Hand-Held Tool Attachment Axial Centering Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tool attachments for hand-held machine tools require significant radial and tangential play between the drive shaft and the tool holder to allow engagement, leading to inefficiencies in torque transfer and stability.
Innovation Solution
A tool attachment design featuring a drive shaft with a locking section and an actuating element that shifts the locking sleeve against a spring force, reducing play and enhancing axial centering and locking, while allowing for easy mounting and dismounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking sleeve is spring-loaded to engage the drive shaft, then the tool attachment can be securely locked, but significant radial and tangential play exists between the drive shaft and tool holder
Solution Approach 1:
The actuating element performs a preliminary action by shifting the locking sleeve axially against the spring force before the drive shaft engages with the tool holder. This preliminary shifting action opens the locking engagement in advance, allowing the drive shaft to be inserted with minimal play, and only after proper positioning does the spring reload the locking sleeve to secure the connection.
Solution Approach 2:
The locking system transitions from a static spring-loaded engagement to a dynamic system where the locking sleeve can be temporarily displaced axially by the actuating element. This dynamic capability allows the system to switch between locked and unlocked states, enabling play reduction during engagement while maintaining secure locking during operation.
2Manufacturing precision
If the locking sleeve is constantly engaged to reduce play, then precision is improved, but the tool attachment cannot be easily mounted or dismounted
Solution Approach 1:
The spring element automatically reloads the locking sleeve after the actuating element shifts it axially, creating a self-service mechanism. The spring's stored energy automatically returns the locking sleeve to its engaged position after mounting, eliminating the need for manual intervention to maintain the precision locking state while preserving easy mounting capability.
Solution Approach 2:
The locking sleeve undergoes periodic action, alternating between being shifted axially by the actuating element during mounting/dismounting and being spring-loaded into engagement during operation. This periodic switching between displaced and engaged states allows the system to achieve both easy operation and precision when needed.
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 achieves a secure, zero-play fixation of the tool attachment on the hand-held machine tool, improving torque transfer efficiency and stability without increasing the overall length or complexity of the attachment.
Implementation Method 1
a first locking sleeve preloaded by a first spring element in an axial direction pointing away from the hand-held machine tool
Implementation Method 2
An actuating element is provided which is designed, upon mounting the tool attachment on the hand-held machine tool, to shift the first locking sleeve in the direction of the hand-held machine tool against a spring force applied by the first spring element
Data Source
AI summary
A tool system having a hand-held machine tool including a tool holder for receiving an insert tool; and a mounting interface configured for mounting thereon: an angle attachment that includes an angle locking section for locking on the mounting interface and an angle drive unit; and an eccentric attachment that includes an eccentric locking section for locking on the mounting interface and an eccentric drive unit.