Elastic Torque Transfer Assembly for Impact Driver Bit Holder
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Solution Overview
Problem
Bit holders made of rigid metallic materials can damage bits or fasteners when used with impact drivers due to sudden torque application, leading to reduced tool life and increased risk of component failure.
Innovation Solution
An elastic torque transfer assembly is introduced, comprising a drive end and a driven end coupled via a coupling pin and lateral members that distribute torque forces elastically, reducing peak stress and preventing complete torque absorption by the bit holder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bit holder is made of rigid metallic material to ensure strength and durability, then the bit holder can withstand high torque application, but the sudden torque from impact drivers is transmitted directly to the bit and fastener, causing damage and reducing tool life
Solution Approach 1:
The patent introduces a bit holder constructed from compliant material that acts as an intermediary between the impact driver and the bit/fastener. This compliant bit holder absorbs and dampens the sudden torque impulses, preventing direct transmission of harmful forces to the bit and fastener while still allowing effective torque transfer for fastening operations.
Solution Approach 2:
The patent changes the material parameter of the bit holder from rigid metallic material to compliant material. This parameter change allows the bit holder to deform elastically under sudden torque loads, absorbing impact energy and reducing peak forces transmitted to the bit and fastener, thereby preventing damage while maintaining operational effectiveness.
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 sudden force transmission through rigid bit holders can damage components and reduce tool life
Solution Approach 1:
The compliant bit holder serves as a mediator that allows high torque application for loosening frozen fasteners while simultaneously protecting the system from damage. The compliant material absorbs and dissipates the sudden force impulses generated during impact driving, preventing component failure while maintaining the necessary force transmission capability.
Solution Approach 2:
The compliant bit holder provides beforehand cushioning by being pre-configured with material properties that absorb sudden torque impulses. This cushioning effect is always present, ready to protect the bit, fastener, and tool from damage when sudden high torque is applied during impact driving operations.
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 allowing high torque transfer while minimizing the risk of component failure through strategic force distribution, maintaining impact energy delivery without excessive stress on the tool components.
Implementation Method 1
an elastic torque transfer assembly configured to transfer torque between the drive body and the driven body via the coupling pin
Data Source
AI summary
A torque transfer assembly for a bit holder includes a first lateral member, a second lateral member and a coupling pin. The first and second lateral members extend substantially parallel to each other along opposing sides of an axial channel of a base portion of a drive body of the bit holder. The drive body includes a drive end configured to interface with a powered driver. The coupling pin interfaces between the drive body and a driven body of the bit holder to transfer torque between the drive body and the driven body via engagement between the coupling pin and the first and second lateral members.