Tool Holder With Flat Sections And Torx Grooves
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Solution Overview
Problem
Existing tool holders for hammer drills are not suitable for accommodating tools with hexagonal or Torx profiles, requiring adapters and complicating the insertion and locking process, which increases costs and reduces user convenience.
Innovation Solution
A tool holder with a receiving sleeve featuring flat peripheral surface sections that can engage with hexagonal shank parts and rotationally symmetrical grooves for Torx profiles, allowing for direct insertion and secure locking of both types without adapters, ensuring good concentricity and simplified operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a receiving sleeve with flat circumferential surface sections is provided for hexagonal shanks, then hexagonal tools can be inserted directly without adapters, but the receiving sleeve structure becomes more complex
Solution Approach 1:
The receiving sleeve is designed with multiple types of drive surfaces (flat circumferential surface sections for hexagonal shanks, grooves for Torx profiles, and SDS-compatible features) within a single component, allowing it to accommodate various tool profiles (hexagonal, Torx, SDS) directly without requiring separate adapters for each tool type
Solution Approach 2:
The inner circumferential surface of the receiving sleeve is segmented into different functional zones: flat circumferential surface sections for hexagonal engagement, rotationally symmetrical grooves for Torx profiles, and SDS-compatible drive grooves. This segmentation allows each zone to optimize its geometry for specific tool types while maintaining a unified receiving sleeve structure
2Adaptability or versatility
If adapters are used to accommodate hexagonal and Torx tools, then tool holder versatility is improved, but costs and operational complexity increase
Solution Approach 1:
The receiving sleeve integrates multiple drive interface types (flat surfaces for hexagonal, grooves for Torx, SDS-compatible features) into a single universal component, eliminating the need for separate adapters and simplifying the tool change process to a single insertion and locking action regardless of tool type
3Adaptability or versatility
If a unified receiving sleeve design is used for multiple tool profiles, then adapter costs are reduced, but the precision of torque transmission may be compromised
Solution Approach 1:
Each drive surface zone within the receiving sleeve is optimized with specific geometric characteristics tailored to its intended tool type: flat circumferential surface sections with precise angular positioning for hexagonal engagement, rotationally symmetrical grooves for Torx profiles, and SDS-compatible drive grooves, ensuring optimal torque transmission for each tool profile at its specific location
Data Source
Figure 1a~3c
Figure 4~5a
Figure 6~7
AI summary
The invention relates to a tool holder for a hand-held drilling device, in particular for a rotary hammer, with a receiving sleeve, in particular formed in one piece, rotatably driven, having a recess for a shank part of an insert tool, wherein the recess is open at both ends and is bounded between them by an inner circumferential surface of the receiving sleeve, wherein the inner circumferential surface (62) of the receiving sleeve (34) has at least six flat circumferential surface sections (84, 86) in the circumferential direction, wherein each adjacent circumferential surface section encloses an angle of 120 degrees, and has six drive grooves (80) for a shank part with a Torx profile, parallel to the axis of rotation (64) of the receiving sleeve (34), arranged at equal angular intervals.It is provided that the rotary drive grooves (80) are arranged between two adjacent, spaced-apart flat circumferential surface sections (84) or that the rotary drive grooves (80) are arranged between two pairs of adjacent flat circumferential surface sections (86).