Disc Tumbler Lock Limiter Design for Smooth Key Insertion
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Solution Overview
Problem
Current disc tumbler cylinder locks with rotation limiters are not universally applicable and can be challenging to produce without or with a rotation limiter, as existing solutions often require specific cylinder types and can experience issues with key insertion and wear due to complex mechanisms.
Innovation Solution
A disc tumbler cylinder lock design featuring rotatable limiter disc means composed of a frame piece and a limiter piece, where the limiter piece slides into a bevelled cavity of the key as the key is rotated, allowing smooth key insertion and rotation without non-rotatable parts attached to the inner cylinder, enhancing functional reliability and versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotation limiter with non-rotatable parts attached to the inner cylinder is used, then the key rotation is controlled and the lock becomes more functionally reliable, but the device complexity increases and the ease of manufacture decreases
Solution Approach 1:
The rotation limiter is divided into two separate parts: a frame piece that remains stationary relative to the inner cylinder, and a limiter piece that rotates with the key. This segmentation eliminates the need for non-rotatable parts attached to the inner cylinder, reducing device complexity while maintaining the reliability of key rotation control.
Solution Approach 2:
The limiter piece is extracted as a separate rotatable component from the traditional non-rotatable rotation limiter structure. By taking out the rotating function from the inner cylinder attachment, the design simplifies the overall structure and reduces manufacturing difficulty while preserving the essential function of controlling key rotation.
2Reliability
If a complex rotation limiter mechanism is used, then the key rotation is prevented when not fully inserted, but the ease of manufacture decreases and production becomes more difficult
Solution Approach 1:
By segmenting the rotation limiter into a stationary frame piece and a rotatable limiter piece, the manufacturing process is simplified. Each component can be manufactured independently using simpler processes, avoiding the need to manufacture and assemble complex non-rotatable structures attached to the inner cylinder.
Solution Approach 2:
Instead of attaching non-rotatable parts to the inner cylinder as in traditional designs, the invention inverts the approach by using a rotatable limiter piece that works in conjunction with a stationary frame piece. This inversion simplifies the manufacturing process while achieving the same functional reliability.
3Reliability
If traditional rotation limiters are used, then key insertion control is achieved, but the adaptability to various inner cylinder types is reduced
Solution Approach 1:
The rotation limiter design with a separate frame piece and limiter piece is universally applicable to different types of inner cylinders. The frame piece can be configured to fit various inner cylinder designs, and the limiter piece maintains its rotatable function, providing adaptability across different lock cylinder types while preserving functional 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 ensures smooth key insertion and rotation, reduces wear, and is adaptable to various inner cylinder types, providing improved functional reliability and ease of production by eliminating the need for non-rotatable components, thus addressing the limitations of existing rotation limiters.
Implementation Method 1
the other side 214B of the opening 53 forms a sliding surface, along which the limiter piece is able to slide as the key 11 is rotated from the locked position of the lock
Data Source
Figure 1
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Figure 4~5
AI summary
The rotation limiter disc means (10) of a disc tumbler cylinder lock-key-combination are arranged to be rotated by a key (11), wherein the rotation limiting means have no pieces non-rotatably attached to the inner cylinder (1). The rotation limiter disc means (10) are composed of a frame piece (10B) and a limiter piece (10A). The frame piece (10B) is a circular disc having an opening (53) in the middle of the disc. The opening extends up to the border (52) of the disc widening towards the border, and to the section on the wider side of the opening is disposed a limiter piece (10A). On the inner surface (62) of the inner cylinder (1) is a recess (25) at the site of the limiter disc means (10). The key (11) has at least one bevel-edged cavity (12).