Patent Publication Number: US-2011057014-A1

Title: Nailing Gun Trigger Safety Device and Nailing Gun Provided with the Same

Description:
FIELD OF THE INVENTION 
     The invention relates to a trigger safety device, more particularly to a nailing gun equipped with the device. 
     BACKGROUND OF THE INVENTION 
     Owing to convenient carrying and usage, small power tools have become indispensible to various projects such as construction, civil engineering, decoration, etc. Increasing importance is attached to the safety of the power tools in the usage process thereof. In order to avoid that accidental trigger of the nailing gun in the projects accidentally injures people or objects, a trigger safety device is usually required to be arranged on the nailing gun to protect users. In the utility model patent of China (Patent Number: 200620055098.1, Publication Day Feb. 21, 2007), a nailing gun safe device is disclosed, which comprises a pneumatic safety device, a top support device and a driving device, wherein the pneumatic safety device comprises a valve seat and an air valve arranged inside the valve seat and capable of slideable movement in the valve seat; the top support device is linked with the driving device, and by pressing the top support device, the position of the air valve can be limited through the driving device; and two ends of the driving device are respectively linked with the air valve of the pneumatic safety device and the top support device. The nailing gun safety device described in the patent realizes the linkage between the top support device and the pneumatic safety device through the driving device in order to achieve the purpose of protecting users, however, the pneumatic safety device with complex structure of the air circuit and quite high requirement on processing precision needs to be connected with a high pressure air chamber and shunts high pressure air, so the production cost of the nailing gun is increased; in addition, the pneumatic safety device has larger volume and occupied space, increasing the volume and the weight of the entire nailing gun. 
     Further, a mechanical trigger safety device disclosed in the utility model patent of China (CN2880397Y) includes a slideable push rod protruding in front of a nozzle, when the push rod is pushed backwards to slide backwards, a poking rod pivoted on a gun body is pushed, a rotating component is pushed subsequent to the rotation of the poking rod so as to move away a stop block on a switch. Hence, the nailing gun can achieve triggered only after the push rod at the nozzle is pushed by processed materials, thereby protecting the users. Nevertheless, the structure of this nailing gun is apparently only suitable for electric nailing guns, not for pneumatic nailing guns. Furthermore, such a nailing gun cannot differentiate correct operation sequence, which leads to the fact that the percussion of the nailing gun occurs only if the push rod is pressed and the trigger is pulled, causing danger in some cases. Some users make it a rule to pull the trigger tightly all the time, so the trigger of the nailing gun occurs in case that the nozzle is accidentally touched. 
     SUMMARY OF THE INVENTION 
     The technical problem required to be solved in the invention lies in overcoming the deficiencies in the prior art, and providing A nailing gun trigger safety device and a nailing gun provided with the same with simple structure, convenient use and good safety. 
     A nailing gun trigger safety device according to the invention comprises a contact-jacking mechanism  20 , a poking mechanism  30  linked with the contact-jacking mechanism  20  and a transmission mechanism  40  linked with the poking mechanism  30 , wherein the contact-jacking mechanism  20  can be slideably mounted on a nozzle  11  of the nailing gun body  1 ; and the device is characterized in that: the nailing gun trigger safety device is arranged on the nailing gun body  1  and is linked with a trigger mechanism  50 ; 
     the trigger mechanism  50  comprises a trigger  52  and a pressing sheet  51  driven by the trigger, and an air needle  54  for starting up a nailing gun percussion mechanism, wherein the contact-jacking mechanism  20  is linked with the pressing sheet  51  via the poking mechanism  30  and the transmission mechanism  40 ; 
     when the contact-jacking mechanism  20  is not pressed, the pressing sheet  51  is positioned at a first initial position and the air needle  54  is beyond the stroke of the pressing sheet  51 ; 
     when the contact-jacking mechanism  20  is pressed, the contact-jacking mechanism  20  pushes the pressing sheet  51  to a second initial position via the poking mechanism  30  and the transmission mechanism  40 , and the air needle  54  is within the stroke of the pressing sheet  51 . 
