Abstract:
A firearm firing mechanism is so configured that a hammer is retaining by a front retaining block before pressing a trigger; pressing the trigger slightly at a first stage causes a main bar to bias a rear retaining block and the front retaining block backwardly at a relatively smaller angle to release the hammer in performing a single-shot action; pressing the trigger heavily at a second stage causes the main bar at a relatively longer distance so that the hammer is kept away from the front retaining block when it is returned, and the hammer is secured by the rear retaining block upon a backward displacement of a bolt and backward biasing of the hammer, and a linkage is forced to move the rear retaining block in releasing the hammer for firing when the bolt forward again, and a continuous multi-shot firing action is performed by means of repeating this operation. Thus, the invention enhances the operation convenience in achieving single-shot and multi-shot firing actions.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to firearm technology, and more particularly to a firearm system, which allows the trigger to be pressed slightly at a first stage to perform a single-shot firing action, or heavily at a second state to perform a continuous multi-shot firing action. 
         [0003]    2. Description of the Prior Art 
         [0004]    A large firearm generally provides a single-shot firing mode and a continuous multi-shot firing mode for section. Taiwan Patent Number 334844, Number M360726 (equivalent to China Patent Number ZL200920006985.3 or U.S. Pat. No. 7,878,196), and Number M371871 disclose similar designs. 
         [0005]    The aforesaid prior art designs commonly comprise a bolt, a hammer, a trigger, a hammer hook, a multi-shot control bar, and a switch. The switch is located at one side of the gun body, providing a switching lever. The gun body has an axle mounted therein. The axle provides a groove configured to match with the hammer hook, the multi-shot control bar, a ratchet wheel and a pawl to fit the operation of the trigger in performing a single-shot firing action or continuous multi-shot firing action. 
         [0006]    However, the arrangement of the switch, the axle, and the switching lever complicates the structure of the firearm. During operation to select the single-shot or continuous multi-shot firing mode, the user must bias the switching lever to shift the position of the groove of the axle. 
         [0007]    Further, Taiwan Patent Number M383111 (equivalent to China Patent Number ZL200920174472.3, U.S. Pat. No. 8,146,576 or European Patent Number 2,392,888) also discloses a firing actuator mechanism that provides a single-shot firing mode and a continuous multi-shot firing mode. However, the user must operate a selector block to switch between the single-shot firing mode and the continuous multi-shot firing mode. 
         [0008]    Furthermore, there is another design that has a rotary wheel provided at the bottom side of the trigger and rotatable to switch between a single-shot firing mode and a continuous multi-shot firing mode. However, the installation of the rotary wheel complicates the structural design. Further, the user must rotate the rotary wheel to select between the single-shot firing mode and the continuous multi-shot firing mode. 
         [0009]    Therefore, there is a strong demand for a firearm firing system providing a single-shot firing mode and a continuous multi-shot firing mode that has a simple structure and is convenient to operate. 
       SUMMARY OF THE INVENTION 
       [0010]    The present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide a firearm firing system, which has a simple structural design that enhances the operation convenience in achieving single-shot and multi-shot firing actions. 
         [0011]    To achieve this and other objects of the present invention, a firearm firing system, comprises a bolt, a hammer, a trigger, a rear retaining block and a front retaining block. The hammer comprises a side retaining lug located at a top side thereof and a hook located at a bottom side thereof. The trigger has a rod member pivotally connected to a top side thereof. The rear retaining block comprises a hook portion at one lateral side thereof. The front retaining block comprises a protruding portion located at a front side thereof. The hook of the hammer is hooked on the protruding portion of the front retaining block when the trigger is not pressed. The trigger is pressable to move the rod member forward and to further cause disengagement of the hook of the hammer from the protruding portion of the front retaining block, enabling the hammer to strike forward. The bolt is moved back to return the hammer and to force the side retaining lug of the hammer into engagement with the hook portion of the rear retaining block after the bullet-striking action of the hammer, and then the bolt is immediately moved forward after engagement between the side retaining lug and the hook portion. The rod member is moved back and the side retaining lug of the hammer is disengaged from the hook portion of the rear retaining block, and the hook of the hammer is forced into engagement with the protruding portion of the front retaining block after the trigger is released. The invention is characterized in that the rear retaining block further comprises a stub rod located at an opposite lateral side thereof; the front retaining block further comprises a top abutment portion; the firearm firing system further comprises a main bar having a front end thereof pivotally connected to the rod member; the main bar comprises a retaining portion located at a bottom side of an opposing rear end thereof; the retaining portion has a rear side stopped against the stub rod of the rear retaining block and a front side stopped against the top abutment portion of the front retaining block; the main bar is moved backward to bias the rear retaining block and the front retaining block backward for enabling the side retaining lug of the hammer to be hooked on the hook portion of the rear retaining block when the trigger is pressed to move the rod member forward; the rod member forces the main bar to bias the rear retaining block and the front retaining block forward when the trigger is released, causing the side retaining lug of the hammer to be disengaged from the hook portion of the rear retaining block and the hammer to move the hook into engagement with the protruding portion of the front retaining block. 
