US20150153125A1 - Adjustable modular trigger assembly for firearms - Google Patents
Adjustable modular trigger assembly for firearms Download PDFInfo
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- US20150153125A1 US20150153125A1 US14/096,645 US201314096645A US2015153125A1 US 20150153125 A1 US20150153125 A1 US 20150153125A1 US 201314096645 A US201314096645 A US 201314096645A US 2015153125 A1 US2015153125 A1 US 2015153125A1
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- Prior art keywords
- trigger
- modular
- housing
- hammer
- sear
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A17/00—Safety arrangements, e.g. safeties
- F41A17/46—Trigger safeties, i.e. means for preventing trigger movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A17/00—Safety arrangements, e.g. safeties
- F41A17/74—Hammer safeties, i.e. means for preventing the hammer from hitting the cartridge or the firing pin
- F41A17/82—Hammer safeties, i.e. means for preventing the hammer from hitting the cartridge or the firing pin trigger-operated, i.e. the movement of the trigger bringing a hammer safety into inoperative position during firing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
- F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
- F41A19/10—Triggers; Trigger mountings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
- F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
- F41A19/14—Hammers, i.e. pivotably-mounted striker elements; Hammer mountings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
- F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
- F41A19/15—Modular firing mechanism units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
- F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
- F41A19/16—Adjustable firing mechanisms; Trigger mechanisms with adjustable trigger pull
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
- F41A19/06—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms
- F41A19/42—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer
- F41A19/43—Mechanical firing mechanisms, e.g. counterrecoil firing, recoil actuated firing mechanisms having at least one hammer in bolt-action guns
- F41A19/44—Sear arrangements therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
Definitions
- This invention relates generally to firearms. More specifically, it relates to adjustable trigger assemblies for firearms.
- Trigger assemblies in firearms are often adjusted for both hunting and competitive shooting.
- Lighter trigger pulls i.e., trigger pull forces for discharges
- Shooters often want to adjust the trigger force to their own preference, depending upon their particular application.
- the preferred embodiment also includes: a trigger force adjustment means for adjusting the trigger pull; and a sear screw adjuster means for the manufacturer to preset the trigger pull. Both adjusters are self-contained within the housing, something not found in the prior art.
- the shooter pulls back on both the first and second triggers. Initially, the second trigger rotates and nestles into the first trigger's slot, until the front faces of the blades for both triggers are flush. Continued pulling trips the sear off a hammer's notch to enable the hammer to fall and discharge the weapon, without the hooked extensions interfering.
- the hammer may start to rotate, whereupon the second trigger's hooked extension is designed to catch the hooked hammer's extension inside the modular housing.
- the firearm's trigger components subsequently must be reset to allow for a subsequent trigger pull.
- FIG. 1 is an exploded view of Applicants' preferred adjustable modular trigger assembly adjacent a lower receiver, of a semiautomatic rifle, into which the assembly can be mounted;
- FIG. 2 illustrates a perspective view of the assembled modular trigger assembly not mounted within the lower receiver
- FIG. 3 is a top plan view of the assembled modular trigger assembly not mounted within the lower receiver
- FIG. 4A is a cross-sectional view, taken along sight line 4 A- 4 C of FIG. 3 , showing the adjustable modular trigger assembly is in an “at rest” condition;
- FIG. 4B is a cross-sectional view, taken along sight line 4 A- 4 C, showing the adjustable modular trigger assembly of FIG. 4A after being at rest and an unintentional rotation of a first trigger;
- FIG. 4C is a cross-sectional view, taken along sight line 4 A- 4 C, showing the adjustable modular trigger assembly of FIG. 4A after being at rest and an intentional full rotation of both triggers;
- FIG. 5A is a side plan view of a modular trigger housing shown in FIG. 1 ;
- FIG. 5B is a opposite side plan view of the modular trigger housing
- FIGS. 6A , 6 B are enlarged perspective views of two identical pivot bushings shown in FIG. 1 ;
- FIG. 7 is a side view of the assembled modular trigger assembly of FIG. 2 , with portions broken away to show an adjustable trigger force means;
- FIG. 9 is a perspective view of a semiautomatic firearm.
- FIGS. 1 , 2 , 3 , 4 A, 4 B, 4 C, 5 A, 5 B, 6 A, 6 B, 7 , 8 A and 8 B illustrate Applicants' preferred embodiment of an adjustable modular trigger assembly, generally designated by reference numeral 100 , for a long gun, such as a semiautomatic rifle (e.g., the depicted AR-15 style semiautomatic rifle 101 in FIG. 9 ) or shotgun (not shown).
