Knob Assembly Hook Locking Mechanism for Precision Housing

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Solution Overview

Problem

Conventional knob assemblies with disassemblable housings suffer from low precision, ease of deformation, and assembly issues due to torsion, making them difficult to assemble and operate effectively.

Innovation Solution

A knob assembly design featuring a lower housing with hook structures and an upper housing with an annular hook groove, secured by a pushing member and screw member, allowing for easy assembly and disassembly while maintaining high precision and reducing the risk of deformation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional disassemblable housing designs are used, then assembly and disassembly are possible, but manufacturing precision is low and deformation occurs due to torsion

Engineering Contradiction:

Improveassembly easeVSAvoidhousing precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The housing is divided into upper and lower sections with distinct functional features. The lower housing contains hook structures while the upper housing has an annular hook groove, creating segmented components that assemble through mechanical interlocking rather than traditional fastening methods

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The pushing member is nested within the lower housing and works in conjunction with the hook structures. When the screw member is tightened, the pushing member moves axially to push the hook structures outward, creating a nested assembly mechanism that ensures precise positioning and prevents deformation

Inventive Principle:

Principle #7Nested doll (Nesting)

2Strength

If conventional housing connection methods are used, then housings can be joined, but torsion causes deformation and assembly difficulty

Engineering Contradiction:

Improvehousing connection strengthVSAvoidassembly ease

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The hook structures are pre-formed in the lower housing and the annular hook groove is pre-formed in the upper housing. The pushing member is pre-positioned to engage with the hook structures. When assembled, these pre-formed features work together to automatically prevent torsion and deformation without requiring additional adjustment or complex assembly operations

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The pushing member acts as an intermediary between the screw member and the hook structures. It translates the axial force from the screw member into radial force that pushes the hook structures against the annular hook groove, creating a secure connection that resists torsion while maintaining ease of assembly

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10854402B2Knob assembly and shuttle structure having knob assembly

Publication Date: 2020.12.01 PEGATRON

AI summary

A knob assembly includes a lower housing, a pushing member, an upper housing, and a screw member. The lower housing includes a tank and hook structures. A through via is formed at the center of the lower housing. The upper housing is rotatably stacked on the lower housing. A lower surface of the upper housing includes an annular hook groove. The pushing member is disposed between the upper and the lower housing, and includes a body and pushing structures. A screw hole is formed at the center of the body. When the screw member is screwed into the screw hole through the through via, the pushing member moves toward and locks the lower housing, and the pushing structures push the hook structures to cause the hook structures to expand outward and be hooked to the annular hook groove, so that the upper housing is limited by the lower housing.