     Further, the transmission mechanism  40  comprises a mounting rack  41  suitable for the arrangement on the nailing gun body  1 , an L-shaped guide rod  42  and a bending rod  43  articulated with the rear end of the guide rod  42 , wherein the middle corner of the L-shaped guide rod  42  is mounted on the mounting rack  41  via a pivot  45 , the front end of the guide rod  42  is linked with the poking mechanism  30 , and the bending rod  43  is linked with the pressing sheet  51  of the trigger mechanism  50 ; 
     the poking mechanism  30  comprises a bracket  31  mounted on the nozzle  11 , a fork  32  rotatably mounted on the bracket  31  and an elastic member  33  suitable for being mounted on the bracket  31  and fit with the fork  32 , wherein the fork  32  is mounted on slide slot on the bracket  31  via a pivot  34 , the elastic member  33  pushes the pivot  34  to the front end of the slide slot; the fork  32  further comprises a front end part linked with the contact-jacking mechanism  20  and a rear end part butting against the rear end of the guide rod  42  of the transmission mechanism  40 ; 
     the contact-jacking mechanism  20  comprises a contact-jacking member  23 , an anti-pushing member  21  fixed at the tail end of the contact-jacking member  23  and an elastic member  22  arranged between the anti-pushing member  21  and the contact-jacking member  23 , wherein the contact-jacking member  23  can be slideably mounted on the nozzle  11 , and the anti-pushing member  21  butts against the front end part of the fork  32  of the poking mechanism  30 . 
     The nailing gun equipped with the nailing gun trigger safety device is characterized in that: the nailing gun comprises the gun body and the nailing gun trigger safety device. 
     Under the initial situation, the pressing sheet is positioned at the first initial position and the air needle is beyond the stroke of the pressing sheet. In this case, pulling the trigger cannot lead to the percussion of the nailing gun. 
     When being pressed, the contact-jacking mechanism pushes the front end part of the fork  32 , and since the pivot  34  of the fork  32  is pushed by the elastic member  33  and accordingly maintained at the front ends of the slide slots, the fork  32  can rotate only. The rear end part of the fork  32  presses the front end of the guide rod  42 , and after the guide rod  42  rotates, the rear end thereof drives the bending rod  43  to move backwards. The bending rod  43  pushes the pressing sheet  51  to the second initial position, and the air needle  54  is within the stroke of the pressing sheet  51 . In this case, the air needle  54  can be triggered by the pressing sheet  51  by pulling the trigger again. 
     If the trigger is pulled at first and the contact-jacking mechanism is pressed subsequently, just as the bad habit of some users of pulling the trigger tightly all the time, the percussion of the nailing gun cannot occur. Under the situation that the contact-jacking mechanism at the front part of the nozzle is not pressed, after the trigger is pulled, the pressing sheet  51  pushes the bending rod  43  to move forwards, the guide rod rotates clockwise to push the fork to rotate counterclockwise, and the front end part of the fork pushes the contact-jacking mechanism to move forwards, thereby achieving the effect that the pressing sheet  51  pushes the transmission mechanism  40  and the poking mechanism  30 , the front end of the contact-jacking mechanism  20  is not fixed yet at this moment and pushed towards the front end of the nozzle  11  under the pushing of the poking mechanism  30 . In this case the air needle is beyond the stroke of the pressing sheet, and can&#39;t been triggered. 
     The contact-jacking mechanism  20  is then pressed, and since the transmission mechanism  40  is obstructed by the air pressure of the switch, the pivot  34  of the fork  32  neutralizes the resistance of the elastic member  33  to move backwards inside the slide slot of the bracket  31 , neither poking the transmission mechanism  40  nor pushing the pressing sheet  51  of the switch to cause percussion. 
     The nailing gun equipped with the safe device according to the invention can achieve percussion only according to correct operation sequence, enhancing the safety of the nailing gun. 
     Compared with the prior art, a nailing gun trigger safety device and a nailing gun equipped with the device according to the invention at least have the following advantages: 
     1. A nailing gun trigger safety device provided by the invention is provided with a poking device and a transmission device between the contact-jacking mechanism and the trigger mechanism, such a mechanical structure enables the nailing gun trigger safety device to simple structure, thereby reducing the manufacturing cost of the nailing gun. 
