Abstract:
A carpenter&#39;s sawing machine that includes a base, an elongated saw support body, and a saw. The saw support body is pivotally attached to the base to change a first cutting angle of the saw. The saw is pivotally mounted in the saw support base to change a second cutting angle of the saw. The sawing machine is therefore capable of serving as a compound miter saw.

Description:
FIELD OF THE INVENTION 
     The present invention relates generally to a sawing machine, and more particularly to a carpenter&#39;s sawing machine capable of sawing in a horizontal direction and a longitudinal direction. 
     BACKGROUND OF THE INVENTION 
     A carpenter&#39;s sawing machine disclosed in the Taiwan Pat. 215,621 comprises a base which is provided with a long frame body fastened pivotally therewith. The frame body is provided in two sides thereof with a fastening seat which is in turn provided at the top thereof with two slide rods fastened uprightly therewith. The slide rods are intended to hold a hacksaw. The base is provided at the top thereof with a sectoral recess extending outward at an angle of 90 degrees. The sectoral recess is provided thereon with an angle graduation and in the bottom thereof with a locating hole opposite to the angle cutting line. Located oppositely to the locating hole is an urging rod and a curved rod which is fastened pivotally with the urging rod. The frame body is further provided in the lower end thereof with a pivot serving as a pivoting point of the curved rod, and a spring for confining the curved rod. 
     The long frame body is provided at both ends thereof with a round shaft sleeve which is provided in the center thereof with a recess of a predetermined depth. The recess is provided with an expanded opening. The recess is further provided in the periphery thereof with a plurality of locating holes. The fastening seat is engaged with a C-shaped ring of the shaft sleeve. The inner diameter of the fastening seat is corresponding to the outer diameter of the shaft sleeve such that their axes are aligned with the cutting bottom line of the hacksaw. The locating hole is further provided with a plurality of locating pin holes in which a locating pin and a spring are disposed pivotally. 
     As shown in FIG. 1, the hacksaw is provided with a body  10  which is provided at one end thereof with a grip  11 , and at other end thereof with an insertion portion  12  for fastening one end of a blade  13 . The blade  13  is fastened at other end thereof with the grip  11  by a screw  14 . 
     The prior art sawing machine described above has several drawbacks, which are explicitly described hereinafter. 
     The curved rod is used to adjust the horizontal cutting angle of the workpiece. The curved rod is engaged in the radial displacement, which is different from the horizontal adjustment of the long frame body. The radial motion is prone to cause the overturn of the whole set of structure and is inconsistent with the inertia motion of the mechanics of the human body. 
     The longitudinal cutting angle of the workpiece is changed mainly by the outer diametrical rotation of the fastening seat. The shaft sleeve and the fastening seat are pivoted by the locating hole and the locating pin in conjunction with the spring. It requires a precision technique to form a vertical hole along the radial direction in view of the locating hole and the locating being disposed respectively at the radial positions of the shaft sleeve and the fastening seat. As a result, the sawing machine of the prior art is not cost-effective. 
     The body  10 , the insertion portion  12 , the grip  11 , and the blade  13  are fastened in a “single point” manner such that the blade  13  is prone to become loosened to result in a sawing work of a poor quality. 
     SUMMARY OF THE INVENTION 
     The primary objective of the present invention is to provide a carpenter&#39;s sawing machine, which comprises a base which is provided with a long support body. The base is provided at the top thereof with a sectoral recess of an angle of 90 degrees and extending outwards from the pivoting place of the long support body. The sectoral recess is provided with a angle graduation in cooperation with a pointer of the long support body. The long support body is provided at one end thereof with a round urging portion which is provided radially with a dividing head seat. The urging portion and the dividing head seat are provided with a recessed portion. The dividing heat seat is provided axially with a fastening hole. An adjustment seat is provided such that the adjustment seat is opposite to the urging portion and the dividing head seat. The adjustment seat can be fitted over the dividing head seat such that the adjustment seat is joined with the C-shaped ring of the urging portion. The C-shaped opening is provided with a straight rod for fastening the hacksaw. The adjustment seat is provided axially with the graduation. The adjustment seat is provided with a fastening hole in which a ball and a spring are disposed. The ball and the spring are confined by a screw. The adjustment seat cooperates with a press plate which is provided with a fastening hole and a threaded hole. The hacksaw comprises a main body which is provided at one end thereof with a grip which is provided at the lower end thereof with a pivoting portion. The main body is provided at other end thereof with an adjustment portion. The pivoting portion and the adjustment portion are connected with the blade. The present invention is characterized by the sectoral recess whose side wall is provided with a locating slot opposite to the angle graduation. The long support body is provided with a slide slot which is provided at both ends thereof with a suspension frame. The long support body is provided with a stop recess opposite to other end of the base. The slide slot is provided with an angle locating element which is provided with a retaining block. The angle locating element is provided thereunder with a hole and a movable hole in communication with the hole. A push rod is provided with a curved portion and a straight rod extending from the curved portion. The straight rod is provided with a spring. The push rod is provided with a locating threaded hole engageable with a locating screw. The dividing head seat is provided in the periphery thereof with a groove of a special angle. The adjustment seat is provided with an insertion slot and a specially-angled hole. The press plate is provided with an insertion strip opposite to the insertion slot of the adjustment seat. The fastening hole of the press plate and the fastening hole of the dividing head seat are engaged with a fastening screw. The specially-angled hole of the adjustment seat and the threaded hole of the press plate are provided with a C-type screw which is provided at the front thereof with a threaded portion and a press rod body extending from the threaded portion and having a diameter smaller than the diameter of the threaded portion. The specially-angled hole has a depth greater than the length of the press rod body. The pivoting portion is provided with a long strip hole for disposing the blade. The main body is provided with a pivoting hole in cooperation with a pivoting element of the blade. The pivoting element is provided with an insertion portion opposite to the hole of the blade. The adjustment portion comprises a long strip hole for disposing the blade. The main body is provided in two sides thereof with a long hole which is provided in the periphery thereof with the insertion slot. The main body is provided at the front end thereof with a recessed portion. A bracing element is provided in conjunction with the insertion slot. The bracing element is provided in two sides thereof with a pivoting hole engageable with a pivoting element which is provided with an insertion portion. The bracing element is further provided with an adjustment threaded hole corresponding in location to the recessed portion and engageable with an adjustment screw. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 shows an exploded view of a carpenter&#39;s sawing machine of the prior art. 
