Central Axis Door Rotation for Compartment Access

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Solution Overview

Problem

Access devices in electronic apparatuses, such as printing devices, are susceptible to damage and misalignment due to non-central axis movement of doors, which can lead to inadequate cam action upon closing, exposing them to potential impacts and damage.

Innovation Solution

The access device features a door that rotates about a central axis, ensuring sufficient cam action upon closing and keeping the door within the compartment in both open and closed positions, reducing the risk of damage and misalignment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the door moves about a non-central axis (side edge, bottom, or top), then the door can provide access to the compartment, but the door may be exposed outside the compartment and susceptible to damage and misalignment

Engineering Contradiction:

Improvedoor access functionVSAvoiddoor durability and alignment

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies asymmetry by positioning the rotation axis at the center of the door rather than at the edge, creating a symmetric rotation pattern that keeps the door within the compartment boundaries. This central axis rotation ensures that the door swings equally in both directions without extending beyond the compartment envelope, thereby preventing exposure to external impacts while maintaining full access functionality.

Inventive Principle:

Principle #4Asymmetry

2Ease of operation

If the door rotates about a non-central axis, then the door can open to access the compartment, but insufficient cam action occurs upon closing

Engineering Contradiction:

Improvedoor opening capabilityVSAvoidcam action precision

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

By changing the rotation axis from an off-center position to a central position, the door's movement trajectory becomes symmetric. This symmetry ensures that the door engages with the cam mechanism at the optimal point during closing, generating sufficient cam action for precise positioning and secure closure. The central axis rotation maximizes the lever arm effectiveness throughout the entire rotation range.

Inventive Principle:

Principle #4Asymmetry

3Ease of operation

If the door is placed outside the compartment in open or closed position, then access is provided, but the door is exposed to inadvertent impacts and potential damage

Engineering Contradiction:

Improvecompartment accessVSAvoiddoor exposure to impacts

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent creates an equipotential protective environment by ensuring the door remains within the compartment boundaries during rotation. The central axis rotation mechanism ensures that the door's outer edge never extends beyond the compartment's protective envelope, maintaining a consistent protective boundary that shields the door from external impacts regardless of the door's angular position.

Inventive Principle:

Principle #12Equipotentiality

Data Source

PatentUS10300722B2Door to rotate to provide access

Publication Date: 2019.05.28 HEWLETT PACKARD DEVELOPMENT COMPANY LP

AI summary

An access device includes a door. The door is rotatable between a closed position and an open position. In the closed position, the door covers an access opening of a compartment of a main body of the electronic device. In the open position, the door uncovers the access opening of the compartment to enable a user to access an inside of the compartment. The door including at least one connector to movably connect to the main body to enable the door to rotate about a central axis thereof. The door resides within the compartment in the open position and the closed position.