         [0012]    Further, the main bar comprises a rear top edge located at an opposing top side of the rear end, a recessed portion located at the top side of the rear end near said rear top edge, and a bevel edge located at the top side of the rear end and connected between the rear top edge and the recessed portion. The bevel edge has a relatively lower front side and a relatively higher rear side connected to the rear top edge. The firearm firing system further comprises a linkage disposed at an inner side relative to the main bar. The linkage comprises a front link and a rear link pivotally connected in line. The front link comprises a top lug. The rear link suspends above the rear retaining block, comprising a rear abutment portion and a bottom push portion. The rear abutment portion is disposed at the rear top edge of the main bar when the trigger is not pressed. The rear retaining block comprises an engagement portion disposed below the bottom push portion of the rear link. 
         [0013]    Further, the rear abutment portion of the rear link is disposed at the bevel edge of the main bar when the trigger is pressed to move the main bar backward in performing a single-shot firing action. The top lug of the front link is forced by the bolt to move the linkage forward, and the bottom push portion of the rear link is kept away from the rear retaining block during a forward displacement of the bolt. 
         [0014]    Further, the rear abutment portion of the rear link is disposed at the recessed portion of the main bar when the trigger is pressed to move the main bar backward in performing a continuous multi-shot firing action. The top lug of the front link is forced by the bolt to move the linkage forward and the bottom push portion of the rear link is forced to push the rear retaining block and to further force the hook portion of the rear retaining block away from the side retaining lug for enabling the hammer to be returned upon a forward displacement of the bolt. The hook of the hammer is kept away from the protruding portion of the front retaining block when the hammer is returned. 
         [0015]    Preferably, the linkage further comprises a spring member stopped against one end of the rear link opposite to the front link of the linkage for returning the linkage after the linkage having been moved forward. 
         [0016]    Preferably, the firearm firing system further comprises a follower block supported on a pressure ball to press on a rear side of the front retaining block in such a manner that when the trigger is pressed to move the main bar backward, the front retaining block is forced to push follower block backward, and the follower block is forced to impart a pressure to the pressure ball during a backward displacement of the main bar to perform a continuous multi-shot firing action. 
         [0017]    Preferably, the follower block comprises a bevel portion disposed at the rear side thereof and kept in contact with the pressure ball, and adapted to impart a pressure to the pressure ball upon a backward movement of the front retaining block to push the follower block. 
         [0018]    In general, the invention provides a firearm firing system so configured that when the user presses the trigger slightly at the first stage or heavily at the second stage, the main bar will be moved backward at a different distance to bias the rear retaining block and the front retaining block at a different biasing angle, driving the bolt to carry the link forward in or without moving the rear retaining block forward. Thus, when the hammer is returned, it will be forced into engagement with the rear retaining block and the front retaining block at a different condition to achieve a single shot firing action or multi-shot firing action without any other switching operation. Thus, the invention facilitates firearm firing operation and eliminates the operation drawbacks of conventional designs, and the value of the firearm constructed in accordance with the present invention is greatly enhanced. 
         [0019]    Other advantages and features of the present invention will be fully understood by reference to the following specification in conjunction with the accompanying drawings, in which like reference signs denote like components of structure. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0020]      FIG. 1  is an elevational view illustrating firearm equipped with firing system in accordance with the present invention. 
