Ambidextrous Bolt Catch Release Using a Spring-Biased Cam Plunger
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Solution Overview
Problem
Existing bolt catches in auto-loading firearms lack ambidextrous operation, which complicates reloading and maintenance, especially for shooters with a non-dominant hand, and may hinder mechanical function with unnecessary inertial load or friction.
Innovation Solution
An ambidextrous bolt release mechanism featuring a spring-biased actuator plunger and bolt catch lever, allowing operation from either side of the firearm, with a camming surface design to ensure ergonomic and reliable actuation, enabling easy reloading and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional single-sided bolt catch lever is used, then the mechanism is mechanically simple, but it lacks ambidextrous operation capability and hinders reloading efficiency for shooters with non-dominant hand
Solution Approach 1:
The bolt catch mechanism is segmented into two separate components: a bolt catch lever on one side and a plunger actuator on the opposite side. This segmentation allows each component to be optimized for its specific function while collectively providing ambidextrous operation capability without requiring a fully symmetric complex mechanism.
Solution Approach 2:
The plunger actuator serves multiple functions: it can be used by shooters with non-dominant hand for ambidextrous operation, and it provides an alternative actuation method that complements the traditional lever. This multi-functionality increases adaptability without proportionally increasing complexity.
2Productivity
If a spring-biased plunger actuator is added for ambidextrous operation, then reloading efficiency and ergonomics are improved, but the device complexity and potential inertial load increase
Solution Approach 1:
The spring-biased plunger actuator is designed to be self-servicing through its spring mechanism that automatically returns the plunger to its neutral position after actuation. This eliminates the need for additional reset mechanisms or complex control systems, improving reloading efficiency while keeping the added complexity minimal.
3Reliability
If the plunger is spring-biased to remain disengaged, then reliability is improved by avoiding unnecessary inertial load and friction, but the mechanism requires additional spring components
Solution Approach 1:
The spring mechanism replaces what would otherwise require a powered or actively controlled system to maintain the disengaged state. By using passive spring mechanics instead of active control, the system achieves higher reliability through reduced inertial load and friction while the spring component integrates seamlessly with existing bolt catch structures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates quick and easy reloading by allowing operation from either side, enhancing ergonomic efficiency and reliability, particularly beneficial for competitive shooting and accommodating shooters with different dominant hands.
Implementation Method 1
a spring-biased actuator plunger accessible from the opposite side of the firearm
Implementation Method 2
The plunger is spring-loaded in a direction away from the bolt catch lever to the degree that avoids actuation of the lever until the plunger is manually actuated
Implementation Method 3
The bolt catch lever includes an inclined camming ramp which forms an operating surface that is in turn acted upon by a complementary angled inclined camming surface defined by a working end of the actuator plunger
Implementation Method 4
The inclined camming surface of the actuator plunger acts as a wedge that pries and rotates the bolt catch lever out of engagement with the bolt
Implementation Method 5
A flat-to-flat sliding interface is formed in one embodiment between the inclined camming surface and ramp
Data Source
AI summary
A firearm with ambidextrous bolt release mechanism includes a barrel and a bolt slideably mounted in the receiver for axial movement between forward closed breech position in battery with the barrel and a rearward open breech position. A recoil spring biases the bolt forward. A side-mounted bolt catch lever is configured and operable to selectively hold the bolt in the open breech position, and disengage the bolt to reclose the breech when manually actuated. A transversely movable actuator plunger allows a user to release the bolt from the side of the firearm opposite the bolt catch lever side. The plunger comprises an inclined camming surface which slideably engages a mating inclined camming ramp on the lever. Wedging action applied to the bolt catch lever by the plunger rotates the lever about its pivot axis to disengage and release the bolt.