US 12,352,517 B2
Detent delayed blowback system and methods
Kevin W Gibbens, Show Low, AZ (US); and David W. Gibbens, Show Low, AZ (US)
Assigned to Peppermill Design, LLC, Show Low, AZ (US)
Filed by Peppermill Design, LLC, Show Low, AZ (US)
Filed on Oct. 31, 2023, as Appl. No. 18/498,593.
Claims priority of provisional application 63/381,724, filed on Oct. 31, 2022.
Prior Publication US 2024/0142185 A1, May 2, 2024
Int. Cl. F41A 3/46 (2006.01); F41A 3/26 (2006.01); F41A 3/86 (2006.01)
CPC F41A 3/86 (2013.01) [F41A 3/26 (2013.01); F41A 3/46 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A delayed blowback system for a firearm, the system comprising:
a bolt with a bolt face and two detent members operatively coupled within the bolt, each detent member comprising a detent; and
a recoil spring guide rod comprising two matching recesses on opposing sides of the recoil spring guide rod, wherein the bolt and the two detent members are coupled to and slidable along the recoil spring guide rod between a firing position and a recoil position, wherein:
the firing position comprises the detents of the detent members resting in the matching recesses on the recoil spring guide rod and in position for firing a round;
movement from the firing position to the recoil position comprises, in response to the round being fired, a cartridge case of the round applies an initial force on the bolt face of the bolt in a direction opposite a barrel of the firearm, and wherein a geometry of the detents of the detent members and a geometry of the matched recesses in the recoil spring guide rod operate to force the detent members in opposite directions and perpendicular to the direction of the initial force; and
moving the bolt along the recoil guide rod in the direction of the initial force to perform a recoil cycle and moving the bolt back to the firing position.
 
6. A method of delaying blowback of a bolt of a firearm, the method comprising:
in response to firing a round from a firearm, applying an initial force to a bolt of the firearm in a direction opposite of a barrel of the firearm, wherein detents of detent members coupled within the bolt rest within matching recesses in a recoil spring guide rod prior to firing the round;
delaying recoil of the bolt along a recoil spring guide rod, wherein delaying the recoil comprises moving the detents and detent members in opposite directions and perpendicular to the direction of the initial force exerted on the bolt in response to a geometry of the detents of the detent members and a geometry of the matched recesses in the recoil spring guide rod operating to force the detents and detent members in opposite directions and perpendicular to the direction of the initial force exerted on the bolt;
after delaying recoil of the bolt, moving the bolt along the recoil spring guide rod in the direction of the initial force to perform a recoil cycle; and
moving back to the firing position.