Self-Tightening Rotary Tool Holder Using Frustroconical Collet
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Solution Overview
Problem
Existing rotary tool holders require wrenches for clamping accessory tools, which can lead to clamping force issues and increased tool size due to the need for load amplification, and may result in slipping or insufficient clamping force.
Innovation Solution
A self-tightening tool holding system that includes a sleeve with a frustroconical inner surface, a collet with a complementary frustoconical outer surface, a spring mount connected to a motor, and a spring that biases the collet to engage the sleeve, allowing for automatic clamping and release of tools without the need for external wrenches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a wrench-based clamping mechanism is used to secure accessory tools, then the tool holder can provide sufficient clamping force, but the device size increases and the clamping mechanism becomes more complex
Solution Approach 1:
The tool holder employs a self-tightening mechanism where the accessory tool's own rotation during operation automatically tightens the clamping mechanism. The tool's rotational motion drives the clamping elements to engage and secure the tool firmly, eliminating the need for external wrenches or manual load amplification mechanisms.
Solution Approach 2:
The clamping mechanism transitions from a static, manually-operated system to a dynamic, self-actuating system. The clamping force is generated automatically through the rotational motion of the accessory tool, allowing the mechanism to adapt and tighten during operation without requiring additional components or increasing device size.
2Force
If a wrench-based clamping mechanism is used to secure accessory tools, then the tool holder can provide sufficient clamping force, but the tool holder size increases due to the need for load amplification
Solution Approach 1:
The mechanism utilizes the accessory tool's own rotational energy to generate clamping force, eliminating the need for separate load amplification components such as wrenches or leverage mechanisms that would increase the tool holder's volume.
Solution Approach 2:
The system changes the operational parameters by using the tool's rotation speed and torque during normal operation to generate the clamping force, rather than requiring a separate manual torque application step that would necessitate larger mechanical components.
3Reliability
If a traditional clamping mechanism is used, then the tool can be secured, but the clamping force may be insufficient leading to slipping
Solution Approach 1:
The accessory tool itself acts as the actuating mechanism, using its rotation to continuously apply and maintain adequate clamping force. This self-tightening action ensures that the clamping force increases with operation, preventing slipping and ensuring reliable tool security throughout use.
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
The system provides reliable and secure clamping of tools by automatically increasing the clamping force as the tool is used, preventing slipping and simplifying the tool change process, while maintaining a compact design.
Implementation Method 1
a spring. The spring includes a first end portion operably connected to the collet to bias the collet toward a first position whereat the outer surface portion engages the inner surface portion
Implementation Method 2
a spring includes a first end portion operably connected to the collet to bias the collet
Implementation Method 3
a sleeve including a frustroconical inner surface portion, a collet including frustoconical outer surface portion complementary to the inner surface portion
Data Source
AI summary
A tool holding system for a rotary power tool is configured to clamp around a working tool when the working tool is inserted in the tool holding system. The tool holding system includes a sleeve having a frustroconical inner surface portion, a collet having frustoconical outer surface portion complementary to the inner surface portion, a spring mount operably connected to a motor for rotation by the motor, and a spring. The spring includes a first end portion operably connected to the collet to bias the collet toward a first position whereat the outer surface portion engages the inner surface portion, and a second end portion rotationally fixed with respect to the spring mount.