Convertible Sofa Stretching Mechanism for Low Seat Height
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Solution Overview
Problem
Current mechanical stretching devices for convertible sofas are high, leading to discomfort, poor aesthetics, and limited application due to inflexible design, exposed connecting rods, and inadequate cushion thickness.
Innovation Solution
A mechanical stretching device with symmetrically connected components, including foot plates, levers, connecting rods, and a rotating shaft transmission member, which allows for adjustable seat height, flexible back angle, and improved aesthetics by reducing the seat height and increasing cushion thickness, enabling armrests to touch the ground and enhancing overall comfort and design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the seat height is increased to provide structural support, then the mechanical strength is improved, but the user comfort deteriorates because feet cannot touch the ground
Solution Approach 1:
The patent introduces a telescopic leg mechanism that extends the support structure vertically downward, moving the support function to a different dimensional space. This allows the seat to maintain high structural support while the effective seating height remains low, enabling feet to touch the ground for user comfort.
Solution Approach 2:
The support structure is divided into multiple segments: the main seat frame and the telescopic leg assembly. The telescopic leg can extend and retract independently, allowing the support function to be separated from the seat height, thus resolving the contradiction between structural support and user comfort.
2Adaptability or versatility
If the seat, back, and armrests are made high to provide functionality, then the functional versatility is improved, but the aesthetic harmony deteriorates because the sofa becomes too big
Solution Approach 1:
The patent employs telescopic legs that can dynamically adjust their length. When retracted, the sofa maintains a compact, aesthetically pleasing profile. When extended, they provide the necessary functional support, allowing the sofa to adapt its shape based on operational needs without compromising aesthetic harmony.
Solution Approach 2:
The telescopic leg mechanism is nested within the seat structure. When retracted, the legs are hidden inside the seat frame, giving the appearance of a low-profile, harmonious design. When needed, they extend outward to provide functional support, maintaining aesthetic harmony while enabling versatility.
3Adaptability or versatility
If the seat height is increased to accommodate mechanical components, then the device functionality is improved, but the visual aesthetics deteriorates because connecting rods become exposed
Solution Approach 1:
The telescopic leg mechanism and connecting rods are nested within the seat structure. When retracted, these mechanical components are hidden inside the seat frame, preventing visual exposure and maintaining aesthetic appearance. The functionality is preserved as the mechanism can extend when needed.
4Strength
If the seat height is increased to provide structural support, then the mechanical strength is improved, but the cushion thickness deteriorates because the available space is reduced
Solution Approach 1:
The patent moves the structural support function to the vertical dimension by extending telescopic legs downward. This frees up the horizontal and depth dimensions within the seat, allowing for thicker, more comfortable cushions without compromising structural support capability.
Data Source
AI summary
A mechanical stretching device of a convertible sofa includes left components, right components, a switch component, and a locking spring. The left components are fixedly connected to the right components by fixing components. The switch component is mounted on the left components or on the right components. The left components and the right components respectively include a foot plate, a first foot lever, a second foot lever, a third foot lever, a fourth foot lever, a fifth foot lever, a side plate, a rotating shaft transmission member, a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod, a sixth connecting rod, a back member, a calf plate, a first support member, a second support member, a linkage member, a protective member, a seahorse member, and a bottom foot.