Power Tool Locking Device With Matched Sleeves for Wear Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hand-held power tools face issues with wear resistance in their locking mechanisms, limiting their service life and compatibility with more powerful tools.
Innovation Solution
A hand-held power tool design featuring a tubular tool holder with a spring-loaded pressure sleeve and stop sleeve, where the pressure sleeve and stop sleeve have matching contact surfaces to enhance wear resistance, allowing the tool to be used in more powerful applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional locking mechanisms are used in hand-held power tools, then the device can be operated, but the locking mechanism suffers from high wear resistance issues that limit service life
Solution Approach 1:
The patent applies local quality by providing contact surfaces on the stop sleeve and pressure sleeve that are specifically designed with enhanced properties (harder material or surface treatment) only at the regions where contact with locking elements occurs. This localized enhancement of surface properties increases wear resistance precisely where it is needed, without requiring the entire tool receiver to be made from more expensive or heavier materials, thereby extending service life while maintaining reliability.
2Power
If the locking mechanism is designed for higher power applications, then the tool can handle more powerful insert tools, but the wear on the locking mechanism increases significantly
Solution Approach 1:
The patent applies parameter changes by modifying the physical properties of the contact surfaces through surface hardening treatments or by using materials with different hardness parameters. The contact surfaces are designed with specific hardness values that allow them to withstand higher contact pressures and forces generated by more powerful insert tools, while the matching contact surfaces on both the stop sleeve and pressure sleeve distribute the load to minimize wear through controlled material properties.
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 enhanced wear resistance extends the service life of the tool receiver and enables its use in more powerful hand-held power tools by reducing wear and improving the locking mechanism's reliability.
Implementation Method 1
a spring-loaded pressure sleeve pressing the at least one locking element in a locking position against the stop sleeve
Data Source
AI summary
A hand-held power tool includes a tool receiver with a tubular tool holder and an assigned locking device. The assigned locking device includes a locking element configured to lock an insert tool in the tubular tool holder, a pressure sleeve that is spring-loaded via an assigned spring element, and a stop sleeve, the spring-loaded pressure sleeve configured to press the locking element in a locking position against the stop sleeve. The tubular tool holder includes at least one recess in which the locking element in the locking position is located, at least portionally. The stop sleeve has, on its inner circumference, at least one contact surface that is matched to an outer contour of the locking element such that a first surface contact between the at least one contact surface and the locking element is established in the locking position.