Abstract:
A trigger may be pivotally connected to a frame at or near the top of the trigger. A sear transfer bar may be further provided and is pivotally connected to the frame. The pivot in the trigger is higher within the frame as compared to the pivot of the sear transfer bar. Two balls can be between the trigger and the sear transfer bar. The top of the sear transfer bar has a sear contact. Pulling the trigger in a first direction causes the trigger to rotate in a first direction. The sear transfer bar rotates under force of the trigger. The sear transfer bar and the trigger may rotate in opposite directions. The sear will drop when the sear contact of the transfer bar ceases engagement with the sear, causing the firearm to fire. The trigger assembly has a control arm extending beyond the trigger assembly frame.

Description:
This application is a continuation-in-part application of pending United States patent application filed on Oct. 3, 2008 and having application Ser. No. 12/245,479, which itself is a non-provisional application that claims priority on and the benefit of provisional application 60/998,009 filed Oct. 5, 2007, the entire contents of each hereby being incorporated herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a trigger assembly that can serve as a replacement trigger assembly for a Remington 700 rifle trigger assembly and for other rifles. 
     2. Description of the Related Art 
     The Remington 700 rifle is a well regarded firearm. The trigger assembly does generally work well for its intended purposes. Yet, there are some aspects of the trigger assembly that can be improved upon. 
     The Remington 700 rifle trigger assembly has a trigger that is pivotally housed within a housing. The trigger has a finger element and a head. The head has a top and a bottom, with the finger element being integral with the bottom of the head. A pivot hole is formed through the head near the bottom of the head. In this arrangement, pulling the finger element in a first angular direction causes the top of the head to move in the opposite angular direction about the pivot. A sear connect is at the top of the head. When the head rotates a given amount, the sear contact disengages the sear. 
     One drawback with this arrangement is that the pivot is approximately ½ way between the top of the head and the bottom of the finger element. In this regard, the force applied in the first direction by the user creates a torque on the trigger about the pivot. The created lever arm is less than optimal, as it is approximately equal to ½ of the trigger length. Having a short lever arm can lead to a decrease in the accuracy of the trigger assembly. Reasons for this include the geometry of pulling a short lever, which includes an undesirable ratio in the amount of vertical swing relative horizontal movement. 
     A further drawback is that the safety engages only the sear. While a safety engaging a single component can be adequate, it would be more desirable to have a safety engage multiple components in the trigger assembly to provide additional security in guarding against unintentional discharges. 
     There is a need for a trigger assembly that is adjustable between light and heavy. 
     There is a need for a trigger assembly that has low internal friction. 
     There is a need for a trigger assembly that is easily adapted for use as a single stage and a double stage trigger assembly. 
     There is a need for a trigger assembly that utilizes an increased lever arm for increased precision while maintaining a compact overall size. 
     There is a need for a trigger assembly with additional safety features. 
     There is a need for a trigger assembly that can act as a set trigger. 
     Thus there exists a need for a trigger assembly that solves these and other problems. 
     SUMMARY OF THE INVENTION 
     The present invention relates to a trigger assembly that can serve as a replacement trigger assembly for a Remington 700 rifle and other rifles. The trigger assembly can have a frame with a first side and a second side. Two spacer blocks can maintain spacing between the sides. A sear can be secured within the frame, and in particular pivotally secured at the front of the sear. A trigger can be provided. The trigger can be pivotally connected to the frame at or near the top of the trigger. A sear transfer bar can be further provided. The sear transfer bar is also pivotally connected to the frame. The pivot in the trigger may be higher within the frame as compared to the pivot of the sear transfer bar. One or more antifriction devices can be between the trigger and the sear transfer bar. The top of the sear transfer bar has a sear contact. Pulling the trigger in a first direction causes the trigger to rotate in a first direction. The trigger can cause the sear transfer bar to rotate after the trigger has rotated a defined amount, wherein pulling the trigger further causes the sear transfer bar to rotate. The sear will drop when the sear contact ceases engagement with the sear, causing the firearm to fire. 
