Handheld Power Tool Telescopic Rod Assembly for Adjustable Length
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Solution Overview
Problem
Portable handheld power tools, such as chainsaws and reciprocating saws, face limitations in adjusting their length to accommodate various cutting heights and user convenience, with existing tools being either too short or too cumbersome.
Innovation Solution
A handheld power tool design featuring a telescopic rod assembly that allows the tool to adjust between two working states, with a first effective length of up to 1 meter and a second effective length significantly longer, enabling greater versatility and convenience while maintaining a lightweight and compact form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the tool length is increased to satisfy high-position cutting, then the cutting height capability is improved, but the portability and flexibility deteriorate
Solution Approach 1:
The patent applies a telescopic rod assembly that allows the tool length to be dynamically adjusted between a first effective length (≤1m) and a second effective length (>1m). This dynamic length adjustment enables the tool to adapt to different working conditions - compact for portability and extended for high-position cutting, thereby resolving the contradiction between fixed length limitations and variable operational requirements
2Adaptability or versatility
If the tool is designed as a fixed short length for portability, then the lightweight and compact characteristics are improved, but the ability to cut at higher positions deteriorates
Solution Approach 1:
The telescopic rod assembly provides dynamic length adjustment, allowing the tool to transition from a compact first effective length (≤1m) suitable for portability to an extended second effective length (>1m) for reaching higher positions. This resolves the contradiction by making the effective length variable rather than fixed
3Length of moving object
If the tool is designed as a fixed long length for high-position cutting, then the cutting height capability is improved, but the convenience and flexibility deteriorate
Solution Approach 1:
The telescopic mechanism allows the user to adjust the effective length based on operational needs. For routine tasks requiring flexibility and ease of operation, the tool remains in the compact first effective length (≤1m). For high-position cutting tasks, it extends to the second effective length (>1m), thereby resolving the contradiction between fixed long length and operational convenience
Data Source
AI summary
A handheld power tool includes a motor, a handle having a first switch for starting and stopping the motor, an output assembly, and an adjustment device including a telescopic rod assembly. The length of the adjustment device changes so that the handheld power tool has at least first and second working states. The distance between the frontmost side of the handheld power tool and the rearmost side of the first switch is an effective length of the handheld power tool. When the handheld power tool is in the first working state, the handheld power tool has a first effective length T1. When the handheld power tool is in the second working state, the handheld power tool has a second effective length T2. The first effective length T1 is less than or equal to 1 m, and the second effective length T2 is greater than the first effective length T1.