Hole Saw Holder Conical Coupling Backlash Reduction
Solution Overview
Problem
Existing methods for coupling hole saws to power tools often result in backlash and poor cutting quality due to play between the hole saw and the holder, leading to reduced service life and increased user stress.
Innovation Solution
A holder with a receiving shank and a connecting piece featuring conical contact surfaces and a plug-in coupling mechanism, allowing for tool-free, backlash-free attachment of hole saws with different diameters and geometries, using a locking sleeve and latching element for secure engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driver pins are used on the receptacle to secure the hole saw, then the hole saw can be attached to the power tool, but play between the hole saw and holder results in backlash and poor cutting quality
Solution Approach 1:
The invention employs conical contact surfaces instead of cylindrical driver pins. The conical geometry provides self-centering action that eliminates play and backlash between the hole saw and holder, ensuring both secure attachment and precise cutting quality without the need for additional locking mechanisms.
2Reliability
If clamping screws are used to secure the hole saw on the shank, then the hole saw can be firmly attached, but changing the hole saw requires screwing and unscrewing which reduces productivity
Solution Approach 1:
The conical contact surfaces enable a quick-change mechanism where the hole saw can be rapidly attached and detached by simple insertion and withdrawal motions along the cone axis, eliminating the time-consuming screwing and unscrewing operations while maintaining firm attachment during use.
3Reliability
If an external thread is provided on the receptacle for screwing the hole saw, then the hole saw can be secured to the holder, but play remains between components causing vibrations and reduced service life
Solution Approach 1:
The conical contact surfaces create a self-centering, play-free connection that eliminates vibrations during operation. The tapered geometry ensures continuous contact and uniform load distribution, preventing the loose-fit problems associated with threaded connections and thereby extending the service life of both the hole saw and holder.
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
Ensures concentric operation, reduces vibrations, extends the service life of hole saws, and improves borehole quality while minimizing user burden and wear on the machine drive.
Implementation Method 1
the connecting piece and the receiving shank have conical contact surfaces which are complementary to one another. The conical contact surfaces ensure concentricity and minimal play between the shank and the connecting piece.
Data Source
AI summary
A receptacle for coupling a hole saw (2) with a machine drive, comprising a receiving shaft (30) for connection to the machine drive and a connecting nozzle (31) that can be connected to the receiving shaft (30) without tools and is fixedly associated with the hole saw (2), wherein the receiving shaft (30) and the connecting nozzle (31) have complementary conical contact surfaces (302, 312). A tool arrangement for use with a machine drive, comprising a hole saw (2) with a cutting end (20) having cutting teeth (200) and an opposing coupling end (21), and a receptacle (3).