     According to one advantage of the present invention, the trigger assembly is adjustable between light and heavy. This can be accomplished in several ways. In one embodiment, springs are provided for tensioning the trigger. In another embodiment, magnets are provided for tensioning the trigger. A light trigger can have a trigger pull of approximately 1 pound. A heavy trigger can have a trigger pull in the range of approximately 3 to 5 pounds. The trigger pull of the present invention is adjustable. 
     According to another advantage of the present invention, the trigger assembly has low internal friction. This is accomplished by selectably placing one or more antifriction devices between the trigger and the sear transfer bar. In one preferred embodiment, the antifriction devices can comprise ball bearings. 
     According to a further advantage of the present invention, the trigger assembly is easily adapted for use as a single stage and a double stage trigger assembly. This is accomplished in a preferred embodiment by selectably placing one or two antifriction devices between the trigger and the sear contact bar. The geometry of the engagement points between the trigger and the sear transfer bar determine the location and characteristics of the two stages. 
     According to a still further advantage yet of the present invention, the trigger assembly is utilizes an increased lever arm for increased precision while maintaining a compact overall size. This is accomplished by locating the trigger pivot at or near the top of the trigger such that the effective length of the trigger lever arm is maximized. Increasing the lever arm length can increase the trigger torque and reduce the force required to discharge the firearm. An increased lever arm length decreases the proportional or rational vertical component of the trigger swing. 
     According to a still further advantage yet of the present invention, the trigger assembly has a sear transfer bar with a radiused sear contact. The radiused sear contact provides a constant distance between the perimeter of the sear contact and the sear as the sear transfer bar rotates about its pivot. The sear, accordingly, will not travel until the sear contact clears and allows the sear to drop. 
     According to a still further advantage yet of the present invention, the trigger assembly is provided with a safety that acts as a double safety. This is accomplished by having a safety with one lug preventing the sear from dropping and a second lug preventing the sear transfer bar from pivoting out of the way of the sear. 
     According to a still further advantage yet of one embodiment of the present invention, the trigger can be configured to act as a set trigger. Friction between the sear transfer bar and the sear will hold the sear transfer bar in the set position between the first stage and the second stage. The trigger assembly can be un-cocked by toggling the safety to the safe position. 
     Other advantages, benefits, and features of the present invention will become apparent to those skilled in the art upon reading the detailed description of the invention and studying the drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side view of a first preferred embodiment of the present invention shown in a ready position. 
         FIG. 2  is a side view of the embodiment shown in  FIG. 1  shown in the stage  1  position. 
         FIG. 3  is a side view of the embodiment shown in  FIG. 1  shown in the stage  2  position. 
         FIG. 4  is a side view of the embodiment shown in  FIG. 1  shown in the fired or safety off position. 
         FIG. 5  is a side view of the embodiment shown in  FIG. 1  shown in the safety on position. 
         FIG. 6  is an isolated rear view of the trigger. 
         FIG. 7  is a side view of an alternative embodiment of the present invention. 
         FIG. 8  is a side view of an alternative embodiment of the present invention in a safety on position. 
         FIG. 9  is similar to  FIG. 8 , but is illustrated in a safety off position. 
         FIG. 10  is an exploded side view of a preferred embodiment of a safety of the present invention. 
         FIG. 11  is an end view showing a preferred key of a control arm. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     While the invention will be described in connection with several preferred embodiments, it will be understood that it is not intended to limit the invention to those embodiments. On the contrary, it is intended to cover all alternatives, modifications and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims. 
     The present invention can be used with a Remington 700 rifle, and with similar style rifles. In a basic configuration, the firearm has a barrel with a longitudinal axis. The firearm has a cocking piece  1  with a cocking piece contact  2 . The cocking piece  1  fires when the cocking piece contact  2  clears the sear (described below). 
     Turning now to  FIGS. 1-5 , a first preferred embodiment of a trigger assembly  10  is provided. The trigger assembly  10  can be a direct replacement for a standard assembly. The trigger assembly  10  has a frame  20 , a front spacer block  40 , a rear spacer block  50 , a sear  60 , a trigger  80 , a sear transfer bar  100  and a safety  120 . Each of these components is described in detail below. 
