Abstract:
This is a kind of deflagration nail gun with sliding components and percussion switch devices. Described percussion switch devices include: station-keeping U-shaped steel wire with a jumper; pivoted percussion switch base with a notch at the back of its upper edge; ignition switch fixed on percussion switch base, with a prominent button upward; touch switch chip, of which, one of its end can be pivoted installed in the ignition switch, another end can extend from percussion switch base to the top touch chip on the top of notch, and the central of touch switch chip is joined to touch button. When the sliding component is located in the front-side position and the upper edge of percussion switch base is located at the bottom of jumper of U-shaped steel wire, the jumper can prevent switch base being pivoted along the direction of triggering. When the sliding component is located in the back-side position, the notch of percussion switch base is located under the jumper of U-shaped steel wire, which allows switch base to pivot along the direction of triggering. A deflagration nail gun with higher security can avoid the accidental shooting of nails causing human harm.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Technical Field 
         [0002]    The utility model is relating to the deflagration nail gun, and has a percussion system with higher security. 
         [0003]    2. Description of Related Art 
         [0004]    Workers in the construction, decorating and furniture industries, when assembling wooden means, concrete and steel means, usually use a nail gun. Nails can be fired at high speed by using a nail gun, and instantly launched into fixed-pieces. 
         [0005]    Common nail guns currently include the spring-loaded nail gun, pneumatic nail gun and deflagration nail gun. 
         [0006]    The deflagration nail gun is one of highlights of the recent market. It has an explosion cylinder which can be supplied with combustible gas, and there is a small fan which can mix combustible gas with air. By igniting the mixture of air and combustible gas in the explosion cylinder, the explosion inside the cylinder provides explosive power to push the piston of the cylinder forward, the piston rod shocks the nail in the nail tube and shoots the nail out. 
         [0007]    Deflagration nail guns are generally equipped with security measures to avoid people being shot accidentally with a nail. The common security measure is safety detent equipment, in which the piston or piston rod can be fixed. To release the detent, the nail gun must be aligned to a working surface to push nail tube. Such a safety measure can reduce the risk of injury, but is still not perfectly safe. For example, when the trigger of a nail gun is under the triggering state, and the nail gun is aligned to any working surface and pressed, the nail gun may shoot the nail out automatically. So if a person presses the nail gun onto his or someone else by accident, a nail may shoot out. 
         [0008]    In order to reduce this risk, some manufacturers equipped the inside of nail guns with sequential tripping equipment. When using this kind of nail gun, you must release the trigger and then pull the trigger if you want to shoot a nail out. However, such a security measure can&#39;t avoid the nail being shot out if a person accidentally pulls the trigger even when the nail gun isn&#39;t pressed against a working surface. 
         [0009]    Therefore, the security of operating a deflagration nail gun needs improvement, so as to avoid the nail accidentally being shot out. 
       BRIEF SUMMARY OF THE INVENTION 
       [0010]    The technical problem that needs to be solved by this utility model is to avoid the traditional deflagration nail gun shooting the nail out accidentally. 
         [0011]    Therefore, this utility model provides a deflagration nail gun which includes: 
         [0012]    Chassis: 
         [0013]    Nail tube, fixed core set, four-claw frame and explosion cylinder are connected in turn from the front to the back; 
         [0014]    Cylinder head fixed-installed in the back of chassis; 
         [0015]    Fixed-installed (relative to the chassis) and located in the cylinder of explosion cylinder and four-claw frame as described above; 
         [0016]    Piston sliding front and rear in the above cylinder; 
         [0017]    Piston rod—its back-end is connected to the above piston, the front-end is inserted into the fixed core set and is suitable for pushing into above nail tube; and 
         [0018]    Start switch devices of percussion operation of deflagration nail gun. 