- Applicants' preferred assembly 100 comprises a modular trigger housing 102 designed to be removably mounted between the sidewalls 104 a, 104 b of a lower receiver 106 of the long gun by modular pins (e.g., standard trigger and hammer pins 108 , 110 ).
- the depicted receiver 106 is from the AR-15 style semiautomatic rifle 101 .
- the modular trigger assembly 100 has two major unique features: a trigger force adjustment means 112 (see FIGS. 1 , 7 ) in the modular housing 102 , for adjusting the trigger pull; and a safety means 114 (see FIG. 4B ) for avoiding premature or inadvertent discharge of the firearm.
- Applicants' module housing 102 includes two non-coaxial pivot bushings 116 a, 116 B (see FIGS. 6A , 6 B), through which the hammer and trigger pins 108 , 110 respectively extend, when the housing is mounted within the receiver 106 .
- Each pivot bushing 116 a, 116 b extends between opposed, spaced apart, sidewalls 118 a, 118 b of the housing 102 .
- Each bushing is supported at end portions within respective pair of aligned throughbores ( 120 a, 120 b and 122 a, 122 b ) in the housing sidewalls 118 a, 118 b.
- Pivot bushings 116 a, 116 b are identical. They are tubular with throughbores 124 a, 124 b extending longitudinally through the bushings. Each throughbore 124 a, 124 b exits both ends of a pivot bushing.
- pivot bushings 116 a, 116 b are preferably circular in cross-section, except their ends, which are set back to provide shoulders (see 126 a, 126 b and 128 a, 128 b in FIGS. 6A , 6 B).
- Two hammer and trigger pin retainers 130 a, 130 b (see FIG. 1 ), located on the outside of housing sidewalls 118 a, 118 b, act as spring clips against the shoulders to hold the bushings 116 a, 116 b in place.
- the hammer and trigger pin retainers 130 a, 130 b prevent rotation of the bushings.
- the retainers 130 a, 130 b also engage radial grooves ( 131 a and 131 b; 131 c and 131 d ) in the trigger pin 108 and hammer pin 110 to prevent those pins from moving axially.
- Retainers 130 a, 130 b are generally each shaped like a squared upside-down “U”.
- the tops of the retainers are indented (e.g., at 132 ). Those indents slip over protrusions 134 a, 134 b atop the housing sidewalls 118 a, 118 b (see FIGS. 1 , 3 , 5 A, 5 B).
- the modular housing 102 is mounted in receiver 106 by: (a) inserting the hammer pin 110 into a hammer hole (e.g., 136 a ) of the receiver sidewall 104 a, then pushing the hammer pin 110 through the throughbore 124 b of pivot bushing 116 b, and into an aligned hammer hole (not shown) in receiver sidewall 104 b , until both ends of the hammer pin 110 (which extend beyond the pivot bushing 116 b ) are supported by the receiver sidewalls 104 a, 104 b; and (b) similarly inserting the trigger pin 108 into a trigger hole (e.g., 138 a ) of the receiver sidewall 104 a, then pushing the trigger pin 108 through the throughbore 124 a of pivot bushing 116 a, and into an aligned trigger hole (not shown) in the receiver sidewall 104 b, until both ends of the trigger pin 108
- Applicants' modular trigger assembly contains attachment means for removably mounting the modular assembly within a lower receiver (e.g., 106 ) of a long gun. That attachment means comprises: the pivot bushings 116 a, 116 b with their throughbores 124 a, 124 b; and the open holes ( 120 a, 120 b and 122 a, 122 b ) in the housing sidewalls 118 a, 118 b.
- Applicants' preferred modular housing 102 house Applicants' trigger components, which are different than in U.S. Pat. No. 7,293,385.
- Applicants' preferred trigger components include: (a) a primary or first trigger 140 rotatably mounted on pivot bushing 116 a within the housing 102 (i.e., between the housing sidewalls 118 a, 118 b ), whereby the primary trigger 140 can pivot about that bushing 116 a (which remains still) and (when the module housing 102 is mounted in the receiver 106 ) the trigger pin 108 as well; the primary trigger 140 has an elongated central slot or throughbore 142 , including in its trigger blade 144 ; (b) a second or secondary trigger 146 rotatably mounted within the elongated central slot 142 by a trigger blade pin 148 mounted in the primary trigger 140 , whereby a trigger blade 150 of the secondary trigger 146 can pivot about the trigger blade pin 148 ; and (c) a hammer 152 , also rotatably mounted
- Hammer 152 has a sear notch 154 .
