Webbing Length Adjustment Device with Lateral Pressing Plate
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Solution Overview
Problem
Conventional webbing length adjustment devices for seat belt systems are inconvenient to operate, lack clear points of application, and have fragile components that can easily break, leading to uncomfortable user experiences and operational inefficiencies.
Innovation Solution
A webbing length adjustment device featuring an outer shell with a longitudinal groove and an adjustment assembly that includes an operating member with a lateral pressing plate portion and a sliding member, along with an elastic member, allowing for easy force application and operation without interference, while the outer shell provides protection and a larger surface area for gripping, reducing the risk of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the adjustment base is formed by a bent metal plate, then the structure is simple and strong, but the areas held by the user are small and it is hard to provide point of application
Solution Approach 1:
The adjustment base is segmented into a rigid base body and a separate operating member with a pressing portion. The operating member acts as an extension that provides a larger surface area for user contact, while the base body maintains structural strength. This segmentation allows the weak point (contact area) to be separated from the strong point (structural core).
Solution Approach 2:
The operating member serves as an intermediary between the user's hand and the internal adjustment mechanism. It transmits force from the user to the moving element while providing ergonomic contact surfaces. The pressing portion on the operating member acts as a mediator that converts user pressure into mechanical movement of the adjustment mechanism.
2Strength
If the adjustment base and moving element are rigid metallic members, then the structure is strong and durable, but they can directly contact the user's body generating uncomfortable feel
Solution Approach 1:
Different parts of the device have different material properties tailored to their functions. The internal structure uses rigid metal for strength, while the user-contact surfaces use soft, cushioned materials for comfort. This local differentiation of material quality allows the device to simultaneously achieve structural integrity and user comfort without compromising either aspect.
3Reliability
If the adjustment base and moving element are made of metallic materials, then the structure is strong, but the device can directly contact the user's body generating uncomfortable feel
Solution Approach 1:
The device employs local quality differentiation where rigid metallic components provide structural reliability internally, while soft cushioned materials are applied specifically at user contact points. This localized material selection ensures that reliability is maintained where structural strength is needed, while comfort is provided where user contact occurs.
4Adaptability or versatility
If the operating member is pressed to adjust webbing length, then the adjustment function is achieved, but the existing structure lacks clear points of application making operation inconvenient
Solution Approach 1:
The operating member is segmented into distinct functional zones: a pressing portion for user contact, a connecting portion for mechanical linkage, and engagement features for the webbing. This segmentation creates clear, intuitive points of application that guide user interaction and improve operational ease while maintaining the adjustment function.
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 device enables convenient operation with clear points of application, reduces user discomfort, and enhances durability by providing a robust structure that is less prone to damage, making it easier to adjust webbing lengths effectively.
Implementation Method 1
an elastic member (30), disposed in the longitudinal groove (12) and located between the bottom plate (13) and the operating member (21), for giving a restoring force to the operating member (21)
Data Source
AI summary
A webbing length adjustment device has an outer shell, an adjustment assembly, and an elastic member. The adjustment assembly is disposed in and is moveable relative to the outer shell, and has an operating member having a lateral pressing plate portion and a sliding member moving relative to the operating member. The lateral pressing plate portion is formed on the operating member, is located above the outer shell, and is located beside the second through hole for giving more areas to exert force easily and operate conveniently. The lateral pressing plate portion is located at an outer side of a first webbing. There is no interference between the first webbing and user's hand. The elastic member is disposed in the outer shell, and is connected to the outer shell and the operating member for giving a restoring force to the operating member. The outer shell is hard to damage.