Abstract:
A structure of handle for mini-handsaw includes a handle having a gap to engage a saw blade therein, a slider in cooperation with a locking member slidably engaged within a rectangular opening of the handle for releasably gripping the inner end of the blade and a swivel arrester fastening the middle portion of the blade through a slot and a depression of the handle. This handle is characterized in a convenient embedment or disengagement of the saw blade and the engagement is very stable.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to handicraft tools and more particularly to a structure of handle for mini-handsaw which provides a convenient engagement or disengagement of the saw blade within the handle and the engagement is very stable. 
     A prior art mini-handsaw  10  (as shown in FIG. 1) comprises a handle  11 , a longitudinal slit  12  in the handle  11  extended along the length thereof, a bowed frame  13  integrated with the front end of the handle  11  including a through hole  131  in free end. When a saw blade  14  inserts into the slit  12  of the handle  11 , its outer end is fixed by a bolt  16  and a hexagonal looking plate  15 . This mini-handsaw  10  has a disadvantage. Each time fastening or unfastening the looking plate  15  must use a tool and due to the unstable fastening manner, the saw blade  14  may be loosened often. So that the operator has to fasten the looking plate  15  repeatedly, causing great inconvenience to the operator. 
     SUMMARY OF THE PRESENT INVENTION 
     The present invention has a main object to provide a structure of handle for mini-handsaw in which the saw blade is readily to assemble or disassemble into the handle without using a tool. 
     Another object of the present invention is to provide a structure of handle for mini-handsaw which has two fixed points to hold the saw blade so that the engagement of the saw blade within the handle is very stable. 
     Further object of the present invention is to provide a structure of handle for mini-handsaw in which the saw blade is slidable in the handle in order to adjust the outside length of the saw blade. 
     Accordingly, the structure of handle for mini-handsaw of the present invention comprises generally a hollow interior handle combined with a pair of first and second halves so as to define an elongate slit therein for receiving the inner pat of a saw blade, a slider, a locking member and a swivel arrester. The handle has a plurality of transverse grooves and a plurality of guides formed in inside walls and extended along the length thereof. The slider connected with the locking member slidably engaged within a rectangular opening of the handle wherein the locking member has a blade holder for holding the inner end of the saw blase and the slider has a stopper for selectively engaging into one of the transverse grooves. The swivel arrester has a T-shaped lock for fixing the saw blade at a front end of the handle. When pulls the locking member rearward relative to the handle, an inner sliding plate forces the stopper of the slider engaged into one of the vertical positioning grooves so as to restrain the longitudinal movement of the saw blade. If presses the press block of the locking member inward, the saw blade can be able to disengaged with blade holder and sets free to draw out of the handle. 
     The present invention will become more fully understood by reference to the following detailed description thereof when read in conjunction with the attached drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a plane view to show a mini-handsaw according to a prior art, 
     FIG. 2 is an exploded perspective view to show a mini-handsaw of a preferred embodiment according to the present invention, 
     FIG. 3 is a perspective view to show the assembly of FIG. 2, 
     FIG. 4 is a sectional view to show a pair of hooks of the locking member hooked a pair of semi-circular concaves of the slider, 
     FIG. 5 is a sectional view a blade holder of the locking member engaged with a circular hole of the saw blade, 
     FIG. 6 is a vertical section indicating the slider and the locking member engaged within the handle, 
     FIG. 7 is a sectional view to show that the slider is able to slide in the handle, 
     FIG. 8 is a sectional view to show that the slider is unable to slide in the handle, 
     FIG. 9 is a sectional view to show that the press block is pushed inward, 
     FIG. 10 is a sectional view to show that the swivel arrester is at a loose position, 
     FIG. 11 is a sectional view to show that the swivel arrester is at fastening position, and 
     FIG. 12 is a perspective view to show an alternate embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     With reference to the drawings and initialed from FIGS. 2 and 3, the structure of handle for mini-handsaw of the present invention comprises a hollow interior handle  20 , a slider  30 , a locking member  40 , a swivel arrester  50  and a saw blade  60 . 
     The handle  20  is combined with a first and a second halves  21  and  22  and secured by a plurality of bolts  23 , a gap is defined between the two halves  21  and  22  for permitting the saw blade  60  to insert into the handle  20 . The first half  21  has a plurality of vertical positioning grooves  211  spacedly formed in the inner wall, a pair of longitudinal guides  212  respectively formed on upper and lower inner walls extended along the length thereof and a horizontal slot  213  adjacent front end. On the opposite side of the slot  213  is a depression  214  (as shown in FIG. 10) which is composed of a pair of semi-circles of reversed sloped surfaces. The second half  22  has a rectangular opening  221  extended along the length and a pair of guides  222  in the upper and lower walls of the opening  221 . 