         [0019]    The characteristics of the above percussion switch devices include: 
         [0020]    Station-keeping U-shaped steel wire, fixed at the bottom of above explosion cylinder, has a jumper and two arms linked with it and back extended, nail tube, fixed core set, four-claw frame, explosion cylinder and station-keeping U-shaped steel wire as described above forming a sliding component which can slide in the front-side and back-side and is suitable for the above chassis; 
         [0021]    Percussion switch base which can be pivoted-fixed in the chassis, and has a notch at the back of the upper edge of above percussion switch base; 
         [0022]    Ignition switch fixed on the above percussion switch base, with a prominent button upward; and 
         [0023]    Touch switch chip—one of its ends can be pivoted installed in the ignition switch, another end can extended from percussion switch base to the top touch chip on the top of the notch, the central of touch switch chip joins the touch button. 
         [0024]    When the sliding component is located in the front-side position, the upper edge of percussion switch base is located at the bottom of jumper of U-shaped steel wire, and the jumper can prevent the switch base from pivoting along the direction of triggering ignition switch. 
         [0025]    When the sliding component is located in the back-side position, the notch of the percussion switch base is located at the bottom of the jumper of U-shaped steel wire, which allows switch base to be pivoted along the direction of above triggering. 
         [0026]    Preferably, when the described sliding component is in the described back-side position, it will form a closed explosion chamber in described explosions cylinder. 
         [0027]    Preferably, described deflagration nail gun will also include a resilience reset device, and it will push described sliding components forward. 
         [0028]    Preferably, described percussion switch will also include a trigger. This trigger will be installed in the chassis by sliding front-to-rear; it will have exposed moving parts and pulling part extended from trigger part; and there will be a pulling pin at the front of described pulling part which can be inserted in the driving slot of described percussion switch. 
         [0029]    Preferably, described percussion switch will include two parallel base plates and one pivot sleeve vertical to these base plate, and the percussion switch base will be installed in the chassis through pivot of the pivot sleeve, and form described driving slot in each described base. 
         [0030]    Preferably, the ignition switch mentioned above will be installed between two base plates; there will be a guiding convex formed on the ignition switch and a guiding groove formed in the inner surface of base plate; described guiding convex is inserted in this guiding groove. 
         [0031]    Preferably, when the described sliding component is in its back-side and described percussion switch is pivoted along the direction of triggering, described jumper of station-keeping U-shaped steel wire will push the contacted part in the notch in order to press contacted button by touch switch chip. 
         [0032]    Preferably, fans and combustible gas nozzle will be set for the described cylinder head. 
         [0033]    Preferably, one or more holes penetrating the sides will form in the front side of described cylinder, a one-way valve will be installed in these holes and therefore the air will flow out of the cylinder but will not flow into the cylinder. 
         [0034]    Preferably, above nail tube, fixed core set, four-claw frame, explosion cylinder, piston, piston rod, and cylinder will have a common center line extending along the front and rear direction. 
         [0035]    According to this utility model, the deflagration nail gun will be equipped with a higher security percussion system, and firing will only be possible after the trigger is released and the nail tube is pressed against a working surface again. Therefore, its higher security will avoid accidental shooting of nails. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0036]      FIG. 1  is the constructed profile of this utility model of deflagration nail gun in the state of not being used. 
           [0037]      FIG. 2  is the constructed profile of major operation part of this utility model of deflagration nail gun. 
           [0038]      FIG. 3  is the constructed profile of this utility model of deflagration nail gun in the state of nail tube being pushed. 
           [0039]      FIG. 4  is the constructed profile of this utility model of deflagration nail gun in the state of burning and exploding combustible gas in the explosion chamber after pulling the trigger. 
           [0040]      FIG. 5  is the constructed profile of this utility model of deflagration nail gun in the state of piston resetting automatically after burned and exploded combustible gas in the explosion chamber. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0041]    The following is the description of the utility model deflagration nail gun according to the reference figures. 
