3-cycle 2-stroke damper

What is this patent about?

’511 is related to the field of automatic and semi-automatic firearm recoil management. Specifically, it addresses the need to control the reciprocation rate of a gun bolt by using a fluid-based damping system that manages energy throughout both the rearward and forward strokes of the firing cycle.

The underlying idea behind ’511 is to utilize a captive pulse damper that acts as a dual-action air spring and heat rejection engine. By trapping air within a piston-cylinder assembly, the system converts kinetic energy into heat through compression during the rearward stroke, exhausts that heat to the atmosphere to prevent energy recovery, and then creates a vacuum to resist the bolt's return travel.

The claims of ’511 focus on a damping mechanism where the rearward motion of the gun bolt compresses fluid to a threshold that physically unseats the cylinder from its mounting surface. This unseating action creates a temporary vent that allows high-pressure fluid to escape, effectively dumping energy before the bolt begins its forward return stroke.

In practice, the system functions as a three-cycle process within a two-stroke mechanical movement. As the bolt moves back, the piston drives into the cylinder, and once the internal pressure overcomes a biasing spring, the cylinder lifts to exhaust the hot, compressed air. When the bolt reverses direction, the cylinder reseals, and the retreating piston creates a partial vacuum that pulls against the bolt, slowing its forward velocity until the piston eventually clears the cylinder bore.

This approach differs from traditional buffers by actively rejecting energy rather than simply storing and returning it via a spring. By combining asymmetric damping—high-pressure resistance on the way back and vacuum resistance on the way forward—the invention achieves a significantly lower operating speed and smoother recoil profile without requiring the excessive reciprocating mass found in conventional heavy buffers.