Stump Pulling Apparatus Pneumatic Clamping Force
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Solution Overview
Problem
Existing stump pulling apparatuses using compression springs face limitations in providing sufficient clamping force for larger stumps, require adjustments for varying stump sizes and soil conditions, and suffer from maintenance challenges due to spring fatigue and replacement needs.
Innovation Solution
A stump pulling apparatus utilizing a displacement cylinder instead of springs, which provides improved clamping force through a pneumatically charged system that dynamically controls the compressive force applied to the stump-engaging wheels, allowing for increased force generation with less physical displacement and easier maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If compression springs are used to provide clamping force, then the apparatus can remove moderately-sized stumps, but the clamping force is insufficient for larger diameter stumps
Solution Approach 1:
The patent replaces the mechanical compression spring system with a gas pressure system. A gas reservoir stores compressed gas that can be released to actuate a piston, which in turn actuates a cable to apply clamping force to the stump-engaging wheels. This substitution allows for much higher force generation in a more compact form factor, enabling the removal of larger diameter stumps without increasing the overall apparatus size.
Solution Approach 2:
The patent employs pneumatic principles by using compressed gas stored in a gas reservoir to generate and transmit force. The gas pressure actuates a piston that converts the stored pneumatic energy into mechanical motion, which is then transmitted through a cable to apply clamping force to the wheels. This pneumatic system provides high force density and can be compactly integrated into the apparatus.
2Adaptability or versatility
If compression springs are used, then the apparatus can provide clamping force, but adjustment for varying stump sizes and soil conditions requires removing and replacing springs
Solution Approach 1:
The patent implements a dynamic adjustment system where the user can control the clamping force by operating a valve that regulates gas flow from the reservoir to the piston. This allows continuous adjustment of the clamping force to match varying stump sizes and soil conditions without requiring physical replacement of components. The system transitions from a static spring force to a dynamically controllable pneumatic force.
Solution Approach 2:
The patent enables parameter adjustment by changing the gas pressure delivered to the piston through valve control. By regulating the amount and pressure of gas released from the reservoir, the system can vary the clamping force output to adapt to different operating conditions. This parameter-based control is much easier than physically replacing springs with different specifications.
3Reliability
If compression springs are used to provide clamping force, then the apparatus functions for stump removal, but the springs breakdown and fatigue with time requiring periodic replacement
Solution Approach 1:
The patent replaces the mechanical spring system with a pneumatic system consisting of a gas reservoir, valve, and piston. Compressed gas serves as the energy storage medium instead of mechanical springs, eliminating the fatigue and breakdown issues inherent in spring systems. The pneumatic components are generally more durable and require less maintenance.
Solution Approach 2:
The gas reservoir can be refilled or repressurized relatively easily, allowing the system to restore its clamping force capability without requiring complex repairs. This self-service aspect improves maintainability compared to spring replacement, which requires disassembly and specialized tools.
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 the removal of stumps with diameters up to 23 inches and beyond, offers adjustable force based on conditions, and simplifies maintenance by eliminating the need for spring replacement and adjustment, improving efficiency and usability.
Implementation Method 1
A displacement cylinder provides a forwardly-acting force on the rear segment that pivots the pair of arms toward each other
Data Source
AI summary
A stump pulling apparatus comprises a frame, a pair of arms, a pair of stump-engaging wheels, and a drawbar. The pair of arms are pivotally mounted to the frame. The pair of stump-engaging wheels are each rotatably mounted on the pair of arms at a rear end of the corresponding one of the pair of arms. The drawbar includes a front segment, configured to engage the vehicle for towing the stump pulling apparatus and slidably coupled to the rear segment, a rear segment coupled to each of the pair of arms, and a displacement cylinder coupled to and intermediately disposed between the front segment and the rear segment. When the front segment of the drawbar is pulled forward, the displacement cylinder provides a forwardly-acting force on the rear segment, which pivots the pair of arms toward each other, thereby forcibly bringing the stump-engaging wheels together.