Retainer System Plunger Actuation Panel Access

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Solution Overview

Problem

Existing imaging devices face challenges in accessing internal components for maintenance and repair due to complex and labor-intensive removable panel mechanisms that can affect the cosmetic appearance and require multiple tools.

Innovation Solution

A retainer system with a simple mechanism using internal latches and linkages, actuated by a plunger, which allows for easy removal of panels with minimal tools, preserving the device's aesthetic appearance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If complex removable panel mechanisms are used to secure internal components, then the panel retention reliability is improved, but the ease of operation deteriorates and device complexity increases

Engineering Contradiction:
Improvepanel retention reliabilityVSAvoidease of panel removal
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The retainer system is divided into multiple independent latches (first latch, second latch) that can be actuated separately or simultaneously. Each latch independently secures a portion of the panel, allowing for reliable retention while enabling simplified individual actuation through the plunger mechanism.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

A plunger acts as an intermediary component that translates simple linear pushing motion into the actuation of multiple latches. The plunger engages with linkage elements connected to both latches, converting ease-of-operation (simple push) into reliable latch disengagement.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Reliability

If multiple fasteners are used to attach the panel, then the panel retention reliability is improved, but the ease of operation deteriorates due to requiring multiple tools

Engineering Contradiction:
Improvepanel attachment reliabilityVSAvoidease of panel removal
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

Multiple latch mechanisms are merged into a unified retainer system that can be actuated by a single plunger. The latches share common structural elements and actuation pathways, combining the security of multiple fasteners with the simplicity of single-tool operation.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The plunger serves multiple functions: it acts as both the actuating tool and the linkage mechanism itself. A single component performs the work of multiple specialized tools would otherwise be needed, engaging with both latches through integrated linkage elements.

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Ease of operation

If exterior fasteners or handles are used for panel removal, then the ease of operation is improved, but the device appearance deteriorates

Engineering Contradiction:
Improveease of panel accessVSAvoiddevice cosmetic appearance
Core Design Contradiction:
Ease of operationVSShape

Solution Approach 1:

The actuation mechanism (plunger and latches) is extracted from the exterior surface and relocated to the interior of the device. This removes visible fasteners and handles from the cosmetic surface while maintaining interior functionality for panel retention and removal.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The retainer system uses internally-contained components that automatically engage and disengage without requiring external manipulation devices. The latches self-lock when the panel is installed and self-release when the plunger is actuated, eliminating the need for exterior handles or visible fastening mechanisms.

Inventive Principle:
Principle #25Self-service

4Ease of operation

If simple retainer mechanisms are used, then the ease of operation is improved, but the panel retention reliability may deteriorate

Engineering Contradiction:
Improveease of panel removalVSAvoidpanel retention reliability
Core Design Contradiction:
Ease of operationVSReliability

Solution Approach 1:

Different portions of the retainer system have specialized qualities optimized for their specific functions. The latches feature localized engagement surfaces and spring-loaded elements that provide strong retention forces, while the plunger maintains a simple actuation interface. Each component's local structure is optimized for its role in the overall system.

Inventive Principle:
Principle #3Local quality

Data Source

PatentEP3437104B1retainers
Publication Date: 2021.05.26 HEWLETT PACKARD DEVELOPMENT COMPANY LP
  • EP3437104B1 patent drawingFigure 1A~1B
  • EP3437104B1 patent drawingFigure 1C~2A
  • EP3437104B1 patent drawingFigure 2B~2C

AI summary

In an example, a retainer may include a first latch, a plunger, a second latch, and a linkage engaging the second latch with the first latch. The plunger may actuate the first latch, and the linkage may actuate the second latch upon the first latch being actuated.