Hand Tool Counterweight Movable Mounting Assembly
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Solution Overview
Problem
The complex installation of counterweights in hand tools, such as rotary hammers and saws, particularly when connected to wobble bearings, complicates the manufacturing process and increases costs.
Innovation Solution
The counterweight is designed to be movably mounted coaxially or parallel to the translation axis using a guide means like a guide rail or bushing, allowing for easier assembly and integration with the hand tool, potentially preassembled and lubricated, and connected via a wobble finger or guide rod for space-efficient and facilitated installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the counterweight is connected to the wobble bearing, then the forces caused by the back-and-forth movement can be compensated, but the assembly becomes laborious and complex
Solution Approach 1:
The counterweight assembly is segmented into separable components: the counterweight itself, the guide element, and the wobble finger connection. This allows the counterweight to be assembled independently and then integrated into the tool, reducing overall assembly complexity while maintaining force compensation functionality
Solution Approach 2:
A guide element is introduced as an intermediary component between the counterweight and the tool housing. This guide element simplifies the mounting process by providing a predefined path and connection interface, reducing the labor required for assembly while ensuring proper force compensation
2Volume of moving object
If the counterweight is mounted in a bushing with opening for wobble finger engagement, then space is saved within the housing, but the assembly process requires precise alignment
Solution Approach 1:
The guide element is designed with features that create self-aligning conditions during assembly. The guide rails and engagement openings are positioned to naturally guide components into correct alignment, reducing the precision requirements for manual assembly while achieving compact space utilization
3Ease of manufacture
If the counterweight is pre-assembled and pre-lubricated, then the manufacturing process is simplified, but additional assembly steps are required
Solution Approach 1:
The counterweight and guide element are pre-assembled and pre-lubricated as a unit during manufacturing. This preliminary action simplifies the final tool assembly process by reducing the number of separate components that need to be handled and assembled, ultimately reducing total assembly steps despite the initial pre-assembly requirement
Data Source
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AI summary
The invention relates to a hand tool, in particular a rotary hammer, a demolition hammer, or a reciprocating saw. The hand tool has a drive with a stroke-generating element, wherein the drive is configured to move the stroke-generating element back and forth along a translational axis. The hand tool has at least one counterweight, wherein the counterweight is operatively connected to the drive in such a way that forces caused at least indirectly by the back-and-forth movement can be at least partially compensated. According to the invention, the counterweight of the hand tool is mounted to be movable coaxially or parallel to the translational axis, in particular to be mounted to be movable back and forth.