Gear-Driven Rail Unit With Buffering for Foldable Housing Motion

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Solution Overview

Problem

Existing electronic devices with flexible displays face challenges in smoothly transitioning between different shapes and sizes due to mechanical limitations and impact mitigation during movement.

Innovation Solution

Incorporation of a rail unit with a base, fastening member, and buffer member to facilitate smooth movement and mitigate impact, using a driving unit with gears and motors to manage the housings' relative motion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a gear-driven mechanism is used to enable flexible display devices to transition between different shapes and sizes, then the adaptability and shape transformation capability are improved, but mechanical impact and stress during movement increase

Engineering Contradiction:

Improveshape transformation capabilityVSAvoidmechanical impact

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a buffer member positioned between the second gear and the fastening member to absorb and mitigate mechanical impact before it reaches critical components. This beforehand cushioning approach prevents damage during the shape transformation process while maintaining the gear-driven mechanism's adaptability benefits.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The buffer member acts as an intermediary element between the gear system and the housing connection, mediating the transmission of mechanical forces. This intermediary component protects the fastening member from direct impact while allowing the gear mechanism to continue its shape transformation function.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the second housing is made movable relative to the first housing to enable shape transformation, then the versatility is improved, but the structural stability and reliability deteriorate

Engineering Contradiction:

Improveshape transformation capabilityVSAvoidstructural stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent implements a dynamic structure where the second housing can move relative to the first housing along a rail, enabling shape transformation while maintaining controlled stability. The rail-guided movement ensures the housing remains structurally stable during transition, preventing uncontrolled movement that would compromise reliability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The buffer member provides beforehand cushioning to protect the movable housing connection from impact damage during shape transformation, maintaining structural reliability while enabling the desired versatility.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Strength

If a fastening member is used to connect the base to the second housing, then the structural strength is improved, but the impact on the second gear increases

Engineering Contradiction:

Improveconnection strengthVSAvoidimpact on second gear

Core Design Contradiction:

StrengthVSForce

Solution Approach 1:

The buffer member serves as an intermediary between the fastening member and the second gear, allowing the fastening member to maintain strong structural connection while preventing direct transmission of impact forces to the gear. This mediator approach preserves both connection strength and gear protection.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The buffer member converts the potentially harmful impact force into a beneficial cushioning effect, absorbing the shock that would otherwise damage the second gear while allowing the fastening member to maintain its strong connection function.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

Enables seamless shape transformation and effective impact absorption, enhancing user experience and device durability.

Implementation Method 1

a buffer member including deformable material provided between the second gear and the fastening member and configured to mitigate an impact applied to the second gear

Methodology Applied

Scientific EffectImpact absorption: Deformation

Data Source

PatentUS20260016859A1Electronic device comprising rail unit

Publication Date: 2026.01.15 SAMSUNG ELECTRONICS CO LTD

AI summary

An electronic device may comprise: a first housing; a second housing movable relative to the first housing in a first direction or a second direction opposite the first direction; a driving unit including a first gear and a motor for rotating the first gear and provided in the first housing; and a rail unit including a second gear and moves the second housing while the second gear is engaged with the first gear and moved by rotation of the first gear. The rail unit may comprise: a base coupled to the second housing and to which the second gear is slidably connected in the first direction or the second direction; a fastening member connecting one end of the base to the second housing; and a buffer member provided between the second gear and the fastening member to buffer an impact applied to the second gear.