     The slider  30  has a thumbprint outer surface  31 , a pair of outer guides  32  respectively formed in upper and lower edges each of which has a protrudent plate  321  at inner side, an inner sliding slot  33  which is formed by a pair of upper and lower L-shaped plates  331  in symmetrical manner, a U-shaped frame  341  extended rearward from the lower L-shaped plate  331  including a stopper  34  on the inner end, a pair of first semi-circular concaves  322  and a pair of second semi-circular concaves  323  spacedly and respectively formed in the upper and lower outer guides  32  of the slider  30 . Wherein the L-shaped plates  331  can be able to slide in the longitudinal guides  212  of the first half  21  and the protrudent plates  321  of the outer guides  32  can be able to slide in the guides  222  of the second half  22 . 
     The locking member  40  has a pair of outer sliding bars  41  respectively and parallel extended forward from upper and lower edges each including hook  411  on inner end toward each other and engageable within the first and second semi-circular concaves  322  and  323  of the slider  30  (as shown in FIG.  4 ), an inner sliding plate  42  extended forward from inner edge including an elastic plate  43  in the center and a blade holder  432  of bevel end on a center of the elastic plate  43  and an elastic press block  431  on rear end connected to the elastic plate  43 . 
     The swivel arrester  50  has a gripping plate  51  and a T-shaped lock  52  centrally projected from the back side of the gripping plate  51 . The T-shaped lock  52  has a transverse bar inserted into the slot  213  of the first half  21  and engaged with the reverse sloped semi-circular surfaces of the depression  214 . 
     The saw blade  60  has a circular hole  61  abutting each end and inserts into the inner sliding slot  33  of the slider  30  via the underside of the swivel arrester  50  and the gap of the handle  20  and its circular hole  61  is held by the blade holder  432  of the locking member  40  (as shown in FIGS.  5  and  6 ). When turns the swivel arrester for 90 degrees, The T-shaped lock  52  moves outward on the reverse sloped semi-circular surfaces of the depression  214 . So that the  15  middle portion of the saw blade  60  is tightly gripped by the gripping plate  51 . 
     When assembling, slide the pair of outer guides  41  and the inner sliding plate  42  of the locking member  40  respectively into the outer sliding slots  32  and the inner sliding slot  33  of the slider  30  with the pair of hooks  411  engaged within the pair of semi-circular concaves  322  (as shown in FIGS.  4  and  6 ). So that the slider  30  and the locking member are connected. Then put them on the longitudinal guides  212  of the first half  21  to have the L-shaped plates  331  sliding on the longitudinal guides  212  and the stopper  34  engaging within one of the vertical positioning grooves  211 . And the combine the second half  22  with the first half by bolts  23  to have the proturdent plates  321  sliding within the guides  222  of the second half  22 . Finally, insert the T-shaped lock  52  of the swivel arrester  50  into the slot  213  of the first half  21  (as shown in FIGS.  10  and  11 ). The engagement of the saw blade  60  into the handle  20  has been discussed as the above. FIG. 3 shows an outer look of the assembled handsaw of the present invention. 
     Before fastening the swivel arrester  50 , the slider  30 , can be able to slide about to adjust the outer length of the saw blade  60  and the stopper  34  follows the slider  30  to move longitudinally on the vertical positioning grooves  211  to emit snap sounds until an appropriate vertical positioning groove is sought. Then pulls the locking member  40  rearward to have the hooks  411  of the outer sliding bars  41  retreated to engage within the second semi-circular concaves  323  and the inner sliding plate  42  also retreated to press the stopper  34  to tightly engaged within the selected positioning groove  211 . So that the slider  30  is unable to slide. Then fastens the swivel arrester  50  to fix the saw blade  60  (as shown in FIGS.  7  and  8 ). 
     If removes the saw blade  60  out of the handle  20 , unfastens the swivel arrester  50  and presses the press block  431  of the locking member  40  inward so as to disengage the blade holder  432  with the circular hole  61 . Then the saw blade  60  is readily drawn out of the handle  20  (as shown in FIG.  9 ). After the saw blade  60  is removed, release the press block  431  and get ready to wait for next engagement of the saw blade  60  into the handle  20 . 
     Referring to FIG. 12, an alternate embodiment of the mini-handsaw of the present invention is provided. In this embodiment, the structure and function are mostly similar to that of the above embodiment as described in FIGS. 2 to  11  and the above discussions are applicable in the most instance. The only difference is that a bowed frame  244  is connected to the front end of the handle  20  and the horizontal slot  213  together with the depression  214  are moved to a reduced free end of the bowed frame  244  (not shown) to coordinate with the swivel arrester  50  to fix the front end of the saw blade  60 . The operation of this handsaw is almost no different from the operation of the above embodiment. The only purpose is to increase the stability of the saw blade  60 . 
     Note that the specification relating to the above embodiment should be construed as exemplary rather than as limitative of the present invention, with many variations and modifications being readily attainable by a person of average skill in the art without departing from the spirit or scope thereof as defined by the appended claims and their legal equivalents.