Spring Mechanism for Power Tool Contact Wear Reduction
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Solution Overview
Problem
Handheld power tools experience abrasion and burnoff of contact elements due to vibrations and shocks, leading to reduced performance and reliability, especially when high current intensity is involved.
Innovation Solution
Incorporating a spring mechanism that guides and presses the contact means against the power supply unit, reducing unwanted motion and wear, and utilizing a leaf spring for enhanced stability and ejection functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact means is made movable relative to the electric unit to accommodate vibrations and shocks, then the reliability of electrical connection is improved, but wear and burnoff of contact elements increases
Solution Approach 1:
The patent applies beforehand cushioning by introducing a damping element between the contact means and the electric unit housing. This damping element is positioned in advance to absorb and attenuate vibrations and shocks before they reach the contact means, thereby protecting the contact elements from excessive motion and reducing wear and burnoff while maintaining reliable electrical connection during operational vibrations
2Adaptability or versatility
If clearance is provided for the contact means to move relative to the electric unit, then the ability to accommodate vibrations is improved, but unwanted motion and instability increase
Solution Approach 1:
The patent applies dynamics by creating a dynamic suspension system for the contact means using the damping element. The contact means is coupled to the housing through the damping element, allowing controlled dynamic motion during vibrations while maintaining stability during static conditions. This dynamic coupling enables the system to adapt to vibrational inputs without excessive unwanted motion
3Reliability
If the contact means is pressed against the power supply unit with high force, then electrical connection reliability is improved, but wear and burnoff of contact elements increases
Solution Approach 1:
The patent applies the intermediary principle by introducing the damping element as a mediator between the contact means and the housing. This intermediary component absorbs high-frequency vibrations and shock impulses, filtering out the harmful components that cause contact element wear while allowing the contact means to maintain stable pressure against the power supply unit for reliable electrical connection
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 solution effectively reduces wear and burnoff of contact elements, enhances stability during vibrations and shocks, and allows for a compact design by using the spring as both a guiding and ejection mechanism, improving the overall performance and longevity of the power tool.
Implementation Method 1
the means is formed at least by a spring
Implementation Method 2
By means of a force exerted on the power supply unit by the contact means, a further force, which has a tendency to put the power supply unit and the contact means out of contact with each other can be counteracted
Data Source
AI summary
An electric device has an electric unit having a receiving region, a power supply unit received by the receiving region of the electric unit in a receiving direction, contact units for making an electrical connection between the power supply unit and said electric unit, unit for counteracting a motion of the contact units, which is movable relative to the electric unit in the receiving direction, relative to the power supply unit located on the receiving region, and within a region intended for the motion.