Vehicle Seat Backrest Bracket for Leg Space Preservation
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Solution Overview
Problem
Vehicle seats in rail vehicles face challenges in providing adjustable backrest inclination without disturbing the leg space of passengers behind, and existing solutions are often complex and costly.
Innovation Solution
A vehicle seat design featuring a bracket-like element pivotally mounted on the base frame, allowing the backrest cushion to pivot forward, maintaining unchanged base frame inclination and thus not impairing rear passenger space, with driver elements facilitating the pivoting movement for adjustable backrest inclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the backrest is tilted rearward to provide comfortable backrest inclination adjustment, then seating comfort is improved, but the leg space of the person sitting behind is reduced
Solution Approach 1:
The backrest is divided into two independent parts: the base frame (which remains fixed) and the backrest cushion surface portion (which can be tilted independently). This segmentation allows the cushion to be adjusted for comfort while the base frame maintains the original position, preserving leg space for the person behind.
Solution Approach 2:
The tilting function is extracted from the base frame and assigned to the backrest cushion surface portion only. The bracket-like element is used to tilt the cushion away from the base frame, separating the adjustment function from the structural frame that determines leg space.
2Ease of operation
If a complex mechanism with lever arms and plates is used to achieve lumbar support and backrest adjustment, then backrest inclination adjustment is achieved, but device complexity and cost increase
Solution Approach 1:
Instead of using a complex overall mechanism, the patent applies a simple bracket-like element locally at the lower half of the backrest cushion. This localized approach provides the necessary adjustment function without requiring complex mechanisms throughout the entire backrest structure.
Solution Approach 2:
The bracket-like element is a simple, cost-effective component that can be easily manufactured and replaced if needed. It replaces expensive, complex mechanisms with a straightforward structural solution that achieves the same functional result.
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
Enables comfortable backrest adjustment with increased support for the spine, maintaining leg space for passengers behind and reducing overall costs through a simplified mechanism.
Implementation Method 1
a bracket-like element (8) which extends upwards in the middle area, is pivotally mounted in its end areas (8a, 8b) on the base frame (1) in its lower area about a substantially horizontally aligned pivot axis
Implementation Method 2
If the bracket-like element is curved, for example, i.e. in an upward curve with a maximum in the central area, or for example trapezoidal with a maximum area also in the central area of the bracket-like element, pivoting the bracket-like element can not only result in a deformation of the backrest cushion surface portion in the forward direction, but also a deformation of the backrest cushion surface portion can be achieved in its lower region in the width direction
Data Source
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AI summary
The vehicle seat has a seat portion (2) that is provided with a seat cushion surface portion (4). The backrest cushion surface portions (5,5a) of a backrest (3) are formed on a base frame (1). The lower portion (1a) of the base frame is attached with a bow-like element (8) with two end regions (8a,8b) and a central portion (8c). A seat unit (9) is arranged in the longitudinal direction of the base frame. The backrest cushion surface portion in the lower region (6b) is lifted by the pivoting movement in the forward direction of seat portion.