Screwthreaded pole
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Solution Overview
Problem
Existing soil-insertable poles lack sufficient resistance to horizontal forces, causing them to lean or fall over due to inadequate soil engagement by their threaded portions.
Innovation Solution
A pole design featuring a lower tapered segment with double helical threads of varying lengths, where the first thread compacts the soil and the second thread bites into the compacted soil for enhanced grip, along with an intermediate tapered segment for further soil compaction, preventing cavitation and improving stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a single helical thread is used on the pole, then the pole can be inserted into the soil, but the pole cannot resist horizontal forces effectively
Solution Approach 1:
The single helical thread is divided into two separate helical threads with different characteristics. The first helical thread has a greater lead (extends outwardly a greater distance) for compaction, while the second helical thread has a smaller lead for biting into compacted soil. This segmentation allows each thread to perform a specific function, collectively providing both insertion capability and resistance to horizontal forces.
Solution Approach 2:
Different portions of the threaded section have different thread characteristics. The first helical thread portion is designed with a larger lead for soil compaction, while the second helical thread portion is designed with a smaller lead for gripping. This local differentiation of thread properties optimizes the pole's interaction with soil at different depths and locations.
2Stability of the object's composition
If the helical thread extends outwardly a greater distance for compaction, then soil compaction is improved, but the thread may cause cavitation or rough insertion action
Solution Approach 1:
The thread structure is segmented into two distinct helical threads with different leads. The first thread with greater lead provides compaction action, while the second thread with smaller lead provides smooth biting action. This segmentation allows the pole to achieve both effective soil compaction and smooth insertion without cavitation.
Solution Approach 2:
The dual helical thread structure creates a periodic action during insertion, where the first thread performs compaction in one rotational cycle and the second thread performs biting in the next cycle. This periodic alternation between compaction and biting actions ensures smooth overall insertion while achieving effective soil compaction.
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 pole effectively resists horizontal forces by creating a stable soil engagement, preventing leaning or falling, and ensuring a smoother insertion process.
Implementation Method 1
The first thread which extends outwardly a greater distance will tend to compact the soil between adjacent threads
Implementation Method 2
The second helical thread, which extends outwardly a lesser distance, will then tend to bite into the compact soil and reinforce the grip thereon
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A pole (30) which is designed to be inserted into the ground, the pole (30) having a lower tapered segment 14 at one end thereof, the lowered tapered segment 14 having double helical threads 18, 20 thereon, and an upper segment 12 upon which objects may be supported.