Multi-Start Thread Torque Transfer Assembly for Impact Drivers
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Solution Overview
Problem
Impact drivers applying high and sudden torque can damage bits, fasteners, or bit holders due to the rigid metallic construction, leading to reduced tool life.
Innovation Solution
A torque transfer assembly with a multi-start thread and energy-absorbing components, such as plastic washers and a hammer head, is introduced between the drive and driven ends of the bit holder to distribute and absorb torque, preventing direct transmission of full impact energy through the metal shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bit holder is made of rigid metallic material to ensure high strength and durability, then the bit holder can withstand high torque application, but the sudden impact energy from impact drivers is directly transmitted through the bit holder to the bit and fastener, causing damage and reducing tool life
Solution Approach 1:
A polymer layer is introduced as an intermediary between the drive body and driven body in the bit holder. This polymer layer acts as a mediator that absorbs and dissipates impact energy through deformation, preventing the direct transmission of sudden impact forces from the drive body to the driven body, bit, and fastener, while still allowing the bit holder to withstand high torque application
Solution Approach 2:
The bit holder is constructed as a composite structure combining metallic components (drive body, driven body) with a polymer layer. This composite design leverages the high strength and torque transmission capabilities of metal while utilizing the polymer's energy absorption and damping properties to mitigate harmful impact forces, creating a multi-material system that addresses both strength and impact protection requirements
2Force
If high and sudden torque is applied by impact drivers to loosen frozen or over-torqued fasteners, then fastener loosening capability is improved, but the same sudden torque application damages the bit, fastener, or bit holder
Solution Approach 1:
The polymer layer serves as a protective intermediary that selectively absorbs the harmful sudden impact forces generated during impact driving operations. This mediator allows the bit holder to deliver the necessary high and sudden torque to loosen frozen or over-torqued fasteners while simultaneously protecting the bit, fastener, and bit holder from damage by dissipating the excessive impact energy through the polymer's deformation
Solution Approach 2:
The polymer layer converts the harmful sudden impact forces into beneficial energy dissipation through controlled deformation. The impact energy that would otherwise damage the bit, fastener, or bit holder is instead absorbed and dissipated by the polymer material, transforming a potentially damaging force into a protective mechanism that extends tool life while maintaining fastener loosening capability
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
This design extends the life of driver bits and bit holders by strategically distributing torque forces, reducing the risk of damage while maintaining the delivery of impact energy.
Implementation Method 1
a multi-start thread assembly operably coupling the jacket to the drive body
Implementation Method 2
The torque transfer assembly may be disposed between the drive body and driven body and may be configured to transfer torque between the drive body and the driven body
Implementation Method 3
A torque transfer assembly with a multi-start thread and energy-absorbing components, such as plastic washers and a hammer head, is introduced between the drive and driven ends of the bit holder to distribute and absorb torque
Implementation Method 4
energy-absorbing components, such as plastic washers and a hammer head, is introduced between the drive and driven ends of the bit holder to distribute and absorb torque
Data Source
AI summary
A torque transfer assembly for an impact bit holder may include a jacket operably coupled to a driven body having a driven end configured to interface with a bit, and a multi-start thread assembly operably coupling the jacket to a drive body having a drive end configured to interface with a powered driver. The torque transfer assembly may be disposed between the drive body and driven body and may be configured to transfer torque between the drive body and the driven body.