     The frame  20  has a first side and an opposed second side. Plates can be used on the sides to contain the other components of the housing. In the illustrated embodiment, one plate is removed to more clearly illustrate the components of the trigger assembly  10 . The frame  20  comprises a top  25  and a bottom  26 , a front  27  and a rear  28 . A first hole  29  is through the frame  20 . Hole  29  is preferably near the top  25  and front  27  of the frame  20 . A second hole  30  is also provided. The second hole  30  is preferably near the top  25  and rear  28  of the frame  20 . In one embodiment, the mount hole is round. In an alternative embodiment, the mount hole can comprise a single hole defined by two offset circles forming a double crescent hole. This allows the present assembly to be used with multiple firearms and in particular with firearms having the similar but different frame requirements. Mounting pins (not shown) can be received within holes  29  and  30  to hold and secure the frame  20  in place within the firearm. 
     The front spacer block  40  is located at the front  25  of the frame between the two sides. The block  40  has a top  41  with a pocket  42  formed therein. The pocket receives the end of a spring  131 . One preferred spring is a simple coil spring. It is appreciated that the spring is but one example of a force member that may be utilized within the present invention. The block  40  further has a bottom  43 , a front  44  and a rear  45 . A hole  46  can be formed through the block  40  and be open to the front  44  and rear  45 . The hole  46  is preferably a threaded hole and can receive a set screw  47 . The screw  47  can extend from the rear of the spacer block  40  to adjust trigger creep. It is appreciated that an additional hole (not shown) may also provided for receiving an embedded switch, such as a proximity switch for use with an integrated laser rangefinder (LRF) sight system. 
     Spacer block  50  is at the rear  28  of the frame. The block  50  has a top  51  with a pocket  52  formed therein. The pocket can receive one end of a spring  133 . One preferred spring is a simple coil spring. The block  50  further has a bottom  53 . 
     The first spacer block  40  and the second spacer block  50  maintain proper spacing of the side plates of the trigger assembly. 
     The sear  60  may be similar to a standard sear used in the Remington 700 rifles. The sear  60  is located at the top  25  of the frame  20 . The sear  60  has a front  61  and a rear  62 , a top  63  and a bottom  64 . An area  65  along the bottom  64  of the sear is relieved to make clearance during the fired or safety off position described below. A hole or pocket  66  is formed in the bottom  64  of the sear  60 . The second end of spring  131  can be received within hole  66 . The spring  131  provides a force against the sear  60  so that the top rear portion of the sear rests against a pin that supports the housing. The sear has a sear contact  67 . The sear contact  67  is at the bottom of the sear  60  between the front and the rear of the sear. A safety ear  68  is also provided. The ear  68  is at the bottom and rear of the sear. A pivot  69  is provided. The pivot hole is concentric with mounting hole  29  through the frame, wherein the mounting pin passes through both holes. The sear  60  can be in a first position and a second position. In the first position, the sear  60  can be engaged by the cocking piece. In this regard, the cocking piece contact  2  of the cocking piece  1  can engage a cocking piece contact  70  of the sear  60 . The cocking piece contact  2  of the cocking piece  1  can move past the sear  60  when the sear drops to its second position (shown in  FIG. 4 ). A clearance step  71  can be provided to prevent interference between the sear  70  and cocking piece when the firearm is fired. 
     A trigger  80 , as seen in  FIGS. 1-6 , is further provided. The trigger  80  has a finger element  81  and an arm  90 . The finger element  81  and arm  90  are preferably integrally formed as a single component. The finger element  81  has a top  82  and a bottom  83 . The finger element  81  further has a front  84  and a rear  85 . During use, the user applies a rearward force to the finger element by pulling against the front  84  surface. The finger element  81  further has a first side  86  and a second side  87 . A lip  88  projects forward at the top  82  of the finger element  81 . The lip  88  acts to prevent dust, dirt and other debris from entering the internal chamber of the trigger assembly  10  by coming into close engagement with the spacer block  40  in the ready position. 
     The trigger  80  further has an arm  90 . Arm  90  has a top  91 , a bottom  92 , a front  93  and a rear  94 . A pivot hole  95  is through the trigger between the sides. The pivot hole  95  is located near or adjacent to the top  91  of the arm  90  of the trigger  80 . The lever arm of the trigger  80  is effectively maximized. In this regard, the radius of rotation is approximately equal to the length of the trigger, resulting in minimum vertical variation of the trigger as it horizontally moves to the fired position. 
