Monolithic Extended Bolt Release for Rifle Reliability
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Solution Overview
Problem
Existing extended bolt release mechanisms for rifles, such as those in AR-15 and AR-10 designs, are prone to loosening due to repeated use and harsh conditions, requiring removable attachments that can fail over time and do not accommodate thick upper receivers.
Innovation Solution
A monolithic extended bolt release (EBR) with a bolt stop and integral extension arm, securely mounted via a pin aperture, providing a single-piece construction that resists loosening and integrates directly with the firearm body, allowing reliable operation under shock and stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If removable attachments are used for bolt release mechanisms, then ease of installation and removal is improved, but reliability deteriorates due to loosening from repeated use and harsh conditions
Solution Approach 1:
The extension arm is integrally formed with the bolt stop as a single monolithic piece, eliminating the interface between separate components that would otherwise allow loosening. This merging of parts resolves the contradiction by maintaining permanent attachment while simplifying the overall structure.
Solution Approach 2:
The monolithic EBR is pre-formed as a complete unit with the extension arm and bolt stop already integrated, eliminating the need for field assembly or attachment of separate components. This preliminary integration ensures reliability from installation while maintaining ease of installation as a complete unit.
2Device complexity
If traditional bolt stops are used, then device simplicity is maintained, but adaptability deteriorates due to inability to accommodate thick upper receivers
Solution Approach 1:
The extension arm adds a new spatial dimension to the traditional bolt stop by extending through the trigger opening to the opposite side of the receiver. This dimensional extension maintains the simple monolithic structure while adapting to thick upper receivers that prevent access to traditional bolt stop locations.
Solution Approach 2:
The EBR is functionally segmented into the bolt stop portion and the extension arm portion, allowing each to perform its specific function while remaining integrally formed. This functional segmentation within a monolithic structure enables adaptability to different receiver thicknesses without increasing overall complexity.
3Ease of operation
If extension arms pass through trigger openings, then ease of operation is improved for bolt release, but device complexity increases due to integration requirements
Solution Approach 1:
The extension arm and bolt stop are merged into a single integrally formed component, eliminating the complexity of assembling multiple parts while enabling the extension arm to pass through the trigger opening for improved operational accessibility.
Data Source
AI summary
In some embodiments, a monolithic extended bolt release (EBR) for a rifle includes a rifle mount including a pin aperture for securing the EBR to the rifle case/housing, a bolt stop plate integrally formed with the rifle mount for stopping the rifle bolt, and an extension arm integrally formed with the rifle mount and bolt stop plate. The extension arm includes a vertical straight arm extending from the rifle-mounting part to a trigger opening when the EBR is mounted on a rifle, and a horizontal straight arm connected to the vertical straight arm and passing through the trigger opening. A right-handed rifle user can release the bolt by pressing with finger(s) on the EBR on the right of the rifle, pivoting the EBR about the mounting pin, lowering a bolt stop plate of the EBR and allowing release of the bolt and reloading of the rifle. The EBR design displays superior reliability over extended periods of use in harsh conditions.