Fold Rear-View Mirror Shaft Safety Mechanism
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Solution Overview
Problem
Existing rear-view mirror assemblies for motor vehicles face safety risks due to potential violent release of the shaft and spring when abutment projections break or the bayonet connection fails, leading to damage to persons and assembly parts, with current safety measures slowing down production and increasing costs.
Innovation Solution
A fold rear-view mirror assembly with a detent mechanism and safety stop portions that prevent the shaft from being released from the shaft housing, using a compression spring and bayonet-type safety means to absorb impact energy in case of failure, allowing safe rotational fastening and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a compression spring and bayonet connection are used to retain the shaft in the mirror housing, then the mirror housing can be rotated between operative and folded positions, but the shaft and spring may be violently released if abutment projections break or connection fails, causing damage to persons and assembly parts
Solution Approach 1:
The patent applies beforehand cushioning by providing a dedicated reception space within the mirror housing that can accommodate the shaft and spring when they are violently released. This reception space acts as a pre-prepared safety mechanism that cushions the impact and contains the released components, preventing them from causing damage to persons or other assembly parts. The reception space is specifically designed to receive the shaft in case of connection failure, thereby neutralizing the harmful effects before they can propagate.
Solution Approach 2:
The patent introduces an intermediary element in the form of a reception space that mediates between the potentially harmful released shaft/spring and the surrounding assembly. This reception space serves as a buffer zone that intercepts the violently released components, allowing them to be contained safely within the housing rather than being projected outward. The reception space thus acts as a protective intermediary that transforms a potentially dangerous failure mode into a contained event.
2Object-affected harmful factors
If physical barriers and protection masks are implemented to prevent violent release damage, then safety of operators is ensured, but production rates are slowed down and production costs increase
Solution Approach 1:
The patent extracts the safety function from external protective measures (physical barriers and protection masks) and integrates it directly into the assembly itself through the reception space. By building the safety mechanism into the product design, the need for external protective equipment during assembly is eliminated. This allows operators to work without masks or barriers, thereby maintaining safety while preserving production rates and reducing costs.
Solution Approach 2:
The patent applies self-service by designing the mirror housing to inherently protect against its own potential failure modes. The reception space is an integral part of the housing that automatically contains released components without requiring any external protective systems or additional safety equipment. The assembly essentially protects itself against the consequences of its own potential failures, eliminating the need for external safety interventions that would slow down production.
3Object-affected harmful factors
If shaft retaining means are provided to prevent violent release, then safety is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the reception space to serve multiple functions: it acts as both the housing for the mirror assembly and a safety containment zone for potential failures. This multi-functional design integrates the safety feature into the existing structure without adding separate dedicated safety components. The reception space thus performs dual roles - structural housing and safety containment - thereby improving safety without proportionally increasing device complexity.
Solution Approach 2:
The patent merges the safety function with the existing mirror housing structure by integrating the reception space into the housing design. Instead of adding a separate safety mechanism, the housing itself is designed to contain released components. This merging of functions combines the structural role of the housing with the safety role of containing failed components, thereby achieving safety improvement with minimal increase in overall device complexity.
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 ensures safe operation by preventing the shaft from being released violently, reducing the risk of injury and damage, while allowing for efficient assembly and maintenance by absorbing impact energy, thus enhancing safety and production efficiency.
Implementation Method 1
A compression spring is provided surrounding the shaft such that the compression spring is compressed between the mirror housing and the base member
Data Source
Figure 1
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AI summary
The present fold rear-view mirror assembly (100) comprises a fixed base member (120), a mirror housing (130) that can be rotated relative to the base member (120), a shaft (140), an elastic element (160) for applying a force on the base member (120) and the mirror housing (130) through the shaft (140), shaft axially retaining means (200), and safety means for preventing the shaft (140) from being released comprising a first and second stop portions (310, 320) formed in the mirror housing (130) and the shaft (140) respectively and arranged such that in different shaft angular positions the first and the second stop portions (310, 320) do not interfere with one another such that the shaft (140) can be inserted in the shaft housing (130), or the first and second stop portions (310, 320) interfere with one another preventing the shaft (140) from being released from the shaft housing (130) by the action of the elastic element (160) in case of failure of the shaft retaining means (200).