     A first channel  96  and a second channel  98  are provided between the sides of the arm, and are open to the rear  94  of the arm  90 . In this regard, the channels  96  and  98  generally resemble the shape of a C. A ball  97  is received within channel  96 , and a ball  99  is received within channel  98 . The balls project a selected distance rearward from the back  94  of the arm  90  of the trigger  80 . It is appreciated that having two balls results in a two-stage trigger. It is within the scope of the present invention to eliminate one ball, which would result in a single stage trigger. It is further appreciated that balls are but one example of a balled or rounded surface that could reduce friction between the components. 
     A pocket  100  is formed at the bottom  92  of the arm and is open to the rear  94 . The pocket can receive an end of a spring  132 . 
     A sear transfer bar  110 , or simply transfer bar, is further provided. The sear transfer bar  110  has a top  111 , a bottom  112 , a front  113  and a rear  114 . A pivot hole  115  is through the bar  110  at a point approximately half way between the top  111  and bottom  112 . It is understood that the location of the pivot of the transfer bar  110  may be moved without departing from the broad aspects of the present invention. A pocket  116  is formed in the transfer bar at the bottom  112  and is open to the front  113 . The second end of spring  132  is received within pocket  116 . A sear engager  117  is also provided. The sear engager  117  preferably comprises a radiused edge that contacts the sear contact  67  of the sear  60 . The sear engager  117  maintains constant location of the sear regardless of the rotational orientation of the bar  110 . A safety ear  118  is provided of the bar  110 . The safety ear  118  is preferably on the rear  114  of the bar between the top  111  and the bottom  112 . 
     Spring  132  applies a force to the bottom of the transfer bar  110  and bias the back of the transfer bar to against the safety or the second mounting plate. The spring force is overcome by the force of the trigger contacting the transfer bar when the trigger reaches a determined geometric location. Spring  132  remains in compression after the firearm fires and provides a force to force the bottom  112  of the bar  110  away from the released trigger  80  so that the sear contact  67  of the sear  60  and the sear engager  117  of the transfer bar can reengage. 
     During the step of pulling the trigger, the trigger can move from the first stage through the second to be in the set position. It is seen that the two balls  97  and  99  of the trigger  80  engage the transfer bar  110  in  FIG. 2 , which shows the end of the first stage. Further pulling of the trigger  80  ( FIG. 3 ) results in only the second ball  99  contacting the transfer bar. At this point, further rotation of the trigger  80  about the pivot  95  will result in the ball  99  applying a greater force to the transfer bar  110  than the spring  132  applies. Since the ball  99  contacts the transfer bar  110  above pivot  115 , and the spring  132  acts below the pivot, further movement of the trigger will cause the transfer bar  110  to rotate about pivot  115 . It is understood that the trigger and the transfer bar will rotate in opposite directions because the trigger contacts the transfer bar above the center of rotation. It is further understood that the contact between the trigger and contact bar may occur below the transfer bar pivot, which would result in the trigger and transfer bar rotation in offset tandem without departing from the broad aspects of the present invention. The sear engager  115  of the transfer bar  110  will cease engagement with the sear contact  67  of the sear  60  when the transfer bar rotates, causing the sear second end  62  to drop and the firearm to fire. 
     It is appreciated that other low friction interfaces can be used between the trigger  80  and sear transfer bar  110  without departing from the broad aspects of the present invention. For example, the balls could be located in the transfer bar  110  instead of the trigger  80  without departing from the broad aspects of the present invention. 
