UndeadRat

PATENT BREAKDOWN: US 4,023,465. INVENTOR: Thomas C. Inskip. WHEN: 1977. STATUS: Expired. Thomas teaches a forced reset trigger for the AK-47. While his main focus is a rather absurd variable rate of fire concept, the core mechanism is a capable three position forced reset trigger. Yes, three position in 1977! The system is similar to the FRT-15, but adds a robust method of selection: See Fig. 5. As the carrier moves rearward a cam surface (dark green) pushes down on the plate (yellow) which in turn forces the tail of the trigger (blue) down, moving the trigger into the reset position. The red part is what we would now call a locking bar, it holds the trigger in the reset position via the pin (orange) until the carrier moves back into battery, the trip surface (third drawing, light green) rotating the locking bar so that it no longer holds the pin. Fig. 6 shows how the plate (yellow) can be rotated to the rear so that it cannot engage the trigger, this prevents the forced reset much like the Super Safeties transverse movement. The patents own words are: "Upon further rearward movement of the carrier 20 as shown in FIG. 5 the cam surface 142 forces the trigger depressor plate 132 down against the upper surfaces of the trigger ribs 44 and 46, thereby causing the trigger 38 and the secondary member 56 to pivot counterclockwise (forwardly) even though the operator's finger may still be exerting pressure on the projection 42." And "The sear 108 remains in the down position until the carrier 20 has moved all the way forward (FIG. 1). The cam surface 104 on the carrier has now engaged the cam surface 102 on the disengagement arm 98 so as to pivot the arm 98, its rod 106 and its sear 108 clockwise to a position in which the sear 108 is out of contact with the sear pin 116.... At this point the operator's finger pressure on the trigger projection 42 may cause the rifle to fire again."

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