Swivel Chair Chassis With Gravity-Adaptive Tilt Reset
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Solution Overview
Problem
Existing swivel chair chassis designs are not universally adaptable to different user weights, leading to discomfort and inadequate reset forces, as the tilt angle and reset force are not optimally matched for users with varying weights, making it difficult for light-weight users to tilt and heavy-weight users to reset.
Innovation Solution
A swivel chair chassis with a base connected to an air rod, a bracket for fixing the seat, and a tilting plate connected to the backrest, featuring a four-point connecting rod mechanism that adjusts the reset force based on the user's weight, using pin shafts and connecting rods to distribute gravity and provide consistent support and reset force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a torsion spring is used to provide reset force for the backrest, then the backrest can automatically reset after tilting, but the reset force is insufficient for users with different weights, making it difficult for light-weight users to tilt and heavy-weight users to reset
Solution Approach 1:
The patent transforms the static reset force provided by a torsion spring into a dynamic reset force by utilizing the user's own weight. As the backrest tilts, the connecting rod mechanism converts the gravitational force acting on the user into a restoring force that increases with the tilt angle, automatically adapting to different user weights without requiring adjustment mechanisms.
Solution Approach 2:
The system uses the user's weight itself as the source of reset force, eliminating the need for externally adjusted springs or motors. The gravitational force on the user's body automatically provides the necessary restoring force through the connecting rod mechanism, making the system self-adjusting to different users.
2Ease of operation
If the backrest tilt angle is increased to improve comfort, then the reset force required increases, but the elastic reset device cannot provide sufficient force when the tilt angle is maximum
Solution Approach 1:
The reset force is made dynamic by leveraging the changing gravitational moment arm as the backrest tilts. At small tilt angles, the reset force is small and comfortable; at maximum tilt angles, the gravitational force generates maximum restoring moment, automatically providing the necessary force throughout the entire range of motion without requiring over-engineering for peak conditions.
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 design ensures comfortable and easy tilting and resetting for users of all weights by dynamically adjusting the reset force, reducing reliance on elastic reset devices and improving the chair's universality and user-friendliness.
Implementation Method 1
the reset force excessively depends on the elastic recovery of an elastic reset device
Implementation Method 2
the gravity applied onto the surface of the chair is conducted into the reset force of the backrest
Data Source
AI summary
A gravity self-adapted chassis of chair has the first plug pin, second plug pin, third plug pin, forth plug pin, tilting plate, first connecting rod, and the second connecting rod of the chassis form into a four-point connecting rod mechanism so as to form the conduction of the force, the backrest is fixedly connected with the tilting plate to offer the driving force of the four-point connecting rod mechanism, the gravity applied onto the seat by the users forms into the reset force applied onto the four-point connecting rod mechanism through the third plug pin hinged with the bracket, and the driving force and the reset force of the four-point connecting rod mechanism form into the confrontation relationship.