Sofa Bed Locking Mechanism for Compact Folding and Easy Conversion

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Solution Overview

Problem

Conventional sofa beds are bulky, aesthetically constrained, difficult to use, and complicated to manufacture due to their articulating mechanisms and multiple sections, which affect their functionality and appeal.

Innovation Solution

A convertible sofa bed with a compact folding apparatus that includes a mid-swinging and rear-swinging member, a locking mechanism, and bias members to facilitate easy conversion between sofa and bed configurations, reducing the need for heavy lifting and improving manufacturability by organizing components into modules.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional articulating mechanisms are used in sofa beds, then the bed sections can be converted between sofa and bed configurations, but the sofa bed becomes bulky and aesthetically constrained

Engineering Contradiction:

Improveconversion between sofa and bed configurationsVSAvoidbulkiness of sofa bed

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The articulating mechanism is divided into separate modular components: a first articulating mechanism for the head panel, a second articulating mechanism for the foot panel, and a third articulating mechanism for the middle panel. This segmentation allows each mechanism to be independently optimized and reduces overall complexity, enabling compact integration without compromising conversion functionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent integrates the articulating mechanisms within the sofa frame structure itself, nesting the mechanical components within the existing furniture geometry. The linkages and pivots are positioned to utilize the internal space of the sofa frame, eliminating the need for external bulky mechanisms and achieving a contemporary aesthetic profile.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Stability of the object's composition

If high threshold articulation is designed to provide stability, then the bed sections remain stable when deployed, but the sofa bed becomes difficult to use and requires heavy lifting

Engineering Contradiction:

Improvestability of bed sectionsVSAvoidease of conversion between configurations

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The patent incorporates springs as counterweight mechanisms within the articulating assemblies. These springs are positioned to counterbalance the weight of the mattress and panel sections during articulation, reducing the force required by the user to initiate and complete the folding/unfolding motion while maintaining stable locked positions at the extremes of the range of motion.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Solution Approach 2:

The articulating mechanisms are designed with dynamic characteristics that provide smooth, controlled motion throughout the range of movement. The linkage geometry and spring positioning create a mechanical advantage that varies during articulation, making the system easier to operate at critical transition points while maintaining stability when fully deployed or folded.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If multiple bulky components are used in the articulating mechanism, then the sofa bed can function as both sofa and bed, but the manufacturing process becomes complicated and time-consuming

Engineering Contradiction:

Improvedual functionality as sofa and bedVSAvoidcomplexity of articulating mechanism

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent designs the articulating mechanisms with universal characteristics, where similar linkage patterns and component types are reused across different panels. The first, second, and third articulating mechanisms share common design elements and component geometries, simplifying the manufacturing process by reducing the variety of unique parts that must be produced and assembled.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Ease of operation

If fabric-covered bed sections are used, then the sofa bed provides comfort when deployed, but the assembly process risks damaging the fabric portion

Engineering Contradiction:

Improvecomfort when laid uponVSAvoidease of assembly without fabric damage

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The patent separates the fabric-covered mattress sections from the rigid articulating mechanisms. Each panel consists of a structural frame that articulates mechanically, while the fabric mattress is attached as a separate layer. This segmentation allows the rigid components to be assembled and tested without fabric present, eliminating the risk of fabric damage during the complex articulating mechanism assembly process.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS10548406B2Articulated sofa bed with locking mechanism

Publication Date: 2020.02.04 AMERICAN LEATHER OPERATIONS LLC

AI summary

A seat convertible to a bed. The seat includes a locking mechanism for fixably maintaining a head panel section of the bed in a generally horizontal orientation when the bed is in the deployed configuration and releasing the head panel section from the deployed configuration by a lifting motion. The locking mechanism is connected to the head panel section and a mid-swinging member. The mid-swinging member pivotally attaches to the head panel section and a stationary mounting arm. The stationary mounting arm is fixably attached to a seat frame.