Downlight Test Switch Bracket Inversion for Concealed Access

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Solution Overview

Problem

Conventional test switches for fluorescent lighting fixtures are difficult to install and aesthetically unpleasing as they mount on the outside of the fixture.

Innovation Solution

A test switch assembly with a bracket attached to the inside surface of the socket cup using a single fastener, which is less observable and can be further concealed by a reflector, allowing for easy installation and improved aesthetics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the test switch is mounted on the outside of the lighting fixture, then it is easily accessible for operation, but it becomes aesthetically unpleasing and difficult to install

Engineering Contradiction:

ImproveAccessibility of test switchVSAvoidInstallation difficulty and aesthetic appearance

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The test switch is inverted from the conventional external mounting position to an internal mounting position within the socket cup. This inversion allows the switch to be concealed within the fixture structure, improving aesthetics and simplifying installation while remaining accessible through the lamp opening.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The test switch assembly is nested within the socket cup structure, with the switch housing positioned inside the socket cup and the actuator extending through the lamp opening. This nesting approach allows the test switch to be integrated into the existing fixture structure without requiring external mounting.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Ease of manufacture

If the test switch is mounted internally within the socket cup, then aesthetics and installation ease are improved, but accessibility for operation may be reduced

Engineering Contradiction:

ImproveInstallation ease and aesthetic appearanceVSAvoidAccessibility of test switch

Core Design Contradiction:

Ease of manufactureVSEase of operation

Solution Approach 1:

The test switch actuator is inverted through the lamp opening, allowing users to access and operate the switch from the front of the fixture rather than from the rear or side. This maintains ease of operation while keeping the switch body concealed internally.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The test switch actuator extends through a different dimension (the lamp opening) to provide accessibility. Instead of requiring access to the rear or side of the fixture, the actuator is positioned to be reachable from the front, utilizing the vertical dimension through the socket cup.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Stability of the object's composition

If multiple fasteners are used to secure the bracket, then structural stability is improved, but installation complexity increases

Engineering Contradiction:

ImproveBracket stabilityVSAvoidInstallation complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

Instead of using multiple fasteners to secure the bracket, the design uses a single snap-fit engagement point. This partial action approach provides sufficient stability for the test switch application while dramatically simplifying installation, eliminating the need for tools and multiple fastening operations.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The mechanical fastening system (screws, nuts, or multiple clips) is replaced with a simple snap-fit engagement mechanism. This substitution maintains adequate structural stability for the low-vibration, low-stress environment of a lighting fixture while reducing installation complexity to a single-piece attachment operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS8079728B2Indicator test switch for downlight lighting device and bracket therefor

Publication Date: 2011.12.20 HUBBELL LIGHTING INC

AI summary

A lighting device including a test device for testing the proper operation of a primary and a secondary power supply alternatively providing electrical power to the light. The test device is attached to a bracket using a single fastener such as a nut and the bracket is attached to a receptacle for the light using a different single fastener, such as a pop-rivet or screw.