Page 82 - FAT 105 4.17 MOODLE
P. 82
Figure 6a & 6b: Lever delayed blowback action.
The short arm is called the resistance The lever delayed blowback system
arm and the long is called the ef- relies on the mechanical disadvan-
fort arm. When used for mechanical tage that can be created by a lever.
advantage, force applied to the effort The system utilizes a two-piece bolt/
arm will be transferred and multiplied carrier assembly and a lever. During
to the resistance arm. This will allow discharge, when the case begins to
you to generate great force with mini- force the bolt head rearward, it in-
mal effort, like moving a large boulder stantly begins acting against the lever.
with a log. This also requires a greater The resistance arm rests in a slot in
range of motion from the effort side. the receiver against a leverage sur-
face. When the bolt moves back, the
When used for mechanical
resistance arm will instantly bottom
disadvantage, force is applied to the
out against the receiver and cause
resistance arm. The resistance arm
the lever to rotate, driving the effort
will resist the force being applied,
arm into a slot in the carrier. The
while pivoting around the fulcrum
slight movement of the resistance arm
and transferring force to the effort
causes the effort arm to drive the car-
arm. Any slight movement of the
rier rearward at a greater velocity than
resistance arm will be magnified in
the bolt. This causes the bolt to slow
movement of the effort arm.
and the chamber to delay opening.
78