- a pivotable sear 156 is designed to catch the hammer's sear notch after the trigger components have been recocked/reset.
- Tension from a disconnector spring 158 biases the sear 156 toward and against the hammer notch 154 (see FIG. 4A ).
- trigger assembly components in the modular housing 102 include: a disconnector 160 ; a disconnector pin 162 ; a trigger return spring 164 ; a trigger blade spring 166 ; and a hammer spring 168 .
- the safety means 114 for avoiding premature or inadvertent discharge of the firearm comprises: the second trigger 146 , which includes a hooked protrusion 170 inside the housing 102 ; and an adjacent, oppositely facing, hooked protrusion 172 emanating from underneath the hammer 152 .
- the sear 156 pivots out of the hammer's sear notch 154 , causing the hammer 152 to start to rotate.
- the hooked protrusions 170 , 172 engage or interlock (see FIG. 4B ) to prevent the hammer 152 from fully rotating to strike a standard firing pin (not shown). This interlock prevents the firearm from accidentally discharging.
- the shooter has to recock/reset the trigger components, after such an interlock, to an “at rest” position (see FIG. 4A ) before the firearm can be fired.
- the first trigger 140 is returned to its “at rest” position by an independent trigger return spring 164 (see FIG. 1 ) whenever an external force is removed (e.g., finger pressure).
- the above-described interlock also avoids an unexpected discharge if the blade 150 of the second trigger 146 is depressed (slightly or fully) after an unintentional partial rotation of the blade 144 of the primary trigger 146 , as the movement of the primary trigger blade 144 already caused the hooked protrusions 170 , 172 to engage.
- the exposed blade 150 of the second trigger 146 is depressed by the shooter's trigger finger (not shown) until that blade 150 is flush with the face of the primary trigger 140 (see FIG. 4C ). At that point, the second trigger blade 150 has nestled within the elongated slot 142 in the first trigger blade 144 .
- Increasing finger pressure upon the triggers 140 , 146 causes both triggers to rotate. As they rotate, the sear 156 pivots out of the hammer's sear notch 154 (see FIGS. 4A , 4 C), allowing the hammer 152 to fully rotate without the hooked protrusions 170 , 172 interfering.
- FIG. 4A shows the pivotable disconnector 160 against the first trigger 140 .
- the first trigger 140 pushes the disconnector 160 upwards, which causes the sear 156 to rotate out of the hammer's sear notch 154 . That allows the hammer 152 to fall.
- the modular housing 102 houses the trigger force adjustment means 112 for adjusting the force required for a primary trigger pull.
- That trigger adjustment means comprises: a trigger force adjustment screw 174 (i.e., a set screw); and a trigger force adjustment spring 176 housed in a throughbore 178 of the housing 102 .
- the trigger force adjustment screw 174 By turning the set screw 174 , either clockwise or counterclockwise, the compression of associated spring 176 can be modified to adjust the trigger pull (i.e., the force required by a shooter to pull the trigger). Turning the screw 174 clockwise increases the spring tension. Conversely, the screw 174 is rotated out to decrease the spring tension.
- FIGS. 1 , 4 A, 4 B, 4 C best shows a sear adjustment means 180 of Applicants' preferred modular trigger assembly 100 .
- the sear adjustment means 180 comprises: a sear adjustment screw 182 ; a sear spring 184 ; and a sear follower 186 . Those parts are housed in another throughbore 188 of the housing 102 .
- the compression of associated sear spring 184 can be modified to adjust the force exerted by the sear follower 186 upon the pivotable sear 156 .
- Turning the screw 182 clockwise increases the spring tension, which presses the sear 156 tighter against the hammer's sear notch 154 . That makes it harder for the sear 156 to pivot away from sear notch 154 , upon the primary trigger 140 (or hammer 152 ) being jostled.
- the sear adjustment screw 182 is rotated out to decrease the spring tension.
- the preferred sear adjustment means 180 is designed for use by the manufacturer only. By turning the sear adjustment screw 182 , the manufacturer: can account for slight variances (tolerances) in the size and shape of the different sear(s) 156 and hammer(s) 152 after manufacturing; and can ensure the same trigger pull for different modular trigger assembly units before they leave the manufacturer.
- Mossberg turns the sear adjustment screw 182 to set the trigger pull for each unit at 2.5 pounds for each unit. After adjusting the sear adjustment screw 182 , Mossberg covers it with a sealant (preferably epoxy) to prevent customer adjustment.
- a sealant preferably epoxy
- Applicants' safety means 114 ensures the second trigger will prevent the firearm from discharging even when that trigger bounces or rotates slightly when the firearm is subjected to jarring (e.g., firearm is dropped on a hard surface).
