Eccentric Auger Shaft Compacts Soil Walls

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Solution Overview

Problem

Existing augers for digging post holes generate loose soil that requires additional labor to remove and compact, leading to instability and increased time in the digging process.

Innovation Solution

An auger with an elongated shaft and tapered end that rotates eccentrically, pushing soil outward to form holes without helical flighting, minimizing loose soil generation and compacting the hole walls as it digs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a helical flighted auger is used to dig post holes, then the auger effectively produces a hole, but it leaves loose soil at the bottom of the hole and spatters soil at the top surrounding the hole

Engineering Contradiction:

Improvehole digging efficiencyVSAvoidloose soil generation

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The invention extracts and removes the helical flighting component from the auger design. By taking out the flighting that causes soil to be scraped and deposited as loose material, the patent eliminates the harmful effect of loose soil generation while retaining the core drilling function through the tapered shaft's pushing action

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of using helical flighting to scrape and convey soil outward (conventional approach), the invention inverts the mechanism by using a smooth tapered shaft that pushes soil inward and downward, compacting it into the hole rather than generating loose soil around it

Inventive Principle:

Principle #13The other way round (Inversion)

2Productivity

If helical flighting is used to excavate the post hole, then the hole is formed effectively, but the cutting action disturbs the stability of the hole wall and leaves it subject to crumbling and degradation

Engineering Contradiction:

Improvehole formation efficiencyVSAvoidhole wall stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The invention removes the helical flighting that causes disturbance to the hole wall through its scraping and cutting action. By extracting this component, the patent eliminates the source of wall instability while maintaining hole formation capability through the tapered shaft's pushing mechanism

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention converts the harmful cutting action of helical flighting into a beneficial compacting action. The smooth tapered shaft pushes soil inward and downward, compacting it against the hole walls to enhance stability rather than disturb it

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If loose soil is removed by hand or compacted directly in place to achieve proper compaction, then the post hole becomes stable, but the process is very time consuming and labor intensive

Engineering Contradiction:

Improvepost hole stabilityVSAvoidtime for soil removal and compaction

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The invention merges the hole digging function with the soil compacting function into a single integrated operation. The smooth tapered shaft performs both tasks simultaneously by pushing soil inward and downward during rotation, eliminating the need for separate removal and compaction steps

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The auger design enables the soil to be compacted automatically during the digging process itself. The pushing action of the tapered shaft naturally compacts the soil into the hole as it is being formed, making the system self-sufficient without requiring additional manual intervention

Inventive Principle:

Principle #25Self-service

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 auger effectively reduces loose soil generation and compacts the hole walls during digging, reducing post installation time and enhancing hole stability.

Implementation Method 1

The lateral surface of the shaft body is without helical flighting elements such that the ground in which the auger is inserted is effectively pushed outwardly to form the post hole

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Implementation Method 2

The elongated shaft has a central longitudinal axis of the auger offset from the axial line of engagement with the rotational driving source of the mechanized implement to which it is connected. This configuration causes the auger to rotate in an eccentric rotational orbit

Methodology Applied

Scientific EffectEccentric motion: Eccentric

Implementation Method 3

It is another embodiment of the present invention to provide an auger that imparts a compacting action against the post hole wall as the post hole is dug

Methodology Applied

Scientific EffectMechanical Compression: Compression

Data Source

PatentUS8820435B2Auger for digging holes

Publication Date: 2014.09.02 DANUSER

AI summary

An auger for digging holes that minimizes the amount of loose dirt excavated in and around the dug hole. The auger comprises an elongated shaft body whose axial longitudinal center is disposed in a parallel offset position from the axial engagement line of orientation with the driving source for rotationally driving the auger. The shaft body of the auger revolves in an eccentric lateral orbit as the auger rotates which digs the hole by pushing and widening the dirt in the hole rather than cutting and scraping. The distal end of the auger has a tapered configuration for initial penetration into the ground. The eccentric movement of the shaft body of the auger helps to compact the walls of the hole being dug.