Magnetic Trigger Control for Two-Speed Portable Drilling
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Solution Overview
Problem
Portable drilling tools face challenges in efficiently drilling through various aircraft materials due to differing cutting conditions, requiring multiple operations and high precision, which increases manufacturing costs and productivity issues, especially with manual drilling methods that lack flexibility in rotational frequencies and are prone to non-quality issues.
Innovation Solution
A portable electric drilling device with a trigger system allowing for adjustable rotational frequencies, featuring elastic return and magnetic attraction mechanisms for ergonomic and intuitive operation, enabling the user to choose between two predetermined frequencies and ensuring reliable and efficient drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pneumatic hand drills with single rotational speed are used, then the device is simple and portable, but it cannot adapt to different materials and drilling phases, resulting in reduced productivity and quality
Solution Approach 1:
The trigger mechanism is designed with dynamic characteristics, incorporating elastic return means and magnetic attraction means that create distinct operational zones (first zone with lower rotational speed, second zone with higher rotational speed). This allows the drilling device to adapt to different drilling phases and materials through a single portable device, resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The invention changes the rotational speed parameter based on the trigger position. When the trigger is in the first position, the motor operates at a first rotational speed suitable for certain materials or drilling phases. When the trigger is pulled to the second position, the rotational speed changes to a second speed suitable for other materials or phases, enabling one device to handle multiple drilling scenarios.
2Productivity
If a single rotational speed is used for all drilling operations, then the device is simple to operate, but it cannot optimize drilling parameters for different materials, leading to quality defects and reduced productivity
Solution Approach 1:
The trigger mechanism automatically provides the appropriate rotational speed based on the operator's input level. The elastic return means and magnetic attraction means create natural operational zones that guide the operator to select the appropriate speed without requiring complex controls or decisions, maintaining ease of operation while improving productivity.
3Manufacturing precision
If manual drilling with single speed is used, then equipment cost is low, but manufacturing precision and quality consistency deteriorate due to inability to optimize parameters for different materials
Solution Approach 1:
The dynamic trigger mechanism with elastic and magnetic components creates distinct operational zones that correspond to different drilling phases and material types. This allows consistent quality across different materials by providing optimized rotational speeds for each scenario, while maintaining a relatively simple control mechanism that does not require complex electronics or programming.
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 device provides flexible and high-quality drilling of multilayer elements with improved productivity by allowing operators to easily select and perceive the appropriate rotational frequency, reducing non-quality issues and costs associated with rework.
Implementation Method 1
first magnetic attraction means (20) opposing the movement of the trigger (17) between its intermediate position and its total actuation position
Implementation Method 2
elastic return means (22) opposing the movement of the trigger (17) from its rest position to its fully actuation position
Data Source
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AI summary
The present invention relates to a portable drilling or screwdriving device comprising at least: - an electric motor (11); - self-contained or wired means for supplying electricity to said motor (11); - an actuating trigger (17); - means for controlling said motor (11) according to the position of said trigger (17); said trigger (17) being movable between at least: - a rest position in which said motor (11) is at rest; - a fully activated position in which said motor (11) is driven by said control means according to a first predetermined rotational frequency; said trigger (17) can take a predetermined intermediate position in which it is located between said rest and activated positions and said motor (11) is driven by said control means according to a second predetermined rotational frequency.According to the invention, such a device includes elastic return means opposing the movement of said trigger (17) from its rest position to its fully actuation position, and first fixed magnetic attraction means opposing the movement of said trigger (17) between its intermediate position and its fully actuation position.