Convertible Seating Linkage Without Separate Mattress Storage
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Solution Overview
Problem
Existing convertible sofa-beds are either heavy with intricate mechanisms or lack a complete mattress, and hospital-grade convertible beds often lack arms to prevent tipping, compromising comfort and safety.
Innovation Solution
A seating unit with a base, rear support, backrest, seat, and folding mechanism using pivotally interconnected links that convert between a sitting and a horizontal bed configuration, with an armless design for hospital use and optional storage and locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complete mattress is folded within the cavity of the sofa, then a comfortable sleeping surface is provided, but the unit becomes heavy and requires an intricate mechanism
Solution Approach 1:
The patent removes the complete mattress from the sofa structure, extracting only the essential support function. The seating unit uses the existing seat and backrest sections to form a mattress-like sleeping surface without requiring a separate folded mattress, thereby eliminating the need for intricate mattress storage and deployment mechanisms while maintaining sleeping comfort
Solution Approach 2:
The seat and backrest sections serve dual functions: they provide seating support during the day and form the sleeping surface at night. This multi-functionality eliminates the need for a separate mattress and complex folding mechanisms, resolving the contradiction between comfort and mechanism intricacy
2Ease of operation
If arms are added to the seating unit, then comfort and support are improved, but the risk of tipping over or arms breaking increases
Solution Approach 1:
The patent removes arms from the seating unit design, extracting the problematic element that causes tipping risks. The armless configuration eliminates the structural weaknesses and tipping hazards associated with arms while maintaining adequate support through properly designed seat and backrest sections
Solution Approach 2:
The patent provides support and comfort through localized design features in the seat and backrest sections rather than through arms. The seat cushion, backrest cushion, and structural contours are optimized to provide necessary support without requiring arms, thus maintaining comfort while eliminating safety risks
3Reliability
If the seating unit is designed for hospital use without arms, then safety is improved, but comfort may be compromised
Solution Approach 1:
The patent compensates for the absence of arms by optimizing local features such as seat cushioning, backrest support, and overall structural design. These localized quality improvements ensure that comfort is maintained through better-distributed support and ergonomics rather than relying on armrests
Solution Approach 2:
The seat and backrest sections are designed to provide both seating comfort and sleeping support in a single structure. This multi-functional design ensures that visitors receive adequate comfort and support for either sitting or sleeping without requiring separate features like arms, thereby maintaining safety while preserving comfort
Data Source
AI summary
A seating unit convertible into a bed includes: a base configured to rest on an underlying surface; a rear support pivotally interconnected with the base; a backrest having a backrest cushion; a seat having a seat cushion; a seat carriage; and a folding mechanism attached to the rear support, backrest and seat. The folding mechanism comprises a plurality of pivotally interconnected links that are configured and arranged to move the rear support, backrest and seat between a folded position, in which the rear support is generally upright, the backrest is generally upright and positioned forwardly of the rear support, the seat is generally horizontal and positioned forwardly of the backrest, and the seat carriage is positioned above the base and below the seat, and an unfolded position, in which the rear support, the backrest, and the seat are substantially horizontal and serially aligned with each other, the rear support is above the base, and the seat carriage is positioned below the seat and forward of the base.