Self-aligning Tool Fitting Mounting via Star-shaped Insertion Aid
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Solution Overview
Problem
Existing hand-held power tools with replaceable tool fittings require precise alignment for detent engagement, making it difficult to quickly and easily mount or replace tool fittings without an actuation sleeve.
Innovation Solution
The design incorporates a hammer tube with profiled recesses and balls that automatically align and engage, facilitated by a compression spring and support ring, allowing the tool fitting to be slid onto the spindle without needing a specific rotation angle or actuation sleeve, utilizing fastening profiles and grooves for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tool fitting is secured to the output spindle using profiled bodies and profiled recesses in detent fashion, then the tool fitting is securely fixed axially, but the tool fitting requires precise rotation angle alignment for mounting
Solution Approach 1:
The tool fitting automatically finds its correct rotation angle during mounting without requiring precise alignment by the operator. The self-aligning mechanism uses the interaction between the star-shaped insertion aid on the output spindle and the corresponding recess in the tool fitting, which guides the tool fitting into the correct position as it is slid onto the spindle.
Solution Approach 2:
A star-shaped insertion aid with protrusions acts as an intermediary element between the output spindle and the tool fitting. This insertion aid engages with corresponding recesses in the tool fitting and guides the alignment process, allowing the tool fitting to be automatically positioned at the correct rotation angle during mounting.
2Ease of operation
If an actuation sleeve is used to place the tool fitting onto the output spindle, then the mounting process is simplified, but the device complexity increases
Solution Approach 1:
The actuation sleeve is completely removed from the design. Instead of using a separate actuation mechanism, the patent integrates the alignment function directly into the tool fitting and output spindle through the star-shaped insertion aid and corresponding recesses, eliminating the need for additional components.
Solution Approach 2:
The alignment and mounting functions are merged into a single integrated mechanism. The star-shaped insertion aid on the output spindle and the corresponding recess in the tool fitting combine to provide both guidance for correct rotation angle and secure detent engagement, eliminating the need for separate actuation and alignment mechanisms.
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
Enables easy and secure mounting of tool fittings without alignment issues, reducing the risk of injury or damage from rotating parts and allowing for quick tool changes, while maintaining a low friction interface for smooth operation.
Implementation Method 1
a compression spring (4) which acts on the ball (15) in a radially outward direction
Implementation Method 2
a compression spring (4) which acts on the ball (15) in a radially outward direction
Data Source
AI summary
A very easy-to-actuate, replaceable tool fitting is comprised in that at least one movably supported profiled body (15) on an output spindle (1) or on the tool fitting (11) of the hand-held power tool and at least one profiled recess (7) on the output spindle (1) or on the tool fitting (11) are shaped and situated in such a way that when the tool fitting (11) is slid onto the output spindle (1), the at least one profiled body (15) engages in detent fashion in the at least one profiled recess (7), achieving both an axial locking and a rotary driving of the tool fitting (11) in relation to the output spindle (1) and means (6, 8, 14) are provided, which, through a rotating and sliding motion of the tool fitting (11) on the output spindle (1), guide the profiled body (15) into the profiled recess (7).