- the second trigger 146 is balanced about its pivot axis. This, coupled with its small mass and the forward bias of trigger blade spring 166 , minimizes rotation. Timing does not impact the tendency of the secondary trigger to rotate when the gun is jarred.
- Applicants' trigger assembly 100 may not be able to prevent all types of unintended or accidental discharges. For example, a heavy unbalanced force applied to the firearm or trigger(s) might override the interlock created by the hooked protrusions 170 , 172 ; or, if both blades of triggers 140 , 146 are jostled together (e.g., a tree branch snags both), that might result in a discharge as though the triggers were intentionally pulled.
- Applicants' depicted modular adjustable trigger assembly 100 is designed to be installed in a standard lower receiver of an AR-style semiautomatic rifle (e.g., AR-15 or AR-10) using the existing hammer/and trigger pins 110 , 108 and safety (not shown).
- the adjustable trigger assembly for example, can use the standard AR-15 safety to prevent the trigger (here, double triggers 140 , 146 ) from disengaging the hammer 152 when the AR-15's standard safety is in the “safe” position.
- Applicants' invention can be thought of, in its broadest sense, as a method of avoiding a premature discharge of a long gun comprising:
- Applicants' preferred method can include the following step:
- adjustable trigger assembly 100 could be adapted for use in shotguns.
Abstract
Description
- This invention relates generally to firearms. More specifically, it relates to adjustable trigger assemblies for firearms.
- Trigger assemblies in firearms are often adjusted for both hunting and competitive shooting. Lighter trigger pulls (i.e., trigger pull forces for discharges) may be preferred for competition or hunting to ensure quicker or more accurate shots. Shooters often want to adjust the trigger force to their own preference, depending upon their particular application.
- Some long guns, such as rifles, have come equipped for years with set screws for trigger adjustment. Turning a set screw clockwise typically increases the compression of a coil spring, which rests against a trigger stem inside a receiver housing. That creates a heavier trigger pull. Letting up on the spring, by turning the screw counterclockwise, lightens the trigger pull.
- Sometimes, shooters make unauthorized and non-advisable modifications in order to lessen trigger pull force. Certain modifications can create very light trigger pull forces, but can also cause potential safety problems. Firearm manufacturers neither recommend nor sanction this approach.
- Many different types of adjustable trigger assemblies have been patented, such as: U.S. Pat. No. 2,249,232 to Smith; U.S. Pat. No. 4,667,429 to Perazzi; U.S. Pat. No. 4,671,005 to Jewell; U.S. Pat. No. 4,691,461 to Behlert; U.S. Pat. No. 4,908,970 to Bell; U.S. Pat. No. 5,012,604 to Rogers; U.S. Pat. No. 5,487,233 to Jewell; U.S. Pat. No. 6,131,324 to Jewell; U.S. Pat. No. 6,164,001 to Lee; U.S. Pat. No. 6,553,706 to Gancarz et al.; U.S. Pat. No. 6,978,568 to Jewell; U.S. Pat. No. 7,047,685 to Diaz et al.; U.S. Pat. No. 7,165,352 to Langlotz; U.S. Pat. No. 8,220,193 to Lynch; and U.S. Pat. No. 8,250,799 to Duperry et al. Several of these assemblies have many small interacting parts. Small parts are difficult to manufacture properly, which can lead to jamming or delayed functioning.
- Accordingly, it is a principal object of the present invention to provide an improved trigger assembly for firearms to avoid an unexpected (e.g., accidental or premature) firing after an unintentional trigger pull, where light trigger pulls have previously been set.
- It is another principal object to provide a related method for avoiding an unexpected discharge of a firearm after an unintentional or accidental trigger pull, where light trigger pulls have previously been set.
- It is another object to provide such an adjustable trigger assembly, commensurate with the above-listed objects, which can be part of a modular trigger assembly.
- It is a more specific object to provide such an adjustable trigger assembly which is durable to use.
- Applicants have disclosed a modular trigger assembly, and related method, for firearms such as shotguns and rifles. In the preferred embodiment, Applicants' adjustable trigger assembly comprises a modular trigger housing having: a modified standard trigger with a central elongated slot or throughbore; a second trigger pivotally mounted within the slot; a notch or shoulder, atop the first trigger, on which a sear rests during a cocked position of a hammer; and a safety means comprising two opposed hooked shaped extensions—one atop the second trigger and the other extending below a hammer—inside the firearm's housing, which interact to prevent the hammer from fully rotating after an unintentional rotation of the trigger. Both the first and second triggers are mounted on separate, non-coaxial pivot pins.
