Lock Device Hook Recess Pawl Protrusion Design
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Solution Overview
Problem
The existing lock device is prone to deformation when a strong force is applied to rotate the hook in the unlock-position direction, leading to unintended release of the lock state due to deformation of the protrusion or pawl.
Innovation Solution
A lock device design featuring a hook with an inwardly extending recess and a pawl with a protrusion that intersects the hook's rotation direction, providing high locking strength by restricting rotation with a planar and circular arc interface, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a strong force is applied to rotate the hook in the unlock-position direction, then the hook can be forced to rotate, but the protrusion or pawl becomes deformed causing unintended lock release
Solution Approach 1:
The invention applies local quality by creating a specific geometric configuration where the first face of the hook and second face of the pawl form an abutting interface at a precise location. This localized structural arrangement concentrates the anti-deformation function at the face-to-face contact point, allowing the protrusion and recess to engage while providing localized resistance against rotational deformation forces that would otherwise deform the protrusion or pawl.
Solution Approach 2:
The invention utilizes curved surface geometry where the first face and second face are positioned to abut against each other, creating a planar contact interface that distributes deformation forces. The curved outer peripheral portion of the hook with the recess and the corresponding pawl geometry create a geometric constraint that prevents concentration of stress at single points, reducing the risk of deformation while maintaining engagement capability.
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 enhances locking strength by preventing deformation-induced rotation, ensuring secure engagement and reducing rattle, while maintaining smooth operation and cost-effectiveness.
Implementation Method 1
By a spring 13 having one end locked to the hook 7 and the other end locked to the pawl 11, the hook 7 is biased in an unlock-position direction
Data Source
AI summary
An outer peripheral portion of a hook in a lock device is formed with a recess, which is formed to extend inwardly from a peripheral surface, and a first face, which is formed at a side of a rotation direction toward the unlock position of the hook than the recess and intersects the rotation direction of the hook, and a pawl is formed with a protrusion, which is detachably engaged with the recess of the hook, and a second face, against which the first face of the hook is capable of abutting.