Abstract:
A push-pull power tool. The push-pull power tool includes a table, a carriage configured to move along the table in a linear direction, a cutting assembly carried by the carriage, and a bevel adjustment arrangement configured to pivot the cutting assembly relative to the table, the bevel adjustment arrangement including an actuator, wherein the actuator is configured to remain substantially stationary in the linear direction when the carriage is moved a substantial distance in the linear direction.

Description:
FIELD  
       [0001]    The invention relates to a bench-type power tool, and in particular to a push-pull power tool. 
       BACKGROUND  
       [0002]    Bench-top power tools come in a variety of different designs. In most cases, a bench-top power tool includes a frame or a housing which includes a top portion for supporting a workpiece (e.g., a piece of wood) and a shaping tool (e.g., a saw assembly) with a blade. The shaping tool is positioned above the top portion for shaping the workpiece (e.g., cutting the workpiece). The shaping tool is generally supported by a support member (e.g., a carriage). 
         [0003]    Bench-top power tools may be divided into two categories. In a first category the shaping tool is not moveable (i.e., stationary) along an axial direction parallel to a length of the frame. An operator of the power tool moves the workpiece toward the shaping tool in order to shape the workpiece. In a second category, the shaping tool is moveable and the operator moves the shaping tool toward the workpiece. The support member, in the second category, is generally coupled to sliding members (e.g., tracks) to move the support member relative to the top portion. 
         [0004]    Bench-type power tools with moveable shaping tools provide certain advantages. For example, the operator may fix the workpiece to the top portion with fixing members (e.g., clamps) which may result in an easier shaping operation in cases where the workpiece is large (e.g., a sheet of plywood). The operator can grasp a gripping member (e.g., a knob) that is connected to a rod that is coupled to the shaping tool and slide the shaping tool forward toward a front portion of the power tool, in order to shape the workpiece. 
         [0005]    Most bench-top power tools are also designed to provide adjustability of the shaping tool with respect to the top portion, which in turn provides adjustability with respect to the workpiece. For example, the shaping tool may be adjustable to provide a bevel shaping angle. The adjustments are performed by adjustment controls (e.g., knobs or levers). The operator may desire to adjust the bevel angle of the shaping tool to a predetermined angle, or alternatively, adjust the bevel angle by visually inspecting the bevel angle of the shaping tool with respect to the workpiece. 
         [0006]    The adjustment controls of the push-pull saws of the prior art are coupled to the shaping tool and slide with the shaping tool with respect to the top portion and the frame or the housing. As a result, the controls may be unreachable by the operator when the shaping tool is in a position that is far from the operator. 
         [0007]    In the case where the operator desires to adjust the bevel angle to a predetermined angle, the bevel angle adjustment control may be completely under the bench when the shaping tool is remote from the operator. In such a situation the operator may inconveniently need to reach under the bench and make the desired adjustments. Alternatively, the operator may need to slide the shaping tool so that the adjustment controls are reachable. In either case, the operator may be inconvenienced. 
         [0008]    In the case where the operator desires to visually change the bevel angle of the shaping tool with respect to the workpiece, the operator may be excessively inconvenienced. In this situation, the operator may be required to follow a cumbersome procedure. In particular, the operator may be required to push the shaping tool toward the back portion of the bench, place the workpiece on the top portion, and inspect the bevel angle of the blade with respect to the workpiece. If the angle is incorrect, the operator may be required to remove the workpiece, slide the shaping tool toward the front portion of the bench in order to be able to reach the bevel angle control, adjust the angle, and repeat the aforementioned angle-adjustment procedure. 
         [0009]    Therefore, while adjusting the bevel angle of the shaping tool with the workpiece remaining on the top portion of the bench may be possible by the operator reaching the bevel angle control that may be located under the bench, such an adjustment is inconvenient for the operator. Therefore, there is a need to be able to adjust the bevel angle of a bench-type push-pull shaping tool in a convenient manner. 
