Handheld Machine Tool Locking Sleeve Segmentation
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Solution Overview
Problem
Existing handheld machine tools with multi-faced inner and outer receptacles for tool inserts have cumbersome locking mechanisms due to short and thin locking sleeves, making them difficult to handle and operate, especially during unlocking.
Innovation Solution
A two-part locking sleeve design with a threaded connection between an operating element and a holding element, featuring a spiral or concentric wave internal screw thread, and mounting aid elements, along with a damping element, to enhance the length and diameter of the locking sleeve, facilitating easier operation and secure tool removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking sleeve is used for securing tool inserts in handheld machine tools, then the tool insert can be locked securely, but the locking sleeve becomes difficult to handle and operate due to its short length and small diameter
Solution Approach 1:
The locking sleeve is divided into two separate parts: an operating element with a grip portion for user interaction, and a holding element that actually engages with the tool insert. This segmentation allows the operating element to have sufficient length and diameter for easy handling, while the holding element maintains the locking function, thus resolving the contradiction between reliable locking and ease of operation.
2Ease of operation
If the locking sleeve is made longer and thicker to improve handling, then ease of operation improves, but the device complexity increases
Solution Approach 1:
By segmenting the locking sleeve into operating element and holding element connected via threaded connection, the design achieves improved handling characteristics without excessive complexity. The threaded connection provides a simple yet effective means of joining the two parts, avoiding the need for complex fastening mechanisms.
Solution Approach 2:
The operating element and holding element are designed to connect through a threaded interface where one part nests into the other, creating a compact assembled structure that maintains simplicity while allowing the operating element to have extended dimensions for better handling.
3Ease of manufacture
If a threaded connection is used to connect the operating element and holding element, then assembly is simplified, but vibrations during operation may cause component separation
Solution Approach 1:
A damping element is incorporated into the threaded connection between the operating element and holding element to cushion against vibrations during operation. This damping element prevents vibration-induced loosening or separation of the threaded connection, thereby maintaining connection stability while preserving the simplicity of assembly.
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 locking sleeve design improves handling convenience and safety by allowing a stable, robust, and secure unlocking process, preventing component separation due to vibrations, and enabling easy assembly and disassembly.
Implementation Method 1
against a spring force applied by an associated spring element
Implementation Method 2
The operating element and a holding element, which are connected to each other via a threaded connection
Data Source
AI summary
A handheld machine tool having an output shaft on which a tool holding fixture is developed, which has a multi-faced inner receptacle and a multi-faced outer receptacle, the multi-faced inner receptacle to connect to a tool insert, which can be locked using a locking device assigned to the tool holding fixture; the locking device having a locking sleeve which is displaceable for unlocking the tool insert against a spring force applied by an associated spring element in an axial direction facing away from the handheld machine tool, from a locking to an unlocking position, the locking sleeve has an operating element and a holding element connected to each other via a threaded connection, the holding element driven by the associated spring element in the direction of the locking position of the locking sleeve and the operating element enables displacement of the locking sleeve from the locking to the unlocking position.