Threadless Lens Cover Fit for Lighting Fixture Assembly

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Solution Overview

Problem

Existing lighting fixtures with screw fits between lens covers and housings face issues such as time-consuming installation and removal, risk of damage during installation, and deformation of screws under harsh conditions, leading to poor heat dissipation and light distribution.

Innovation Solution

A lighting fixture design that employs a threadless fit, specifically an interference fit or snap fit, between the lens cover and the housing, using tabs and slots to secure the lens cover without screws, thereby simplifying assembly and enhancing durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If screw fit is used between lens cover and housing, then connection strength is improved, but installation time increases and risk of damage occurs

Engineering Contradiction:

Improveconnection strengthVSAvoidinstallation time

Core Design Contradiction:

StrengthVSLoss of time

Solution Approach 1:

The patent removes the screw fastening mechanism from the lens cover assembly, extracting the time-consuming installation step while maintaining connection strength through an integrated mounting design where the lens cover directly engages with the housing without separate fasteners

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The lens cover is merged with the mounting structure, combining the cover function and fastening function into a single integrated component that attaches to the housing as one unit, eliminating the need for separate screw installation

Inventive Principle:

Principle #5Merging (Combining)

2Strength

If screw fit is used between lens cover and housing, then connection strength is improved, but risk of damage increases

Engineering Contradiction:

Improveconnection strengthVSAvoidrisk of damage

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent extracts the screw fastening mechanism that causes damage risk, replacing it with a damage-free attachment method where the lens cover integrates directly with the housing through engineered engagement features that eliminate mechanical fasteners

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The design accepts that the lens cover may be replaced rather than repaired, using a simple integrated mounting structure that is easier and less damaging to install repeatedly compared to screw fastening that can strip threads or crack components

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Strength

If screw fit is used between lens cover and housing, then connection strength is improved, but reliability under vibration decreases

Engineering Contradiction:

Improveconnection strengthVSAvoidreliability under vibration

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent removes the screw fastening system that deforms under vibration, replacing it with an integrated lens cover design that distributes mechanical stress across the entire mounting interface rather than concentrating it at discrete screw points

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The design changes the mechanical parameters of the connection from discrete point contacts (screws) to distributed surface contact (integrated mounting), altering how forces are transmitted and reducing the impact of vibrational stresses on connection integrity

Inventive Principle:

Principle #35Parameter changes

4Strength

If screw fit is used between lens cover and housing, then connection strength is improved, but device complexity increases

Engineering Contradiction:

Improveconnection strengthVSAvoidassembly complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent extracts the screw fastening components and associated installation steps, simplifying the overall device by reducing the number of parts and assembly operations required to secure the lens cover to the housing

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The lens cover and mounting structure are merged into a single integrated component, reducing device complexity by eliminating separate fasteners and reducing the total number of parts that need to be managed, stored, and installed

Inventive Principle:

Principle #5Merging (Combining)

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 threadless fit simplifies the assembly process, reduces the risk of damage, and improves the stability of the connection under harsh conditions, leading to better heat dissipation and light distribution.

Implementation Method 1

the threadless fit may be an interference fit

Methodology Applied

Scientific EffectInterference fit: Friction

Implementation Method 2

the threadless fit may be a snap fit

Methodology Applied

Scientific EffectSnap fit: Elasticity

Data Source

PatentUS12305831B2Lighting fixture with threadless fit

Publication Date: 2025.05.20 HANGZHOU HPWINNER OPTO CORP

AI summary

Disclosed herein is a lighting fixture in which a threadless fit is achieved between a lens cover and a housing. The lighting fixture comprises a housing, a circuit board and a lens cover. The housing and the lens cover are arranged on opposite sides of the circuit board. The housing comprises a first slot. The lens cover comprises a first tab configured to fit into the first slot by a threadless fit, thereby securing the lens cover to the housing. Compared with lighting fixtures in the prior art, the lighting fixture of the present disclosure can save process steps, simplify manufacturing process, reduce manufacturing cost, and improve heat dissipation and light distribution efficiency.