Underframe with improved structure
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Solution Overview
Problem
Existing chair underframes have complex mechanisms, are inconvenient to operate, and have a compromised aesthetic due to numerous handles, which complicate the control of multiple functions.
Innovation Solution
An underframe with a simplified structure featuring an operating handle, reclining pull rope, and gas spring pull rope, allowing for adjustment of the backrest angle, cushion height, and back-and-forth movement using two pull ropes, reducing complexity and enhancing user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple handles are used to control lifting, backrest swinging, and cushion sliding functions, then the chair provides comprehensive adjustment capabilities, but the operation becomes cumbersome and troublesome
Solution Approach 1:
The patent merges multiple independent handles into a single integrated handle assembly. The first handle controls both the lifting function (via gas spring pull rope) and the backrest swinging function (via reclining pull rope), while the second handle controls the cushion sliding function. This consolidation reduces the number of separate control components and simplifies the user interface.
Solution Approach 2:
The handle assembly is designed as a multi-functional control unit that can operate multiple functions through a single integrated structure. The handles are equipped with multiple pull ropes (gas spring pull rope, reclining pull rope, cushion pull rope) that enable control over lifting, backrest adjustment, and cushion positioning, making the handle a universal control element for various chair functions.
2Adaptability or versatility
If three pull ropes are used to control lifting, backrest swinging, and cushion sliding, then comprehensive function control is achieved, but the mechanism becomes complex
Solution Approach 1:
The patent combines multiple pull rope mechanisms into an integrated handle assembly structure. Instead of having separate control mechanisms for each function, the handles serve as a unified control unit that manages multiple pull ropes (gas spring pull rope for lifting, reclining pull rope for backrest, cushion pull rope for cushion sliding) through a single assembled component, thereby reducing overall mechanism complexity.
3Adaptability or versatility
If multiple handles and pull ropes are installed, then multiple functions can be controlled, but the size increases and aesthetics are compromised
Solution Approach 1:
The patent merges multiple separate handles and pull ropes into a single integrated handle assembly. This consolidation reduces the visual clutter and physical space occupied by multiple separate components, resulting in a cleaner, more aesthetically pleasing appearance while maintaining all necessary control functions through the unified assembly.
Solution Approach 2:
The integrated handle assembly serves as a multi-functional control unit that combines lifting control, backrest adjustment, and cushion sliding control in one compact structure. This universal design maintains comprehensive functionality while presenting a streamlined, aesthetically pleasing form factor compared to multiple separate handles.
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
The solution simplifies the operation and aesthetics of the chair by consolidating control mechanisms, providing a more convenient and practical user experience through reduced handle complexity and improved adjustability.
Implementation Method 1
a gas spring pull rope; one end of the gas spring pull rope is fixedly at the cushion height adjusting mechanism through a gas spring pull rope groove
Implementation Method 2
a reclining pull rope; one end of the reclining pull rope is fixedly connected in the backrest angle adjusting mechanism through a groove
Data Source
AI summary
Disclosed is an underframe with an improved structure. The underframe includes an underframe body, an operating handle, a reclining pull rope and a gas spring pull rope, a cushion back-and-forth moving mechanism being installed on the outer side of the underframe body, the operating handle being installed through a left outer wall of the underframe body at a lower end of the cushion back-and-forth moving mechanism, a backrest installed on a rear end of the underframe body through a backrest connecting rod; and a reclining elastic adjusting mechanism is arranged at a front end of an inner wall of the underframe body, a backrest angle adjusting mechanism is arranged at the inner wall of the underframe body on a right side of the reclining elastic adjusting mechanism, a cushion height adjusting mechanism is fixedly connected in the underframe body.