Tubular Tool Holder Locking Sleeve Spring Mechanism
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Solution Overview
Problem
Existing tool holders for hand-held power tools lack a secure and reliable locking mechanism for insert tools, leading to potential tool misalignment and reduced user safety.
Innovation Solution
A tool holder with a tubular base body and a locking device featuring a spring-loaded locking sleeve, a blocking element, and a fixing element, which allows for secure and reliable locking of insert tools through a combination of axial and rotational displacement, enabling easy switching between locking and unlocking positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking device with locking sleeve and locking element is provided, then tool retention security is improved, but device complexity increases
Solution Approach 1:
The locking element is nested within the locking sleeve, with the locking element positioned inside the hollow cylindrical locking sleeve. This nested arrangement allows both components to occupy the same spatial envelope, reducing overall complexity while maintaining the locking function through the interaction between the locking element's protrusion and the locking sleeve's internal features.
Solution Approach 2:
The locking device is segmented into distinct functional components: the locking sleeve with its internal recess and contact surface, and the locking element with its protrusion. This segmentation allows each component to be optimized independently for its specific function while working together to provide secure tool retention.
2Reliability
If a spring element is used to actuate the locking sleeve, then automatic locking reliability is improved, but device complexity increases
Solution Approach 1:
The spring element is integrated directly into the locking sleeve structure, with the spring positioned within the hollow interior of the locking sleeve. This merging of the spring mechanism with the locking sleeve eliminates the need for separate housing structures, reducing overall device complexity while maintaining automatic locking reliability through the spring's direct action on the locking sleeve.
Solution Approach 2:
The spring element is nested within the hollow cylindrical locking sleeve, utilizing the internal space of the locking sleeve for spring accommodation. This nested arrangement allows the spring mechanism to be compact and integrated, avoiding additional external components and reducing structural complexity.
3Ease of operation
If the locking element is made displaceable along longitudinal extent, then ease of operation is improved, but reliability may worsen
Solution Approach 1:
The locking element is designed with dynamic displacement capability along the longitudinal axis, allowing it to move between locked and unlocked positions. This dynamic feature is complemented by the spring element that provides restoring force, ensuring that the locking element returns to its proper engagement position after displacement, thereby maintaining reliability while enabling ease of operation.
Solution Approach 2:
The spring element provides self-service by automatically returning the locking element to its engaged position after manual displacement. This self-restoring mechanism ensures that the locking engagement is maintained reliably without requiring additional actuation mechanisms or complex control systems, balancing ease of operation with reliability.
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 provides a compact, space-saving design that ensures secure tool retention, allowing for easy tool changes and preventing misalignment, thereby enhancing user safety and tool performance.
Implementation Method 1
The locking sleeve is acted upon in a locking position along a longitudinal extension of the base body, which is at least partially tubular, by means of a spring element
Implementation Method 2
The spring element acts upon the retaining element against the contact element
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
In a tool holder (120) for a hand-held power tool, comprising a base body (122) that is at least partially tubular and forms an internal recess (125) for receiving an insert tool (210), in particular a bit insert tool, and comprising a locking device (180) for releasably locking an insert tool (210), in particular a bit insert tool, that can be arranged in the internal recess (125), wherein the locking device (180) comprises a locking sleeve (127) and a locking element (370), the locking sleeve (127) is acted upon in a locking position along a longitudinal extension (199) of the base body (122) that is at least partially tubular by means of a spring element (320).wherein the locking sleeve (127) has at least a section of its inner circumference (308) a contact element (354) and the at least approximately tubular base body (122) has a fixing element (310) on its outer circumference (302), wherein the spring element (320) acts the fixing element (310) against the contact element (354).