US 12,169,105 B1
Firearm semiautomatic trigger mechanism
Nicholas George Barry, Albuquerque, NM (US)
Assigned to ABC IP, LLC, Dover, DE (US)
Filed by ABC IP, LLC, Dover, DE (US)
Filed on Jul. 1, 2024, as Appl. No. 18/760,089.
Claims priority of provisional application 63/523,934, filed on Jun. 29, 2023.
Int. Cl. F41A 19/10 (2006.01); F41A 19/14 (2006.01)
CPC F41A 19/10 (2013.01) [F41A 19/14 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A firearm trigger mechanism, comprising
a hammer having a sear catch and a disconnector-engaging catch, the hammer pivoting on a transverse hammer pivot axis between set and released positions, and the hammer adapted to be pivoted rearward by rearward movement of a bolt carrier;
a trigger member having a sear and pivoting on a transverse trigger member pivot axis between set and released positions, the trigger member having a surface positioned to be contacted by the hammer during rearward pivoting of the hammer to cause the trigger member to be forced to the set position, such that the trigger member sear and hammer sear catch are in engagement in the set positions of the hammer and trigger member and are out of engagement in the released positions of the hammer and trigger member;
a disconnector having a hook for engaging the disconnector-engaging catch of the hammer and adapted to be movably mounted on the trigger member;
an ejector having the form of a crank arm with rearward and forward arms and a pivot axis, rearward movement of the bolt carrier contacting the rearward arm, causing the forward arm to be lifted into the path of a cartridge casing being extracted from a barrel chamber;
a locking member adapted to move between a first position at which the locking member mechanically blocks the trigger member from moving to the released position and a second position at which the locking member does not mechanically block the trigger member allowing the trigger member to be moved to the released position, the locking member being spring biased toward the first position and adapted to be moved against the spring bias to the second position by contact from the ejector lever during forward movement of the bolt carrier as the bolt carrier reaches a substantially in-battery position;
a safety selector adapted to move between three positions defining safe, standard semi-automatic, and forced reset semi-automatic modes;
wherein, in the standard semi-automatic mode, rearward movement of the bolt carrier causes rearward pivoting of the hammer such that the disconnector hook catches the hammer hook, at which time a user must manually reduce pressure on the trigger member so that the trigger spring moves the trigger member to free the hammer from the disconnector, permitting the trigger member to pivot to the set position so that the sear engages the hammer sear notch, and thereafter, the user can pull the trigger member functioning it to fire the firearm again;
wherein in the forced reset semi-automatic mode, rearward movement of the bolt carrier causes rearward pivoting of the hammer causing the trigger member to be forced to the set position and prevents the disconnector hook from catching the disconnector-engaging catch of the hammer, instead the trigger being forced to the reset position where its sear catches the sear catch of the hammer; and
wherein as the bolt carrier reciprocates to the rear and the forward arm of the ejector is lifted, the locking member is spring biased toward the first position, and as the bolt carrier returns forward, the forward arm of the ejector is depressed, which in turn moves the locking member to the second position in which it does not block the trigger member from being functioned by an external force away from the set position and when the bolt carrier reaches the substantially in-battery position, the user can pull the trigger member again to fire a subsequent round.