Three-Rail Lock Mechanism for Low-Clearance Rack Removal

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Solution Overview

Problem

The existing three-member slide rail units require a large workspace for removing electronic apparatuses, which restricts cabinet installation locations, and often necessitate lifting the apparatus, making mounting and removal cumbersome due to the need for extensive rail extension and complex mechanisms.

Innovation Solution

A slide rail unit with an outer rail, a middle rail, and an inner rail, featuring a lock mechanism with a release member to allow the inner rail to slide out without extending the middle rail, and a suppression member to prevent the middle rail from sliding, reducing the required workspace and simplifying the installation process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the middle rail is completely extended to allow the inner rail to slide out for smooth removal, then the inner rail can be drawn out easily, but a large workspace in front of the cabinet is required which restricts cabinet installation locations

Engineering Contradiction:

Improveease of inner rail removalVSAvoidworkspace area in front of cabinet

Core Design Contradiction:

Ease of operationVSArea of stationary object

Solution Approach 1:

The slide rail system is divided into three independent segments: outer rail, middle rail, and inner rail. The lock mechanism enables selective disengagement of the inner rail from the middle rail without requiring the middle rail to be fully extended, allowing the inner rail to be removed in a segmented manner that reduces workspace requirements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The lock mechanism is activated in advance to release the press against the middle rail by the inner rail before the middle rail is extended. This preliminary locking action allows the inner rail to be drawn out independently without requiring the middle rail to be completely extended, thereby reducing the workspace area needed in front of the cabinet.

Inventive Principle:

Principle #10Preliminary action

2Area of stationary object

If the electronic apparatus is lifted up to a high position to remove it from the inner rail, then the apparatus can be taken out without extending the rails fully, but this creates a burden to the user

Engineering Contradiction:

Improveworkspace areaVSAvoiduser burden during removal

Core Design Contradiction:

Area of stationary objectVSEase of operation

Solution Approach 1:

Instead of lifting the electronic apparatus upward to remove it from the inner rail, the system inverts the approach by allowing the inner rail itself to be drawn out horizontally from the middle rail through the lock mechanism. This reverses the removal direction from vertical lifting to horizontal sliding, eliminating user burden while maintaining reduced workspace requirements.

Inventive Principle:

Principle #13The other way round (Inversion)

3Productivity

If a synchronizing mechanism and positioning mechanism are added to allow continuous drawing and stable mounting, then the inner rail can be drawn out continuously and positioned accurately, but the design and manufacture become complicated due to many members with complicated shapes

Engineering Contradiction:

Improvemounting and removal efficiencyVSAvoidnumber and complexity of mechanism members

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The lock mechanism integrates multiple functions into a single unified structure that combines locking, releasing, and positioning capabilities. Rather than using separate synchronizing and positioning mechanisms with multiple complex members, the lock mechanism merges these functions into one component that simplifies both design and manufacture while maintaining efficient mounting and removal operations.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention extracts and eliminates unnecessary complex mechanism members from the slide rail system. By removing the need for separate synchronizing and positioning mechanisms, the design focuses on the essential lock mechanism that provides the required functionality with fewer, simpler components, thereby reducing design and manufacturing complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

4Ease of operation

If the inner rail is drawn out after the middle rail is fully extended, then the inner rail can be removed smoothly, but the inner rail is subject to sway when mounted on the extended position making mounting difficult

Engineering Contradiction:

Improvesmooth sliding of inner railVSAvoidstability of inner rail when extended

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The lock mechanism performs a preliminary locking action that secures the inner rail to the middle rail at the retracted position before any drawing operation. This preliminary stabilization prevents the inner rail from being subject to sway when mounted, while still allowing smooth sliding during the drawing out process through the controlled release of the lock mechanism.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9380872B2Slide rail unit

Publication Date: 2016.07.05 CLOUD BYTE LLC

AI summary

The slide rail unit according to an exemplary of the invention includes an outer rail attachable to a rack, a middle rail slidably supported by the outer rail along the extending direction of the outer rail, and an inner rail slidably supported by the middle rail along the extending direction of the middle rail. The inner rail includes a lock mechanism. The lock mechanism includes a release member which releases a press against the middle rail by the inner rail when the inner rail slides in one direction along the extending direction of the middle rail, and a suppression member which prevents the middle rail from sliding in the one direction.