         [0042]    Refer to  FIG. 1  and FIG.  2 —deflagration nail gun using one of the preferable implementation methods of utility model includes the following parts: chassis  100 ; nail tube  1 ; piston  2 ; piston rod  21 ; fixed core set  3 ; four-claw frame  4 ; cylinder  5 ; explosion cylinder  8 ; cylinder head  10 ; percussion switch device  20 . The following is a detailed description of these parts. 
         [0043]    First of all, similar to the structure of traditional deflagration nail guns, this utility model deflagration nail gun has chassis  100  with a comfortable handle for the user; it can install and accommodate various parts of nail gun. Understandably, chassis  100  is not a single part, but it is formed by many chassis parts. The shape of chassis  100  is symmetrical to the vertical center plane extended front and rear in the rough. 
         [0044]    Nail tube  1  can be installed at the top of front-side of chassis  100  by sliding front and rear, nail (not shown) can be inserted in the nail tube  1 , for example, inserted into the inner hole from the front end of the nail tube  1 , while the front end of piston rod  21  can enter into inner hole of nail tube from the front end of nail tube  1  and hit the nail, then shoot nail out forward. 
         [0045]    Fixed core set  3  has been concentrically installed in the back end of the nail tube  1 . Fixed core set  3  has a fixed core hole aligned with the inner hole. The front end of piston rod  21  is inserted into fixed core hole of fixed core set  3  in order to enter the inner hole of the nail tube correctly. 
         [0046]    Four-claw frame  4  is fixed to the back end of fixed core set  3 , four-claw frame  4  has disc  41  adjacent to the back end of fixed core set  3  and four connecting arms  42  extending back from disc. The front of explosion cylinder  8  is fixed to the back-end of connecting arm  42  by using bolt  6 , and the outer side of explosion cylinder  8  can match chassis  100  by sliding. 
         [0047]    Therefore, we can see that nail tube  1 , fixed core set  3 , four-claw frame  4 , explosion cylinder  8  and station-keeping U-shaped steel wire  17  described below can be fixed to form a front-to-rear sliding component. Cylinder head  10  is fixed-installed in the rear of chassis, and has bulge  101  which has outside border O-shaped sealing ring  9 . 
         [0048]    When the user grips the nail gun and pushes the front end of nail tube  1  on an object such as a working surface, and then continues to move the nail gun forward, pushing power borne by nail tube will move backward the sliding component formed by nail tube  1 , fixed core set  3 , four-claw frame  4 , explosion cylinder  8  and station-keeping U-shaped steel wire  17  until the back end of explosion cylinder  8  arrives at the cylinder head  10  and/or snap flange  51  expended outward of nail tube  1  arrives at the corresponding part of chassis. At this time, O-shaped sealing ring  9  and inner side of flange  81  extended inward at the back-end of explosion cylinder  8  forms a sealing surface. In addition, the sliding component is equipped with a resilience reset device (not shown) in order to move the sliding component forward. When the sliding component moves forward, disc  41  of four-claw frame  4  will touch the corresponding position of the chassis, and stop the sliding component moving forward. 
         [0049]    Cylinder  5  is installed in the explosion cylinder  8 . Like cylinder head  10 , cylinder  5  is fixed in the chassis, so the location of two parts is relatively stationary. 
         [0050]    When the explosion cylinder  8  moves backward, flange  82  extended inward in the middle of explosion cylinder  8  will move to the outer side of back-end  53  of cylinder  5 , thus described flange  82  extended inward will match outer side of back-end  53  by sliding. At the same time, described flange  81  extended inward will match bulge  101  mentioned above by sliding. 
         [0051]    In addition, in order to insert the back-end of explosion cylinder  8  in the cylinder head  10 , there is a guiding bulge  83  extended backward at the back-end of explosion cylinder  8 , and a corresponding part of guiding bulge  83  on the cylinder head  10 . When the explosion cylinder  8  moves backwards, guiding bulge  83  will match the corresponding part, thus causing the explosion cylinder  8  to be placed in the correct position of cylinder head  10 . 
