Fence Post Puller Jack Platform Stability

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Solution Overview

Problem

Existing fence post extraction methods are inefficient and prone to instability in soft ground conditions, as they lack effective mechanisms to securely lift and remove posts without sinking or causing damage.

Innovation Solution

A fence post puller system featuring a lift plate with a chain and bottle jack mechanism, where the bottle jack is secured to a jack platform that disperses its load over a large surface area, allowing for stable extraction using a hoist arm and bracket arms to attach securely to the bottle jack, and a chain with a hook for auxiliary lifting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional fence post extraction method is used, then the process is simple, but it causes instability and sinking in soft ground conditions

Engineering Contradiction:
Improvestability in soft groundVSAvoidextraction system complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The extraction system is divided into separate functional components: a jack platform for ground distribution, a bottle jack for lifting force, and a hoist arm with bracket arms for post engagement. This segmentation allows each component to be optimized for its specific function while working together to solve the stability problem in soft ground conditions.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The jack platform acts as an intermediary between the ground and the bottle jack, distributing the lifting force over a large surface area to prevent sinking in soft ground. This intermediary component mediates the interaction between the extraction mechanism and the unstable ground, ensuring reliable operation.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Reliability

If a small contact area jack is used, then the device complexity is low, but it sinks into unstable soil and causes extraction failure

Engineering Contradiction:
Improveextraction success rateVSAvoidjack platform surface area
Core Design Contradiction:
ReliabilityVSArea of stationary object

Solution Approach 1:

The solution transitions from a point-contact jack to a distributed surface platform, spreading the lifting force across a two-dimensional area. This dimensional change from zero-area contact to large-area contact prevents sinking in soft ground while maintaining extraction effectiveness.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

3Productivity

If manual pulling methods are used, then no mechanical equipment is needed, but the extraction efficiency is low and posts may be damaged

Engineering Contradiction:
Improveextraction efficiencyVSAvoidmechanical equipment requirement
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The bottle jack utilizes hydraulic principles to generate substantial lifting force through fluid pressure. This hydraulic mechanism provides high extraction efficiency and controlled force application, enabling rapid post removal without damage while minimizing the need for heavy mechanical equipment.

Inventive Principle:
Principle #29Pneumatics and hydraulics

4Adaptability or versatility

If a fixed jack position is used, then the setup is simple, but it cannot adapt to unstable or varying ground conditions

Engineering Contradiction:
Improveground condition adaptabilityVSAvoidadjustable components
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The jack platform incorporates adjustable elements that allow the system to adapt its configuration to different ground conditions and post positions. This dynamic adjustability enables the extraction system to maintain stability and effectiveness across varying operational conditions without requiring completely different equipment for each scenario.

Inventive Principle:
Principle #15Dynamics

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

Enables efficient and stable extraction of fence posts from the ground, preventing sinking and damage, with the ability to handle unstable soil conditions and provide versatile lifting options.

Implementation Method 1

The bottle jack is affixed to a jack platform that disperses across a large surface area so as not to sink in an unstable ground or soil environment

Methodology Applied
Scientific EffectHydraulic pressure: Hydraulic Press

Implementation Method 2

The jack platform includes a pair of adjustable bolts and nuts that secure a base of the bottle jack to a top surface of the jack platform

Methodology Applied
Scientific EffectPressure distribution: Pascal's Law

Data Source

PatentUS9556642B1Fence post puller
Publication Date: 2017.01.31 GIBSON SAM
  • US9556642B1 patent drawing
  • US9556642B1 patent drawing
  • US9556642B1 patent drawing

AI summary

The fence post puller is a system that is adapted to extract a fence post from a ground. The fence post puller includes a lift plate that is used to extract said fence post, and a chain that is optionally used to force the fence post out of the ground via auxiliary means. The lift plate also includes a lift hole that is selectively attached to a hoist arm. The hoist arm is attached to a bottle jack, which is used to raise the lift plate and fence post. The bottle jack is affixed to a jack platform that disperses across a large surface area so as not to sink in an unstable ground or soil environment.