- The preferred embodiment also includes: a trigger force adjustment means for adjusting the trigger pull; and a sear screw adjuster means for the manufacturer to preset the trigger pull. Both adjusters are self-contained within the housing, something not found in the prior art.
- During a desired trigger pull, the shooter pulls back on both the first and second triggers. Initially, the second trigger rotates and nestles into the first trigger's slot, until the front faces of the blades for both triggers are flush. Continued pulling trips the sear off a hammer's notch to enable the hammer to fall and discharge the weapon, without the hooked extensions interfering.
- If instead the first trigger is jostled accidentally, the hammer may start to rotate, whereupon the second trigger's hooked extension is designed to catch the hooked hammer's extension inside the modular housing. The firearm's trigger components subsequently must be reset to allow for a subsequent trigger pull.
- Nothing is foolproof: for example, if the blades of both the first trigger and second trigger are jostled together, the firearm may discharge as though an intentional trigger pull has occurred.
- The above and other objects will become more readily apparent when the following description is read in conjunction with the accompanying drawings, in which:
-
FIG. 1 is an exploded view of Applicants' preferred adjustable modular trigger assembly adjacent a lower receiver, of a semiautomatic rifle, into which the assembly can be mounted; -
FIG. 2 illustrates a perspective view of the assembled modular trigger assembly not mounted within the lower receiver; -
FIG. 3 is a top plan view of the assembled modular trigger assembly not mounted within the lower receiver; -
FIG. 4A is a cross-sectional view, taken alongsight line 4A-4C ofFIG. 3 , showing the adjustable modular trigger assembly is in an “at rest” condition; -
FIG. 4B is a cross-sectional view, taken alongsight line 4A-4C, showing the adjustable modular trigger assembly ofFIG. 4A after being at rest and an unintentional rotation of a first trigger; -
FIG. 4C is a cross-sectional view, taken alongsight line 4A-4C, showing the adjustable modular trigger assembly ofFIG. 4A after being at rest and an intentional full rotation of both triggers; -
FIG. 5A is a side plan view of a modular trigger housing shown inFIG. 1 ; -
FIG. 5B is a opposite side plan view of the modular trigger housing; -
FIGS. 6A , 6B are enlarged perspective views of two identical pivot bushings shown inFIG. 1 ; -
FIG. 7 is a side view of the assembled modular trigger assembly ofFIG. 2 , with portions broken away to show an adjustable trigger force means; -
FIGS. 8A , 8B are enlarged perspective views of a hammer pin and a trigger pin shown inFIG. 1 ; and -
FIG. 9 is a perspective view of a semiautomatic firearm. -
FIGS. 1 , 2, 3, 4A, 4B, 4C, 5A, 5B, 6A, 6B, 7, 8A and 8B illustrate Applicants' preferred embodiment of an adjustable modular trigger assembly, generally designated byreference numeral 100, for a long gun, such as a semiautomatic rifle (e.g., the depicted AR-15 stylesemiautomatic rifle 101 inFIG. 9 ) or shotgun (not shown). Applicants'preferred assembly 100 comprises amodular trigger housing 102 designed to be removably mounted between thesidewalls lower receiver 106 of the long gun by modular pins (e.g., standard trigger and hammerpins 108, 110). Note that the depictedreceiver 106 is from the AR-15 stylesemiautomatic rifle 101. - In the preferred embodiment, the
modular trigger assembly 100 has two major unique features: a trigger force adjustment means 112 (seeFIGS. 1 , 7) in themodular housing 102, for adjusting the trigger pull; and a safety means 114 (seeFIG. 4B ) for avoiding premature or inadvertent discharge of the firearm. - This application relates generally to: U.S. Pat. No. 8,220,193 to Thomas Lynch for “Method and Apparatus for Adjustable Trigger Assemblies for Firearms” issued Jul. 17, 2012; and U.S. Pat. No. 7,293,385 to Michael McCormick for “Modular Trigger Group for Firearms and Firearm Having a Modular Trigger Group” issued Nov. 13, 2007. O.F. Mossberg & Sons, Inc. (“Mossberg”) is the Assignee of those patents and the current application.
