Folding chair framework
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Solution Overview
Problem
Folding chair frameworks are inconvenient to use and lack stability during unfolding, posing a safety hazard due to the manual sliding mechanism and absence of a stable limiting mechanism.
Innovation Solution
Incorporation of a guide sleeve with a first spring, second springs, wedge-shaped blocks, and a clamping ball mechanism that allows for controlled sliding and limiting of the guide sleeve, enabling easier and more stable unfolding and folding by utilizing a pedal to align slots and resistances to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual sliding mechanism is used for the guide sleeve, then the structure is simple, but the ease of operation deteriorates and reliability worsens
Solution Approach 1:
The guide sleeve mechanism is designed to automatically lock and unlock through the interaction of the clamping ball, wedge-shaped blocks, and spring assembly. When the guide sleeve moves to specific positions, the clamping ball automatically engages with the limiting groove to lock it in place, and the spring automatically pushes the wedge-shaped blocks to engage with the guide rod. This self-service mechanism eliminates the need for manual locking operations, significantly improving ease of operation while maintaining reasonable structural complexity
Solution Approach 2:
The spring assembly is pre-loaded to continuously push the wedge-shaped blocks against the guide rod, creating a preliminary locking condition. The clamping ball is positioned in advance within the guide sleeve to ready the limiting mechanism. When the guide sleeve reaches the desired position, these pre-positioned elements automatically engage without requiring additional user action, making the operation simpler and more reliable
2Reliability
If manual sliding mechanism is used for the guide sleeve, then the device complexity is low, but the reliability deteriorates due to lack of limiting mechanism
Solution Approach 1:
The clamping ball acts as an intermediary element between the guide sleeve and the limiting groove. When the guide sleeve moves to the locked position, the clamping ball engages with the limiting groove to prevent further movement, providing a reliable mechanical limit. The wedge-shaped blocks serve as intermediaries between the spring force and the guide rod, translating the spring's pushing force into a locking action. These intermediary elements enhance reliability by providing positive mechanical limiting without requiring complex control systems
Solution Approach 2:
The spring assembly is pre-loaded to continuously exert force on the wedge-shaped blocks, creating a preliminary locking condition before the guide sleeve actually reaches the locked position. This beforehand cushioning ensures that as soon as the guide sleeve arrives at the limiting position, the locking mechanism is already in place to immediately secure it, preventing any accidental movement or instability during the unfolding process
3Stability of the object's composition
If the guide sleeve is manually slid to unfold the chair, then the device complexity is simple, but the stability during unfolding deteriorates
Solution Approach 1:
The wedge-shaped blocks serve as intermediary elements that translate the vertical movement of the guide sleeve into a horizontal locking action against the guide rod. As the guide sleeve moves downward during unfolding, the wedge-shaped blocks are forced outward by the spring to engage with the guide rod, creating a stable mechanical interlock. This intermediary mechanism ensures stability during the unfolding process by providing positive mechanical limiting at key positions, preventing accidental collapse or instability
Solution Approach 2:
The spring assembly is pre-loaded to continuously push the wedge-shaped blocks against the guide rod, creating a preliminary locking condition before the guide sleeve actually reaches the locked position. This beforehand cushioning ensures that as soon as the guide sleeve arrives at the limiting position, the locking mechanism is already in place to immediately secure it, preventing any accidental movement or instability during the unfolding process
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 mechanism ensures the stability of the unfolding process and simplifies the folding and unfolding process, preventing accidental movement of the guide sleeve and enhancing user convenience.
Implementation Method 1
the first spring is stretched. When the pedal is rotated to the other end of the first avoiding slot, the second avoiding slots are aligned with the wedge-shaped blocks and can allow the wedge-shaped blocks to pass. At this time, the first spring actuates the guide sleeve to move upwards
Implementation Method 2
wedge-shaped surfaces are arranged at upper ends of the wedge-shaped blocks. When the guide sleeve slides down from tops of the wedge-shaped blocks to a bottom end of the inner sleeve and resists against the wedge-shaped surfaces, the wedge-shaped surfaces make the wedge-shaped blocks move into the first grooves
Implementation Method 3
a clamping ball is arranged on an inner wall of the inner sleeve; a sliding chute is formed in an outer wall of the guide rod; the clamping ball is slidably connected into the sliding chute
Data Source
AI summary
The present disclosure relates to a folding chair framework, including a connecting seat, a guide rod, a guide sleeve, several chair legs, several supporting rods, several connecting rods, a first spring, a second spring, and wedge-shaped blocks; upper ends of the chair legs are all hinged with the connecting seat; the guide rod is vertically arranged and connected to the connecting seat; the guide sleeve is slidably connected to the guide rod; each connecting rod is hinged with the guide sleeve and one chair leg respectively; upper and lower ends of the first spring are respectively connected to the connecting seat and the guide sleeve; the wedge-shaped blocks are slidably connected into first grooves of the guide rod; two ends of the second spring are respectively connected to the first grooves and the wedge-shaped blocks; the guide sleeve includes an inner sleeve and an outer sleeve.