       SUMMARY  
       [0010]    According to one embodiment of the present disclosure, there is provided a push-pull power tool. The push-pull power tool includes a table, a carriage configured to move along the table in a linear direction, a cutting assembly carried by the carriage, and a bevel adjustment arrangement configured to pivot the cutting assembly relative to the table, the bevel adjustment arrangement including an actuator, wherein the actuator is configured to remain substantially stationary in the linear direction when the carriage is moved a substantial distance in the linear direction 
         [0011]    According to another embodiment of the present disclosure, there is provided a push-pull table saw. The push-pull table saw includes a table, a carriage configured to move along the table in a linear direction, a cutting assembly carried by the carriage, and a bevel adjustment arrangement configured to pivot the cutting assembly relative to the table, the bevel adjustment arrangement including an actuator, wherein the actuator is configured to remain substantially stationary in the linear direction when the carriage is moved a substantial distance in the linear direction, and a height control member coupled to the saw assembly and configured to move the blade parallel to a second axis along the height of the housing in response to movement of the height control member, wherein the bevel control member remains vertically stationary during movement of the blade parallel to the second axis 
         [0012]    According to yet another embodiment of the present disclosure, there is provided a push-pull saw. The push-pull saw includes a carriage configured to movably support a saw assembly, a push-pull rod coupled to the carriage and operable to move the carriage in a linear path of movement in response to the push-pull rod being moved in the linear path, and a bevel control rod coupled to the carriage and operable to move the saw assembly in a bevel path defined within a plane substantially perpendicular to the linear path in response to rotation of the bevel control rod, wherein the bevel control rod remains axially stationary during movement of the push-pull rod and the carriage in the linear path. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]      FIG. 1  depicts a perspective view of a push-pull table saw with a top portion and with an axially fixed bevel angle adjustment knob and a height adjustment control knob; 
           [0014]      FIG. 2  depicts a fragmentary perspective view of a carriage including a pair of sliding brackets capable of sliding on two sliding members, and a carrier configured to support a saw assembly and an accompanying blade shown above the top portion of the push-pull table saw of  FIG. 1 ; 
           [0015]      FIG. 3  depicts a plan view of one of the two sliding brackets shown in  FIG. 2  coupled to the sliding members and to apportion of the carrier; 
           [0016]      FIG. 3A  depicts an enlarged portion of  FIG. 3  showing an angular engagement between a splined shaft and a toothed arc; 
           [0017]      FIG. 4  depicts a fragmentary perspective view of a sliding mechanism according to one embodiment of the present disclosure; 
           [0018]      FIG. 5A  depicts a simplified perspective view of the push-pull table saw of  FIG. 1  with a push-pull rod coupled to the saw assembly in a first position; 
           [0019]      FIG. 5B  depicts a simplified perspective view of the push-pull table saw of  FIG. 1  with the push-pull rod coupled to the saw assembly in a second position; 
           [0020]      FIG. 6  depicts a perspective view of a push-pull table saw according to another aspect of the present disclosure including a keyed shaft, a bearing assembly, and a geared interface for providing a bevel function; and 
           [0021]      FIG. 7  depicts a fragmentary cross sectional view of a bearing assembly of the geared interface of  FIG. 6 . 
       
    
    
     DESCRIPTION  
       [0022]    For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings and described in the following written specification. It is understood that no limitation to the scope of the invention is thereby intended. It is further understood that the present invention includes any alterations and modifications to the illustrated embodiments and includes further applications of the principles of the invention as would normally occur to one of ordinary skill in the art to which this invention pertains. 
         [0023]    While a push-pull table saw is depicted in the figures of the present disclosure, it should be understood that the present disclosure applies to other types of push-pull bench-type power tools. For example, the present disclosure can also apply to a push-pull router that is coupled to a bench. Therefore, where a power saw or a saw assembly is referenced, it should be appreciated that other power tools, such as a router, may be substituted for the power saw. 
         [0024]      FIG. 1  depicts a push-pull table saw  100 . The push-pull table saw  100  includes a table  102 , a height adjustment arrangement  129  and a bevel angle adjustment arrangement  133 . The push-pull saw  100  further includes a carriage  200  ( FIG. 2 ), and sliding members in the form of tracks  246  and  248  ( FIG. 2 ). Also, the push-pull saw  100  includes a saw assembly  230  ( FIG. 2 ). 
         [0025]    The table  102  includes a table top  104 , a front portion  106 , and a rear portion  108 . The table  102  can be formed in a shape of an enclosed housing, or as shown in  FIG. 1  in an open form. The table top  104  is in a shape of a rectangle and includes an elongated opening  110  formed along the length of the table top  104 . The front portion  106  includes a front plate  107  and legs  112 . The rear portion  108  includes a rear plate  109  and legs  113 . A power switch  114  is mounted on one of the legs  112  of the front portion  106  (as depicted in  FIG. 1 ) or may be mounted to the front plate  107 . Cross brackets  116  are coupled between the legs  112  in the front portion  106  and the legs  113  in the rear portion  108 . A cross bracket  117  connects legs  112  and  113  of the front and rear portions  106  and  108 , respectively. 
