HVAC access panel latch systems and methods

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Solution Overview

Problem

Existing HVAC access panel latches are expensive to manufacture, require tools for operation, and can scratch the exterior paint or coating of HVAC units, necessitating additional handle assemblies for transitioning between closed and open positions.

Innovation Solution

A latch assembly with a stepped configuration and a rotatable locking system that applies pressure to a gasket for an air-tight seal, featuring a handle for easy operation and a design that minimizes contact with the exterior surface to prevent scratching, while being cost-efficient and tool-free.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional latch systems are used to secure HVAC access panels, then the panels can be securely closed and sealed, but the exterior paint or coating on the HVAC unit is scratched and damaged

Engineering Contradiction:

Improvesecuring access panelVSAvoidpaint scratching

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a receiver assembly with a receiving bore that acts as an intermediary between the latch bolt and the HVAC unit exterior. The latch bolt engages with the receiving bore internally, preventing direct contact between the latch mechanism and the exterior paint surface, thereby eliminating scratching while maintaining secure panel closure

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Instead of having the latch mechanism contact the exterior surface from the outside, the patent inverts the engagement approach by having the latch bolt engage with a receiving bore from the interior side. This reversal of the engagement direction protects the exterior paint while achieving the same securing function

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If complex latch mechanisms with multiple components are used to ensure secure closure and sealing, then the sealing effectiveness is improved, but the manufacturing cost increases

Engineering Contradiction:

Improvesealing effectivenessVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent combines multiple functions into unified components. The receiver assembly integrates the receiving bore, seal engagement surface, and structural support into a single component. The latch assembly merges the latch bolt, handle, and engagement mechanism into one integrated unit, reducing part count and manufacturing complexity while maintaining effective sealing

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The latch bolt serves multiple functions: it secures the access panel to the HVAC unit, engages with the seal to ensure weatherproofing, and interfaces with the receiver assembly for controlled operation. This multi-functionality eliminates the need for separate components for each function, reducing manufacturing cost

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Strength

If traditional latches require tools for operation, then the locking mechanism can be more robust, but the ease of operation decreases and additional handle assemblies are needed

Engineering Contradiction:

Improvelocking mechanism robustnessVSAvoidtool-free operation

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The latch mechanism is designed to be self-operating through the handle assembly. The handle directly rotates the latch bolt, which automatically engages and disengages from the receiver assembly without requiring external tools. The system serves itself through direct mechanical coupling between the handle and latch components

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The latch system is segmented into distinct functional components: the handle assembly for operation, the latch bolt for securing, the receiver assembly for engagement, and the seal for weatherproofing. This segmentation allows each component to be optimized for its specific function while working together as an integrated system that is both robust and easy to operate

Inventive Principle:

Principle #1Segmentation

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 latch assembly provides an efficient, cost-effective, and paint-protecting solution for securing HVAC access panels with an air-tight seal, reducing manufacturing costs and operational complexity.

Implementation Method 1

The latch assembly is configured to provide a force on the gasket via the access panel in a locked configuration of the latch assembly to provide the sealing engagement

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 2

a threaded rod coupled to the latch plate, and a locking nut disposed on the threaded rod. The locking nut is configured to be rotated to secure the second surface to the structural support

Methodology Applied

Scientific EffectMechanical Advantage: Mechanical Advantage

Data Source

PatentUS10830460B2HVAC access panel latch systems and methods

Publication Date: 2020.11.10 JOHNSON CONTROLS LIGHT COMMERCIAL IP GMBH

AI summary

In an embodiment of the present disclosure, a latch assembly for an access panel of a housing includes a latch structure having a first surface, a second surface, and an intermediate step therebetween. The latch assembly also includes a fastener configured to facilitate coupling of the first surface to the access panel, and a locking system configured to engage with a structural support of the housing via the second surface. The locking system is configured to be rotated to secure the second surface to the structural support and rotated to release the second surface from the structural support.