Adjustable Handle Mechanism for Percussion Tools
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Solution Overview
Problem
Existing hand-held percussion tools require cumbersome adjustments of handle height, risking inconsistent settings, potential operator entrapment, and dirt ingress due to loose screw connections and protruding linkage, leading to operational discomfort and reliability issues.
Innovation Solution
The handles are designed for sliding adjustment with a guide on the drive arrangement, featuring a fixed connection and locking mechanism, ensuring consistent height and secure grip, while a vibration-reducing intermediate carrier maintains operational stability and prevents dirt ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If screw connections are used to adjust handle height, then the handles can be positioned at different heights, but the adjustment process becomes cumbersome and requires tools
Solution Approach 1:
The handle mounting system transitions from a static screw-fixed configuration to a dynamic sliding mechanism. The handles can slide along the drive arrangement housing and are locked into position using a simple latch mechanism, allowing easy adjustment without tools while maintaining secure positioning.
Solution Approach 2:
The adjustment mechanism is extracted from the traditional screw-threaded system. Instead of requiring threaded holes and screwdrivers, the patent uses a dedicated sliding groove with integrated locking lugs that engage with corresponding features on the handle, eliminating the need for external adjustment tools.
2Adaptability or versatility
If multiple screw connections are used for handle adjustment, then the handles can be secured at different positions, but the risk of inconsistent handle height increases
Solution Approach 1:
The patent merges the adjustment and locking functions into a single integrated mechanism. The sliding groove and locking lugs work together as one system, ensuring that both handles are adjusted and secured simultaneously at the same position, eliminating the risk of inconsistent handle heights that occurs with separate screw connections.
3Adaptability or versatility
If a retaining linkage protrudes through the protective housing, then the handles can be adjusted, but the operator may become trapped or dirt may penetrate
Solution Approach 1:
The adjustment mechanism is nested within the protective housing structure. The sliding groove is formed as an integrated feature of the housing, and the locking lugs are positioned within recesses in the housing, eliminating protruding elements that could trap operators or allow dirt ingress while maintaining full adjustability.
4Reliability
If screw connections are used for handle fixation, then the handles can be secured, but the adjustment process takes time
Solution Approach 1:
The static screw-fixing process is replaced with a dynamic sliding and latching mechanism. The handles slide smoothly along the groove and lock into position with a simple latch action, reducing adjustment time from the time required to loosen and tighten screws to merely sliding and latching.
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
This solution allows for easy, tool-free adjustment of handle height, ensuring consistent grip and reduced vibrations, enhancing operator comfort and tool reliability by eliminating the need for multiple screw connections and reducing manufacturing costs.
Implementation Method 1
The vibration-reducing suspension can be formed by spring elements, for example. This makes it possible, in addition to the adjustability of the handle height, to also ensure low-vibration operation of the hand-held power tool.
Data Source
AI summary
The apparatus (2) has a drive arrangement (10) for striking admission of a tool retainer (20) along an operating direction (R), and an outer housing (8) in which the drive arrangement is partially accommodated. Two adjustable handles (30) are provided at sides (26, 28) of the outer housing and are fixed in different positions for adjusting the gripping height (H) opposite to the tool retainer. The handles are movably supported between a number of positions opposite to the tool retainer, and are fixed in the selected position. A guide for the handles is provided at the drive arrangement.