Abstract:
A buffer apparatus of a nailing gun, which controls the air flow in and out a chamber of a main body of the nailing gun, reduces the vibration of the nailing gun when nailing. The air will flow in with a larger rate and will flow out with a smaller rate, such that a buffer force will be provided to a bar being punched to reduce the vibration, and more particularly, the air flow also can bring the heat out.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a nailing gun, and more particularly to a composite a buffer apparatus of an electrical nailing gun. 
     2. Description of the Related Art 
     FIG. 1 shows a conventional nailing gun, comprising a main body  1 , a nail outlet  2 , a nail magazine  3 , a coil  4 , a bar  5  and a spring  6 . The bar  5  passes through the coil  4  and rests a front end thereof in the nail outlet  2  for punching nails (not shown). The bar  5  is provided with a stop flange  5   a  at a rear end thereof and the spring  6  is installed on the bar  5  having an end thereof against the stop flange  5   a  and the other end thereof against the coil  4 . While adding electricity to the coil  4  will generate magnetic force to drive the bar  5  punching out and make the spring  6  compressed as shown in FIG. 1, and while cut the power off, the magnetic force provided by the coil  4  will be gone and the spring  6  will drive the bar  5  back in the main body  1  as shown in FIG.  2 . 
     It will cause the nailing gun a large vibration when the punched-out bar  5  is drawn back by the spring  6  and crashes on the sidewall of the main body  1 . It sometime will affect nailing, or damage the sidewall of the main body  1 , or make the bar  5  deviating. Some conventional nailing guns were provided with a buffer block (not shown) therein to absorb the vibration, but the buffer block will loose the absorbing capacity after a long time of use. The buffer block sometime will escape from its original position, at this time, it will affect the bar  5  acting. 
     In addition, the coil will rise its temperature after a long time use and there still is no perfect solution for this problem. 
     SUMMARY OF THE INVENTION 
     The primary objective of the present invention is to provide a buffer apparatus of a nailing gun, which use air flow to provide the buffer capacity. 
     The secondary objective of the present invention is to provide a buffer apparatus of a nailing gun, which can dissipate the heat of coil. 
     According to the objectives of the present invention, it provides a buffer apparatus of a nailing gun, wherein the nailing gun comprises a main body, a coil and a bar. The main body has a nail outlet, a chamber therein and a through hole communicating the chamber to outside. The coil is provided in the chamber and the bar is movably provided in the chamber, which passes through the coil and corresponds to the nail outlet. A sealing member, which is a flexible piece, is provided in the chamber of the main body and secured to the bar, wherein the sealing member is against a sidewall of the chamber when extended. A returning member is provided at between the sealing member and the coil, and an adjusting member is provided in the chamber of the main body having a stop face and an aperture, wherein the adjusting member has an end thereof pivoted on the sidewall of the chamber to make the stop face sheltered and unsheltered the through hole and the aperture corresponds to the through hole which has a size smaller than the through hole. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a schematic view of a conventional nailing gun, showing a bar punched out; 
     FIG. 2 is a schematic view of the conventional nailing gun, showing the bar drawn back; 
     FIG. 3 an exploded view of a preferred embodiment of the present invention; 
     FIG. 4 is a sectional view in part of the preferred embodiment of the present invention; 
     FIG. 5 is an enlarged view in part of FIG. 4; and 
     FIG. 6 is a sectional view similar to FIG. 5, showing the bar punching a nail. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Please refer to FIG. 3 to FIG. 4, the first preferred embodiment of the present invention provides a nailing gun  100 , comprising a main body  10 , a nail outlet  20 , a nail magazine  30 , a coil  40 , a sealing member  50 , a support member  60 , a returning member, e.g. a spring  70 , a bar  80 , an adjusting member  90  and a pressing piece  95 . 
     The main body  10  consists of a main housing  11  and a rear box  12 . The main housing  11  has a head portion  111  and a handle  112 , wherein the head portion  111  is provided with the nail outlet  20  at a front end thereof and holes  113  at a rear end thereof The rear box  12 , a column-like element, is provided in the head portion  111  of the main housing  11  closing to the rear end thereof, which has a closed end  121  at an end thereof and an opening end  122  at the other end thereof The rear box  12  further has a chamber  13  therein and a through hole  14  at the closed end  121  communicating the chamber  13  with outside. 
