Extendable Drilling Tool Piston Mechanism
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Solution Overview
Problem
Existing extendable drilling tools are overly complex and lengthy due to the need for multiple kinematic options and components like compression springs and fluid management systems, which complicate their design and hinder their integration into head tools.
Innovation Solution
A compact extendable drilling tool design featuring a piston with a bearing surface forming a non-zero angle with the longitudinal axis, allowing arms to move radially and longitudinally with a single rib guiding mechanism, eliminating the need for compression springs and fluid management systems, and utilizing the lower edge of the casing for arm retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple kinematic options and components (compression springs, fluid management systems) are used to enable arm movement, then the tool can achieve extended functionality, but the device complexity increases significantly
Solution Approach 1:
The patent removes compression springs and fluid management systems from the tool structure, extracting only the essential mechanical components needed for arm movement. This simplifies the overall device while maintaining the core functionality of arm extension and retraction.
Solution Approach 2:
Instead of using complex mechanisms to push arms outward, the invention uses the lower edge of the casing to push arms inward for retraction. This inverted approach simplifies the retraction mechanism by utilizing the existing casing structure rather than adding separate retraction mechanisms.
2Ease of operation
If compression springs and fluid management systems are included in the tool design, then arm retraction and extension functions are achieved, but the tool length increases
Solution Approach 1:
The patent extracts and removes compression springs and fluid management systems from the tool design, eliminating the need for additional length to accommodate these components while preserving the essential arm retraction and extension functions through simplified mechanical means.
Solution Approach 2:
The lower edge of the casing serves multiple functions: it provides structural support for the tool and simultaneously acts as the retraction mechanism for the arms. This multi-functionality eliminates the need for separate retraction components, reducing overall tool length.
3Manufacturing precision
If multiple ribs and grooves are provided to guide arm movement, then the arms can move with minimum play, but the manufacturing complexity increases
Solution Approach 1:
The patent extracts and removes unnecessary ribs and grooves from the tool design, retaining only the essential guiding features needed for arm movement. This reduction in guiding features simplifies manufacturing while maintaining sufficient arm guidance accuracy through the optimized bearing surface geometry.
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 design simplifies the tool's structure, reduces length, and enhances its compactness, allowing for efficient arm movement and integration into head tools without the need for additional mechanisms, thereby improving drilling efficiency and tool stability.
Implementation Method 1
the piston moves translationally upward and exerts a longitudinal force on the arms that is oriented upward. Because of this force, each arm moves translationally longitudinally upward and radially toward the outside of the body.
Data Source
AI summary
An extendable drilling tool, the extendable tool moving in a drilling direction and including a body with a longitudinal axis and at least one arm that is mobile relative to the body in a direction of movement that forms a first angle with the longitudinal axis that is non-zero, less than 45°, and open upstream according to the direction of drilling. The extendable tool includes a piston that is mobile in a direction parallel to the longitudinal axis, the piston being located downstream according to the direction of drilling relative to the arm, the piston including at least one bearing surface that works with at least one arm and that forms with the longitudinal axis a second angle that is non-zero, less than 90°, and open downstream according to the direction of drilling.