     FIG. 2 shows an exploded view of the present invention. 
     FIG. 3 shows a partial enlarged exploded view of the present invention. 
     FIG. 4 shows a schematic view of the structure of the present invention. 
     FIG. 5 shows a partial sectional view of FIG.  2 . 
     FIG. 6 shows a partial top sectional view of FIG.  2 . 
     FIG. 7 shows a partial enlarged sectional view of FIG.  2 . 
     FIG. 8 shows a partial schematic view of FIG.  2 . 
     FIG. 9 shows a partial schematic view of FIG.  3 . 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     As shown in FIGS. 2,  3  and  4 , a carpenter&#39;s sawing machine of the present invention comprises a base  20  which is provided at the bottom thereof with a long support body  30 . The base  20  is provided at the top thereof with a sectoral recess  21  extending from the pivoting point of the long support body  30  and having an angle of 90 degrees. The sectoral recess  21  is provided with an angle graduation  211 . The long support body  30  is provided with an indicator in cooperation with the angle graduation  211 . 
     The long support body  30  is provided at one end thereof with a connecting portion  31  of a round shape. The connecting portion  31  is radially reduced to form a dividing head seat  32  which is provided in the center thereof with a recessed portion  321 . The dividing head seat  32  is provided axially with a fastening hole  322 . An adjustment seat  33  is opposite to the connecting portion  31  and the dividing head seat  32 . The adjustment seat  33  is fitted over the dividing head seat  32  such that the adjustment seat  33  is joined with the C-shaped fitting ring of the connecting portion  31 . Located at both ends of a C-shaped opening is a straight rod  331  for mounting a hacksaw. The adjustment seat  33  is provided with a graduation  332 , and a fastening hole  333  in which a ball  3331 , a spring  3332 , and a screw  3333  are disposed such that the ball  3331  and the spring  3332  are confined by the screw  3333 . A press plate  50  is provided with a locking hole  51  and a threaded hole  52 . 
     The hacksaw comprises a main body  60  which is provided at one end thereof with a grip potion  61  which is in turn provided with a pivoting portion  62 . The main body  60  is provided at other end thereof with an adjustment portion  63 . The pivoting portion  62  and the adjustment portion  63  are connected with the holes  641  of two ends of the blade  64 . 
     The sectoral recess  21  is provided in the side wall thereof with a locating slot  212  opposite to the angle graduation  211 , as shown in FIGS. 5 and 6. The long support body  30  is provided with a slide slot  34  which is provided at both ends thereof with a suspension frame  35 . The long support body  30  is provided with a stop recess  36  opposite to other end of the base  20 . An angle locating element  40  is provided with a retaining block  41  opposite in location to the locating recess  212  of the sectoral recess  21 . The angle locating element  40  is further provided with a hole  42  a hole  421  smaller in diameter than the hole  49  and a push rod  43  having a curved portion  431  which is provided with a straight body  432  extending therefrom. The curved portion  431  of the push rod  43  comes in contact with the stop recess  36  of the long support body  30 . The straight body  432  is put through the suspension frame  35 , the hole  42 , and the movable hole  421 . The straight body  432  is provided with a spring  433  which is confined between the movable hole  421  of the angle locating element  40  and the suspension frame  35  of the long support body  30 . The angle locating element  40  is provided with a locating threaded hole  422  engageable with the locating screw  423  of the push rod  43 . 
     The base  20  is provided with a slide slot  213  which is separated from the locating slot  212  by an appropriate distance, as shown in FIGS. 5 and 6. The long support body  30  is provided with a spring  38  and a steel ball  39 . In the process of horizontal adjustment of the hacksaw for adjusting the cutting angle, the spring  38  and the steel ball  39  slide in the slide slot  213  for easy adjustment in cutting angle. As shown in FIGS. 2 and 5, the push rod  43  is provided with a retaining element  434 . 
