Break-Action Firearm Hinge Adjustment via T-Groove
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Solution Overview
Problem
Existing break-barrel weapons face challenges in achieving simple and precise adjustment of the hinge action between the breech housing and the tiltable barrel part, requiring complex manual rework to align contact surfaces.
Innovation Solution
A break-barrel weapon design featuring a T-groove receiving groove and a T-nut clamping piece that allows for longitudinal and rotational adjustment, secured by a threaded pin, with an eccentric adjusting element to precisely set and secure the contact surfaces without manual rework.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional receiving groove and clamping piece design is used, then the structure is simple, but the adjustment of hinge action is complex and requires manual rework
Solution Approach 1:
The receiving groove is designed with an asymmetric T-shape cross-section, having a narrower outer part and a widened inner part. The clamping piece corresponds with a T-nut shape with narrower upper part and wider lower part. This asymmetric geometry enables the clamping piece to be both displaced longitudinally and rotated within the groove, allowing angular adjustment of the contact surface without complex additional mechanisms.
Solution Approach 2:
The T-shaped receiving groove adds a rotational degree of freedom to the conventional linear sliding mechanism. By incorporating the widened inner part that accommodates rotation about an axis perpendicular to the longitudinal axis, the design transforms a one-dimensional sliding adjustment into a two-dimensional adjustment (longitudinal displacement plus rotational adjustment), enabling precise angular alignment of contact surfaces.
2Manufacturing precision
If the contact surfaces are manually aligned, then precise adjustment is achieved, but time-consuming manual rework is required
Solution Approach 1:
The T-shaped receiving groove is pre-formed with the widened inner part that accommodates the rotational movement of the clamping piece. This preliminary geometric preparation eliminates the need for manual alignment operations during assembly, as the clamping piece can be freely rotated to achieve precise angular alignment of contact surfaces directly during the adjustment process.
Solution Approach 2:
The clamping piece is designed to be dynamically adjustable within the T-shaped receiving groove, allowing both longitudinal displacement and rotational movement. This dynamic adjustment capability enables the contact surfaces to be aligned precisely by simply positioning the clamping piece, without requiring static manual rework or additional alignment procedures.
3Stability of the object's composition
If the clamping piece is secured firmly, then adjustment stability is improved, but adjustment flexibility is reduced
Solution Approach 1:
The clamping piece is designed with dynamic adjustability within the T-shaped receiving groove, allowing longitudinal displacement and rotational movement for comprehensive positioning. The threaded pin provides a locking mechanism that secures the clamping piece only after the desired position and angle are achieved, maintaining both adjustment flexibility during positioning and stability after adjustment.
Solution Approach 2:
The adjustment and securing functions are segmented into distinct phases: first, the clamping piece is freely adjustable within the T-shaped groove for positioning; second, the threaded pin is inserted to lock the position. This segmentation allows the system to exhibit both flexibility (during adjustment) and stability (after locking) without compromise.
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
Enables simple and precise adjustment of the hinge action between the breech housing and the tiltable barrel part, ensuring optimal contact pressure and preventing undesired adjustments, thereby enhancing the overall assembly and disassembly process.
Implementation Method 1
the clamping piece has a continuous threaded bore with a threaded pin arranged therein. By screwing in the threaded pin, the clamping piece can be braced against the bearing part and thus secured in a set position.
Implementation Method 2
The adjusting element can be designed as an adjusting eccentric with a cylindrical part that is rotatably guided in the narrower outer part of the receiving groove and an eccentric part that is arranged in the widened inner part of the receiving groove.
Data Source
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AI summary
The invention relates to a break-action firearm with a receiver (1), a barrel section (4) pivotally mounted on the receiver (1) about a pivot axis (3), a forend (2) detachably attached to the barrel section, and a bearing piece (9) arranged at the rear end of the forend (2) as viewed in the firing direction of the break-action firearm. The bearing piece (9) comprises rear bearing surfaces (14) for pivoting against the front mating surfaces (15) of the receiver (1) and a positioning device for adjusting the position of the bearing piece (9) relative to the barrel section (4). The positioning device includes a clamping element (24) slidably guided in the bearing piece (9) in the longitudinal direction of the forend (2) and adjustable by an adjusting element (23) for bearing against a stop (25) arranged on the barrel section (4).