           [0021]      FIG. 2  is an elevational view of the firing system shown in  FIG. 1  and an enlarged view of a part of the firing system. 
           [0022]      FIG. 3  is an exploded view of the firing system in accordance with the present invention. 
           [0023]      FIG. 4  is a schematic plain view of the present invention, illustrating the status of the firearm firing system when the trigger is not pressed. 
           [0024]      FIG. 5  is an enlarged view of a part of  FIG. 4 . 
           [0025]      FIG. 6  is a schematic plain view of the present invention, illustrating the status of the firearm firing system when the trigger is pressed slightly at a first stage. 
           [0026]      FIG. 7  is an enlarged view of a part of  FIG. 6 . 
           [0027]      FIG. 8  corresponds to  FIG. 7 , illustrating the bolt moved backward after triggering of the trigger. 
           [0028]      FIG. 9  corresponds to  FIG. 8 , illustrating the bolt moved forward again. 
           [0029]      FIG. 10  is a schematic plain view and an enlarged partial view of the present invention, illustrating the status of the firearm firing system when the trigger is pressed heavily at a second stage. 
           [0030]      FIG. 11  is an enlarged view of a part of  FIG. 10 . 
           [0031]      FIG. 12  corresponds to  FIG. 11 , illustrating the bolt moved forward. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0032]    Referring to  FIGS. 1-3 , a firearm firing system used in a firearm in accordance with the present invention is shown comprising a bolt  1 , a hammer  2 , a trigger  3 , a main bar  4 , a rear retaining block  5 , a front retaining block  6 , a linkage  7 , and a follower block  8 . 
         [0033]    The bolt  1  will be moved forward upon a firing operation, and then immediately moved back to preserve a forward return force subject to the effect of a compressed intake gas. 
         [0034]    The hammer  2  comprises a side retaining lug  21  located at a top side thereof and a hook  22  located at a bottom side thereof. When the bolt  1  is moved backward, it presses the hammer  2 , causing the hammer  2  to preserve a forward return force. When the user presses the trigger  3 , the hammer  2  is released from the constraint to drop, thereby firing the bullet. 
         [0035]    The trigger  3  comprises a rod member  31  pivotally connected to a top side thereof (see  FIG. 2 ), and a swivel connector  30  pivotally coupled between a distal end of the rod member  31  and one end of the main bar  4 . When the user presses the trigger  3 , the rod member  31  is moved forward. On the contrary, when the user releases the trigger  3 , the rod member  31  is moved backward to its former position. Further, the distal end of the rod member  31  is pivotally connected to one side of the swivel connector  30 . 
         [0036]    The main bar  4  has a front end thereof pivotally connected to an opposite side of the swivel connector  30  (see  FIG. 2 ). When the user presses the trigger  3 , the rod member  31  is moved forward, causing the swivel connector  30  to move the main bar  4  backward. On the contrary, when the user releases the trigger  3 , the rod member  31  is moved backward, causing the swivel connector  30  to move the main bar  4  forward. The main bar  4  comprises a retaining portion  41  made in the form of a bottom-open notch and located at a bottom side of an opposing rear end thereof (see  FIG. 3 ), a rear top edge  44  located at an opposing top side of the rear end, a recessed portion  42  located at the top side of the rear end near the rear top edge  44 , and a bevel edge  43  located at the top side of the rear end and connected between the rear top edge  44  and the recessed portion  42 . The bevel edge  43  has a relatively lower front side connected to the recessed portion  42 , and a relatively higher rear side connected to the rear top edge  44 . 
         [0037]    The rear retaining block  5  has a bottom end thereof pivotally mounted in the firearm, and is capable of providing a backward-basing return force. The rear retaining block  5  comprises a hook portion  51  located one lateral side of an opposing top end thereof (see  FIG. 2 ), a stub rod  52  located an opposite lateral side of the top end (see  FIG. 3 ), and an engagement portion  53  located at a rear side of the top end. When the hammer  2  is biased backward, the side retaining lug  21  of the hammer  2  will be forced into engagement with the hook portion  51  of the rear retaining block  5  (see  FIG. 8 ), and the stub rod  52  of the rear retaining block  5  will be pressed on a rear end of the retaining portion  41  of the main bar  4  (see  FIG. 4 ). Thus, when the main bar  4  is moved backward, the rear retaining block  5  will be turned backward. 