     The coil  40  is mounted in the chamber  13  closing the nail outlet  20 . The coil  40  has a central hole  41 . 
     The sealing member  50  is made of flexible material, such as rubber, into a disk-like element, which has a masking face  51 , a sealing edge  52  at an edge of the masking face  51  and a through hole  53  at a center of the masking face  51 . The sealing member  50  is installed in the chamber  13  and the sealing edge  52  will be against an interior sidewall of the chamber when the masking face  51  is extended. 
     The support member  60  is a rigid disk which size is smaller than the sealing member  50 . The support member  60  has a top ring  61 , a concave portion  62  and a through hole  63 , wherein the top ring  61  locates around the concave portion  62 , the concave portion  62  orients the nail outlet  20  and the through hole  63  is provided at the concave portion  62 . 
     The spring  70  is installed in between the support member  60  and the coil  40  which opposite ends rests against the top ring  61  and the coil  40  respectively, therefore, the top ring  61  is against the masking face  51  and the location of the top ring  61  against the sealing member  60  is at between the sealing edge  52  and the through hole  53 . 
     The bar  80  has a head end  81 , a punching section  82 , a guiding section  83  and a tail end  84 . The head end  81  passes through the central hole  41  and extended in to the nail outlet  82  for punching nail. The punching section  82  is received in the through holes  41  and the guiding section  83  is extruded out of the coil  40 . Please refer to FIG.  3  and FIG. 5, the guiding section  83  of the bar  80  passes through the spring  70 , the through hole  63  of the support member  60  and the through hole  53  of the support member  50 . The bar  60  is provided with a stop portion  85  (such as a nut) to limited the sealing member  50  escaped form the bar  60 . In addition, the bar  80  will be driven by the magnetic force provided by the coil to move between a stand-by position P 1 , as shown in FIG. 4, and a punching position P 2 , as shown in FIG. 5 . The spring  70  is to drive the bar  80  to the stand-by position P 1  at initial. 
     The adjusting member  90  is a piece element which has a fixed end  91 , a stop face  92  and an aperture  93 . The adjusting member  90  is received in the rear side of the chamber  13  with the fixed end  91  thereof fixed to the interior sidewall of the main body  10 , such that the stop face  92  will be suspended and shelters the through hole  14  of the main body  10 . The aperture  93  locates at the stop face  91  corresponding to the through hole  14  and the size of the aperture  93  is smaller than the through hole  14 . 
     The pressing piece  95  is more flexible than the adjusting member  90  having a first end  951  and a second end  952 . The pressing piece  95  fixes the first end  951  thereof to the interior sidewall of the main body  10  and rests the second end  952  against the masking face  92  of the adjusting member  90  to make the sheltering the through hole  14  of the rear box  12 . 
     FIG.  4  and FIG. 5 show the nailing gun of the present invention in stand-by condition, wherein the bar  80  locates at the stand-by position P 1 , the spring  70  is uncompressed and the pressing piece  95  is pushing the adjusting member  90  to shelter the through hole  14 . 
     FIG. 6 shows the pushing condition, the coil  40  is electrified and generating magnetic force to drive the bar  80  rapidly moving to the punching position P 2 . In the beginning of the bar  80  moving, a vacuum force will applied to make the pressing piece  95  biasing and unsheltered the through hole  14 . In the mean time, the sealing member  50  will be curved by the top ring  61  of the support member  60  to make the edge of the sealing member  50  not against the sidewall of the chamber  13  anymore, such that air will be sucked into the chamber  13  via the holes  113  and the through hole  14  to make the bar  80  can move without any interference. 
     In the interval of bar moving back from the punching position P 2  to the stand-by position P 1 , as shown in FIG. 5, the sealing member will be against the sidewall of the chamber  13  and the pressing piece  95  will shelter the through hole  14  again. Air only can escape from the chamber  13  via the aperture  93 , such that the bar is buffered by the air. 
     The air flow in and out the chamber  13  can buffer the bar  80  when it is moving back from the punching position P 2  to the stand-by position P 1  but no interference will be applied when the bar  80  moves from the stand-by position P 1  to the punching position P 2 , except that the air flow also can convect the heat generating by the coil  14  out of the chamber  13 .