     2. A nailing gun trigger safety device provided by the invention adopts the mechanical structure, which diminishes the occupied space of the nailing gun trigger safety device and the volume of the nailing gun, as well as reduces the weight of the nailing gun. 
     3. Better safety. 
     Partial description regarding advantages of the invention in additional aspects is given in the following embodiments, and the advantages become more apparent in the description below, or understandable through practices of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The advantages of the invention become apparent and easy for understanding in the description below with reference to the attached drawings, wherein: 
         FIG. 1  is a schematic diagram of the disassembled nailing gun trigger safety device according to the invention. 
         FIG. 2  is a sectional view of the nailing gun trigger safety device according to the invention in an original state. 
         FIG. 3  is a sectional view of the nailing gun trigger safety device according to the invention in an untargeted percussion state. 
         FIG. 4  is a sectional view of the nailing gun trigger safety device according to the invention in an untargeted percussion-subsequent backpressure state. 
         FIG. 5  is a sectional view of the nailing gun trigger safety device according to the invention in a percussion state. 
     
    
    
     DETAIL DESCRIPTION OF THE INVENTION 
     Detailed description is made to the embodiments of the invention, and examples of the embodiments are shown in the attached drawings, with the same mark number always representing the same element. The explanation of the invention is given below through the embodiments described with reference to the attached drawings, and the embodiments, which are exemplary, cannot be explained to the limitation for the invention. 
     With reference to the  FIG. 1 , the nailing gun trigger safety device is arranged on the nailing gun body  1  and is linked with the trigger mechanism  50 , what needs to explain is that the linkage herein means the junction of the safe device and the trigger mechanism  50  can move as the trigger mechanism  50  moves during the movement of the trigger, so as to drive the entire nailing gun trigger safety device to move. For example, the trigger mechanism comprises a trigger  52 , a pressing sheet  51 , a pivot  53 , and an air needle  54  for starting up the nailing gun percussion mechanism, the trigger  52  can be rotatably fixed to the nailing gun body  1  and is connected with the pressing sheet  51  via the pivot  53 , and when the trigger  52  is pulled, the pressing sheet  51  can press the junction thereof with the nailing gun trigger safety device. Specific connection way and operating process are described below. The nailing gun trigger safety device comprises a contact-jacking mechanism  20  and a poking mechanism  30  linked with the contact-jacking mechanism  20 , the contact-jacking mechanism  20  can be slideably mounted on the nozzle  11  of the nailing gun body  1 , the poking mechanism  30  is linked with the contact-jacking mechanism  20 , the nailing gun trigger safety device further comprises a transmission mechanism  40  linked with the trigger mechanism  50 , and the transmission mechanism  40  is respectively linked with the poking mechanism  30  and the trigger mechanism  50 . 
     With reference to the  FIG. 1 , according to the above embodiment of the invention, the transmission mechanism  40  comprises a mounting rack  41  suitable for the arrangement on the nailing gun body  1 , an guide rod  42  movably mounted on the mounting rack  41  and a bending rod  43  linked with the guide rod  42 , the guide rod  42  is linked with the poking mechanism  30 , and the bending rod  43  is linked with the trigger mechanism  50 . When the trigger mechanism  50  moves, the poking mechanism  30  can generate movement through the linkage thereof with the transmission mechanism  40 , in the same way, when the contact-jacking mechanism  20  moves, the trigger mechanism is maintained in certain state by means of the linkage of the poking mechanism  30  and the transmission mechanism  40 . 
