Nested Screw Lifting Column With Low Retracted Height
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Solution Overview
Problem
Conventional lifting columns have a high retracted height, making them inconvenient to handle due to their design, which often includes a higher number of sections to achieve a longer stroke length.
Innovation Solution
A five-section lifting column design with nested tubes and screw rods, featuring threaded connections and guide sleeves to reduce retracted height and enhance compactness, along with a self-locking mechanism and oil grooves for reduced friction and smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional two-section or three-section lifting columns are used to achieve longer stroke length, then the lifting column can provide sufficient lifting range, but the retracted height becomes relatively high causing inconvenience to handle
Solution Approach 1:
The patent applies nested structure by placing multiple screw rods (first, second, third screw rods) and tubes (first, second, third tubes) sequentially from inside to outside, similar to nested dolls. This allows the lifting column to achieve a stroke length of 450mm while reducing the retracted height to only 65mm, as each component is compactly arranged within the previous component's space.
Solution Approach 2:
The lifting column is divided into multiple independent sections including first, second, and third tubes that can move relative to each other, and first, second, and third screw rods that independently control each tube's movement. This segmentation allows each section to be optimized for compact retraction while collectively providing the required stroke length.
2Length of moving object
If more sections are added to the lifting column to increase stroke length, then the lifting range is extended, but the structural complexity and number of components increase
Solution Approach 1:
By nesting multiple screw rods and tubes within each other, the patent achieves a stroke length of 450mm using only three main tube sections and three screw rod sections. The nested arrangement allows these components to serve multiple functions simultaneously, reducing the need for additional separate components that would increase complexity.
Solution Approach 2:
Each screw rod serves multiple functions: it provides lifting motion for its associated tube, acts as a guide for the tube's movement, and contributes to the overall structural support. This multi-functionality reduces the total number of components needed compared to conventional designs where each element has a single dedicated function.
3Ease of operation
If conventional lifting columns with higher retracted height are used, then they can accommodate the mechanical components, but they cause inconvenience to handle due to their height
Solution Approach 1:
The nested arrangement of tubes and screw rods allows all mechanical components to be compactly stored within a retracted height of only 65mm. This compact nesting makes the lifting column much easier to handle and install in spaces with limited vertical clearance, while still providing a stroke length of 450mm when extended.
Solution Approach 2:
The lifting column transitions from a compact static state (retracted height 65mm) to an extended dynamic state (stroke length 450mm) when needed. This dynamic capability allows the column to maintain low retracted height for ease of handling while providing sufficient lifting range during operation.
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 achieves a low retracted height and large stroke length, ensuring convenient handling and reliable operation through compactness and smooth transmission, while the self-locking mechanism and grease storage in oil grooves enhance the lifting column's functionality.
Implementation Method 1
a lower end of the second screw rod is provided with a first nut in threaded transmission connection with the first screw rod
Implementation Method 2
an upper end of the first screw rod is provided with a first guide sleeve that limits an axial position of the first nut
Implementation Method 3
The lifting tube comprises a first tube, a second tube, a third tube, a fourth tube, and a fifth tube, which are sequentially nested from inside to outside
Implementation Method 4
A lower end of the first screw rod is sleeved with a self-locking device
Implementation Method 5
an oil groove is provided on an inner wall of each of the second screw rod, the third screw rod, and the fourth screw rod
Data Source
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AI summary
A low mounting distance raising column, comprising a drive unit, a lifting tube, and a transmission assembly. The lifting tube includes a first tube, a second tube, a third tube, a fourth tube, and a fifth tube, a lower end of the fifth tube being secured on the drive unit. The transmission assembly includes a first screw rod, a second screw rod, a third screw rod, and a fourth screw rod, an output end of the drive unit being in transmission fit with the first screw rod and configurable to drive the first screw rod to rotate. A lower end of the second screw rod is provided with a first nut in threaded transmission connection with the first screw rod, a lower end of the third screw rod is provided with a second nut in threaded transmission connection with the second screw rod, a lower end of the fourth screw rod is provided with a third nut in threaded transmission connection with the third screw rod, and a lower end of the first tube is provided with a fourth nut in threaded transmission connection with the fourth screw rod. Since the adjacent screw rods are in threaded transmission connection and respective nut is provided between every two adjacent screw rods, a transmission assembly which is compact in both axial and radial directions is achieved, thereby implementing a low retracted-height, large stroke-length lifting column.