- Like U.S. Pat. No. 7,293,385 (though it uses different language), Applicants'
module housing 102 includes twonon-coaxial pivot bushings 116 a, 116B (seeFIGS. 6A , 6B), through which the hammer and triggerpins receiver 106. Each pivot bushing 116 a, 116 b extends between opposed, spaced apart,sidewalls housing 102. Each bushing is supported at end portions within respective pair of aligned throughbores (120 a, 120 b and 122 a, 122 b) in thehousing sidewalls -
Pivot bushings throughbores - Applicants'
pivot bushings FIGS. 6A , 6B). Two hammer and triggerpin retainers FIG. 1 ), located on the outside ofhousing sidewalls bushings pin retainers retainers trigger pin 108 andhammer pin 110 to prevent those pins from moving axially. -
Retainers protrusions housing sidewalls FIGS. 1 , 3, 5A, 5B). - As with U.S. Pat. No. 7,293,385, the
modular housing 102 is mounted inreceiver 106 by: (a) inserting thehammer pin 110 into a hammer hole (e.g., 136 a) of thereceiver sidewall 104 a, then pushing thehammer pin 110 through thethroughbore 124 b ofpivot bushing 116 b, and into an aligned hammer hole (not shown) inreceiver sidewall 104 b, until both ends of the hammer pin 110 (which extend beyond thepivot bushing 116 b) are supported by the receiver sidewalls 104 a, 104 b; and (b) similarly inserting thetrigger pin 108 into a trigger hole (e.g., 138 a) of thereceiver sidewall 104 a, then pushing thetrigger pin 108 through the throughbore 124 a of pivot bushing 116 a, and into an aligned trigger hole (not shown) in thereceiver sidewall 104 b, until both ends of the trigger pin 108 (which stick out beyond thepivot bushing 116 b) are supported by the receiver sidewalls 104 a, 104 b. - In other words, Applicants' modular trigger assembly contains attachment means for removably mounting the modular assembly within a lower receiver (e.g., 106) of a long gun. That attachment means comprises: the
pivot bushings throughbores housing sidewalls - Applicants' preferred
modular housing 102 house Applicants' trigger components, which are different than in U.S. Pat. No. 7,293,385. Applicants' preferred trigger components include: (a) a primary orfirst trigger 140 rotatably mounted on pivot bushing 116 a within the housing 102 (i.e., between thehousing sidewalls primary trigger 140 can pivot about thatbushing 116 a (which remains still) and (when themodule housing 102 is mounted in the receiver 106) thetrigger pin 108 as well; theprimary trigger 140 has an elongated central slot orthroughbore 142, including in itstrigger blade 144; (b) a second orsecondary trigger 146 rotatably mounted within the elongatedcentral slot 142 by atrigger blade pin 148 mounted in theprimary trigger 140, whereby atrigger blade 150 of thesecondary trigger 146 can pivot about thetrigger blade pin 148; and (c) ahammer 152, also rotatably mounted onpivot bushing 116 b (which remains still) within the housing 102 (between thehousing sidewalls hammer 152 can pivot about thatbushing 116 b and (if thehousing 102 is mounted in the receiver 106) the receiver'shammer pin 110 as well. -
Hammer 152 has asear notch 154. Apivotable sear 156 is designed to catch the hammer's sear notch after the trigger components have been recocked/reset. Tension from adisconnector spring 158 biases the sear 156 toward and against the hammer notch 154 (seeFIG. 4A ). - As best shown in
FIG. 1 , other trigger assembly components in themodular housing 102 include: adisconnector 160; adisconnector pin 162; atrigger return spring 164; atrigger blade spring 166; and ahammer spring 168. - The safety means 114 for avoiding premature or inadvertent discharge of the firearm comprises: the
second trigger 146, which includes ahooked protrusion 170 inside thehousing 102; and an adjacent, oppositely facing,hooked protrusion 172 emanating from underneath thehammer 152. - In the case of an unintentional rotation of the
first trigger 140, the sear 156 pivots out of the hammer'ssear notch 154, causing thehammer 152 to start to rotate. The hookedprotrusions FIG. 4B ) to prevent thehammer 152 from fully rotating to strike a standard firing pin (not shown). This interlock prevents the firearm from accidentally discharging. - The shooter has to recock/reset the trigger components, after such an interlock, to an “at rest” position (see
FIG. 4A ) before the firearm can be fired. As in standard trigger assemblies, thefirst trigger 140 is returned to its “at rest” position by an independent trigger return spring 164 (seeFIG. 1 ) whenever an external force is removed (e.g., finger pressure). - The above-described interlock also avoids an unexpected discharge if the
blade 150 of thesecond trigger 146 is depressed (slightly or fully) after an unintentional partial rotation of theblade 144 of theprimary trigger 146, as the movement of theprimary trigger blade 144 already caused the hookedprotrusions - During a normal, intentional trigger pull by a shooter, the exposed
blade 150 of thesecond trigger 146 is depressed by the shooter's trigger finger (not shown) until thatblade 150 is flush with the face of the primary trigger 140 (seeFIG. 4C ). At that point, thesecond trigger blade 150 has nestled within theelongated slot 142 in thefirst trigger blade 144. Increasing finger pressure upon thetriggers FIGS. 4A , 4C), allowing thehammer 152 to fully rotate without the hookedprotrusions -
