Rotary Power Tool Spindle with Interchangeable Shank Design
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Solution Overview
Problem
Rotary power tools, such as core drills, face challenges in efficiently switching between tool bits of different diameters and adapting between wet and dry core bits without a dust-abating system, requiring frequent tool changes and potential seizing issues.
Innovation Solution
A rotary power tool design featuring a spindle with interchangeable shanks of different diameters and a quick release mechanism allowing tool-free attachment and detachment of tool bits, utilizing ramped surfaces and biasing members to secure and release bits without manual tools, enabling easy switching between wet and dry bits and different diameter attachments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single spindle is used for both wet and dry core bits with different hub diameters, then device complexity is reduced, but adaptability deteriorates
Solution Approach 1:
The spindle is segmented into multiple shanks of different diameters (first shank with larger diameter for wet bits, second shank with smaller diameter for dry bits). Each shank can be independently attached or removed from the drive mechanism, allowing the single spindle to accommodate different tool bit types without requiring a completely different spindle configuration.
Solution Approach 2:
The spindle is designed with multi-functionality by incorporating multiple shanks that can serve different purposes. The first shank is configured for wet core bits while the second shank is configured for dry core bits, enabling a single spindle to perform multiple functions and work with various tool bits across different operating conditions.
2Adaptability or versatility
If threaded portions are used for tool bit attachment, then adaptability is improved, but ease of operation deteriorates due to manual tool requirements
Solution Approach 1:
The attachment mechanism is designed to be self-service through the interaction of ramped surfaces and biasing members. When the tool bit is inserted, the ramped surfaces automatically guide it into the correct position, and the biasing members automatically apply clamping force to secure it. The tool bit itself acts as the fastening element by being threaded onto the shank, eliminating the need for external fastening tools.
Solution Approach 2:
Ramped surfaces act as intermediaries between the tool bit hub and the shank, facilitating automatic alignment and positioning during attachment. The biasing members serve as intermediaries that translate the insertion motion into secure clamping force, enabling tool-free attachment without requiring manual intervention or additional fastening components.
3Adaptability or versatility
If wet core bits are used without dust-abating system, then adaptability is improved, but harmful factors increase due to dust generation
Solution Approach 1:
The system is designed to be dynamic by allowing operators to switch between wet and dry operating modes depending on the work environment. The interchangeable shank design enables quick transition between wet bits (for dust control) and dry bits (for environments where water is not suitable), making the system adaptable to varying operational requirements and environmental conditions.
Data Source
AI summary
A rotary power tool comprises a drive mechanism, a spindle rotatable about a rotational axis in response to receiving torque from the drive mechanism, and a first shank coupled for co-rotation with the spindle and having a first diameter. The first shank includes a first threaded portion upon which a first tool bit is receivable. A second shank is coupled for co-rotation with the spindle and extends outwardly from and coaxial with the first shank. The second shank has a second diameter that is smaller than the first diameter and a second threaded portion upon which a second tool bit is receivable.