Chair Seat Positioning Clamp for Reliable Angle Locking
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Solution Overview
Problem
Existing positioning devices for inclinable chair seats are inconvenient to operate and lack reliability in maintaining the desired inclination angle.
Innovation Solution
A positioning device with clamping members and a spring mechanism that allows for easy adjustment and secure locking of the seat angle, featuring a handle that pivots between release and clamping positions, engaging with low- and high-profile sections of a positioning groove to control the clamping action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a knob is used as a positioning device, then the structure is simple, but the operation is inconvenient and the positioning effect is unreliable
Solution Approach 1:
The positioning device transitions from a static knob to a dynamic clamping mechanism with movable clamping members that can switch between clamped and released states, enabling both simple structure and convenient operation through state transformation
Solution Approach 2:
A handle is introduced as an intermediary component to operate the clamping mechanism, mediating between the user's manual input and the clamping action, thereby improving operational convenience without significantly increasing structural complexity
2Device complexity
If a knob is used as a positioning device, then the structure is simple, but the positioning reliability is insufficient
Solution Approach 1:
The device uses dynamic clamping members that can actively engage with and clamp the positioning rod, providing reliable positioning through mechanical interlocking rather than relying on friction alone as in simple knob designs
Solution Approach 2:
The clamping members integrate multiple functions including positioning, clamping, and releasing actions into a single mechanism, combining structural simplicity with enhanced reliability through functional integration
3Reliability
If clamping members are added to improve positioning reliability, then the positioning effect is reliable, but the device complexity increases
Solution Approach 1:
The clamping mechanism is segmented into first and second clamping members that can independently clamp the positioning rod, distributing the clamping function across multiple components while maintaining overall structural simplicity through modular design
Solution Approach 2:
The clamping members serve multiple functions including positioning, clamping, and indicating the clamped state through their positioning blocks, reducing the need for separate components and thereby limiting the increase in device complexity
4Ease of operation
If a spring is added to bias clamping members to open state, then the operation is convenient with automatic release, but the device complexity increases
Solution Approach 1:
The spring provides self-service by automatically biasing the clamping members to the open state, enabling convenient operation through automatic release without requiring additional actuators or complex control mechanisms
Solution Approach 2:
The spring introduces dynamic capability to the clamping members, allowing them to automatically transition between clamped and released states, thereby improving operational convenience while adding only a single elastic component to the structure
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 simple and reliable operation for adjusting and locking the seat angle, ensuring smooth movement during adjustment and secure fixation at the desired position, reducing friction through a bearing mechanism.
Implementation Method 1
A spring is mounted between the first and second clamping members to bias the clamping portions to an open state not clamped on the fixed rod
Implementation Method 2
reducing friction through a bearing mechanism
Data Source
AI summary
A positioning device includes a clamping seat having two clamping members having clamping portions mounted around a fixed rod of a chair having an inclinable seat to which one of the clamping members is fixed. An adjusting rod includes a coupling seat and a handle fixed to the coupling seat. The coupling seat includes a positioning groove having a low-profile section and a high-profile section. A positioning block is mounted to the other clamping member and includes a protrusion received in the positioning groove. When the protrusion is engaged with the low-profile section, the clamping portions are not clamped on the fixed rod, allowing movement of the clamping seat along the fixed rod. When the handle is moved to a clamping position, the protrusion is engaged with the high-profile section, the clamping portions are clamped on the fixed rod, not allowing movement of the clamping seat along the fixed rod.