         [0026]    The saw assembly  230  ( FIG. 2 ) is located under the table top  104  of the table  102 . The saw assembly  230  is configured to move in a linear direction relative to the table  102  when a push-pull rod in the form of a shaft  130  is moved in the linear direction. A saw blade  120  which is coupled to the saw assembly  230  is positioned above the table top  104 , as depicted in  FIG. 1 . The saw blade  120  extends through the opening  110  and is capable of sliding along the length of the opening  110 . A riving knife assembly  122  is also depicted in  FIG. 1 . The riving knife assembly  122  is connected to the saw assembly  230  and is configured to move with the saw blade  120 . The riving knife assembly  122  provides a riving function by a riving knife disposed behind the saw blade  120 , a protective function by a blade protective cover disposed above the saw blade  120 , and a vacuum function to remove debris and wood particles from the surroundings of the saw blade  120  by a vacuum hose connection disposed to the rear of the saw blade  120 . 
         [0027]    The height adjustment arrangement  129  includes the shaft  130  connected to an actuator in the form of a height adjustment control knob  132 . The shaft  130  extends through an arcuate opening  138  formed in the front portion  106  on the front plate  107 . 
         [0028]    The height adjustment control knob  132  is connected to the shaft  130  and provides a push-pull function as well as a rotational function. Therefore, linear movement of the height adjustment control knob  132  from a position near the front plate  107  to a position remote from the table  102 , results in a linear movement of the saw assembly  230  along a linear path from a position near the back portion  108  to a position near the front portion  106 , respectively. As a result, linear movement of the height adjustment control knob  132  results in a linear movement of the blade  120  from a position near the back portion of the opening  110  to a position near the front portion of the opening  110 . 
         [0029]    In addition to linear movement of the height adjustment control knob  132 , the knob  132  can also be rotated. The shaft  130  is coupled to the saw assembly  230  ( FIG. 2 ). The blade  120  is operated by the saw assembly  230  for cutting the workpiece. Rotating the height adjustment control knob  132  turns the shaft  130 . Rotation of the shaft  130 , as will be explained in greater detail below, results in adjusting height of the blade  120  extending above the table top  104 . 
         [0030]    The bevel angle adjustment arrangement  133  includes a bevel angle adjustment knob  134  connected to a bevel control rod  137  and which extends through an optional bushing  136  affixed to the front plate  107 . The bevel control rod  137  is a rod that can be fully or partially formed in the form of a splined shaft. The bushing  136  may be configured to provide a rotational locking feature for the splined shaft  137  utilizing a ratchet and a pawl arrangement known to one of ordinary skill in the art. The bevel control rod  137  extends the length of the table  102  to an optional complementary bushing (not shown) on the rear plate  109 . 
         [0031]    The bevel angle adjustment knob  134  is axially fixed with respect to the front plate  107 , i.e., the bevel angle adjustment knob  134  does not move along a linear path parallel to the length of the table  102 . However, the bevel angle adjustment knob  134  is rotationally moveable. As will be described in greater detail below, rotating the bevel angle adjustment knob  134  causes rotation of the bevel control rod  137  which causes rotation of the saw assembly  230  with respect to the table top  104  which provides a desired bevel angle for the blade  120 . Therefore, the bevel control rod  137  that is coupled to a pivotable mount in the form of a carrier  220 , to which the saw assembly  230  is mounted ( FIG. 3 ), is operable to rotate the carrier  220  and with it the saw assembly  230  and the blade  120  in a bevel path defined within a plane that is substantially perpendicular to the linear path of the blade  120 . 
         [0032]    Since the shaft  130  and the height adjustment control knob  132  are coupled to the saw assembly  230 , rotating the bevel angle adjustment knob  134  also causes movement of the height adjustment control knob  132  and the shaft  130  along an arcuate path with respect to the front plate  107  and defined by the arcuate opening  138 . The arcuate opening  138  is, therefore, provided on the front plate  107  to provide sufficient space for the shaft  130  to move in response to rotation of the bevel angle adjustment knob  134 . 
         [0033]      FIG. 2  depicts the carriage  200 . The carriage  200  includes sliding brackets  202  and  204  that are coupled to the sliding members  246  and  248 . The sliding members  246  and  248  may be extended along the entire length of the table  102 , and be connected to the front and rear plates  107  and  109 . Alternatively, the sliding members  246  and  248  may be extended partially along the length of the table  102  and be connected to the underside of the table top  104 . The sliding brackets  202  and  204  are connected to each other by a bottom plate  206 . 
