Seat Backrest Lumbar Curving Element With Anti-Rattle Pretension
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Solution Overview
Problem
Backrest structures for motor vehicle seats often experience rattling noises due to the marginal relative movement of the curving element with respect to the support structure when unloaded, as the curving element is not maintained in constant contact with the support structure, leading to ineffective noise reduction.
Innovation Solution
A connecting element is introduced to apply a pre-tensioning force between the curving element and the support structure, ensuring direct contact and minimizing rattling noises without relying on the backrest cushion, using elastic or resilient ends that return to their initial position to maintain contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the curving element is simply clipped or plugged to the support structure, then the mounting is easy and simple, but rattling noises occur due to marginal relative movement when the seat is unloaded
Solution Approach 1:
The connecting element applies a pre-tensioning force to the curving element before the seat is occupied, maintaining initial contact pressure between the curving element and support structure. This preliminary action prevents the curving element from separating and rattling against the support structure during subsequent use, thereby eliminating noise without complicating the mounting process
Solution Approach 2:
The connecting element is pre-installed and pre-tensioned during assembly to establish continuous contact between the curving element and support structure. This preliminary positioning ensures that the curving element remains in constant contact during both loaded and unloaded states, preventing rattling noises while maintaining simple clipping or plugging mounting
2Object-affected harmful factors
If additional sound dampeners are provided to avoid rattling noises, then noise is reduced, but the device complexity increases
Solution Approach 1:
The invention extracts and eliminates the need for separate sound dampeners (felt pads, tape, wire flock) by integrating the noise prevention function into the connecting element itself. The connecting element's pre-tensioning capability directly prevents rattling noises, thereby reducing device complexity while maintaining noise reduction effectiveness
Solution Approach 2:
The connecting element serves multiple functions simultaneously: it secures the curving element to the support structure, applies pre-tensioning force to maintain contact, and prevents rattling noises. This multi-functionality eliminates the need for separate sound dampeners, thereby reducing device complexity while achieving noise reduction
3Stability of the object's composition
If the pre-load on the curving element is increased via the backrest cushion, then contact is maintained, but the cushion deforms or compresses over time making the solution ineffective
Solution Approach 1:
The connecting element acts as an intermediary component that applies pre-tensioning force to the curving element independently of the backrest cushion. This mediator maintains contact between the curving element and support structure without relying on the cushion's compressive force, thereby ensuring long-term reliability and preventing cushion deformation issues
Solution Approach 2:
The connecting element is designed to automatically maintain pre-tensioning force and contact pressure between the curving element and support structure throughout its service life. This self-service mechanism ensures consistent contact maintenance without degradation over time, unlike cushion-based solutions that deform and lose effectiveness
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 connecting element effectively prevents rattling noises by maintaining the curving element in constant contact with the support structure, even when the seat is unloaded, enhancing the structural configuration and reducing assembly complexity.
Implementation Method 1
The at least one connecting element thus pushes or pulls the curving element towards the support structure so that the curving element, which is (already) secured to the support structure, is held in direct contact with the support structure
Data Source
AI summary
A backrest structure for a seat comprising a backrest frame which has a support structure and a front side facing the back of a seat user, a backrest cushion at the backrest frame a lumbar support mounted on the front side of the backrest frame for supporting the back of a seat user, an adjusting device for adjusting the position of the lumbar support perpendicular to the extension plane of the backrest frame and a curving element arranged on the front side of the backrest frame between the lumbar support and the backrest cushion. The curving element is secured to the support structure and the adjusting device acts on the curving element in order to adjust a curvature of the curving element. Furthermore, the backrest structure comprises at least one connecting element being connected to the curving element and the support structure, which connecting element applies a pre-tensioning force to the curving element in order to maintain the curving element in contact with the support structure.