Anti-Theft Rim Screw With Wavy Spring Ring and Mounting Bevel
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Solution Overview
Problem
Existing screw parts for motor vehicle rims are difficult to assemble securely and can be easily removed, lacking a practical non-destructive mechanism to prevent unauthorized removal of the ring body from the head.
Innovation Solution
A corrugated spring ring with inner and outer grooves, a circumferential mounting bevel, and a design where the spring ring is pressed into the groove during assembly, ensuring secure engagement and preventing removal without destruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ring body is easily removable from the head, then assembly and disassembly are simple, but security against unauthorized removal is compromised
Solution Approach 1:
The spring ring is divided into two functional zones: an inner groove for easy engagement during assembly and an outer groove for secure locking after assembly. This segmentation allows the same component to provide both ease of assembly and security against unauthorized removal.
Solution Approach 2:
The mounting bevel performs a preliminary action by guiding and pressing the spring ring into the inner groove during assembly. This preliminary positioning ensures the spring ring is correctly seated before the final locking engagement with the outer groove, facilitating easy assembly while preparing for secure locking.
2Ease of operation
If the spring ring groove is shallow, then assembly is easier, but secure engagement of the spring ring cannot be achieved
Solution Approach 1:
The groove system is segmented into two distinct grooves at different depths and positions. The inner groove provides shallow engagement for easy assembly, while the outer groove provides deep engagement for secure locking. This resolves the contradiction by distributing the functional requirements across separate structural elements.
Solution Approach 2:
The mounting bevel acts as an intermediary element that facilitates the transition from the easy-to-assemble inner groove configuration to the securely locked outer groove configuration. It guides the spring ring into proper position and applies the necessary force for secure engagement without requiring excessive assembly force.
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 allows for easy assembly and secure attachment of the ring body to the head, preventing unauthorized removal by creating a frictional engagement that is difficult to reverse without damaging components.
Implementation Method 1
The mounting bevel comes into contact with the spring ring and, as the axial movement continues, increasingly presses it into the groove in which it is already located
Data Source
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AI summary
The invention relates to a screw portion for theft-protected fastening of a rim of a motor vehicle comprising a) a head (20) comprising an encrypted drive surface (22) for introduction of a torque, b) an annular body (36) surrounding the head (20) and having an outer surface, wherein an inner notch (40) is provided in the annular body (36) and an opposite outer notch (30) is provided in the head (20) and c) a non-circular spring washer (42) that is disposed between the head (20) and the annular body (36), engages with the inner notch (40) and the outer notch (30) and comprises outer areas (44) that engage with the inner notch (40). It is characterized in that the spring washer (42) is wavy and comprises inner areas (46), that the inner areas (46) engage in the outer notch (30), that a peripheral mounting bevel (38) is provided at the annular body (36) and/or at the head (20), and that the mounting bevel (38) is located in front of the respective notch (30, 40) in the mounting direction.