FIG. 4A shows thepivotable disconnector 160 against thefirst trigger 140. During the joint trigger rotation, thefirst trigger 140 pushes thedisconnector 160 upwards, which causes the sear 156 to rotate out of the hammer'ssear notch 154. That allows thehammer 152 to fall. - As best shown in
FIGS. 1 and 7 , themodular housing 102 houses the trigger force adjustment means 112 for adjusting the force required for a primary trigger pull. That trigger adjustment means comprises: a trigger force adjustment screw 174 (i.e., a set screw); and a triggerforce adjustment spring 176 housed in athroughbore 178 of thehousing 102. By turning theset screw 174, either clockwise or counterclockwise, the compression of associatedspring 176 can be modified to adjust the trigger pull (i.e., the force required by a shooter to pull the trigger). Turning thescrew 174 clockwise increases the spring tension. Conversely, thescrew 174 is rotated out to decrease the spring tension. -
FIGS. 1 , 4A, 4B, 4C best shows a sear adjustment means 180 of Applicants' preferredmodular trigger assembly 100. The sear adjustment means 180 comprises: asear adjustment screw 182; asear spring 184; and asear follower 186. Those parts are housed in anotherthroughbore 188 of thehousing 102. - By turning the
sear adjustment screw 182, either clockwise or counterclockwise, the compression of associatedsear spring 184 can be modified to adjust the force exerted by thesear follower 186 upon thepivotable sear 156. Turning thescrew 182 clockwise increases the spring tension, which presses the sear 156 tighter against the hammer'ssear notch 154. That makes it harder for the sear 156 to pivot away fromsear notch 154, upon the primary trigger 140 (or hammer 152) being jostled. Conversely, thesear adjustment screw 182 is rotated out to decrease the spring tension. - The preferred sear adjustment means 180 is designed for use by the manufacturer only. By turning the
sear adjustment screw 182, the manufacturer: can account for slight variances (tolerances) in the size and shape of the different sear(s) 156 and hammer(s) 152 after manufacturing; and can ensure the same trigger pull for different modular trigger assembly units before they leave the manufacturer. - For example, Mossberg turns the
sear adjustment screw 182 to set the trigger pull for each unit at 2.5 pounds for each unit. After adjusting thesear adjustment screw 182, Mossberg covers it with a sealant (preferably epoxy) to prevent customer adjustment. - Applicants' safety means 114 ensures the second trigger will prevent the firearm from discharging even when that trigger bounces or rotates slightly when the firearm is subjected to jarring (e.g., firearm is dropped on a hard surface).
- The
second trigger 146 is balanced about its pivot axis. This, coupled with its small mass and the forward bias oftrigger blade spring 166, minimizes rotation. Timing does not impact the tendency of the secondary trigger to rotate when the gun is jarred. - Shooters often set their trigger assemblies for a light trigger pull. This invention is designed to avoid premature or unintended discharge at light trigger pull settings. Applicants' slotted
trigger 140, pivotablesecond trigger blade 150, and hookedprotrusions - It should be noted that Applicants'
trigger assembly 100 may not be able to prevent all types of unintended or accidental discharges. For example, a heavy unbalanced force applied to the firearm or trigger(s) might override the interlock created by the hookedprotrusions triggers - Applicants' depicted modular
adjustable trigger assembly 100 is designed to be installed in a standard lower receiver of an AR-style semiautomatic rifle (e.g., AR-15 or AR-10) using the existing hammer/and triggerpins double triggers 140, 146) from disengaging thehammer 152 when the AR-15's standard safety is in the “safe” position. - Applicants' invention can be thought of, in its broadest sense, as a method of avoiding a premature discharge of a long gun comprising:
- a. mounting a modular trigger assembly between the sidewalls of a receiver by passing hammer and trigger pins through pivot bushings extending through a modular trigger housing of the assembly and by supporting ends of the hammer and trigger pins, which extend beyond the modular trigger assembly, within holes in the sidewalls of the receiver;
-
- i. wherein the modular trigger assembly includes a plurality of trigger components, rotatably mounted on the pivot bushings between sidewalls of the housing, including: a hammer; a disconnector; a first trigger and a second trigger pivotable within an elongated slot of the first trigger; and
- ii. whereby the hammer, first trigger and second trigger can rotate about and relative to the pivot bushings, which are stationary within the modular trigger assembly;
- b. avoiding an unexpected discharge of the long gun, upon an unintentional partial rotation of the first trigger, by engaging a hooked protrusion of an extension of the second trigger with a hooked protrusion of the hammer to prevent the hammer from rotating further and striking a firing pin.
