Height-Adjustable Table Locking Mechanism for Stable Positioning
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Solution Overview
Problem
Existing height adjustable tables using gas springs for height adjustment suffer from instability when air pressure is discharged, leading to unsteady table conditions.
Innovation Solution
A height adjustment mechanism that includes a locking mechanism with a cam and pressing portion to increase friction between the plug and inner sleeve, a guide sleeve with ball bearings to reduce friction, and a gas spring for lifting force, ensuring the table remains stable by preventing relative sliding between the outer and inner sleeves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a gas spring is used to drive the inner sleeve to slide vertically within an outer sleeve, then the table height can be adjusted, but the table becomes unstable when air pressure is discharged
Solution Approach 1:
The locking mechanism is activated before the gas spring fully extends or retracts, pre-positioning the locking block to engage with the toothed ring at the intended height position. This ensures the table top is securely locked at the desired height before any potential pressure loss occurs, preventing instability during or after the adjustment process
Solution Approach 2:
A locking mechanism comprising a locking block, toothed ring, and limiting groove acts as an intermediary between the gas spring and the table top. This intermediary mechanically locks the inner and outer sleeves at specific heights, providing stable support independent of gas spring pressure, thereby ensuring table stability even when air pressure is discharged
2Ease of operation
If original air pressure is used to hold the table height at a fixed position, then height adjustment is simple, but the table becomes unstable when air is discharged
Solution Approach 1:
The locking mechanism serves as a mechanical intermediary that takes over the height-holding function from the gas spring's air pressure. The locking block engages with the toothed ring at predetermined heights, providing reliable mechanical support that does not depend on maintained air pressure, thus ensuring stability while preserving ease of operation through simple gas spring actuation
Solution Approach 2:
The height adjustment range is segmented into discrete positions defined by the toothed ring's teeth. The locking block can only engage at these predetermined positions, creating distinct stable states. This segmentation allows simple gas spring operation while ensuring stability at each discrete height position, even when air pressure varies or is discharged
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 table is steady and stable by locking the height adjustment, reducing friction through ball bearings, and providing a lifting force, facilitating normal use and space-saving folding.
Implementation Method 1
a gas spring is generally used to drive an inner sleeve to slide vertically within an outer sleeve
Implementation Method 2
The locking mechanism presses the pressing portion against the outer wall of the inner sleeve to increase the friction between the plug and the inner sleeve
Implementation Method 3
The guide sleeve includes a plurality of through holes in which a plurality of ball bearings are embedded, and the ball bearings abut against the inner sleeve and the outer sleeve. The ball bearings convert sliding friction into rolling friction to reduce the overall friction.
Data Source
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AI summary
Disclosed are an elevation mechanism and a table. The elevation mechanism includes an outer sleeve, an inner sleeve, a plug, and a locking mechanism. The outer sleeve is sleeved outside the inner sleeve, and the outer sleeve and the inner sleeve are relatively slidable. The plug is sleeved outside the inner sleeve, and the plug is slidably connected to the inner sleeve. The plug is disposed at an upper end of the outer sleeve, and an outer wall of the plug is provided with a pressing portion. The locking mechanism is used to press the pressing portion tightly against an outer wall of the inner sleeve. The locking mechanism presses the pressing portion against the outer wall of the inner sleeve to increase the friction between the plug and the inner sleeve, so that the plug and the inner sleeve are relatively fixed.