Side Handle Breakaway Mechanism for Power Tools
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Solution Overview
Problem
Side handles for hand-held power tools, such as electric screwdrivers or hammer drills, often feature dampers with elastic rods that can tear under constant stress, leading to sudden detachment and potential user injury.
Innovation Solution
A side handle design incorporating a damper with elastic rods anchored in shells and a breakage device featuring pins with recesses and heads, which allows for controlled deflection and prevents sudden detachment by engaging only when the rods fail, ensuring safety during use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic rods are used in the damper to absorb vibrations, then vibration damping performance is improved, but the risk of sudden detachment increases when rods tear under constant stress
Solution Approach 1:
The breakage device is pre-installed in the damper structure to provide protective cushioning before rod breakage occurs. When elastic rods tear under constant stress, the breakage device engages to prevent sudden detachment of the handlebar, cushioning the harmful effect and protecting the user from injury while maintaining vibration damping functionality.
2Device complexity
If the damper structure is simplified to reduce complexity, then manufacturing cost decreases, but safety protection against rod breakage is reduced
Solution Approach 1:
The damper structure is segmented into functional components: elastic rods for vibration damping, shells for structural support, and a breakage device with pins and heads for safety protection. This segmentation allows each component to perform its specific function independently, maintaining relatively simple overall structure while adding necessary safety features through modular design.
3Strength
If the pin is always in contact with the shell for secure engagement, then connection strength is improved, but the damper cannot deflect freely under load
Solution Approach 1:
The pin engagement with the shell is designed to be dynamic rather than static. Under normal operation, the pin remains engaged behind the shell to provide connection strength. When the damper needs to deflect under load, the pin can move相应地, allowing controlled deflection while maintaining safety protection against excessive movement and rod breakage.
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 provides enhanced safety by preventing sudden detachment of the handlebar from the attachment mechanism, allowing the user to continue using the power tool safely even if the elastic rods break, reducing the risk of injury.
Implementation Method 1
The damper consists of several elastic rods that flex under a force applied laterally to the handlebar
Implementation Method 2
a damper which is arranged along the handle axis between the handle bar and the fastening mechanism
Data Source
AI summary
A side handle 1 has a handle 2 arranged along a handle axis 7 for holding the side handle 1 with one hand, a fastening mechanism 3 for releasably attaching the side handle 1 to a hand-held power tool, and a damper 6 arranged along the handle axis 7 between the handle 2 and the fastening mechanism 3. A break-away device 27 is arranged parallel to the damper 6 between the handle 2 and the fastening mechanism 3. The break-away device 27 has a first shell 20 connected to the handle 2, a second shell 21 connected to the fastening mechanism 3, and at least one pin 28 oriented along the handle axis 7.One end 30 of the pin 28 is anchored in one of the shells 20 and another end 28 of the pin 28 engages behind the other of the shells 21 on a side 33 facing away from one of the shells 20, wherein the pin 28 is arranged without contact to the other shell 20 when the damper 6 is unloaded.