- Applicants' preferred method can include the following step:
- a. adjusting the trigger pull for the first trigger by turning a trigger force adjustment screw contained in the modular housing.
- It should be understood by those skilled in making firearms that obvious structural modifications can be made to the depicted embodiment without departing from the spirit of the invention. For example, the
adjustable trigger assembly 100 could be adapted for use in shotguns.
Claims (14)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/096,645 US9046313B1 (en) | 2013-12-04 | 2013-12-04 | Adjustable modular trigger assembly for firearms |
EP14771997.5A EP3077758A1 (en) | 2013-12-04 | 2014-09-02 | Adjustable modular trigger assembly for firearms |
PCT/US2014/053664 WO2015084445A1 (en) | 2013-12-04 | 2014-09-02 | Adjustable modular trigger assembly for firearms |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/096,645 US9046313B1 (en) | 2013-12-04 | 2013-12-04 | Adjustable modular trigger assembly for firearms |
Publications (2)
Publication Number | Publication Date |
---|---|
US9046313B1 US9046313B1 (en) | 2015-06-02 |
US20150153125A1 true US20150153125A1 (en) | 2015-06-04 |
Family
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Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/096,645 Expired - Fee Related US9046313B1 (en) | 2013-12-04 | 2013-12-04 | Adjustable modular trigger assembly for firearms |
Country Status (3)
Country | Link |
---|---|
US (1) | US9046313B1 (en) |
EP (1) | EP3077758A1 (en) |
WO (1) | WO2015084445A1 (en) |
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US20160131449A1 (en) * | 2013-12-06 | 2016-05-12 | Robert Adam Horch | Fire control with multiple user-selectable trigger profiles |
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USD765211S1 (en) * | 2014-06-19 | 2016-08-30 | George Huang | Lower receiver for a firearm |
USD746936S1 (en) * | 2014-06-19 | 2016-01-05 | George Huang | Lightweight lower receiver |
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USD835743S1 (en) * | 2014-10-22 | 2018-12-11 | In Ovation, LLC | Firearm trigger |
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USD815711S1 (en) * | 2017-02-02 | 2018-04-17 | Benjamin Rather Holm | AR-15 magazine release lock |
US11162751B2 (en) * | 2017-02-08 | 2021-11-02 | Black Site, Inc. | Method and apparatus for providing a grip module able to house a firing control unit |
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US10488134B2 (en) * | 2018-02-20 | 2019-11-26 | Krl Holding Company, Inc. | Two-stage, drop-in trigger assembly |
US10837728B2 (en) * | 2018-02-20 | 2020-11-17 | Krl Holding Company, Inc. | Two-stage, drop-in trigger assembly |
US11566862B2 (en) | 2018-02-20 | 2023-01-31 | Lewis Machine & Tool Co. | Two-stage, drop-in trigger assembly |
US20220011068A1 (en) * | 2019-05-29 | 2022-01-13 | Smith & Wesson Inc. | Firearm Fire Control Mechanisms |
US11965705B2 (en) * | 2019-05-29 | 2024-04-23 | Smith & Wesson Inc. | Firearm fire control mechanisms |
CZ308651B6 (en) * | 2019-12-06 | 2021-01-27 | Česká Zbrojovka A.S. | Trigger resistance adjustment mechanism |
US20230228511A1 (en) * | 2019-12-17 | 2023-07-20 | Glock Technology Gmbh | Trigger for a firearm and a firearm equipped therewith |
US11971233B2 (en) * | 2019-12-17 | 2024-04-30 | Glock Technology Gmbh | Trigger for a firearm and a firearm equipped therewith |
US11187482B2 (en) | 2020-03-31 | 2021-11-30 | Pressure Break, Llc | Trigger assembly |
US11530891B2 (en) | 2020-10-05 | 2022-12-20 | Cobalt Kinetics | Reverse baffle compensator |
WO2023172570A1 (en) * | 2022-03-07 | 2023-09-14 | Q, Llc | Dynamically balanced trigger system |
Also Published As
Publication number | Publication date |
---|---|
US9046313B1 (en) | 2015-06-02 |
WO2015084445A1 (en) | 2015-06-11 |
EP3077758A1 (en) | 2016-10-12 |
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