Chuck Damping Mechanism for Hammer Drill Recoil
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Solution Overview
Problem
Hammer drills and chiseling power tools often experience a 'empty strike' recoil after lifting off a substrate, leading to potential user and tool stress due to the lack of effective damping mechanisms for automatic switch-off.
Innovation Solution
A chuck design featuring a concentric holding sleeve with a locking element and sliding block that converts translational movement into rotational energy, utilizing a helically or skewed sliding block to prevent recoil by dissipating impact energy and maintaining the tool in an extended position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tool is extended out of the chuck to maximum extent for automatic switch-off, then the switch-off function is triggered, but the tool can ricochet off the stop and retract back into the chuck causing empty strike
Solution Approach 1:
The patent introduces a damping mechanism that absorbs impact energy before the tool can ricochet and cause empty strike. The damping element is positioned to cushion the tool's movement when it extends and contacts the stop, preventing the harmful recoil effect while maintaining the automatic switch-off function.
Solution Approach 2:
The patent converts the harmful impact energy from empty strike into useful damping action. By positioning the damping mechanism to engage during the tool's extension movement, the previously harmful ricochet energy is transformed into a beneficial cushioning effect that stabilizes the tool position and prevents recoil.
2Object-affected harmful factors
If damping mechanism is added to prevent empty strike, then recoil is reduced, but device complexity increases
Solution Approach 1:
The patent merges the damping function with existing chuck components rather than adding completely separate damping mechanisms. The damping element is integrated into the chuck's structural framework, combining the support function with the damping function to reduce overall device complexity while still preventing empty strike.
Solution Approach 2:
The damping mechanism is designed to serve multiple functions: it dampens empty strike, provides structural support during tool extension, and maintains the tool's positional stability. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device complexity.
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 prevents recoil by converting impact energy into rotational energy, ensuring the tool remains extended and reducing the risk of accidental retraction, thereby enhancing user safety and tool stability during automatic switch-off.
Implementation Method 1
The sliding block forces at least one component of the power tool to rotate relative to the tool, as a result of which at least some of the impact energy is converted into rotational energy
Implementation Method 2
The chirality of the sliding block prevents recovery of the rotational energy for a return movement of the tool back into the power tool
Implementation Method 3
A locking element of the chuck protrudes partially into the holding sleeve so as to engage with the locking groove
Data Source
AI summary
A chuck for a chiseling power tool has a holding sleeve that is arranged concentrically with respect to a working axis and that serves to receive one shank end of a tool having a locking groove. A locking element protrudes partially into the holding sleeve so as to engage with the locking groove. A sliding block guides the locking element, whereby the sliding block has a section that is wound helically around the working axis.