Convertible Ottoman Lid-Backrest Mechanism for Stable Seating
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Solution Overview
Problem
Ottomans lack a backrest, making them uncomfortable for extended sitting, and existing solutions do not provide a convenient and stable conversion into a seating unit with a backrest.
Innovation Solution
A convertible ottoman design featuring a pivotally attached lid that transforms into a backrest, with mechanisms allowing the seat to adjust between lowered and raised positions for comfort, incorporating pivotally interconnected members and a spring for stability and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an ottoman is used to support feet, then it provides storage and portability, but it lacks a backrest making it uncomfortable for extended sitting
Solution Approach 1:
The lid is made movable rather than fixed, allowing it to pivot between a closed position (overlying the body for storage) and an open position (upright to form a backrest). This dynamic transformation enables the ottoman to adapt between footrest and seating functions with backrest support
Solution Approach 2:
The lid serves multiple functions: it acts as a cover when closed for storage purposes, and transforms into a backrest when opened for seating. This multi-functionality resolves the contradiction by providing both storage capability and backrest support within a single structural element
2Ease of operation
If the lid is made movable to form a backrest, then seating comfort is improved, but the mechanism increases device complexity
Solution Approach 1:
The mechanism is divided into separate pivotally interconnected members (first link member, second link member, third link member) that can move independently. This segmentation allows complex motion control to be achieved through simpler, modular components rather than a single complex mechanism
Solution Approach 2:
Link members act as intermediaries between the lid and the base, transmitting and controlling motion. These intermediary elements simplify the overall mechanism by breaking down the direct connection into manageable segments that can be controlled through gravitational and mechanical forces
3Ease of operation
If the seat is raised to comfortable height, then seating comfort is improved, but the mechanism complexity increases
Solution Approach 1:
The seat is designed to move dynamically between lowered and raised positions through the linkage mechanism. This dynamic adjustment allows the seat to achieve a comfortable raised position while maintaining structural simplicity through motion-based functionality rather than fixed complex supports
Solution Approach 2:
The mechanism uses gravitational force and counterbalancing through the linkage system to enable smooth seat adjustment. The interconnected members work together to balance forces, allowing the seat to be raised to a comfortable height without requiring complex motorized or spring-based counterweight systems
Data Source
AI summary
An ottoman convertible to a seating unit includes: a body; a seat associated with the body; and a lid pivotally attached to the body, the lid having an underside. The lid is movable between a closed position, in which the lid overlies the body, the seat is beneath the lid, and the underside of the lid faces generally downwardly, and an open position, in which the lid is generally upright and located above a rear portion of the body, the underside of the lid faces generally forwardly and forms the backrest of a seating unit and the seat is accessible for a seated occupant. The seat is inclined from rear to front. Typically, movement of the lid and the seat (if any) is controlled by one or more mechanisms that couple the seat and the lid.