     With reference to the  FIG. 1 , according to the above embodiment of the invention, the guide rod  42  is mounted on the mounting rack  41  in an articulated manner. The guide rod  42  is connected with the bending rod  43  via a pivot  44 . Specifically, the rear end of the guide rod  42  is connected with the front end of the bending rod  43  via a pivot  45 , and the bending rod  43 , when moving back and forth along the mounting rack, can drive the guide rod  42  to rotationally move simultaneously. The bending rod  43  is linked with the trigger mechanism  50 , and the guide rod  42  is linked with the poking mechanism  30 , in this case, the linkage of the trigger mechanism  50  and the poking mechanism  30  is completed via the guide rod  42  and the bending rod  43 , thereby further achieving the linkage of the trigger mechanism  50  and the contact-jacking mechanism  20 . Specifically, the contact-jacking mechanism  20  is linked with the pressing sheet  51  via the poking mechanism  30  and the transmission mechanism  40 . 
     With reference to the  FIG. 1 , according to the above embodiment of the invention, the guide rod  42  is L-shaped, the rear end of the L-shaped guide rod  42  is linked with the bending rod  43 , the left side part of the front end of the L-shaped guide rod is linked with the poking mechanism  30 , and the middle corner of the L-shaped guide rod is mounted on the mounting rack  41  via the pivot  44 . The L shape of the guide rod  42  lengthens the moving distance of the guide rod  42  and the poking mechanism  30  and also enhances the flexibility of the trigger safety device. 
     With reference to the  FIG. 1 , according to the embodiments of the invention, the poking mechanism  30  comprises a bracket  31  suitable for being mounted on the nozzle  11 , a fork  32  rotatably mounted the bracket  31  and an elastic member  33  suitable for being mounted on the bracket  31  and fit with the fork  32 . More specifically, the fork  32  is mounted on the bracket  31  via the pivot  34 , and comprises a front end part linked with the contact-jacking mechanism  20  and a rear end part linked with the transmission mechanism  40 . The contact-jacking mechanism  20  comprises a contact-jacking member  23 , an anti-pushing member  21  fixed at the tail end of the contact-jacking member  23  and an elastic member  22  arranged between the anti-pushing member  21  and the contact-jacking member  23 , the contact-jacking member  23  can be slidably mounted on the nozzle  11  and the anti-pushing member  21  is linked with the poking mechanism  30 . The bracket  31  is fixed on the nozzle  11  and is provided with symmetrical slide slots at the front end thereof, the fork  32  is connected to the slide slots of the bracket  31  via the pivot  34 , the front end is erected at two sides of the nozzle  11  in a forked manner and is clamped with the anti-pushing member  21  of the contact-jacking mechanism  20  to achieve linkage, the middle of the bracket  31  is provided with an elastic member  33 , through which elastic force is offered to realize push-against so that the pivot  34  moves, while retracting, towards the front end of the nozzle  11  in case that no external force is applied. 
     With reference to the  FIG. 1 , a nailing gun provided with trigger safety device according to the invention comprises a nailing gun body  1  and a trigger safety device suitable for being mounted on the nailing gun body  1 , the nailing gun trigger safety device is arranged on the nailing gun body  1  and is linked with a trigger mechanism  50 , the nailing gun trigger safety device comprises a contact-jacking mechanism  20  and a poking mechanism  30  linked with the contact-jacking mechanism  20 , the contact-jacking mechanism  20  can be slideably mounted on a nozzle  11  of the nailing gun body  1 , the poking mechanism  30  is linked with the contact-jacking mechanism  20 , the nailing gun trigger safety device further comprises a transmission mechanism  40  linked with the trigger mechanism  50 , and the transmission mechanism  40  is respectively linked with the poking mechanism  30  and the trigger mechanism  50 . 
     With reference to the  FIG. 1 , according to the embodiments of the invention, the transmission mechanism  40  comprises a mounting rack  41  suitable for the arrangement on the nailing gun body  1 , a guide rod  42  movably mounted on the mounting rack  41  and a bending rod  43  linked with the guide rod  42 , the guide rod  42  is linked with the poking mechanism  30 , and the bending rod  43  is linked with the trigger mechanism  50 . 
     When the contact-jacking mechanism  20  is not pressed, the pressing sheet  51  is positioned at a first initial position and the air needle  54  is beyond the stroke of the pressing sheet. In this case, the trigger  52  is pulled, although the pressing sheet  51  finishes the stroke, the air needle  54  is beyond the stroke thereof, therefore, the air needle cannot be triggered. 
