Hole Saw Mandrel Quick-Change Grip for Standard Arbors
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Solution Overview
Problem
Existing quick-change hole saw mandrels are either limited to proprietary hole saws or require cumbersome adapters and tools for changing hole saws and pilot bits, making the process time-consuming and inconvenient.
Innovation Solution
A quick-change hole saw mandrel designed for conventional hole saws with a central circular mounting aperture and drive pin apertures, featuring a gripping arrangement for tool-less interchange of hole saws and pilot bits, and an adjustable spacer for compatibility with hole saws of different base thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a threaded connection with lock nut is used for detachable mounting, then the hole saw can be interchanged without removing the mandrel from the drill, but the interchange process becomes time-consuming due to loosening and re-tightening requirements
Solution Approach 1:
The mandrel is divided into separate functional components: a gripping arrangement that can independently engage and release the hole saw base, and a pilot bit connection arrangement that separately couples the pilot bit. This segmentation allows each component to be quickly engaged or disengaged without affecting the other, enabling rapid interchange of hole saws without the time-consuming threaded lock nut operation.
Solution Approach 2:
The gripping arrangement is designed to automatically grip the hole saw base when the mounting end is inserted, and can be quickly released by actuating a release mechanism. Similarly, the pilot bit connection arrangement features a quick-release mechanism that automatically secures or releases the pilot bit without requiring manual threading or tightening operations. This self-service design eliminates the need for time-consuming manual fastening and unfastening operations.
2Productivity
If quick-change adapters are attached to each hole saw, then quick-change functionality is achieved, but cost and time for fitting adapters increase, and additional removal steps are required for storage
Solution Approach 1:
The mounting end of the mandrel is designed with a universal gripping arrangement that can accommodate conventional hole saws with circular central mounting apertures and drive pin apertures, eliminating the need for proprietary hole saws or specialized quick-change adapters. The same mounting end also provides quick-release functionality for the pilot bit. This multi-functionality achieves quick-change capability without requiring additional adapter components for each hole saw.
Solution Approach 2:
The quick-change functionality is extracted from the hole saw itself and transferred to the mandrel's mounting end. Instead of modifying each hole saw with adapters, the mandrel is equipped with a gripping arrangement and quick-release mechanisms that provide rapid interchange capability. This extraction eliminates the need for additional adapter components while maintaining the speed benefit of quick-change operation.
3Productivity
If proprietary hole saws with specific configurations are required, then quick-change functionality is achieved, but compatibility with conventional hole saws is lost and users must purchase new proprietary hole saws
Solution Approach 1:
The gripping arrangement in the mounting end is designed to universally accommodate conventional hole saws featuring circular central mounting apertures and drive pin apertures. The gripping arrangement can adapt to different hole saw sizes and base thicknesses through its adjustable design, maintaining compatibility with standard industry hole saw configurations while providing quick-change functionality. This universality eliminates the need for users to purchase proprietary hole saws.
Solution Approach 2:
The gripping arrangement incorporates dynamic elements that allow it to adapt to varying hole saw base thicknesses and dimensions. The gripping mechanism can adjust its engagement characteristics to securely hold different conventional hole saw configurations, providing both quick-change capability and broad compatibility without requiring proprietary hole saw designs.
Data Source
AI summary
Quick-change hole saw mandrel (10) for a hole saw (18); includes drive shank (14) extending along a central axis (C); and mounting end (16) detachable connected to mounting aperture (26) of hole saw (18) and including drive pin (30) for engagement with drive pin aperture (28) of the hole saw (18). The mandrel (10) includes a gripping arrangement (32) insertable through the mounting aperture (26) for gripping the hole saw base (20). In a normally expanded configuration the gripping arrangement (32) grips the base (20). The gripping arrangement is selectively movable to a contracted configuration in which it can be inserted into or removed from the mounting aperture (26). A pilot bit lock selector (44) for selecting between an unlocked mode permitting quick removal and quick insertion of the pilot bit (12) and a locked mode in which the pilot bit (12) is locked against removal.