Knob Device Snap-Fit Assembly for Structural Stability

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Solution Overview

Problem

Conventional knob devices face challenges in achieving high regulation accuracy and durability due to structural deformation caused by excessive screw locking forces, which affects the rotating hand-feeling and assembly complexity.

Innovation Solution

A knob device design featuring a lower and upper cover assembly, a limiting member, and an annular member with retractable pogo pins that replace screw locking, allowing for stable and accurate rotation by limiting structural deformation and improving assembly ease.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If screw locking manner is used to fix components, then structural stability is improved, but structural deformation and interference with another component occur due to excessively strong locking force

Engineering Contradiction:

Improvestructural stabilityVSAvoiddimensional accuracy

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

The patent replaces the traditional screw locking mechanism with a snap-fit structure consisting of a limiting member with a limiting groove and a corresponding limiting protrusion on the upper cover assembly. This mechanical substitution eliminates the need for screws and screw locking forces, thereby preventing structural deformation and dimensional inaccuracy while maintaining stable component fixation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Stability of the object's composition

If screw locking manner is used to fix components, then structural stability is improved, but rotating hand-feeling is affected due to torsion during fixation

Engineering Contradiction:

Improvestructural stabilityVSAvoidrotating hand-feeling

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The snap-fit structure between the limiting member and upper cover assembly eliminates screw locking forces that cause torsion during fixation. This allows the knob assembly to rotate smoothly without interference, providing good rotating hand-feeling while maintaining structural stability through the limiting groove and protrusion mechanism.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Stability of the object's composition

If complex assembling and disassembling structure is used, then mounting stability is improved, but durability is affected

Engineering Contradiction:

Improvemounting stabilityVSAvoiddurability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent divides the fixing mechanism into segmented components: a limiting member with a limiting groove and an upper cover assembly with a limiting protrusion. This segmentation allows for simple assembly and disassembly operations while maintaining mounting stability, thereby improving durability by reducing assembly complexity and potential errors.

Inventive Principle:

Principle #1Segmentation

4Manufacturing precision

If pogo pins are used instead of screw locking, then probability of structural deformation is reduced, but manufacturing complexity increases

Engineering Contradiction:

Improvedimensional accuracyVSAvoidassembly structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent replaces screw locking with a snap-fit structure using limiting members and protrusions, which is simpler than pogo pins. This substitution maintains dimensional accuracy by preventing structural deformation while reducing assembly structure complexity, as the snap-fit mechanism requires fewer components and simpler assembly steps compared to pogo pin systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 design enhances mounting stability, reduces torsion, and ensures smooth rotation, improving the rotating hand-feeling while reducing the risk of structural deformation and assembly interference.

Implementation Method 1

The annular member includes multiple pogo pins retractably protruding from an outer surface

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS10698436B1Knob device

Publication Date: 2020.06.30 PEGATRON

AI summary

A knob device includes a lower cover assembly, an upper cover assembly, a limiting member and an annular member. The lower cover assembly includes a first stopping portion. The upper cover assembly is rotatably stacked on the lower cover assembly along an axis. The upper cover assembly has multiple fixing holes. The limiting member is located between the upper cover assembly and the lower cover assembly and fixed to the lower cover assembly. The limiting member includes a body and a second stopping portion extending from the body. The second stopping portion and first stopping portion are arranged up and down along the axis. The annular member is arranged around the body, and the annular member is rotatably arranged between the first stopping portion of the lower cover assembly and the second stopping portion. The first stopping portion and the second stopping portion limit the annular member on the axis. The annular member includes multiple pogo pins retractably protruding from an outer surface. The pogo pins extend into the fixing holes of the upper cover assembly to fix the annular member to the upper cover assembly.