Rotary Lockup Action Bolt Guide Rail Timing
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Solution Overview
Problem
Existing firearm mechanisms, such as those in the Ruger 10/22, face challenges in efficiently managing the bolt position and rotation for accurate firing and reloading, particularly in maintaining the bolt in a forward position to enhance muzzle velocity and accuracy, while also ensuring the firearm is not fired out of battery.
Innovation Solution
The proposed firing mechanism incorporates a bolt guide rail, a rotatable charge handle, a timing lock arm, and a T-slot engagement system, which allows the bolt to slide longitudinally while preventing vertical and transverse movement, ensuring the bolt remains in the correct position for firing and prohibits the charge handle from rotating when not in the most forward position, thus enhancing the rotary lockup action and preventing accidental discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bolt is allowed to move freely for reloading operations, then the ease of operation is improved, but the reliability deteriorates due to risk of firing out of battery
Solution Approach 1:
The timing lock arm serves as an intermediary component between the charge handle and the trigger mechanism. It mediates the relationship by allowing charge handle rotation during reloading while simultaneously preventing trigger actuation unless the bolt is properly forward, thus resolving the contradiction between ease of reloading and safety against accidental discharge
Solution Approach 2:
The timing lock arm dynamically changes its locking state based on bolt position. When the bolt is forward, the timing lock arm allows rotation; when the bolt is rearward, it prohibits rotation. This dynamic behavior enables easy reloading when safe while preventing accidental discharge when the bolt position is uncertain
2Ease of operation
If the charge handle can rotate freely, then the ease of operation for cycling is improved, but the reliability worsens due to inability to prevent out-of-battery firing
Solution Approach 1:
The timing lock arm acts as a mediator that stands between the charge handle rotation and the firing mechanism. It allows rotation during proper cycling operations but intercepts and prevents rotation that would lead to firing when the bolt is not forward, thus maintaining both ease of operation and reliability
3Manufacturing precision
If the bolt is constrained to prevent vertical and transverse movement, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The constraint mechanism is segmented into separate functional elements: the T-slot provides guidance in one dimension, while the timing lock arm provides constraints in other dimensions. This segmentation allows each component to be simpler while collectively achieving precise bolt positioning without requiring a single complex constraint mechanism
Solution Approach 2:
The T-slot engagement constrains the bolt by allowing movement along its length while preventing vertical and transverse movement through engagement in perpendicular dimensions. This dimensional approach to constraint simplifies the overall mechanism by using the slot geometry rather than multiple separate constraint components
Data Source
AI summary
Disclosed herein is a rotary lockup action including a firing mechanism for a firearm. The firearm including a receiver having a cavity therein configured to accept the firing mechanism. The firing mechanism comprising a bolt guide rail fixed to the inner surface of the cavity of the receiver. The firing mechanism also comprises a bolt sliding along a longitudinal axis on the bolt guide rail. Also disclosed is a change handle rotatably mounted to the bolt so as to rotate relative thereto about a vertical axis orthogonal to the longitudinal axis. The charge handle may be mounted to the bolt so as to longitudinally reposition therewith. The charge handle having a surface defining a cut therein aligned with a slot in the bolt when the bolt is in a rearward position; and wherein the surface defining a cut in the charge handle is not aligned with the slot in the bolt when the bolt is in a forward position.