Sliding Trigger Device for Repeater Rifle Magazine Access
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Solution Overview
Problem
Existing bolt-action rifle receivers require a large, load-bearing hinge for the trigger cover, which is cumbersome and prone to wear when opening for magazine insertion or removal, necessitating a more precise and stable mechanism.
Innovation Solution
A slidably guided trigger device using a longitudinal guide on the underside of the receiver, allowing the trigger to move between closed and open positions without folding, providing precise and low-wear operation with reduced space requirements and increased support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hinge-connected cover is used to cover the magazine shaft, then the trigger device can be moved between closed and open positions, but the hinge experiences considerable load and wear requiring large space for operation
Solution Approach 1:
The patent replaces the traditional hinge-based mechanical connection with a longitudinal guide system that uses linear guidance surfaces. The trigger device slides along guide rails with corresponding guide grooves, eliminating the hinge joint and its associated wear and load issues. This substitution transforms rotational hinge motion into linear sliding motion, significantly improving reliability while maintaining operational ease.
Solution Approach 2:
The trigger device is segmented into distinct components: the trigger guard, the magazine cover, and the longitudinal guide elements. This segmentation allows the magazine cover to be independently movable along the guide rails, separating the covering function from the triggering function. The longitudinal guide itself is divided into multiple guide surfaces that work together to provide stable linear guidance.
2Strength
If a large cover is used to cover the magazine shaft, then the trigger elements are protected, but the cover requires considerable space when pivoted down for magazine removal
Solution Approach 1:
Instead of pivoting the cover downward as in traditional designs, the patent inverts the movement direction by sliding the trigger device forward along the longitudinal guide. The magazine cover moves in a linear forward direction rather than rotating downward, eliminating the need for large clearance space below the trigger device while maintaining protection when closed.
Solution Approach 2:
The patent changes the movement dimension from vertical pivoting to horizontal sliding. The longitudinal guide provides guidance in the forward direction, allowing the trigger device to move along the length of the receiver rather than requiring vertical clearance. This dimensional change eliminates the space conflict below the trigger device.
3Manufacturing precision
If the trigger device is slidably guided via a longitudinal guide, then precise and low-wear guidance is achieved, but the guide structure adds complexity to the receiver design
Solution Approach 1:
The longitudinal guide structure is merged with the receiver body itself. The guide rails are integrated into the receiver's internal geometry, and the guide grooves are formed directly on the trigger device components. This merging eliminates the need for separate, complex guide assemblies while achieving precise linear guidance through carefully designed mating surfaces.
Data Source
Figure 1
Figure 2~3
AI summary
The system box (1) has a magazine shaft (8) for receiving a removable magazine (2), and a trigger device (3) which is moved between a closing position for covering the magazine shaft and an opening position for insertion or extraction of the magazine. The trigger device is arranged at the lower side of the system box over a longitudinal guide in displaceable manner.