Elliptical Cable End Passage for Movable Member Detachment Prevention

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Solution Overview

Problem

Existing cable connection structures for movable members, such as door handle devices in vehicles, face issues with detachment of the inner cable due to increased sliding resistance and buckling distortion, leading to a failure in transmitting operating forces.

Innovation Solution

A cable connection structure featuring a pair of wing pieces with a cable introduction opening and elliptical cable end passing parts, where the inner wire is inserted between the wing pieces and rotated around the cable end, preventing detachment by restricting movement and absorbing buckling distortion within a culvert-shaped portion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the inner wire is inserted through the notch and locked by the locking part, then the detachment of the inner wire from the movable member is prevented, but the inner wire is subjected to buckling distortion under compressive force when sliding resistance increases during return stroke

Engineering Contradiction:

Improveprevention of inner wire detachmentVSAvoidinner wire buckling distortion

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The movable member is divided into two functional components: a locking part that prevents detachment and a pair of wing pieces that accommodate buckling. This segmentation allows each component to address a specific problem - the locking part secures the inner wire while the wing pieces provide space for buckling distortion without causing detachment

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The inner wire is nested between the pair of wing pieces, which are themselves part of the movable member structure. This nested configuration allows the inner wire to be constrained laterally by the wing pieces, providing a stable path that prevents buckling-induced detachment while maintaining the locking mechanism's security function

Inventive Principle:

Principle #7Nested doll (Nesting)

2Reliability

If the inner wire is difficult to follow the movable member due to increased sliding resistance, then the inner wire may buckle under compressive force, but restricting the inner wire movement completely may increase sliding resistance further

Engineering Contradiction:

Improveoperating force transmissionVSAvoidinner wire sliding resistance

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The wing pieces provide localized lateral constraint at critical positions where buckling would occur, rather than completely restricting the inner wire's movement. This local quality approach allows the inner wire to slide freely along its intended path while providing structural support only where needed to prevent buckling

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The pair of wing pieces act as intermediary structures between the inner wire and the movable member's motion. They mediate the interaction by providing a guided path that reduces unwanted lateral movement and buckling while maintaining low sliding resistance for the intended sliding motion

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10030691B2Cable connection structure for movable member

Publication Date: 2018.07.24 ALPHA

AI summary

In a cable connection structure in which a roughly spherical cable end disposed at the tip of an inner wire is connected to a movable member, the movable member is provided with a pair of wing pieces that hold the inner wire, a cable insertion opening that guides the cable end to a space between the wing pieces, and a roughly elliptical cable end passage part that displaceably supports the cable end. The long axis of the roughly elliptical shape of the cable end passage part roughly coincides with the direction of insertion of the cable.