         [0052]    In addition, O-shaped sealing ring  7  is installed on the outer wall  53  of described back-end. When explosion cylinder  8  is located in the back position, a sealing is formed between above O-shaped sealing ring  7  and bulge  82  extended inward, thus cylinder  5  and cylinder head  10  will close explosion cylinder  8  (see  FIG. 3 ). When the explosion cylinder  8  moves from the back-side position to forward, O-shaped sealing ring  7  is disengaged from bulge  82  extended inward, thus cylinder  5  and cylinder head  10  will open explosion cylinder  8  (see  FIG. 1 ) 
         [0053]    One or more holes  52  penetrating the side are formed in the front of cylinder  5 . One-way valve is installed in these holes  52  and therefore the air can flow out of cylinder  5  but can&#39;t flow into the cylinder. 
         [0054]    Piston  2  is fixed on the back end of piston rod  21 , and can front-to-rear slide in the barrel of cylinder  5  with piston rod. 
         [0055]    The center lines of nail tube  1 , fixed core set  3 , four-claw frame  4 , explosion cylinder  8 , cylinder  5 , piston  2 , piston rod  21  and cylinder head  10  are collinear, namely they have collinear center line  0 - 0 ′ extended along the front and back direction, as shown in  FIG. 1 . This center line  0 - 0 ′ is located in the vertical center plane. 
         [0056]    Percussion switch device  20  is installed under the four-claw  4  in the chassis to control the firing operation of nail gun. Percussion switch device  20  includes percussion switch base  11 , touch switch chip  12 , ignition switch  14 , trigger  15 , and station-keeping U-shaped steel wire  17 . Detailed instructions follow. 
         [0057]    Percussion switch base  11  includes two parallel base plates  112  and one pivot sleeve  111  vertical to these base plates, percussion switch base  111  is installed in the chassis  100  through pivot  19  of the pivot sleeve  111 , pivot  19  is perpendicular to vertical center plane mentioned above, thus percussion switch base  11  can pivot around pivot  19 . Described bases  112  have driving slot  113  extended downwards. 
         [0058]    Trigger  15  can be installed in the chassis by front-to-rear sliding, and expose buttoning part  151  used for buttoning backwards and pull part  152  stretched forward. The front of pull part  152  has two pull pins  153 , and these pull pins  153  are inserted in the driving slot  113  of base  112 . Normally, trigger  15  is pushed down to the forward stretched position by a built-in spring. At this point, the user pushes back and presses buttoning part  151  with a finger and trigger  5  moves backwards, thus pull pin  153  will make percussion switch base  11  rotate around pivot  19  and along the trigger direction (clockwise direction in  FIG. 1 ). 
         [0059]    Touch switch chip  12  is installed between two base plates  112 . One end of touch switch chip has pivot installation part  121 , and another end is touch part  122 . On pivot installation part  121 , touch switch chip  12  can be pivoted installed in the position between two base plates  112  by using pin  16 . Pin  16  is also perpendicular to above vertical center plane. Touch switch chip  12  extends backward and upward from other pivot installation part  121 , thus touch part  122  extends backward from percussion switch base  11 . 
         [0060]    Ignition switch  14  is installed between two base plates  112 . Such ignition switch  14  is fixed on one or two base plates  112  by using screw  13 , and is located under the touch switch chip  12 . In order to locate ignition switch  14  between two base plates  112 , there is guiding bulge on one or two sides of the bottom of ignition switch  14 , this guiding bulge can be inserted in the guiding groove  115  formed in the inner wall of base plates  112  in order to locate the ignition switch  14  relative to the percussion switch base  11 . 
         [0061]    Ignition switch  14  has a contact button  141  extended upward. Pressing contact button  141  can start the ignition switch  14 . The middle part of touch switch chip  12  is joined on the contact button  141 , so the touch switch chip  12  is located between stopping block  114  of percussion switch base  11  and contact button  141  of ignition switch  14 , and can press contact button  141  by pivoting pin  16  relative to the ignition switch  14 , to start ignition switch  14 . 
