Telescopic Lifting Column Force Path for Smooth Synchronous Motion
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Solution Overview
Problem
Existing synchronous lifting columns face issues with torque loads and stress on the housing due to force transmission through the guide, leading to unreliable telescopic movement and noise, especially when the table hits an object.
Innovation Solution
The lifting column design redirects force transmission from the spindle nut through a rigid connection to a shaft stub and mounting plate, bypassing the guide, allowing for more efficient dimensioning and incorporating a pressure transducer for squeeze protection, thus preventing uncontrolled movements and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If forces are led through the third member of the guide to the housing, then the connection can transfer forces and torque loads, but the torque load is transferred to the guide affecting telescopic movement and stressing the housing bottom
Solution Approach 1:
The force transmission path is segmented into separate functional paths: the guide members handle only guiding and telescopic movement, while a dedicated mounting plate handles force and torque transmission to the housing, eliminating the conflict between guiding and force transmission functions
Solution Approach 2:
The mounting plate serves as an intermediary element between the spindle nut and the housing, providing a dedicated interface for force and torque transmission without involving the guide members, thus protecting the telescopic movement from torque loads
2Strength
If the third member is secured to the housing by welding, then the connection is rigid and can withstand forces, but it puts stress on the bottom of the housing
Solution Approach 1:
The force transmission function is extracted from the guide structure and relocated to a separate mounting plate, so the guide members no longer need to transmit forces to the housing, eliminating the stress concentration on the housing bottom
Solution Approach 2:
The mounting plate acts as an intermediary that distributes forces over a larger area of the housing bottom, reducing stress concentration compared to the direct welding connection of the third member
3Ease of manufacture
If the second member is loose in the nonsynchronous lifting column, then the structure is inexpensive to manufacture, but the second member can be caught and suddenly drop back causing loud noise and unreliable operation
Solution Approach 1:
The guide members are pre-configured with precise tolerances and surface finishes to prevent catching and binding, and the synchronous operation ensures smooth, controlled movement that prevents sudden drops and noise
Solution Approach 2:
The lifting column transitions from a loose, nonsynchronous design to a synchronous design where the guide members maintain precise relative positions during movement, ensuring controlled and reliable operation throughout the entire travel range
Data Source
AI summary
A lifting column, preferably for height-adjustable tables comprises a guide with three mutually telescopic members (1,2,3) and a motor driven spindle unit for bringing about the movement. The second member (2) of the guide is with a lower end secured to a lower end of the second spindle (6). The second spindle nut (8) co-operating with the second spindle (6) is with a bearing (18) with a rigid connection (28) fixed to a shaft stub (16) secured to an upper end of a drive tube (9). The shaft stub (16) is via a second bearing (20) secured to a mounting plate (23), by means of which the spindle unit is secured in the lifting column. Thus, the vertical load on the lifting column is led through the spindle unit around the guide (1,2,3). This enables a better and more optimum dimensioning of the guide (1,2,3) and the spindle unit, just as it is advantageous in terms of assembly and not least it enables a better implementing of a squeeze protection in the lifting columns.