Vehicular Seat Skin Lamination With a Nonbonding Wrinkle Buffer

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Solution Overview

Problem

The existing skin members of vehicular seats face issues with a strange feeling or wrinkles due to differential deformation between adhering and sewing portions, where the leather moves integrally with the base member at the adhering portion but can shift relative to it at the sewing portion, causing uneven force absorption.

Innovation Solution

A skin member piece with a base member and leather laminated together, featuring an adhering portion bonded by an adhering agent, a sewing portion sewn along the outer periphery, and a nonbonding portion between them, allowing for differential deformation absorption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the leather is bonded to the base member at the adhering portion, then the leather moves integrally with the base member, but this causes differential deformation with the sewing portion leading to strange feelings or wrinkles

Engineering Contradiction:

Improveintegral movement of leather with base memberVSAvoidstrange feeling and wrinkles

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent divides the bonding region into distinct segments: an adhering portion where leather is bonded to the base member, a nonbonding portion where they are separated, and a sewing portion where they are sewn together. This segmentation allows each portion to function independently, preventing the differential deformation that causes wrinkles while maintaining integral movement where needed.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The nonbonding portion acts as an intermediary buffer zone between the adhering portion and the sewing portion. This intermediate region absorbs the differential deformation and stress that would otherwise transmit through the entire structure, preventing the harmful effects of strange feelings and wrinkles.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If the leather is sewn to the base member at the sewing portion, then the leather can be joined, but the leather can shift relative to the base member causing differential deformation

Engineering Contradiction:

Improvejoining of leather and base memberVSAvoidrelative shift between leather and base member

Core Design Contradiction:

StrengthVSStability of the object's composition

Solution Approach 1:

The patent separates the joining function (sewing portion) from the integral movement function (adhering portion) by introducing a nonbonding portion between them. This segmentation allows the sewing portion to provide strong joining while the nonbonding portion prevents relative shift by absorbing differential deformation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the leather-base member assembly have different bonding characteristics: the adhering portion has strong bonding for integral movement, the nonbonding portion has no bonding to allow relative movement, and the sewing portion has mechanical bonding for joining. This local differentiation of bonding quality resolves the contradiction between strength and stability.

Inventive Principle:

Principle #3Local quality

3Device complexity

If the adhering portion and sewing portion are simply contiguous to each other, then the structure is simple, but this causes a strange feeling or wrinkles due to different deformation methods

Engineering Contradiction:

Improvestructure simplicityVSAvoidstrange feeling and wrinkles

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a nonbonding portion that segments the structure between the adhering portion and sewing portion. While this adds a structural element, it prevents the harmful effects of wrinkles and strange feelings, achieving a balance between complexity and performance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The nonbonding portion converts the potentially harmful differential deformation into a beneficial stress-absorbing mechanism. By allowing controlled relative movement in the nonbonding portion, the structure absorbs stresses that would otherwise cause wrinkles, turning a potential weakness into a strength.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 nonbonding portion alleviates the difference in deformation between adhering and sewing portions, reducing the likelihood of a strange feeling or wrinkles when seated, while also simplifying the manufacturing process and preventing leather stretching or wrinkling.

Implementation Method 1

an adhering portion bonded by an adhering agent in layers

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS7823980B2Pieces for skin members of vehicular seats and methods of manufacturing the same

Publication Date: 2010.11.02 TOYOTA BOSHOKU KK

AI summary

A piece for a skin member of a vehicular seat has a base member and a leather laminated to the base member. The base member has a cushion having elastic properties and a base cloth adhered to the cushion. The base member and the leather include an adhering portion bonded by an adhering agent, a sewing portion formed by being sewn at outer peripheral portions of the base member and the leather, and a nonbonding portion in which the base member and the leather are not bonded between the adhering portion and the sewing portion.