Auto-sear Non-planar Front Surface Geometry for Firearm Cycling
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Solution Overview
Problem
Traditional auto-sears used in larger firearm platforms like the AR10 or SR25 are not effective in facilitating fully-automatic operation due to insufficient geometry, leading to inadequate firing and cycling performance.
Innovation Solution
The design of an auto-sear with a body having a non-planar front surface, featuring an upper portion on a first plane and a lower portion on a second plane, with an angular offset, and a u-shaped profile for the upper sear trip engagement portion, which allows for smoother hammer release and reduced wear on internal components, enabling improved cycling and clearance within the lower receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional auto-sear geometry is used in larger firearm platforms, then the device complexity remains simple, but the reliability of fully-automatic operation deteriorates due to insufficient geometry
Solution Approach 1:
The auto-sear body features a non-planar front surface with an upper portion on a first plane and a lower portion on a second plane, where at least a portion of the first plane is non-planar with the second plane. This local geometric differentiation optimizes interaction with specific firearm components (hammer, disconnector, trigger, bolt connector) to ensure reliable fully-automatic operation in larger platforms like AR10 or SR25 without requiring complete redesign of the entire auto-sear structure.
2Ease of operation
If the auto-sear front surface is made non-planar with angular offset, then the cycling smoothness improves, but the manufacturing precision requirements increase
Solution Approach 1:
The invention specifies that the upper portion of the front surface is disposed on a first plane and the lower portion is disposed on a second plane, with at least a portion of the first plane being non-planar with the second plane. This parameter change from a planar to a non-planar surface configuration enables smoother cycling action by optimizing the angular relationship between different portions of the auto-sear body during operation.
3Productivity
If the leading top body surface edge is positioned forward relative to the leading bottom surface edge, then the clearance within the lower receiver improves, but the shape complexity of the auto-sear body increases
Solution Approach 1:
The invention positions the leading top body surface edge in a forward position with respect to the leading bottom surface edge relative to the proximal leg end, creating a stepped or offset configuration in the longitudinal dimension. This dimensional arrangement optimizes clearance within the lower receiver and improves cycling efficiency by ensuring proper spacing between the auto-sear and surrounding components during operation.
Data Source
AI summary
Various embodiments are directed to auto-sears for a firearm, firearms, and methods of operating the same. In various embodiments, an auto-sear for a firearm may comprise a body configured to being pivotally mounted within a lower receiver of the firearm, the body having a front surface defined between a leading top body surface edge of a top surface and a leading bottom surface edge of a bottom surface; wherein an upper portion of the front surface is disposed on a first plane and a lower portion of the front surface is disposed on a second plane; and wherein at least a portion of the first plane is non-planar with the second plane. In various embodiments, the top surface of the body comprises a curved shape defined along a portion of the leading top surface edge.