         [0062]    Station-keeping U-shaped steel wire  17  is a one-piece with a jumper  172  formed by bending a steel wire and two arms extended backwards. Each of these two arms has end  171  which can be used for fixing station-keeping U-shaped steel wire  17  on the bottom of explosion cylinder  8 . When the nail tube mentioned above is pushed backwards, station-keeping U-shaped steel wire  17 , as one of the sliding components, will move backwards. 
         [0063]    When sliding components move to the front position, as shown in  FIG. 1 , the upper edge of two base plates  112  of percussion switch base  11  is adjacent to the jumper  172  of station-keeping U-shaped steel wire  17 , preventing the percussion switch base  11  pivoting along the triggering direction. 
         [0064]    In addition, notches  116  are formed at the upper edge of two base plates  112  of percussion switch base  11 . Touch part  122  described above extends to the top of touch surface. When the sliding components move to the back position, above notch  116  can push and press touch part  122 , and snap the jumper  172  of station-keeping U-shaped steel wire  17 , allowing the percussion switch base  11  to be pivoted along the triggering direction. 
         [0065]    This means that only when the sliding component moves to the back position which can close explosion cylinder  8 , trigger  15  can be pulled, and then ignition switch  14  can be started. In the state of opening explosion cylinder  8 , trigger  15  can&#39;t be pulled, and then ignition switch  14  can&#39;t be started. 
         [0066]    When the whole sliding component moves to the back position, as mentioned above, pulling the trigger  15  backwards will result in percussion switch base  11  moving around pivot  19  along the direction of triggering, percussion switch base  11  will take the touch switch chip  12  to this position, that is the touch part  122  of touch switch chip  12  touch the jumper  172  of station-keeping U-shaped steel wire  17 . As the percussion switch base  11  moves along the triggering direction and ignition switch  14  moves upwards, touch part  122  prevented by jumper  172  will press the contact button  141  of ignition switch  14 , then start ignition switch  14 . At this time, notch  116  at the back of upper edge of two base plates  112  of percussion switch base  11  will snap the jumper  172  of station-keeping U-shaped steel wire  17 . 
         [0067]    The following describes the operation of this utility model deflagration nail gun. 
         [0068]    In the state of nail gun being not operated, each part is located in the position as shown in  FIG. 1 , the sliding component formed by its nail tube  1 , fixed core set  3 , four-claw frame  4 , explosion cylinder  8  and station-keeping steel wire  17  is located in the front side, and the explosion cylinder  8  is open. At this time, jumper  172  of station-keeping U-shaped steel wire  17  will be adjacent to the upper edge of two base plates  112  of percussion switch base  11 , and thus the trigger  15  can&#39;t be pulled. 
         [0069]    Next, by pushing and pressing the nail tube  1  on a working surface and pushing it into the chassis, the sliding component will move backwards to the back-side position, as shown in  FIG. 3 . At this time, explosion  8  is closed to form the close explosion chamber in the explosion cylinder. The outer border of this explosion chamber is limited by explosion cylinder, its front-end is limited by cylinder  5  and piston  2 , and its back-end is limited by cylinder head  10 . The jumper  172  of station-keeping U-shaped steel wire  17  will move backwards and align with the notch  116  of percussion switch base  11 , allowing trigger  15  to be pulled. 
         [0070]    Then, inject the combustible gases into explosion chamber. Pulling the trigger  15  can cause percussion switch base  11  with touch switch chip  12  and ignition switch  14  to turn along the triggering direction. When the touch part  122  of touch switch chip  12  touches the jumper  172  of station-keeping U-shaped steel wire  17 , the turning of touch switch chip  12  is stopped, and the ignition switch  14  will turn with percussion switch base  11 , which means ignition switch  14  will move upwards and will result in contact button  141  pressing into ignition switch  14  by touch switch chip  12 , thus closing the ignition switch  14  and connecting the ignition circuit in order to realize ignition in the explosion chamber. The combustible gas and air mixture in the explosion chamber are exploded and burned, resulting in the expansion of high-temperature and high-pressure gas, as shown in  FIG. 4 , piston  2  with piston rod  21  is pushed backwards by the high-temperature and high-pressure gas, the front end of piston rod hits the nail located in the nail tube  1  and shoots the nail out. Extra high-temperature and high-pressure gas are discharged through the hole  52  of the side of cylinder  5 . 