     A safety  120  is still further provided yet. The safety  120  is preferably a double safety, and accordingly engages at least two internal components of the trigger assembly. The safety has a pivot  121 . A control arm  122  is provided for toggling the safety  120  between a safe position and a ready position. The control arm  122  can be justified for a left-handed shooter and for a right-handed shooter. A first lug  123  is provided for engaging the safety ear  118  of the transfer bar  110 . A second lug  124  is also provided for engaging safety ear  68  of the sear  60 . With the safety  120  in the safe position, lug  123  prevents the transfer bar from rotating (hence maintaining engagement between the sear engager  117  of the transfer bar  110  and the sear contact  67  of the sear), and lug  124  directly prevents the sear  60  from dropping. When the firearm is in the set position, the trigger assembly can be uncocked by placing the safety to the safe position. In this regard, lug  123  presses against ear  118  of the bar  110  to rotate bar  110  about pivot  105  away from the set position. Two detents  125  and  126  are provided. A safety ball  140 , or simply a ball, is further provided. The ball  140  rests on a spring  133  that is within pocket  52  in the spacer block  50 . The ball engages detent  125  when the trigger assembly is not in the safety on position, and engages detent  126  when the trigger assembly is in the safety on position. The control arm  122  is used to effect the toggling between the detents  125  and  126 , wherein spring  133  is temporarily compressed to allow the ball to move between the detents. 
     Turning now to  FIG. 7 , a second preferred embodiment of a trigger assembly  210  is provided. The trigger assembly  210  can be a direct replacement for a standard assembly. The trigger assembly  210  has a frame  220 , a front spacer block  240 , a rear spacer block  250 , a sear  260 , a trigger  280 , a sear transfer bar  300  and a safety  320 . Each of these components is described in detail below. 
     The frame  220  has a first side and an opposed second side. Plates can be used on the sides to contain the other components of the housing. In the illustrated embodiment, one plate is removed to more clearly illustrate the components of the trigger assembly  210 . The frame  220  comprises a top and a bottom, a front and a rear. A first hole is through the frame  220 . Hole is preferably near the top and front of the frame  220 . A second hole is also provided. The second hole is preferably near the top and rear of the frame  220 . In one embodiment, the mount hole is round. In an alternative embodiment, the mount hole can comprise a single hole defined by two offset circles forming a double crescent hole. This allows the present assembly to be used with multiple firearms and in particular with firearms having the similar but different frame requirements. Mounting pins (not shown) can be received within holes and to hold and secure the frame  220  in place within the firearm. 
     The front spacer block  240  is located at the front of the frame between the two sides. The block  240  has a top  241  with a pocket  242  formed therein. The block  240  further has a bottom, a front and a rear. A hole can be formed through the block  240  and be open to the front and rear. The hole is preferably a threaded hole and can receive a set screw. The screw can extend from the rear of the spacer block  240  to adjust trigger creep. It is appreciated that an additional hole (not shown) may also provided for receiving an embedded switch, such as a proximity switch for use with an integrated laser rangefinder (LRF) sight system. 
     Spacer block  250  is at the rear of the frame. The block  250  has a top  251  with a pocket  252  formed therein. The block  250  further has a bottom. 
     The first spacer block  240  and the second spacer block  250  maintain proper spacing of the side plates of the trigger assembly  210 . 
     The sear  260  may be similar to a standard sear used in the Remington 700 rifles. The sear  260  is located at the top of the frame  220 . The sear  260  has a front  261  and a rear  262 , a top  263  and a bottom  264 . An area along the bottom  264  of the sear is relieved to make clearance during the fired position. A hole or pocket  266  is formed in the bottom  264  of the sear  260 . The sear has a sear contact. The sear contact is at the bottom of the sear  260  between the front and the rear of the sear. A safety ear is also provided. The ear is at the bottom and rear of the sear. A pivot  269  is provided. The pivot hole is concentric with mounting hole through the frame, wherein the mounting pin passes through both holes. The sear  260  can be in a first position and a second position. In the first position, the sear  260  can be engaged by the cocking piece. In this regard, the cocking piece contact of the cocking piece can engage a cocking piece contact of the sear  260 . The cocking piece contact of the cocking piece can move past the sear  260  when the sear drops to its second position. A clearance step can be provided to prevent interference between the sear  270  and cocking piece when the firearm is fired. 
     A trigger  280  is further provided. The trigger  280  has a finger element  281  and an arm  290 . The finger element  281  and arm  290  are preferably integrally formed as a single component. The finger element  281  has a top and a bottom. The finger element  281  further has a front and a rear. During use, the user applies a rearward force to the finger element by pulling against the front surface. The finger element  281  further has a first side and a second side. A lip projects forward at the top of the finger element  281 . The lip acts to prevent dust, dirt and other debris from entering the internal chamber of the trigger assembly  210  by coming into close engagement with the spacer block  240  in the ready position. 
