Mechanism for transforming furniture from a sitting position to a lying down position
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Solution Overview
Problem
Existing mechanisms for transforming furniture from a sitting to a lying down position require manual adjustment of the backrest, lacking automatic lowering during opening and raising during closing, which is inconvenient and inefficient.
Innovation Solution
A mechanism with two mirror-reflected jacks connected by a synchronization mechanism, featuring pull rods, angle bars, and a backrest driving sub-assembly, allowing for simultaneous mattress unfolding and backrest rotation with automatic actuation during opening and closing, ensuring collision-free and ergonomic operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two independently operating mechanisms are used for mattress opening and backrest adjustment, then the functions are achieved, but the device complexity increases and automatic coordination between mattress opening and backrest lowering is lost
Solution Approach 1:
The patent combines two previously independent mechanisms (mattress opening mechanism and backrest adjustment mechanism) into a single integrated mechanism. The jack system now simultaneously controls both mattress unfolding and backrest lowering through unified mechanical linkages, reducing overall device complexity while maintaining full functional capability.
Solution Approach 2:
The jack mechanism is designed as a multi-functional device that performs multiple operations: opening the mattress, lowering the backrest, and coordinating their movements. This universal mechanism replaces two separate specialized mechanisms, achieving the same functional outcomes with a single integrated system.
2Device complexity
If manual adjustment of the backrest is required during furniture transformation, then the mechanism structure can be simpler, but the ease of operation deteriorates due to requiring two-stage manual intervention
Solution Approach 1:
The mechanism is designed to automatically coordinate backrest lowering with mattress opening through mechanical linkages. When the user initiates mattress opening, the backrest automatically lowers without requiring separate manual intervention. The system serves itself by using the opening motion to drive the backrest adjustment, eliminating the need for two-stage manual operation.
Solution Approach 2:
The backrest lowering action is prepared and executed in advance as part of the opening sequence. The mechanical linkages are pre-configured so that backrest lowering begins automatically when mattress opening starts, rather than requiring waiting for the opening to complete before adjusting the backrest.
3Device complexity
If the backrest lowering is not synchronized with mattress opening, then the mechanism design is simpler, but the reliability deteriorates due to potential finger injuries and collision-free operation is not ensured
Solution Approach 1:
The mechanical linkages create a feedback system where the position and movement of the mattress automatically control the backrest position. As the mattress opens, the linkages continuously adjust the backrest to maintain safe clearance, providing real-time positional feedback that prevents collision and finger pinching hazards.
Solution Approach 2:
Mechanical linkages act as intermediary elements between the mattress opening mechanism and the backrest adjustment mechanism. These intermediaries coordinate the movements of both components, ensuring they move in a synchronized manner that prevents harmful interactions while maintaining smooth operation.
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 transformation between positions with automatic backrest adjustment, enhancing usability and safety by eliminating manual intervention and preventing finger injuries during operation.
Implementation Method 1
The mechanism is equipped with springs which assist the operation of the jacks
Implementation Method 2
Each of the jacks consists of a front and rear lever in the form of pull rods and angle slats
Data Source
AI summary
A mechanism for transforming furniture from a sitting position to a lying down position has right and left jacks with identical design, which are a mirror reflection of each other, connected by a synchronisation mechanism. Each jack has a fastening plate which attaches the jack to the furniture body, angle bars, upper and lower for connecting with the mattresses, a spring and a front pull rod and rear pull rod with centre arms. Each jack has a backrest driving sub-assembly created from a backrest rotation pull rod and support to be connected with the backrest of the furniture, whereas the backrest rotation pull rod is connected in an articulated manner on one end with the bottom end of the rear pull rod, and on the second end is connected in an articulated manner with the support connected in an articulated manner to the fastening plate.