         [0034]    The carriage  200  also includes a pivotable mount in a form of the carrier  220 . The carrier includes side walls  222  and  224  and a bottom plate  226  for connecting the side walls  222  and  224  and for supporting the saw assembly  230  which is connected to the bottom plate  226 . 
         [0035]    A portion of the shaft  130  is shown in  FIG. 2 . The shaft  130  extends through an arcuate opening  244  formed in the sliding bracket  202 . Also shown in  FIG. 2  is a portion of the bevel control rod  137 . The bevel control rod  137  is optionally coupled to a bushing  242  mounted on the sliding bracket  202 . As described above, the bevel control rod  137  includes splines that fully or partially extend the length of the bevel control rod  137 . Splines of the bevel control rod  137  engage toothed arcs in the form of gear teeth  250  ( FIG. 3 ) which are mounted to the side walls  222  and  224 , discussed in greater detail below. 
         [0036]      FIG. 3  depicts a partial cross sectional view of a section of the push-pull table saw  100  about a line identified as III-III in  FIG. 2 . Depicted in  FIG. 3  is the sliding bracket  202 . Also depicted in  FIG. 3  are the side wall  222  and the bottom plate  226  of the carrier  220 . While only one sliding bracket ( 202 ) and one side bracket ( 222 ) are depicted in  FIG. 3 , it should be understood that a similar arrangement exists for the sliding bracket  204  and the side wall  224 . As described above, and more clearly depicted in  FIG. 3 , the saw assembly  230  is supported by the bottom plate  226 . The blade  120  extends through the opening  110  and through a corresponding opening  205  formed in the top plate  205 . The gear teeth  250  are formed on the side wall  222  and interface with splines of the bevel control rod  137 . The gear teeth  250  can be integrally formed with the side wall  222  or alternatively mounted onto the side wall  222 . 
         [0037]    The sliding bracket  202  slidably interfaces with the sliding members  246  and  248  by complementary sliding members  252  and  254 , respectively. The sliding interfaces  246 / 252  and  248 / 254  are further described below in reference to  FIG. 4 . 
         [0038]    Since the side wall  222  and the bottom plate  226  are connected, rotating the bevel angle adjustment knob  134  causes rotation of the bevel control rod  137  which causes rotation of the side wall  222  which causes rotation of the bottom plate  226 . Rotation of the bottom plate causes rotation of the saw assembly  230  which causes beveling of the saw blade  120 . The ends of the arcuate opening  244  may be used to provide limits for how far the carrier  220  can rotate. 
         [0039]    While the splined interface between the gears  250  and the splines of bevel control rod  137  provide the rotational movement for the carrier  220 , the same splined interface can also provide a sliding interface. Once the desired rotational position has been reached (i.e., the bevel angle), the carriage  200  can be slidably moved from the position near the rear portion  108  to the position near the front portion  106 , and vice versa. The complementary sliding members  246 / 252  and  248 / 254  provide the axial sliding interface of the sliding bracket  202  with respect to the table top  104 .  FIG. 3A  depicts an enlarged portion of  FIG. 3 , encircled and indentified as IIIA, which depicts the interface between the splined shaft  137  and the toothed arc with gear teeth  250 . Rotation of the splined shaft  137  in a direction identified as AA causes movement of the toothed arc in a direction identified as BB. 
         [0040]      FIG. 4  depicts a fragmentary perspective view of complementary sliding interfaces  248 / 254  encircled in  FIG. 3  and identified as IV. It should be understood that a similar sliding interface also exists for the sliding members  246 / 252 . Also, a set of complementary sliding interfaces  248 / 254  and  246 / 252  exist for the sliding bracket  204 . As described above, the sliding member  248  may be configured to extend substantially the length of the table  102 . The complementary sliding member  254 , however, is a short member connected to the sliding bracket  204 . The sliding member  254  includes ball bearings  280  which are encapsulated in partial cavities formed by flare-outs  284  and  288 . The ball bearings  280  also interface with partial cavities formed on the sliding member  248  by flare-ins  282  and  286 . 
         [0041]    As explained above, the shaft  130  is utilized to both slide the carriage  200  along the length of the table  102  as well as to adjust the height of the blade  120  with respect to the table top  104 . The shaft  130  is coupled to the saw assembly  230 . While pulling and pushing of the shaft  130  forces the saw assembly  230  and consequently the carriage  200  to slide, rotating the shaft  130  causes the blade  120  to raise and lower with respect to the table top  104 . However, only the blade  120  moves up and down and not the saw assembly  230 . In other words, the carrier  220  and the carriage  200  are stationary in the vertical direction. 
