by the miter gage  17 , the handle  3 D is loosened and retightened again to hold the turning arm  3 A at the location of the miter gage  17  as observed, and the board  4 A is placed on the top  11  until it is firmly flushed against the turning arm  3 A for the circular saw  4  installed on the pair of the guide rails  2 A to cut the board  4 A at the preset angle. 
   Accordingly, the table  1  of the present invention cuts the board  4 A without having to do the manual calculation of the geometric angle for the board  4 A and avoids the possible inaccuracy in solving the preset angle simply by measuring the geometric angle with the square  5  and directly placing one rule of the square  5  on the table  1  and the other rule flushed against the rule  3 F 1  of the medium gear  3 F to adjust the turning arm  3 A to reach at the present angle for the circular saw  4  installed on the pair of the guide rails  2 A to cut the board  4 A at the preset angle. 
   As illustrated in  FIG. 8 , the gear set of the present invention can be comprised of the large gear  3 E, the medium gear  3 F and a drive belt  3 J at the gear ratio of 1:2. Wherein, the large gear  3 E is placed at where the axial hole  15  is located beneath the top  11 , and the axial hole  3 E 1  at the center of the large gear  3 E is inserted by the shaft  3 A 1  of the turning arm  3 A. The screw  3 H adapted with a washer connects the turning arm  3 A, the axial hole  15  and the large gear  3 E into a one piece. The medium gear  3 F is fixed to where beneath the top  11  with the screw  1 B, and the drive belt  3 J is inserted at where between the large gear  3 E and the medium gear  3 F to link both gears  3 E,  3 F for synchronous movement to have the turning arm  3 A integrated with the large gear  3 E by means of the screw  3 H adapted with a washer to arrive at the preset angle. One upholding rod  3 I is each provided on both sides of the drive belt  3 J disposed between the large and the medium gears  3 E,  3 F. A head  3 I 1  of the upholding rod  3 I merely contacts the outer edge of the driver belt  3 J to prevent the drive belt  3 J from falling off its place during the transmission of both the large and the medium gears  3 E,  3 F as driven by the drive belt  3 J. 
   Furthermore, as illustrated in  FIG. 9 , the board  4 A is placed at a right angle on the top  11  of the table  1 , and the space on the top  11  is not sufficient for the placement of the board  4 A due to the presence of the turning arm  3 A of the measurement unit  3  on the top  11 . The turning arm  3 A of the measurement unit  3  on the top  11  is removed before placing the board  4 A on the top  11  at a right angle. 
   It is to be noted that the preferred embodiments disclosed in the present invention are not used to limit the scope of the present invention, and that any equivalent change and decoration to the form, construction, characteristics and teaching described in the Claims of the present invention shall be deemed as falling within the scope of those Claims.