US12636403 - Firearm trigger mechanism

The patent describes a trigger mechanism for AR-pattern firearms that includes a hammer, trigger member, disconnector, locking member, and a three-position safety selector. This mechanism allows for both standard semi-automatic and forced reset semi-automatic firing modes, with the locking member preventing trigger movement until the bolt carrier reaches a specific position.

Claim 1

1 . A trigger mechanism for a firearm comprising: a hammer having a hammer sear surface and a hammer hook and adapted to be mounted in a fire control mechanism pocket of a receiver to pivot on a transverse hammer pivot axis between set and released positions, the hammer adapted to be pivoted rearward by rearward movement of a bolt means; a trigger member having a trigger member sear surface and adapted to be mounted in the fire control mechanism pocket to move between a set position and a released position, rearward pivoting of the hammer causing the trigger member to be forced to the set position; wherein the hammer sear surface and trigger member sear surface are in engagement in the set position of the hammer and the set position of the trigger member and are out of engagement in the released position of the hammer and the released position of the trigger member; a disconnector having a disconnector hook for engaging the hammer hook and adapted to be mounted in the fire control mechanism pocket to pivot on a transverse disconnector pivot axis a locking member adapted to be movably mounted in the fire control mechanism pocket, the locking member being movable 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 and adapted to be moved to the second position by forward movement of the bolt; and a safety selector adapted to be movably mounted in the fire control mechanism pocket to move between at least a safe position, a standard semi-automatic position, and a forced reset-semi-automatic position; wherein in the standard semi-automatic position, rearward movement of the bolt means causes rearward pivoting of the hammer such that the disconnector hook catches the hammer hook, at which time a user must manually release pressure on the trigger member to free the hammer from the disconnector to permit the hammer and the trigger member to pivot to the set positions so that the user can actuate the trigger member to fire the firearm again; and wherein in the forced reset semi-automatic position, rearward movement of the bolt means causes rearward pivoting of the hammer causing the trigger member to be forced to the set position, and the disconnector hook is prevented from catching the hammer hook, and thereafter when the bolt means reaches a substantially in-battery position or an in-battery position the user can actuate the trigger member to fire the firearm again. a hammer having a hammer sear surface and a hammer hook and adapted to be mounted in a fire control mechanism pocket of a receiver to pivot on a transverse hammer pivot axis between set and released positions, the hammer adapted to be pivoted rearward by rearward movement of a bolt means; a trigger member having a trigger member sear surface and adapted to be mounted in the fire control mechanism pocket to move between a set position and a released position, rearward pivoting of the hammer causing the trigger member to be forced to the set position; wherein the hammer sear surface and trigger member sear surface are in engagement in the set position of the hammer and the set position of the trigger member and are out of engagement in the released position of the hammer and the released position of the trigger member; a disconnector having a disconnector hook for engaging the hammer hook and adapted to be mounted in the fire control mechanism pocket to pivot on a transverse disconnector pivot axis a locking member adapted to be movably mounted in the fire control mechanism pocket, the locking member being movable 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 and adapted to be moved to the second position by forward movement of the bolt; and a safety selector adapted to be movably mounted in the fire control mechanism pocket to move between at least a safe position, a standard semi-automatic position, and a forced reset-semi-automatic position; wherein in the standard semi-automatic position, rearward movement of the bolt means causes rearward pivoting of the hammer such that the disconnector hook catches the hammer hook, at which time a user must manually release pressure on the trigger member to free the hammer from the disconnector to permit the hammer and the trigger member to pivot to the set positions so that the user can actuate the trigger member to fire the firearm again; and wherein in the forced reset semi-automatic position, rearward movement of the bolt means causes rearward pivoting of the hammer causing the trigger member to be forced to the set position, and the disconnector hook is prevented from catching the hammer hook, and thereafter when the bolt means reaches a substantially in-battery position or an in-battery position the user can actuate the trigger member to fire the firearm again.

Google Patents

https://patents.google.com/patent/US12636403

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12636403