         [0042]    In operation, the operator of the push-pull table saw  100  can push the height adjustment control knob  132  to move the carriage  200  including the carrier  220  to the position near the rear portion  108 . The operator can then place a workpiece on the table top  104  and position the workpiece next to the blade  120 . The operator can adjust the bevel angle of the blade  120  by rotating the bevel angle adjustment knob  134  and bevel control rod  137  by releasing the optional pawl from a splined portion of the bevel control rod  137 . Regardless of the position of the carriage  200 , the bevel angle adjustment knob  134  is advantageously disposed at the front portion of the push-pull table saw  110 . Rotation of the bevel control rod  137  causes rotation of the carrier  220  with respect to the surface of the table top  104  which causes beveling of the saw blade  120  with respect to the table top  104 . Once the desired bevel angel has been reached, the operator can turn on the saw assembly  230  by activating the power switch  114 , and pulling the carriage  200  to the position near the front portion  106  in order to cut the workpiece at the desired bevel angle. Similarly, the operator can adjust the bevel angle of the blade  120  when the carriage  200  is at the position near the front portion of the push-pull saw  100 . 
         [0043]      FIG. 5A  depicts a simplified perspective view of the push-pull table saw  100  of  FIG. 1 , in a first position. The saw blade  120  and the riving knife assembly  122  are slidably provided in the elongated opening  110  and the two are coupled to a carriage (not shown) which is also coupled to the shaft  130  and to the height adjustment control knob  132 . As depicted in  FIG. 5A , in the first position, the saw blade  120  and the riving knife assembly  122  are pushed back to a rearward end of the elongated opening  110  in response to the height adjustment control knob  132  being completely pushed inwardly. The bevel angle adjustment knob  134  is positioned in a first position as depicted in  FIG. 5A . 
         [0044]      FIG. 5B  depicts the simplified perspective view of the push-pull table saw  100  of  FIG. 5A  in a second position. In the second position, the saw blade  120  and the riving knife assembly  122  are pulled forward to the opposite end of the elongated opening  110  as compared to  FIG. 5A  in response to the height adjustment control knob  132  being completely pulled outwardly. The bevel angle adjustment knob  134 , however, remains in the same position as that depicted in  FIG. 5A . 
         [0045]    While the embodiment of the push-pull table saw  100  described above uses a bevel control rod  137  that is partially or fully splined, another embodiment of a push-pull saw is described below.  FIG. 6  depicts a perspective view of another embodiment of a push-pull table saw  300 . For added clarity, only internal structures of the push-pull table saw  300  are depicted. Therefore, while the push pull table saw  300  may include a table (not shown) similar to the table  102  depicted in  FIG. 1  or a housing (not shown) that is formed around the internal structures, these outside structures are not shown for added clarity. The push-pull table saw  300  includes a table top  304  with an elongated opening  310  formed thereon, a bevel adjustment mechanism  333  and a height adjustment-push pull mechanism  329 . A blade  320  attached to a saw assembly (not shown) extends through the elongated opening  310 . The blade  320  is depicted in a beveled angle with respect to the table top  304 . The bevel adjustment mechanism includes a knob  333  and a keyed shaft  337  attached thereto (more clearly depicted in  FIG. 7 ). The height adjustment-push pull mechanism  329  also includes a knob  332  and a rod  330 . Included in the table saw  300  is also a carriage  400  and a pivotable mount in the form of a carrier  420 . 
         [0046]    The carriage  400  includes sidewalls  402  and  404  and an optional bottom member  406 . An arcuate opening  444  is formed in the side wall  402  of the carriage  400  allowing for passage of the rod  330  and for arcuate movement of the rod  330 . Similarly, opening  445  are formed in the side walls  402  and  404  allowing for passage of the keyed shaft  337 . The keyed shaft  337  is coupled to the handle  334  and is configured to rotate in response to rotation of the handle  334 . While the keyed shaft  337  is depicted to pass through openings  445  disposed on the side walls  402  and  404 , bearing assemblies (not shown) mounted on the side walls  402  and  404  can also be provided to provide additional support for the keyed shaft  337 . The keyed shaft  337  is depicted to extend beyond the carriage  400  on both sides of the carriage  400 . The keyed shaft  337  can be configured to extend to the outside structures (not shown) such as the housing (not shown). Sliding members  446  and  448  are attached to the bottom side of the table top  304 . The side walls  402  and  404  slidably interface with the sliding members  446  and  448  by complementary sliding members (not shown), similar to the sliding interfaces  246 / 252  and  248 / 254  depicted in  FIG. 4 . 
