Tool Holder With Grooved Elongated Hole for Secure Locking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tool holders for percussion machine tools, such as chipping hammers, lack a secure mechanism to hold tools with prismatic or cylindrical shank ends, leading to potential tool disengagement during operation.
Innovation Solution
A tool holder design featuring a receiving sleeve with a prismatic cavity and elongated holes, where the holes have a groove on the inner surface parallel to the working axis, allowing for secure engagement of locking balls that prevent tool dislodgment, and optionally featuring slots and longitudinal grooves for additional stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple receiving sleeve is used to hold tools, then the device complexity is reduced, but the tool retention security deteriorates
Solution Approach 1:
The receiving sleeve is segmented into functional zones: an elongated hole for locking body movement, a groove for lateral positioning, and a cavity for tool reception. This segmentation allows each zone to perform its specific function independently, achieving secure tool retention through coordinated interaction of simple geometric features without adding complex mechanisms.
2Reliability
If locking balls are added to secure tools, then the tool retention security is improved, but the device complexity increases
Solution Approach 1:
The locking balls utilize the geometry of the elongated hole and groove to automatically position and secure themselves during tool insertion. The balls move freely along the elongated hole, are laterally positioned by the groove, and engage with the tool's locking groove without requiring external actuation or complex control mechanisms, achieving self-securing functionality.
Solution Approach 2:
The elongated hole serves multiple functions: it guides the locking balls during insertion, allows their lateral movement for engagement, and provides a pathway for their axial displacement during tool changes. This multi-functionality reduces the need for separate guiding structures, maintaining simplicity while ensuring reliable locking.
3Manufacturing precision
If the groove extends the slot along the working axis, then the locking body positioning precision is improved, but the manufacturing complexity increases
Solution Approach 1:
The groove is formed as a continuous curved feature that extends the slot along the working axis, providing smooth lateral guidance for the locking balls. This curved geometry achieves precise positioning through its continuous surface rather than through multiple discrete features, simplifying manufacturing compared to creating separate positioning elements.
Data Source
Figure 1~2
Figure 3~6
Figure 7~9
AI summary
The tool holder has a receiving sleeve (20) that includes a cylindrical or prismatic cavity (21) for receiving a machine tool along a working axis (4). An elongated hole (30) is formed in the receiving sleeve for receiving a locking element in parallel to the working axis. The grooves (71,72) are provided in an inner surface (35) of the receiving sleeve such that the holes in the inner surface of sleeve are prolonged along the working axis.