Vehicle Body Fastener With Assembly State Indicator Feedback
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Solution Overview
Problem
Existing fastening elements for vehicle body parts lack a reliable method to verify secure and correct assembly, making it difficult to ensure proper positioning and fixation, which is critical for safety applications like airbag systems.
Innovation Solution
Incorporating an indicator element that provides acoustic and visual feedback during assembly, allowing the fastening element to signal its secure installation through a snap connection with the vehicle body part, which can be either destructively or regeneratively formed, and is designed to protrude radially from the fastening element to indicate correct positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fastening elements are used without indicator elements, then the assembly process is simpler and the device structure is less complex, but the ability to verify secure and correct assembly is insufficient
Solution Approach 1:
The patent applies feedback by incorporating indicator elements that provide visual and acoustic signals during assembly. The indicator element includes a visible portion that changes position or appearance and an acoustic portion that generates audible clicks or snaps, giving real-time feedback to the operator about the assembly state. This resolves the contradiction by enabling reliable assembly verification while keeping the overall system relatively simple through straightforward mechanical indicator mechanisms.
Solution Approach 2:
The patent utilizes color changes as part of the visual indication mechanism. The indicator element incorporates colored portions that may change appearance, position, or visibility based on the assembly state. For example, a colored ring or marker may move from a hidden to visible position, or change color intensity, providing intuitive visual feedback about whether the fastening element is correctly assembled. This principle enhances reliability through easily observable visual cues without significantly complicating the device structure.
2Measurement precision
If indicator elements are added to provide assembly feedback, then the assembly verification capability is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the indicator elements with the fastening element structure itself rather than using separate independent components. The indicator portions are integrated into the body, shaft, or locking mechanisms of the fastening element, allowing them to be manufactured as a single piece or pre-assembled unit. This integration reduces the number of separate parts, simplifies manufacturing processes, and lowers assembly complexity while still providing precise assembly state detection through the combined structure.
Solution Approach 2:
The indicator elements are designed to automatically indicate assembly state without requiring external monitoring devices or complex sensing systems. The mechanical structure itself provides the indication through inherent movements, position changes, or acoustic emissions during assembly. This self-service approach enables precise assembly state detection using simple, cost-effective mechanical indicators rather than expensive electronic sensors or external measurement equipment.
3Loss of information
If the indicator element is designed to protrude radially and provide acoustic feedback, then the assembly state signaling is more immediate and reliable, but the device complexity and potential interference with surrounding components increases
Solution Approach 1:
The patent employs mechanical vibration and acoustic emission as part of the feedback mechanism. The indicator element incorporates portions that generate audible clicks, snaps, or vibrations when transitioning between assembly states. This mechanical acoustic feedback provides immediate and unambiguous information about assembly completion without requiring complex electronic sensors or signal processing systems. The acoustic feedback is generated naturally by the mechanical interaction of the fastening element with the workpiece, resolving the contradiction through simple yet effective acoustic signaling.
4Reliability
If multiple indicator elements are provided for comprehensive assembly verification, then the measurement precision and reliability improve, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent designs indicator elements that serve multiple functions simultaneously. Each indicator element may provide both visual indication and acoustic feedback, or indicate multiple different assembly states through a single integrated mechanism. This multi-functionality reduces the total number of separate indicator components needed while maintaining comprehensive assembly verification capability. The universal indicator elements can indicate various aspects of assembly status (positioning, engagement, locking) through different modes of the same basic indicator mechanism.
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 indicator element simplifies the assembly process by providing immediate feedback on the assembly state, ensuring the fastening element is correctly positioned and securely installed, enhancing the reliability of the assembly process, especially in safety-critical applications.
Implementation Method 1
the shaft region of the fastening element supports at least one spring element which, upon insertion into an opening of a body, is temporarily deformed and subsequently reaches with a latching shoulder or the like under the boundary or the edge region of the opening
Implementation Method 2
The flange region is generally shaped conically in order to apply a spring force
Implementation Method 3
the at least one indicator element of the fastening element is designed for acoustically and/or visually signaling an assembly state of the fastening element
Data Source
AI summary
A fastening element (1) for insertion into an opening (50) of a part (51), in particular a vehicle body part, wherein the fastening element (1) has a head region (2), a flange region (3), which is connected to the head region (2) via a first shaft region (4), and a second shaft region (5), which continues from the flange region (3) on the side opposite the head region (2) and is formed such that, in the inserted state of the fastening element (1) in the opening (50), it extends through the opening (50), at least in certain regions, and forms a snap connection with the part (51), in particular vehicle body part, wherein at least one indicator element (6) is associated with the fastening element (1) for, in particular, acoustically and/or visually signaling an assembly state of the fastening element (1).