     With reference to the  FIG. 2 , when the trigger mechanism  50  is released, the contact-jacking mechanism  20  retracts towards the nailing gun body  1  under the push-against of the elastic member  22  and simultaneously pushes the poking mechanism  30  and the transmission mechanism  40  so as to push the pressing sheet  51  to a second initial position, and the air needle  54  is within the stroke of the pressing sheet  51 . 
     Specifically, When being pressed, the contact-jacking mechanism  20  pushes the front end part of the fork  32 , and since the pivot  34  of the fork  32  is pushed by the elastic member  33  and accordingly maintained at the front ends of the slide slots  35 , the fork  32  can rotate only. The rear end part of the fork  32  presses the front end of the guide rod  42 , and after the guide rod  42  rotates, the rear end thereof drives the bending rod  43  to move backwards. The bending rod  43  pushes the pressing sheet  51  to the second initial position, and the air needle  54  is within the stroke of the pressing sheet  51 . Afterwards, the air needle  54  is triggered by the pressing sheet by pulling the trigger  52  again. 
     With reference to the  FIG. 3 , when the trigger mechanism  50  is triggered in case that the contact-jacking mechanism  20  is not pressed, the pressing sheet  51  pushes the transmission mechanism  40  and the poking mechanism  30 , the front end of the contact-jacking mechanism  20  is not fixed at this moment and is pushed towards the front end of the nozzle  11  under the pushing of the poking mechanism  30 , and percussion cannot occur at this moment as the switch is not opened. 
     Specifically, under the situation that the contact-jacking mechanism  20  at the front part of the nozzle is not pressed, after the trigger  52  is pulled, the pressing sheet  51  pushes the bending rod  43  to move forwards, the guide rod  42  rotates clockwise to push the fork to rotate counterclockwise, and the front end part of the fork pushes the contact-jacking mechanism to move forwards, thereby achieving the effect that the pressing sheet  51  pushes the transmission mechanism  40  and the poking mechanism  30 , the front end of the contact-jacking mechanism  20  is not fixed yet at this moment and pushed towards the front end of the nozzle  11  under the pushing of the poking mechanism  30 . In this case, the air needle is positioned beyond the stroke of the pressing sheet  51  and cannot be triggered accordingly. 
     With reference to the  FIG. 4 , the contact-jacking mechanism  20  is pressed when being positioned at the position shown in the  FIG. 3 , and since the transmission mechanism  40  is obstructed under the air pressure of the switch at this moment, the poking mechanism  40  moves backwards along the slide slots of the bracket  31  neither poking the transmission mechanism  40  nor pushing the switch to cause percussion. 
     What is shown in the  FIG. 4  is regarded as further state of the state shown in the  FIG. 3 , under the situation that the contact-jacking mechanism  20  at the front part of the nozzle is not pressed, the trigger  52  is pulled and the contact-jacking mechanism is then pressed. And since the transmission mechanism  40  is obstructed under the air pressure of the switch at this moment, the pivot  34  of the fork  32  neutralizes the resistance of the elastic member  33  to move backwards inside the slide slots of the bracket  31 , neither poking the transmission mechanism  40  nor pushing the pressing sheet  51  of the switch to cause percussion. 
     Thus, it is obvious that the nailing gun equipped with the safe device according to the invention can achieve percussion only according to correct operation sequence, thereby enhancing the safety of the invention. With reference to the  FIG. 5 , when the contact-jacking mechanism  20  cannot be pushed forwards as the front end thereof is adhered to the working surface of an applied position, the contact-jacking mechanism  20  pushes the pressing sheet  51  to the second initial position via the poking mechanism  30  and the transmission mechanism  40 , and the air needle  54  is within the stroke of the pressing sheet. The switch is opened just by pulling the trigger mechanism  50  so as to cause percussion. 
     It is noteworthy that the detailed description specifically illustrates the technical proposals of the present patent application with the embodiments, however, the skilled in the art easily thinks of the detailed description, and changes and modifies the technical proposals of the present patent application based thereon, but not breaking away from a range summarized by the claims which are requested for protection by the present invention.