Foldable Light Tower 4-Bar Linkage Single Actuator
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Solution Overview
Problem
Existing extendable mechanisms for folding light towers are complex and expensive, requiring at least two actuators for full vertical extension, which increases manufacturing complexity and cost.
Innovation Solution
A folding tower system utilizing a 4-bar linkage mechanism with one actuator and pre-loaded spring elements to achieve full vertical extension, allowing for a nested retracted configuration and faster deployment than traditional mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional extendable mechanisms are used with at least two actuators, then full vertical extension is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The mechanism is divided into two lift arms (lower and upper) connected by a 4-bar linkage, with each segment performing a specific function in the extension sequence. The lower lift arm extends first, followed by the upper lift arm, achieving full vertical extension through segmented action rather than requiring multiple actuators working simultaneously.
Solution Approach 2:
The 4-bar linkage mechanism dynamically transitions the system from a retracted horizontal configuration to an extended vertical configuration through rotational movement. The mechanism automatically sequences the extension of lower and upper lift arms through its dynamic properties, eliminating the need for multiple actuators while maintaining full vertical extension capability.
2Productivity
If traditional extendable mechanisms are used, then vertical extension is achieved, but deployment time increases
Solution Approach 1:
Spring elements are pre-loaded at the joints of the lift arms to store potential energy. During deployment, these springs automatically activate to remove play and facilitate smooth rotational movement, enabling faster deployment without requiring complex control mechanisms or additional actuators.
Solution Approach 2:
The 4-bar linkage acts as an intermediary mechanism that couples the motion of the lower and upper lift arms. This intermediary structure enables coordinated extension and retraction movements, achieving rapid deployment while maintaining a relatively simple overall mechanism structure.
3Stability of the object's composition
If spring elements are added to pre-load joints, then stability and play removal are improved, but device complexity increases
Solution Approach 1:
The spring elements are integrated into the existing joint structures of the lift arms, using the same space and connection points already present in the mechanism. This self-service approach adds stability and removes play without requiring separate mounting structures or significantly increasing the overall component count.
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 solution reduces complexity and cost by using a single actuator and spring-loaded joints, enabling faster deployment and increased stability, while maintaining the same footprint as existing systems, thus addressing the complexity and expense issues of traditional systems.
Implementation Method 1
Spring elements are used to pre-load the hinges or joints of the tower and help to remove play and movement when the tower is unfolded/during the vertical extension process
Implementation Method 2
A folding tower system utilizes a 4-bar linkage mechanism with one actuator and pre-loaded spring elements to achieve full vertical extension
Implementation Method 3
The first support strut can have a first ball joint rotationally connected to one side of the base and a second ball joint rotationally connected to one side of the upper lift arm
Data Source
Figure 1A~1B
Figure 1C
Figure 2A
AI summary
A folding light tower is provided that utilizes a 4-bar linkage mechanism which enables full vertical extension of the tower with the use of one actuator. The exemplary tower generally includes a base, a lower lift arm, and an upper lift arm. Spring elements are used near the rotating joints of the lower lift arm and upper lift arm of the tower. The spring elements act to preload the joints and help to remove play and movement when the tower is unfolded/during the vertical extension process.