Compact Bolt Cocking Mechanism for Repeating Rifle Ergonomics
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Solution Overview
Problem
Existing breech mechanisms for repeating weapons are not compactly constructed nor easy to use, lacking an alternative secure operating option that ensures ergonomic handling and safety, particularly for cocking the firing spring.
Innovation Solution
A compact cocking mechanism integrated into the lock with a sliding cocking slide that can be operated by thumb movement, featuring a tensioning mechanism with a sliding sleeve, pressure sleeve, and pivoted actuating lever, along with a safety device to prevent unintentional actuation, allowing for ergonomic and secure cocking without hand reconfiguration for left- or right-handed shooters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional cocking lever with articulated lever and clamping rod is used, then the cocking mechanism can be constructed, but the mechanism becomes complex and difficult to operate ergonomically
Solution Approach 1:
The cocking mechanism is segmented into distinct functional components: a cocking slide for primary actuation, a sliding sleeve for intermediate motion conversion, and a pivoted actuating lever for final spring tensioning. This segmentation allows each component to perform a specific function efficiently, reducing overall complexity while improving ergonomics.
Solution Approach 2:
The mechanism employs dynamic motion conversion where the linear motion of the cocking slide is transformed through the sliding sleeve into rotational motion of the actuating lever. This dynamic transformation enables ergonomic linear pushing motion to effectively tension the mainspring through lever mechanical advantage.
2Volume of moving object
If the cocking mechanism is integrated into the lock, then the overall structure becomes more compact, but the operating space and accessibility may be reduced
Solution Approach 1:
The cocking slide is positioned in the rear region of the lock, utilizing the longitudinal dimension of the weapon structure. This dimensional placement allows the cocking mechanism to be integrated into the compact weapon body while maintaining accessibility from the rear, where there is sufficient space for thumb operation without interfering with the grip or trigger area.
3Ease of operation
If the cocking slide is positioned for easy thumb operation, then ergonomic handling is improved, but the risk of unintentional actuation increases
Solution Approach 1:
A safety device is implemented that requires deliberate dual-action: the shooter must simultaneously press the safety button and push the cocking slide forward. This preliminary anti-action mechanism prevents accidental cocking while maintaining ease of intentional operation, as the safety button provides a clear tactile indication of the weapon's state and requires conscious activation.
4Reliability
If a safety device with multiple positions is added, then security and accidental prevention are improved, but the operating steps and complexity increase
Solution Approach 1:
The safety device is merged with the cocking slide assembly, sharing the same structural housing and actuation mechanism. The safety button is integrated into the cocking slide's rear face, and the transverse pin mechanism is combined with the slide's motion path. This merging reduces overall device complexity while maintaining the two-position safety functionality.
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 provides a compact, easy-to-use cocking mechanism that enhances handling and safety by allowing ergonomic cocking just before firing, with enhanced security features preventing accidental opening of the breech.
Implementation Method 1
a mainspring (13) which can be tensioned and fired in the firing direction
Implementation Method 2
The friction between the actuating lever and the sliding sleeve can be minimized
Data Source
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AI summary
The invention relates to a bolt (1) of a repeating weapon comprising a chamber body (3) rotatably about its longitudinal axis and axially displaceable in the longitudinal direction of the weapon within a housing (2), a firing pin (12) axially movable in the chamber body (3), and a locking lug (5) arranged at the rear end of the chamber body (3), in which a cocking mechanism (8, 19, 24) actuated by a control element is housed for cocking and uncocking a firing spring (13) that acts upon the firing pin (12). The control element is a cocking slide (23) that is displaceable on the rear of the locking lug (5) between a lower uncocked position and an upper cocked position.