Door Handle Rattling Prevention via Slide Guide Integration

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Solution Overview

Problem

Existing door handle devices experience rattling issues due to gaps between the handle grip and the base member, which are not effectively addressed without modifying the base member's design, leading to increased manufacturing costs.

Innovation Solution

A door handle device design that incorporates a slide guide with a slide contact portion on the handle grip, which is brought into contact with a restricting portion on the base member, preventing rattling without requiring changes to the existing base member, and is integrally formed to reduce part count and manufacturing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a guide member is added to prevent rattling, then rattling is prevented, but manufacturing cost increases due to new mold requirements

Engineering Contradiction:

Improverattling preventionVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The guide member is divided into two functional parts: a guide portion that prevents rattling and a restricting portion that is already present on the base member. This segmentation allows the guide member to be a simpler, cheaper component that can be produced with existing molds, while still achieving the rattling prevention function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The restricting portion on the base member serves dual purposes: it acts as a guide for the inserting portion during normal operation and serves as a positioning reference for the guide member during assembly. This multi-functionality eliminates the need for separate positioning features, reducing manufacturing complexity and cost.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If the base member design is changed to accommodate the guide member, then rattling is prevented, but design flexibility is reduced and existing base members cannot be reused

Engineering Contradiction:

Improverattling preventionVSAvoiddesign flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

Instead of modifying the base member to accommodate the guide member, the invention inverts the approach by designing the guide member to adapt to the existing base member geometry. The restricting portion on the base member is utilized as a positive feature that the guide member conforms to, allowing reuse of existing base members without modification.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The guide member incorporates a restricting portion that is essentially a copy or replication of the base member's restricting geometry. This copying approach ensures compatibility with existing base members while providing the necessary guidance function, eliminating the need for unique base member designs.

Inventive Principle:

Principle #26Copying

3Reliability

If a fixing portion is added to the base member for the guide member, then the guide member is securely fixed, but device complexity increases

Engineering Contradiction:

Improveguide member fixationVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The fixing function is merged with the guiding function by integrating the restricting portion into the guide member structure itself. The same feature that provides guidance also serves as the positioning and fixing reference, eliminating the need for separate fixing portions and reducing overall structural complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The base member's existing restricting portion serves the dual purpose of guiding the inserting portion and positioning the guide member during assembly. This self-service approach means the base member's original geometry is utilized for multiple functions, eliminating the need for additional fixing features and simplifying the overall device structure.

Inventive Principle:

Principle #25Self-service

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 solution effectively prevents rattling of the handle grip while allowing design changes to the handle grip without altering the base member, reducing manufacturing costs and maintaining manipulability.

Implementation Method 1

a slide guide mounted on the handle grip, and having a slide contact portion which is brought into slide contact with the restricting portion

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS10774564B2Door handle device

Publication Date: 2020.09.15 U SHIN LTD

AI summary

Provided is a door handle device which can prevent rattling of a handle grip using an existing base member. A door handle device includes: a base member having a first shaft portion or a first bearing portion formed on one end side thereof, and having a guide hole which has a restricting portion projecting into an inner space formed on the other end side thereof; a handle grip having a second bearing portion which rotatably supports the first shaft portion or a second shaft portion which is rotatably supported by the first bearing portion on one end side thereof, and having an inserting portion advanceable into and retractable from the guide hole formed on the other end side thereof; and a slide guide having a slide contact portion which is brought into slide contact with the restricting portion.