Patent Publication Number: US-RE41320-E

Title: Pivotable handle and angle adjustable device for miter saw

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       Co - pending application Ser. No.  11 / 522 , 505  is a continuation of the present application.    
    
    
     FIELD OF THE INVENTION 
     The present invention relates to a miter saw wherein the angle of the handle connected to the circular saw assembly is adjustable and the bench of the miter saw can be pivoted and positioned at desired angle. 
     BACKGROUND OF THE INVENTION 
     A conventional miter saw is shown in FIG.  8  and generally includes a base  60  with a disk  65  connected thereon and scale marks are marked on the disk  65 . A circular bench  62  is pivotally supported on the disk  65  and a handle  631  extends from the bench  62 . A position device  63  is connected to the handle  631  and has a position member  632  which is engaged with one of notches  651  defined in an underside of the disk  65  so that the bench  62  can be pivoted and positioned at desired angle. A connection member  64  is connected to the bench  62  so that the circular saw assembly  70  is pivotally connected to the connection member  64 . The circular saw assembly  70  has a blade  74  which is driven by a motor  71  and an arm  72  is connected to a shaft of the blade  74 . A handle  73  is connected to the arm  72 . A fence  61  is located on the bench  62  so that an object to be cut is guided on the fence  61 . The bench  62  can only be positioned at certain angles where notches  651  are available and it is difficult to set the bench  62  at an angle where no notch  651  is available. The user has to hold the handle  631  firmly to maintain the position of the bench  62  and lower the blade  74  to check the object will be cut at desired position. Besides, the handle  73  is fixed so that it cannot be satisfied by different users. 
     SUMMARY OF THE INVENTION 
     The primary object of the present invention is to provide a miter saw which has a handle that is rotated and positioned at a desired angle so as to meet different users&#39; needs. 
     Another object of the present invention is to provide a miter saw which has a position member connected to the angle position device, wherein the position member is pushed by operating a lever to contact against a periphery of the scale disk to position the scale disk. 
     The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view to show the miter saw of the present invention; 
         FIG. 2  is a perspective view to show the angle adjustable handle on the circular saw assembly of the miter saw of the present invention; 
         FIG. 3  is an exploded view to show the angle adjustable handle on the circular saw assembly of the miter saw of the present invention; 
         FIG. 4  is an exploded view to show the angle adjustable handle on the circular saw assembly of the miter saw of the present invention from another position; 
         FIG. 5  is a perspective view to show the angle position device of the miter saw of the present invention; 
         FIG. 6  is a side view to show that the position member of the angle position device is not pushed; 
         FIG. 7  is a side view to show that the position member of the angle position device is pushed by lifting the lever, and 
         FIG. 8  is a perspective view to show a conventional miter saw. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIGS. 1  to  4 , the miter saw of the present invention comprises a base  10  and a scale disk  16  is fixedly connected to the base  10 . A bench  11  is rotatably connected on the disk  16  and an angle position device  14  is connected to the bench  11  from an underside of the bench  11 . A fence  12  is located on the bench  11  so as to guide an object to be cut on the bench  11 . A plurality of notches  161  defined in an underside of the scale disk  16  at positions where pre-chosen marks of angles are located. The angle position device  14  is engaged with one of the notches  161 . 
     A connection member  13  is connected to the bench  11  and a circular saw assembly  20  is pivotally connected to the connection member  13  by an arm  21  connected therebetween. The circular saw assembly  20  includes a motor  22  and a circular blade  23  which is driven by the motor  22 . A block  50  is fixedly connected to the arm  21  and a first connection port  53  is located on an end of the block  50 . A recessed area  532  is defined in a surface of the first connection ports  53 . A first central hole  531  is defined through an inside of the recessed area  532  and a plurality of concavities  533  are defined in the inside of the recessed area  532 . 
