Straight-pull rifle closure with integrated locking sleeve rod
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Solution Overview
Problem
Existing breech designs for straight-pull repeating rifles are prone to unintentional opening due to gas pressure and are not adaptable to different calibers, posing safety risks and complexity in structure.
Innovation Solution
A one-piece locking sleeve rod with a surrounding locking spring and a stop element with pressure relief slots, along with an articulated chain link connection, provides enhanced rigidity and safety against unintentional opening, allowing for adaptation to various calibers through a modular design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a chain link is articulated to the locking rod with an offset arrangement, then the bolt handle can pivot between open and closed positions, but the articulated connection can be unintentionally opened by axial force acting on the bolt
Solution Approach 1:
The locking rod and locking sleeve are merged into a single integrated component (locking sleeve rod), eliminating the articulated chain link connection that was susceptible to unintentional opening. This integration maintains the pivoting function while eliminating the weak articulated joint.
Solution Approach 2:
Instead of using an articulated chain link that allows unintended movement, the invention inverts the approach by creating a rigid integrated structure where the locking rod and sleeve form a unified component, preventing unintended pivoting while maintaining controlled operation.
2Reliability
If spring-loaded wedges and detents are added to prevent unintentional pivoting, then safety against unintentional opening is improved, but the overall breechblock design becomes complex
Solution Approach 1:
The invention combines the locking rod and locking sleeve into a single integrated component, eliminating the need for multiple separate springs, wedges, and detents. This integration achieves safety against unintentional opening while maintaining a simple, clean design without additional complex elements.
Solution Approach 2:
The invention extracts and removes the unnecessary spring-loaded wedges, detents, and multiple springs from the design. By using the integrated locking sleeve rod, these complex safety elements are eliminated entirely, achieving safety through structural integration rather than additional components.
3Reliability
If a locking spring acts on the chain link in the direction of closed position, then unintentional opening is prevented, but the structure becomes more complex
Solution Approach 1:
The locking spring is integrated directly into the locking sleeve rod structure, acting on the unified component rather than on a separate chain link. This integration provides closing position stability while avoiding the complexity of additional springs and articulated connections.
Solution Approach 2:
The invention removes the separate chain link that would require a locking spring to act upon it. By integrating the locking rod and sleeve, the need for additional locking springs acting on separate components is eliminated, achieving stability through the integrated structure itself.
4Ease of manufacture
If the locking sleeve and locking rod are designed as separate pieces, then manufacturing is easier, but rigidity and precision are reduced
Solution Approach 1:
The locking sleeve and locking rod are merged into a single locking sleeve rod component manufactured as one piece. This integration eliminates assembly errors and interfaces, achieving high precision and rigidity in the closure mechanism while maintaining manufacturing feasibility through modern one-piece forming techniques.
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
The solution significantly reduces the risk of unintentional breech opening and allows for easy adaptation to different calibers, ensuring high precision and safety while maintaining a simplified and stable closure mechanism.
Implementation Method 1
a locking spring is provided surrounding the locking sleeve rod and acting on the chain link in the direction of its closed position
Implementation Method 2
a stop element with pressure relief slots
Data Source
Figure 1
Figure 2~6
Figure 4~7
AI summary
In a bolt (1) for a straight-pull repeating rifle, which has a bolt body (2) and a locking sleeve guided therein, and a locking rod guided in the bolt body (2) and integrally connected with the locking sleeve, which locking rod connects a bolt head (3) facing a cartridge chamber to a bolt handle (4) via a chain link (5), wherein the chain link (5) is pivotally connected to the locking rod and the bolt handle (4), and the bolt handle (4) is pivotable between an open and a closed position of the bolt (1) and interacts with a firing pin nut (7) connected to a firing pin (6), and furthermore a bolt head (3) is provided which can be inserted into a bolt sleeve (8) at an end of the bolt (1) facing away from the bolt handle (4),The locking sleeve and the locking rod are designed as a one-piece locking sleeve rod (9), and a locking spring (10) surrounding the locking sleeve rod (9) and acting on the chain link (5) in the direction of its closed position is provided, as well as the use of the same.