         [0047]    While the rod  330  is allowed to move with respect to the carriage  400  about an arcuate path defined by the arcuate opening  444 , the rod  330  is axially fixed with respect to the carriage. Therefore, pulling and pushing of the knob  332  causes the carriage  400  to slidably engage with the sliding members  446  and  448  and thereby cause the carriage to move from left to right and vice versa with respect to  FIG. 6 . 
         [0048]    The push-pull table saw  300  also includes a carrier  420  for supporting the saw assembly (not shown). The carrier  420  is positioned within the carriage  400  and is axially fixed with respect to the carriage  400 . The carrier  420  includes side walls  422  and  424  and a bottom support surface  426 , configured to support the saw assembly (not shown). The carriage  420  includes a bearing assembly  410  (depicted in  FIG. 7 ) for receiving the keyed shaft  337  and thereby causing tilting of the carrier  420  with respect to the carriage  400  about an arrow  449 . As a result of rotation of the knob  334 , the carrier  420  is depicted in a tilted position in  FIG. 6  such that distal end of the carrier (i.e., the end closer to the rod  330 ) is positioned higher (i.e., closer to the table top  304 ) than the proximal end of the carrier  420  (i.e., the end closer to the keyed shaft  337 ). 
         [0049]      FIG. 7  depicts a fragmentary cross sectional view of the bearing assembly  410 , encircled in  FIG. 6  and identified as VII. The bearing assembly  410  includes an outer portion  423  which is fixedly coupled to the side wall  422 . The bearing assembly  410  also includes an inner portion  425  which rotationally interfaces with the outer portion  423 . Two bearing members  450  and  452  interface with the keyed shaft  337  and thereby allow the keyed shaft  337  to slide with respect to the side wall  422 , and therefore with respect to the carrier  420  and carriage  400 . However, due to the configuration of the keyed shaft  337  and the bearing members  450  and  452 , rotation of the keyed shaft causes a corresponding rotation of the inner portion  425 . 
         [0050]    The inner portion  425  includes gears  454  which interface with toothed arcs in the form of gears  456 . Gears  456  are fixedly mounted or integrated with the side wall  422 . Therefore, rotation of the keyed shaft  337 , which as described above, causes rotation of the inner portion  425  of the bearing assembly  410 , causes rotation of the side wall  422  which causes rotation of the carrier  420  within the carriage  400 . These corresponding rotations are noted in  FIG. 7  by arrows  460  and  461 . 
         [0051]    In operation, the operator of the push-pull table saw  300  adjusts the height adjustment-push pull mechanism  329  in order to achieve the desired height for the blade  320 . The operator then rotates the knob  334  in order to rotate the keyed shaft  337 . Rotation of the keyed shaft  337  rotates the inner portion  425  of the bearing assembly  410 . Rotation of the inner portion  425  causes rotation of the gears  454  which rotate gears  456  of the side wall  422 . The rotation of the side wall  422  causes rotation of the carrier  420  with respect to the carriage  400  thereby causing the beveling of the saw assembly (not shown) which causes beveling of the saw blade  320  with respect to the table top  304 . 
         [0052]    Once the correct height and bevel angle of the blade  320  are achieved, the operator pushes and pulls the height adjustment-push pull mechanism  329  in order to slide the carriage  400 , the carrier  420  and therefore the saw assembly (not shown) and the blade  320  back and forth in order to make the desired cut of the workpiece. The bearing members  450  and  452  rotate on the keyed shaft  337  as the carriage  400  is pushed and pulled in response to the movement of the height adjustment-push pull mechanism  329 . 
         [0053]    While the geared interface between the gears  454  and  456  is depicted in  FIG. 7  to have substantially similar profiles, the gears may be defined by different pitches and diameters resulting in the inner portion  425  to rotate at a different relative rotational speed than the gears  456 . Also, intermediate gears may be used between the gears  454  and  456  to further change rate of rotation of the carriage  420  as compared to rate of rotation of the knob  334 . 
         [0054]    While the invention has been illustrated and described in detail in the drawings and foregoing description, the same should be considered as illustrative and not restrictive in character. It is understood that only the preferred embodiments have been presented and that all changes, modifications and further applications that come within the spirit of the invention are desired to be protected.