Dual Cam Bolt Mechanism for Smooth Rifle Locking
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Solution Overview
Problem
Existing bolt-action rifle breech mechanisms do not provide smooth and reliable movement, as they rely on a single cam element for actuation, which limits force transmission and axial displacement, resulting in inefficient operation.
Innovation Solution
The use of two cam elements, one for secure locking and the other for axial displacement, with a support sleeve that spreads the locking elements to ensure stable engagement with the barrel, allowing for even movement with reduced effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single cam element is used for actuation, then the device complexity is reduced, but the force transmission and axial displacement are limited, resulting in inefficient operation
Solution Approach 1:
The single cam element is divided into two separate cam elements: a first cam element for secure locking with high force transmission, and a second cam element for axial displacement with small pivoting movement. This segmentation allows each cam element to be optimized for its specific function, resolving the contradiction between operational efficiency and device complexity.
2Reliability
If the locking sleeve is spread open to move locking elements into locking position, then secure locking is achieved, but the force transmission requires optimization
Solution Approach 1:
The first cam element is designed with appropriate lever ratios that dynamically adjust force transmission during the locking process. As the locking sleeve spreads open and locking elements engage, the cam element's geometry optimizes the force vector to ensure secure locking while maintaining efficient force transmission throughout the movement cycle.
3Length of moving object
If a small pivoting movement of the breech lever is used, then the axial displacement is reduced, but the locking guide displacement is insufficient
Solution Approach 1:
The second cam element converts a small pivoting movement of the breech lever (rotational dimension) into the required axial displacement of the locking guide (linear dimension). Through the cam's geometric profile, a small rotation angle produces the necessary linear displacement to push the locking chamber into the barrel, resolving the contradiction between movement magnitude and locking reliability.
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
This design enhances the smoothness and reliability of the breech movement, ensuring secure locking and efficient operation with minimal effort, thereby improving the overall performance of the bolt-action rifle.
Implementation Method 1
The first cam element is designed in such a way that it ensures good force transmission when the locking sleeve is spread open to move the locking elements into the locking position via appropriate lever ratios. The shape of the second cam element with the additional control cam, on the other hand, is selected in such a way that even a small rotation of the locking lever can bring about a comparatively large axial displacement of the locking guide relative to the receiver.
Implementation Method 2
The locking sleeve designed as an expanding sleeve is divided at its front end into several flexible spring tongues by longitudinal slots. At their front ends, the spring tongues have locking elements for engaging in an annular groove on the inside of the barrel.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a bolt (2) for a repeating rifle with a bolt guide (7), a locking chamber (18) arranged in the bolt guide (7), a locking sleeve (10) arranged concentrically to the locking chamber (18) with several locking elements (13) movable between an inner release position and an outer locking position by means of a spreading device (15, 33) and a locking lever (27) arranged in the bolt guide (7) and actuated by means of a bolt handle (29), to which a first cam element (41 a) rotatably arranged in the bolt guide (7) with a rear contact surface (51 a) for support against a fixed control element (47) is assigned.To enable a particularly smooth and reliable locking action, the locking lever (27) is assigned a second cam element (41b) which is rotatable independently of the first cam element (41a) and has a rear control cam (48) for support against the fixed control element (47).