Eccentric Bolt Lever Converts Linear Stroke to Rotational Locking
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Solution Overview
Problem
Existing breech blocks for firearms have limitations in secure locking mechanisms, particularly in straight-pull designs, with small rotational angles and unreliable locking elements, complicating handling and disassembly.
Innovation Solution
A breech block design featuring a rotatable breech head with a bolt lever pivotably mounted eccentric to the bolt's longitudinal axis, utilizing an intermediate piece connected to the control piece for a long longitudinal stroke converted into a large rotational angle, enhanced by a locking pin and spring-loaded rocker for secure locking and tool-free disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the breech head is mounted rotatably in the bolt with a control piece for axial displacement, then the locking reliability is improved through larger rotational angle, but the device complexity increases due to additional intermediate pieces and eccentric mounting mechanisms
Solution Approach 1:
An intermediate piece is introduced as a mediator between the control piece and the bolt lever. This intermediate piece features an eccentric mounting arrangement where the control piece can be axially displaced relative to the bolt, while the bolt lever is pivotably mounted on the intermediate piece. This intermediary structure enables the conversion of axial displacement into effective rotational motion of the breech head with a larger angle, thereby improving locking reliability without requiring direct complex coupling between the control piece and bolt lever.
Solution Approach 2:
The invention employs eccentric mounting in a radial dimension, where the bolt lever is pivotably mounted on the intermediate piece at an offset position rather than concentrically. This eccentric arrangement in the radial dimension allows the axial displacement of the control piece to generate a larger rotational arc of the breech head, effectively converting linear motion into rotational motion with enhanced angular displacement, thus improving locking reliability.
2Reliability
If the bolt lever is pivotably mounted eccentric to the longitudinal axis of the bolt, then the rotational angle of the breech head is increased for secure locking, but the ease of operation deteriorates due to altered lever geometry and contact point positioning
Solution Approach 1:
The intermediate piece serves as a mediator that absorbs the geometric complexity of the eccentric mounting arrangement. By providing a dedicated mounting interface for the bolt lever at an eccentric position relative to the bolt's longitudinal axis, the intermediate piece enables the lever to achieve a larger rotational arc and thus a larger breech head rotation angle for secure locking, while presenting a simpler, more ergonomic interface to the operator through the lever's external geometry.
3Reliability
If the control piece has a long longitudinal stroke converted into large rotational angle, then the locking security is enhanced, but the device complexity increases due to the intermediate piece and eccentric mounting mechanism
Solution Approach 1:
The invention utilizes eccentric mounting in the radial dimension to convert the longitudinal stroke of the control piece into a larger rotational angle of the breech head. The intermediate piece provides an offset mounting position for the bolt lever, such that axial displacement of the control piece generates a lever arm effect, amplifying the rotational motion. This dimensional transformation enables enhanced locking security through increased rotational angle without proportionally increasing the complexity of the control mechanism.
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 design achieves secure locking with a significantly larger rotational angle of the breech head, improving handling and disassembly convenience, and ensuring reliable operation by converting the bolt lever's motion into a substantial rotational motion of the breech head.
Implementation Method 1
the bolt lever can be pivoted about an axis that extends eccentric to the longitudinal axis of the bolt
Implementation Method 2
enhanced by a locking pin and spring-loaded rocker for secure locking
Data Source
AI summary
The present invention relates to a breech block for firearms, particularly for repeating firearms, comprising a cartridge chamber, an external case and a bolt accommodated therein, wherein the bolt features a breech head in the region facing the cartridge chamber and a control piece is arranged within the bolt such that it can be axially displaced relative to the bolt and relative to the breech head, with said breech block furthermore comprising a bolt lever that is connected to the control piece such that the breech head is unlocked during a backward motion and locked during a forward motion of the bolt lever, wherein the bolt lever is pivotably mounted in the rear end region of the case and the bolt lever can be pivoted about an axis that extends eccentric to the longitudinal axis of the bolt, wherein the control piece is according to the invention connected to the bolt lever by means of an intermediate piece, which protrudes radially outward from the bolt, the breech head is mounted in the bolt such that it is rotatable about its axis, and the breech head is rotated by axially displacing the control piece.