         [0071]    Once fired, because outside air can&#39;t enter cylinder  5  through the hole  52  of cylinder  5  side, the explosion cylinder (explosion chamber) can still be seen as a closed chamber relative to the outside at this time. High-temperature air in the closed explosion cylinder begins to cool and form a low pressure. Namely, the inner side of piston  2  forms a low pressure while outer side of piston is under the atmospheric pressure. Under the pressure difference between inner side and outer side of piston  2 , piston  2  and piston rod  21  move backwards to reset, as shown in  FIG. 5 . During the period which piston and piston rod are reset by the effect of pressure difference, jumper  172  of station-keeping U-shaped steel wire  17  continues to snap the notch  116  of percussion switch base  11  to prevent above sliding component moving forward, thus ensuring low pressure in the explosion cylinder until the piston and piston rod finish resetting. 
         [0072]    Provide the following security guarantees according to this utility model. As shown in  FIGS. 1 ,  3 ,  4 , and  5 , pulling trigger can only be done in the state of explosion cylinder being closed completely, and then percussion switch base  11  is turned and starts ignition switch  14 . In addition, during turning, touch switch chip  12  starting ignition switch  14  and notch  116  of percussion switch base  11  snapping station-keeping U-shaped steel wire  17  can be done at the same time, or start ignition switch  14  to realize firing firstly, and then station-keeping U-shaped steel wire  17  is snapped by notch  116  of percussion switch base  11 . This method effectively prevents the following unsafe operation: if firing after the notch  116  of percussion base  11  snapped station-keeping U-shaped steel wire  17 , it is unsafe because nail tube may fire when leaving the working face. 
         [0073]    After fire and the piston rod reset automatically, release the trigger  15  and reset the trigger forwards by the flexibility of trigger built-in spring, as shown in  FIG. 1 . Driven by the trigger, percussion switch base  11  will turn and reset along the resetting direction (counter-clockwise as shown in  FIG. 1 ). Resetting of percussion switch base will result in the circuit being off. At the same time, notch  116  of percussion switch base  11  leaves station-keeping steel wire  17  and above sliding component may move forward to the front-side position under the effect of resilience reset device (as shown in  FIG. 1 ). 
         [0074]    It can be understood that the fans equipped for explosion chamber can mix the blasted combustible gas and air. Preferable fan position is in the cylinder head  10 . Preferable cylinder head  10  also has the nozzle used for introducing combustible gas into the explosion chamber. 
         [0075]    Preferably, when nail tube  1  is pushed and pressed backwards (viz. into the chassis), explosion cylinder  8  will connect the fan switch first when explosion cylinder moves backward, pulling the trigger and connecting the ignition switch. As shown in  FIG. 3 , it can be seen that trigger  15  can be pulled one or more times. However, when the nail tube is pushed and pressed, the combustible gas introduced into explosion chamber is quantitative, so the combustible gas in the explosion chamber can be lit once. Thus, after pulling the trigger  15  and light successfully, nail tube must be pushed and pressed again to introduce combustible gas into the explosion chamber, then it can be lit again. Therefore, the utility model deflagration nail gun has greater security. 
         [0076]    Moreover, according to the utility model, the trigger can be pulled after pressing the nail tube. This avoids the risk mentioned above of safe detent device firing accidentally by using existing technologies. 
         [0077]    In addition, according to the utility model, the trigger must be released first after firing, then the next pressing nail tube and pulling trigger can be done, thus providing twice the insurance measures compared to the technology of sequential tripping used in traditional technologies, and greatly enhancing the safety level.