     The trigger  280  further has an arm  290 . Arm  90  has a top, a bottom, a front  293  and a rear  294 . A pivot hole  295  is through the trigger between the sides. The pivot hole  295  is located near the top of the arm  290  of the trigger  280 . The lever arm of the trigger  280  is effectively maximized. In this regard, the radius of rotation is approximately equal to the length of the trigger, resulting in minimum vertical variation of the trigger as it horizontally moves to the fired position. 
     A first channel and a second channel are provided between the sides of the arm, and are open to the rear of the arm  290 . In this regard, the channels generally resemble the shape of a C. A ball is received within channel, and a ball is received within channel. The balls project a selected distance rearward from the back of the arm  290  of the trigger  280 . It is appreciated that having two balls results in a two-stage trigger. It is within the scope of the present invention to eliminate one ball, which would result in a single stage trigger. A pocket  300  is formed at the bottom of the arm and is open to the rear. 
     A sear transfer bar  310  is further provided. The sear transfer bar  310  has a top, a bottom, a front  313  and a rear  314 . A pivot hole  315  is through the bar  310  at a point approximately half way between the top and bottom. A pocket  316  is formed in the transfer bar at the bottom and is open to the front. A sear engager is also provided. The sear engager preferably comprises a radiused edge that contacts the sear contact of the sear  260 . The sear engager maintains constant location of the sear regardless of the rotational orientation of the bar  310 . A safety ear is provided of the bar  310 . The safety ear is preferably on the rear of the bar between the top and the bottom. 
     During the step of pulling the trigger, the trigger can move from the first stage through the second to be in the set position. The two balls of the trigger  280  may engage the transfer bar  310 , which occurs at the end of the first stage. Further pulling of the trigger  280  results in only the second ball contacting the transfer bar. At this point, further rotation of the trigger  280  about the pivot  295  will result in the ball applying a greater force to the transfer bar  310  than the forcing component (described below) applies. Since the ball contacts the transfer bar  310  above pivot  315 , and the forcing component acts below the pivot, further movement of the trigger will cause the transfer bar  310  to rotate about pivot  315 . The sear engager of the transfer bar  310  will cease engagement with the sear contact of the sear  260  when the transfer bar rotates, causing the sear second end to drop and the firearm to fire. 
     It is appreciated that other low friction interfaces can be used between the trigger  280  and sear transfer bar  310  without departing from the broad aspects of the present invention. For example, the balls could be located in the transfer bar  310  instead of the trigger  280  without departing from the broad aspects of the present invention. 
     A safety  320  is still further provided yet. The safety  320  is preferably a double safety, having a pivot  321 . A control arm  322  is provided for toggling the safety  320  between a safe position and a ready position. The control arm  322  can be justified for a left-handed shooter and for a right-handed shooter. A first lug is provided for engaging the safety ear of the transfer bar  310 . A second lug is also provided for engaging safety ear of the sear  260 . With the safety  320  in the safe position, lug prevents the transfer bar from rotating (hence maintaining engagement between the sear engager of the transfer bar and the sear contact of the sear), and the second lug directly prevents the sear  260  from dropping. When the firearm is in the set position, the trigger assembly can be uncocked by placing the safety to the safe position. In this regard, the first lug presses against ear of the bar  310  to rotate bar  310  about pivot away from the set position. Two detents and are provided. A ball is further provided. The ball engages detent when the trigger assembly is not in the safety on position, and engages detent when the trigger assembly is in the safety on position. The control arm  322  is used to effect the toggling between the detents, wherein the force component is temporarily compressed to allow the ball to move between the detents. 
     In this preferred embodiment, the force components may be comprised of pairs of magnets that are oriented in repulsion. In this regard, a series of magnets are preferably provided for maintaining the arrangement of the components and returning the trigger to the ready position. The magnets can be made of NeFeB, or any other suitable magnetic material. 
     One magnet  330  is received within the pocket  266  of the sear  260 , and a second magnet  331  is received within the pocket of the first spacer block  240 . Magnets  330  and  331  are oriented in repulsion so that there exists a repulsive force between the sear and the first spacer block. 
