Rotary Lock Key With Tapered Cross Section And Movable Control Element
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Solution Overview
Problem
Existing rotary locking systems lack sufficient security against manipulation and copying, with a need for enhanced query security and increased locking permutations.
Innovation Solution
A key with a tapered cross section and a control element that includes a bolt and spring mechanism, allowing for additional query elements and increased design freedom, which enhances security by requiring multiple interactions for proper alignment and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a standard cylindrical key shaft is used, then the structure is simple and manufacturing is easy, but the design freedom for tumblers is limited and additional query elements cannot be accommodated
Solution Approach 1:
The key shaft features a localized tapered cross-section in the area of the control element, while maintaining a cylindrical cross-section in other areas. This local modification provides the necessary design freedom for the tumbler interaction without unnecessarily complicating the overall key shaft structure
Solution Approach 2:
The invention introduces a dimensional change by transitioning from a uniform cylindrical cross-section to a tapered cross-section. This dimensional variation creates additional spatial freedom for positioning and designing the tumbler and control element interaction, enabling more complex security mechanisms
2Ease of operation
If the control surface is located on the outside of the tapered cross section, then the key is more compact, but the contact with the tumbler cannot force a second query
Solution Approach 1:
The control element is designed to be movable within the key shaft, allowing it to protrude and make contact with the tumbler. This dynamic positioning enables the control surface to be spaced from the outside of the tapered cross section while still effectively interacting with the tumbler to force a second query, thereby enhancing security without compromising compactness
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 significantly increases the security of the rotary locking system by requiring multiple interactions and additional query elements, making it more resistant to manipulation and copying, while also increasing the number of locking permutations for enhanced protection.
Implementation Method 1
The control element comprises a bolt and spring element arranged in a hole in the key, in particular a compression spring, which spring element applies a force to the bolt which pushes the control element outwards as seen from the key shaft
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A key (1) for a rotary lock cylinder (2) comprises a key handle (3) and a key shaft (4) adjoining the key handle (3), which extends along a longitudinal axis (L), wherein the key shaft (4) has on its outer side (5) control recesses (10), in particular control bores, for engaging tumblers on the rotary lock cylinder (2) and at least one control element (6) movably arranged in the key shaft (4), which control element (6) has a control surface (8) that cooperates with a tumbler (7) of the rotary lock cylinder (2). The key is further characterized in that the key shaft (4) has a tapered cross-section (9) in the area of the control element (6), which is tapered compared to the cross-section (11) with the control recesses (10).