     In the process of changing the horizontal cutting position of the hacksaw, the curved portion  431  of the push rod  43  is pushed forward along the axial direction of the long support body  30 , thereby causing the angle locating element  40  to move backward along the slide slot  34  of the long support body  30 . In the meantime, the spring  433  is compressed. As a result, the retaining block  41  moves out of the locating slot  212 . The long support body  30  can be thus moved horizontally under the base  20 . As the curved portion  431  of the push rod  43  is loosened, the angle locating element  40  is forced to move backward by the elastic force of the spring  433  such that the retaining block  41  is retained in the locating slot  212  of a predetermined angle. 
     The base  20  is provided with a slide slot  213  which is separated from the locating slot  212  by an appropriate distance, as shown in FIGS. 5 and 6. The long support body  30  is provided with a spring  38  and a steel ball  39 . In the process of horizontal adjustment of the hacksaw for adjusting the cutting angle, the spring  38  and the steel ball  39  slide in the slide slot  213  for easy adjustment in cutting angle. As shown in FIGS. 2 and 5, the push rod  43  is provided with a retaining element  434 . 
     The dividing head seat  32  is provided with a plurality of the specially-angled grooves  323  for retaining the ball  3331  of the adjustment seat  33 . The adjustment seat  33  is provided with the insertion slot  37  for inserting the press plate  50 . The insertion slot  37  is provided with a plurality of the specially-angled holes  371 . The press plate  50  is provided with the insertion strip  53  engageable with the insertion slot  37 . The press plate  50  is fastened with the dividing head seat  32  by a fastening screw  511  which is engaged with the fastening hole  322  of the dividing head seat  32 . The adjustment seat  33  is fastened pivotally between the urging portion  31  and the press plate  50 , as shown in FIG.  7 . 
     In conjunction with the specially-angled hole  371  of the adjustment seat  33  and the threaded hole  52  of the press plate  50 , the threaded hole  52  is provided with a C-type screw  521 , as shown in FIG.  7 . The C-type screw  521  is provided at the front section thereof with a threaded portion  5211  which has a press rod body  5212  smaller in diameter than the threaded portion  5211 . The C-type screw  521  is engaged with the threaded hole  52  of the press plate  50  such that an axial surface  52111  of the threaded portion  5211  urges the adjustment seat  33  which in turn urges the stop portion  31  of the long support body  30 , and that the press rod body  5212  of the threaded portion  5211  in inserted into the specially-angled hole  371  of the  5211  in inserted into the specially-angled hole  371  of the adjustment seat  33 . The specially-angled hole  371  has a depth greater than the length of the press rod body  5212 . As a result, the adjustment seat  33  is located with stability and precision, as shown in FIG.  8 . 
     In the process of changing the longitudinal cutting angle of the hacksaw, the C-type screw is loosened. As the angle is adjusted, the C-type screw is inserted into the specially-angled hole. The specially-angled hole of the adjustment seat is located in the axial surface of the adjustment seat. Such a design as described above is to facilitate the molding of the device with precision. 
     The pivoting portion  62  is provided with a long strip hole  621 , which is separated from the grip portion  61  of the main body  60  of the hacksaw by an appropriate distance and is intended to receive the blade  64 . The pivoting portion  62  is further provided with a pivoting hole  622 . The blade  64  is provided with a hole  641 . The pivoting element  623  is provided with an insertion portion  6231 . The blade  64  is fastened pivotally by the pivoting element  623  which is received in the pivoting hole  622  of the pivoting portion  62  and the hole  641  of the blade  64 . 
     The adjustment portion  63  is provided with a long strip hole  631  which is separated from the main body  60  of the hacksaw by an appropriate distance and is intended to accommodate the saw blade  64 . The adjustment portion  63  is further provided with a long hole  632  which is in turn provided in the periphery thereof with an insertion slot  633 , a recessed portion  634  contiguous to the converging point of the centers of the two long holes  632 . A bracing element  635  of a U-shaped piece body is provided in two sides thereof with a pivoting hole  6351  opposite to the long hole  632 . A pivoting element  6321  is provided to cooperate with the pivoting hole  6351 , the long hole  632 , and the hole  641  of the saw blade  64 . The pivoting element  6321  is provided with an insertion portion  63211  opposite to the hole  641  of the saw blade  64 . The bracing element  635  is provided with an adjusting threaded hole  6352  opposite to the recessed portion  634  and engageable with an adjusting screw  6353 . 
     As shown in FIG. 9, the adjustment screw  6353  is fastened to press against the recessed portion  634  of the main body  60 . Thereafter, the adjustment screw  6353  is turned continually so as to cause the bracing element  635  to move backward. As the bracing element  635  is moved backward, the pivoting element  6321  is actuated to move backward in the long hole  632 . As a result, the blade  64  is braced and fastened. 
     The grip portion  61  of the main body  60  is provided in both sides thereof with a skidproof block  65  to facilitate the holding of the main body  60 .