         [0038]    The front retaining block  6  has a bottom end thereof pivotally mounted in the firearm and is capable of providing a forward-basing return force. The front retaining block  6  comprises a protruding portion  61  located at a front side thereof, and a top abutment portion  62  located at an opposing top end thereof. The top abutment portion  62  is forwardly abutted against an opposing front end of the retaining portion  41  of the main bar  4  (see  FIG. 4 ). Thus, when the main bar  4  is moved backward, the front retaining block  6  will be forced to bias backward and to preserve a forward return force; when the main bar  4  is moved forward, the side retaining lug  21  of the hammer  2  will be released from the hook portion  51  of the rear retaining block  5 , and the hook  22  of the hammer  2  will be forced into engagement with the protruding portion  61  of the front retaining block  6  when the hammer  2  is moved back (see  FIGS. 4 and 5 ). 
         [0039]    The linkage  7  is mounted at an inner side relative to the main bar  4 , comprising a front link  71  having opposing front and rear ends, a rear link  72  having a front end thereof pivotally connected to the rear end of the front link  71  (see  FIGS. 3 and 4 ), and a spring member  73  provided at an opposing rear end of the rear link  72 . The front link  71  has a top lug  711  located at the front end thereof remote from the rear link  72 . When the bolt  1  is moved forward, it will hook on the top lug  711  to push the linkage  7  forward. The rear link  72  has the rear end thereof connected to the spring member  73 . The spring member  73  is adapted to pull back the linkage  7  after the linkage  7  having been pushed forward. Further, the rear end of the rear link  72  is suspending above the rear retaining block  5 . Further, the rear link  72  has a rear abutment portion  721  located at the rear end thereof. When the trigger  3  is not pressed, the rear abutment portion  721  will be moved to the rear top edge  44  of the main bar  4  (see  FIG. 4 ). Pressing the trigger  3  slightly at a first stage to move the main bar  4  backward in a relatively shorter distance in performing a single-shot operation, the rear abutment portion  721  will be moved to the bevel edge  43  of the main bar  4  (see  FIG. 6 ). The rear link  72  further has a push portion  722  located at a bottom side thereof and disposed above the engagement portion  53  of the rear retaining block  5  (see  FIG. 7 ), i.e., moving the linkage  7  forward or backward does not cause the rear retaining block  5  to bias. Pressing the trigger  3  heavily at a second stage to move the main bar  4  backward in a relatively longer distance in performing a multi-shot operation, the rear abutment portion  721  will be moved to the recessed portion  42  of the main bar  4  (see  FIG. 10 ). At this time, the push portion  722  of the rear link  72  is moved to the rear side of the engagement portion  53  of the rear retaining block  5  (see  FIG. 12 ). When the bolt  1  is moved forward at this time, it will hook on the top lug  711  to push the linkage  7  forward, causing the push portion  722  of the rear link  72  to push the rear retaining block  5  to the position where the hook portion  51  of the rear retaining block  5  is disengaged from the side retaining lug  21  of the hammer  2 , and thus the hammer  2  can be returned. Further, because the backward stroke of the main bar  4  is relatively longer at this time, the front retaining block  6  can be biased through a relatively larger angle. Thus, the hook  22  is kept away from the protruding portion  61  when the hammer  2  is pressed and then returned. 
         [0040]    The follower block  8  is forwardly and elastically pressed on the rear side of the front retaining block  6 , having a pressure member, for example, pressure ball  81  attached to a rear side thereof (see  FIG. 2 ) and supported on an elastic member  82 . Further, the follower block  8  has a bevel portion  83  defined in the rear side thereof. When pressing the trigger  3  to move the main bar  4  backward, the front retaining block  6  will be forced to push the follower block  8  backward. Further, when pressing the trigger  3  heavily at the second stage to move the main bar  4  backward in a relatively longer distance in performing a multi-shot operation, the bevel portion  83  of the follower block  8  will be forced against the pressure ball  81  to compress the elastic member  82 . At this time, the trigger  3  receives a pressure from the follower block  8 , giving a warning signal to the user pressing the trigger  3  to prevent an accidental heavy pressing operation. 
