Thread Insert Tool Holder for Easy Drill Shaft Release
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Solution Overview
Problem
Existing tool holding arrangements for drill units are complicated and difficult to release from the drive shaft after a drill job is finished.
Innovation Solution
A tool holding arrangement with a rotatable shaft featuring a first thread arrangement with a higher pitch than a second thread arrangement, allowing for easy initial loosening and subsequent release of the tool holder, facilitated by an outer sleeve or locking pins for movable engagement, and optionally including a friction-reducing element and sealing device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional thread connection is used between the drive shaft and tool holder, then the connection is secure during drilling operations, but the tool holder becomes difficult to release after the drill job is finished
Solution Approach 1:
The thread connection is segmented into two distinct thread arrangements with different pitch characteristics. The first thread arrangement has a higher pitch for easy initial loosening, while the second thread arrangement has a lower pitch for secure final release. This segmentation allows the same connection mechanism to provide both strong holding during operation and easy release afterward, resolving the contradiction between connection security and ease of release.
2Ease of operation
If a secure thread connection is used to hold the tool holder on the drive shaft, then the tool holder remains firmly attached during drilling, but the connection becomes complicated and difficult to manage for release
Solution Approach 1:
The connection system transitions from a static single-pitch thread to a dynamic two-pitch thread system that changes its mechanical characteristics during the release process. The higher pitch first engages to provide mechanical advantage for initial loosening, then the lower pitch engages for final release. This dynamic behavior simplifies the release operation while maintaining connection security during drilling, reducing the overall complexity of managing the connection.
Data Source
AI summary
The present disclosure relates to a tool holding arrangement (1, 1′, 1″) comprising a rotatable shaft (2, 2′, 2″) which is at least connectable to a tool driving power source (3) and comprises a first shaft thread (4, 4′). The tool holding arrangement (1, 1′, 1) comprises a thread insert (5, 5′) that comprises a first insert thread (6, 6′), adapted to engage the first shaft thread (4, 4′) so as to form a first thread arrangement (4, 6; 4′, 6′). The thread insert (5, 5′) comprises a second insert thread (7) that is adapted to engage a tool thread (8) of a tool holding device (9) that is arranged to be 2 screwed onto the second insert thread (7) so as to form a second thread arrangement (7, 8), the first thread arrangement (4, 6; 4′, 6′) having a higher pitch than the second thread arrangement (7, 8).