Handle Device Anti-Removal Guide Element Mechanism
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Solution Overview
Problem
Existing handle arrangements for locks and windows are insecure as the handle can be easily removed, compromising access to the lock and electronics, especially in electronically lockable systems, leading to security concerns and increased complexity with additional safety devices.
Innovation Solution
A guide element is used to secure the handle on the shaft, engaging in a depression that runs along the shaft's longitudinal direction, making the handle non-removable without destruction, and a positioning element fixes the handle axially, allowing for adjustment to different thicknesses while preventing easy removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle is secured to the shaft using a grub screw that is accessible from the outside, then the handle can be easily removed for assembly and disassembly, but the security of the lock is compromised as the handle can be easily pulled off
Solution Approach 1:
The patent introduces a guide element as an intermediary component between the handle and the shaft. This guide element has a guide portion that engages with a corresponding guide recess in the shaft, creating a mechanical interference fit that prevents the handle from being pulled off. The grub screw is retained for assembly purposes but its function is supplemented by the guide element's anti-removal mechanism, thus maintaining ease of assembly while improving security.
2Reliability
If additional safety devices such as sleeves and washers are added to prevent handle removal, then the security of the lock is improved, but the structure becomes more complex and expensive
Solution Approach 1:
The patent merges the guide function and the anti-removal function into a single integrated guide element. Instead of using separate safety devices like sleeves and washers, the guide element combines the grub screw with a guide portion that directly engages the shaft's guide recess. This integration simplifies the structure while maintaining security, as the guide element itself provides the anti-removal mechanism through geometric interference rather than requiring additional components.
Data Source
Figure 1~2
Figure 3~4
AI summary
The arrangement (1) has a handle (2) e.g. knob, connected with a shaft (3), which is in effective connection with a lock, in a torsionally-stiff and detach-secure manner. The shaft has a groove-like slot (11) running in a longitudinal direction (10) of the shaft. The handle includes a guide element (12) that is engaged in the slot in a final assembled condition. The shaft has a set of blind holes (15) that are arranged next to each other in the longitudinal direction. A positioning element e.g. set screw, of the handle is engaged into the blind holes.