         [0041]    Thus, when the trigger  3  is not pressed, the hook  22  of the hammer  2  is secured to the protruding portion  61  of the front retaining block  6  (see  FIG. 4 ). When the trigger  3  is slightly pressed at the first stage (see  FIGS. 6 and 7 ), the main bar  4  is moved backward to disengage the hook  22  from the protruding portion  61  of the front retaining block  6 , enabling the hammer  2  to strike forward, and the bolt  1  is then moved back subject to the effect of a compressed intake gas. At this time, the back stroke of the main bar  4  is short, and a single-shot firing action is performed, causing the rear abutment portion  721  to be stopped at the bevel edge  43  of the main bar  4  (see  FIG. 6 ) and the rear retaining block  5  and the front retaining block  6  to be moved backward with the main bar  4 . After the backward displacement of the bolt  1 , the side retaining lug  21  of the hammer  2  is forced into engagement with the hook portion  51  of the rear retaining block  5  (see  FIG. 8 ). Thereafter, the user releases the trigger  3 , allowing the main bar  4  to be moved forward to its former position (see  FIG. 9 ). At this time, the rear retaining block  5  and the front retaining block  6  swing forward, causing the hook portion  51  to be disengaged from the side retaining lug  21  of the hammer  2  (see also  FIG. 8 ), and thus the hammer  2  swings forward immediately. After the hammer  2  swings back, the hook  22  of the hammer  2  is immediately hooked on the protruding portion  61  to the standby position (see  FIGS. 4 and 9 ) for a nest firing operation. This is the performance of a single-shot firing action. 
         [0042]    When the trigger  3  is heavily pressed at the second stage (see  FIG. 10 ), the main bar  4  is moved backward at a relatively longer distance, causing the front retaining block  6  to push the follower block  8  backwardly against the pressure ball  81  and the elastic member  82  (see  FIGS. 2 and 10 ). At this time, the user&#39;s finger feels a pressure, and thus, a warning effect is established. At this time, the rear abutment portion  721  is shifted from the bevel edge  43  to the recessed portion  42  (see  FIG. 10 ), causing the main bar  4  to bias the front retaining block  6  at a relatively larger swing angle (see  FIGS. 6 and 10 ). At this time, the push portion  722  of the rear link  72  is disposed at the rear side of the engagement portion  53  of the rear retaining block  5 . After backward displacement of the bolt  1  to force the hammer  2  backward, the side retaining lug  21  of the hammer  2  immediately hooks on the hook portion  51  of the rear retaining block  5  (see  FIG. 11 ). Thereafter, the bolt  1  is moved forward to hook on the top lug  711  and to further move the linkage  7  forward (see  FIG. 12 ). At the same time, the push portion  722  of the rear link  72  pushes the rear retaining block  5  to move the hook portion  51  of the rear retaining block  5  away from the side retaining lug  21  of the hammer  2  (see  FIGS. 11 and 12 ), enabling the hammer  2  to move back at a rush, thereby firing a bullet (not shown). At this time, the hook  22  is kept away from the protruding portion  61 . If the trigger  3  is kept heavily pressed, the bolt  1  will be moved backward to bias the hammer  2  again, enabling the hammer  2  to be biased back and forth to achieve a multi-shot firing action. The main bar  4  will be moved forward to the standby position only after the user releases the trigger  3 . 
         [0043]    As stated above, when the user presses the trigger  3  slightly at the first stage or heavily at the second stage, the main bar  4  will be moved backward at a different distance to bias the rear retaining block  5  and the front retaining block  6  at a different biasing angle, driving the bolt  1  to carry the link  7  forward in or without moving the rear retaining block  5  forward. Thus, when the hammer  2  is returned, it will be forced into engagement with the rear retaining block  5  and the front retaining block  6  at a different condition to achieve a single shot firing action or multi-shot firing action without any other switching operation. Thus, the invention facilitates firearm firing operation and eliminates the operation drawbacks of conventional designs, and the value of the firearm constructed in accordance with the present invention is greatly enhanced. 
         [0044]    Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.