     A rectangular handle  40  composed of two halves  41 ,  42  has a second connection port  43  which has a protrusion  433  extending from a first surface thereof. The protrusion  433  is removably engaged with the recessed area  532  and a second central hole  431  is defined through the protrusion  433  and the second connection port  43 . A plurality of rods  435  extend from the protrusion  433  and are engaged with the concavities  533 . The number of the concavities  533  is more than the number of the rods  435 . A groove  534  is defined in the surface of the connection port  53  and a position tube  434  extends from the first surface of the second connection port  43 . The position tube  434  is movably received in the groove  534  so that the second connection port  43  is restricted to be rotated a limited angle relative to the first connection port  53  because the groove  534  limits the range of movement of the position tube  434 . 
     An engaging recess  44  is defined in a second surface of the second connection port  43  and a seat member  45  is received in the engaging recess  44 . A passage  451  is defined through the seat member  45  and communicates with the second central hole  431 . A flange  452  extends from a periphery defining the passage  451 . A pin  47  extends through the passage  451 , the second central hole  431  and the first central hole  531 . A clamp  474  is engaged with a groove  472  defined in a distal end of the pin  47  so as to prevent the pin  47  from dropping from the first central hole  531 . A spring  46  is mounted to the pin  47  and biased between the flange  452  and a head  471  of the pin  47 . A thread hole  473  is defined in the head  471  of the pin  47  and the head  471  of the pin  47  is sized to be movably received in the passage  451 . A locking member  48  has a section  482  and an eccentric hole  480  is defined through the locking member  48  and the section  482 . A bolt  481  extends through the eccentric hole  480  and is engaged with the thread hole  473 . The locking member  48  is freely rotated about the bolt  481  and the section  482  is sized to be inserted in the passage  451 . An eccentric convex surface  483  extends from a distal end of the section  482  and the eccentric convex surface  483  contacts the head  471  of the bolt  47 . 
     When rotating a handlebar on the locking member  48  to a locking position, because the eccentric hole  480  is located eccentrically in the section  482  so that a central axis of the section  482  is shifted away from a central axis of the passage  451  and the pin  47 . The highest point of the eccentric convex surface  483  firmly urges the head  471  of the pin  47  so that the handle  40  cannot be pulled away from the block  50  because the seat member  45  is stopped by the section  482 . On the contrary, when rotating the locking member  48  to an unlock position, the central axis of the section  482  is shifted to coincide with the central axis of the passage  451  and the pin  47 . The peak point of the eccentric convex surface  483  is then removed from the head  471  of the pin  47  so that the handle  40  can be pulled away from the block  50  and the head  471  of the pin  47  and the section  482  are both received in the passage  451  as the seat member  45  is moved with the handle  40 . The handle  40  is then able to be rotated an angle to let the rods  435  remove from the concavities  533  wherein the rods  435  were engaged to other concavities  533 . By this way, the angle of the handle  40  can be adjustable. 
     Referring to  FIGS. 5  to  7 , the angle position device  14  has a position member  143  which vertically and movably extends through a body  141  of the angle position device  14  and a tongue  1430  is connected to the position member  143 . The tongue  1430  can be lowered to disengage from one of the notches  161  when pushing the position member  143  when holding a handle  17  to rotate the bench  11 . A point plane  142  is connected to the body  141  so as to provide an index mark to the scale disk  16 . A scale disk holding device  15  is connected to the body  141  and includes a lever  151  pivotally connected to a body  141  of the angle position device  14 . An eccentric portion  152  extends from an end of the lever  151  and a mediate member  153  is pivotally connected to the eccentric portion  152 . A support member  155  is connected to the body  141  of the angle position device  14  and a position rod  154  movably extends through the support member  155 . An end of the position rod  154  is pivotally connected to the mediate member  153  and the other end of the position rod  154  has a rubber end. A cover  157  is connected to the body  141  and encloses the connection between the position rod  154 , the mediate member  153  and the lever  151 . 
     When the lever  151  is not lifted, and rubber end of the position rod  154  does not contact the scale disk  16  as shown in FIG.  6 . As shown in  FIG. 7 , when lifting the lever  151 , the eccentric portion  152  pushes the position rod  154  to let the rubber end contact the periphery of the scale disk  16  and hold the scale disk  16 . Therefore, the bench  11  can be rotated to any desired angle without engaging the tongue  1430  with the the notch  161 . 
     While we have shown and described the embodiments in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.