     A magnet  332  is received within the pocket  300  of the trigger  280 , and a second magnet  333  is received within the pocket  316  of the transfer bar  310 . Magnets  332  and  333  are oriented in repulsion so that there exists a repulsive force between the trigger and the bottom of the transfer bar. 
     Two magnets  335  and  336  are received within the pocket  52  of spacer block. The magnets are in repulsion, wherein a ball is biased upwards to engage one of the detents of the safety to maintain the safety in the desired position. 
     It is appreciated that because of the orientation (linear) of the polarity (opposites attract and equals repulse) of the magnets, the magnets will perform similar in function to springs. Accordingly, the trigger pull weight can be adjusted by adjusting the magnets. 
     It is appreciated that the location and strength of the magnets may be selected in order to adjust the firing characteristics of the firearm. 
     Turning now to  FIGS. 8-11 , it is seen that a third preferred embodiment of a trigger assembly  410  is provided. The trigger assembly  410  can be a direct replacement for a standard assembly. The trigger assembly  410  has a frame  420 , a sear  430 , a trigger  440  and a sear transfer bar  450 . Each of these components is similar to and has similar subcomponents as the like-named parts above. Specifically, the trigger  440  has a finger element  441  with a front  442  and a back. The user engages the front  442  of the finger element  441  while pulling the trigger  440 . 
     The trigger assembly  410  further has a safety  460 . Safety  460  is preferably a double safety, and accordingly engages at least two internal components (the sear  430  and the sear transfer bar  450 ) of the trigger assembly. 
     The safety  460  has a pivot  461 . The pivot  461  can comprise a pin or shaft, about which the safety  460  rotates. A control arm  465  is provided for toggling the safety  460  between a safe position and a ready position. The control arm  465  has an end with an end knob  466 . The end knob  466  can be screwed onto the end of the control arm  465  and be selectably positionable in front of the front  442  of the finger element  441  of the trigger  440 . The knob  466  can be affixed to the control arm  465  after the control arm is fed through the frame  420 . The control arm  465  can be justified for a left-handed shooter and for a right-handed shooter. An end key  467  is provided for accomplishing this, as described below. The key  467  preferably is formed from a generally right angle bend in the stock material, wherein the key  467  is generally perpendicular to the remainder of the arm  465  as best seen in  FIG. 11 . 
     The safety further has a rotating body  470 . The body has a slot  471  there through for receiving the key  467 . The key  467  can engage the slot  471  from either direction depending upon whether the safety  460  is developed for left or right orientation. 
     A first lug  472  is provided on the body  470  for engaging the safety ear of the transfer bar  450 . A second lug  473  is also provided for engaging safety ear of the sear  430 . With the safety  460  in the safe position, lug  472  prevents the transfer bar from rotating (hence maintaining engagement between the sear engager of the transfer bar  450  and the sear contact of the sear  430 ), and lug  473  directly prevents the sear  430  from dropping. When the firearm is in the set position, the trigger assembly can be uncocked by placing the safety to the safe position. In this regard, lug  472  presses against ear of the bar  450  to rotate bar  450  about pivot away from the set position. 
     Two detents  474  and  475  are provided. A safety ball  480 , or simply a ball, is further provided. The ball  480  rests on a spring  481  that is within pocket in the spacer block. The ball engages detent  475  when the trigger assembly is not in the safety on position, and engages detent  474  when the trigger assembly is in the safety on position. The control arm  465  is used to effect the toggling between the detents  474  and  475 , wherein spring  481  is temporarily compressed to allow the ball to move between the detents. The control arm  465  can have a first position adjacent to and in front of the front  442  of the finger element  441 . In this regard, the control arm  465  of the safety interferes with operation of the trigger in addition to ball  480  engaging the first detent  474 . The control arm has a second position rotated away from the front of the finger element of the trigger wherein it does not interfere with the engagement of the trigger in addition to the ball  480  engaging the second detent  475 . 
     It is appreciated that the control arm  465  can be positioned selectably for left and right handed configurations. 
     Thus it is apparent that there has been provided, in accordance with the invention, a trigger assembly that fully satisfies the objects, aims and advantages as set forth above. While the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations as fall within the spirit and broad scope of the appended claims.