Bit Holder Torque Transfer Assembly for Impact Load Cushioning
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Solution Overview
Problem
Impact drivers apply high and sudden torque, which can damage bit holders, bits, or fasteners due to the direct transmission of force, leading to reduced tool life and increased risk of failure.
Innovation Solution
A torque transfer assembly in bit holders, comprising an axial movement limiting subassembly and a rotation limiting subassembly, strategically distributes torque through cam bodies and elastic members to indirectly transfer torque, reducing direct force absorption and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bit holder is made of rigid metallic materials to ensure strength and durability, then the bit holder can withstand high torque, but the sudden application of force damages the bit, fastener, or bit holder, reducing tool life
Solution Approach 1:
The patent incorporates an overload protection mechanism that acts as a cushion before damage occurs. This mechanism includes a sacrificial element designed to deform or break at a predetermined load threshold, absorbing the sudden impact energy before it can damage the bit, fastener, or bit holder. This beforehand cushioning allows the bit holder to maintain its rigid metallic structure for strength while protecting against sudden force applications that would otherwise reduce tool life.
Solution Approach 2:
The patent introduces an intermediary overload protection mechanism between the bit holder and the bit/fastener system. This intermediary component absorbs and dissipates excessive force through controlled deformation or failure, preventing direct transmission of damaging sudden forces to the bit and fastener while allowing normal operating forces to pass through. This mediator resolves the contradiction by protecting the reliable components (bit and fastener) while maintaining the strength of the bit holder.
2Force
If high and sudden torque is applied to loosen frozen or over-torqued fasteners, then the fastener can be loosened, but the same sudden torque may damage the bit holder, bit, or fastener
Solution Approach 1:
The patent converts the harmful effect of sudden torque into a beneficial protective mechanism. The overload protection system is designed to fail in a controlled manner when subjected to excessive torque, transforming the potentially damaging sudden force into a controlled deformation or breakage of the sacrificial element. This allows the system to utilize high torque for loosening frozen fasteners while the overload protection absorbs the harmful excess force, preventing damage to valuable components.
Solution Approach 2:
The overload protection mechanism provides beforehand cushioning against the harmful effects of sudden torque application. By designing a sacrificial element with a predetermined failure point, the system prepares a cushion that will absorb excessive torque before it can damage the bit holder, bit, or fastener. This allows users to apply high torque for loosening frozen fasteners with the knowledge that the overload protection will cushion against damage if the torque exceeds safe limits.
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 torque transfer assembly extends the life of driver bits and bit holders by distributing forces without reducing impact energy, thereby improving durability and reducing the likelihood of component failure.
Implementation Method 1
The first and second cam bodies are configured to transfer a majority of the torque between the drive body and the driven body indirectly via the torque transfer assembly by limiting rotation of the first cam body relative to the second cam body
Implementation Method 2
an elastic member configured to absorb a portion of the torque applied to the drive body and to limit relative movement between the drive body and the driven body
Data Source
AI summary
A torque transfer assembly for a bit holder includes an axial movement limiting subassembly and a rotation limiting subassembly. The axial movement limiting subassembly is configured to retain a drive body of the bit holder in proximity to a driven body of the bit holder. The rotation limiting subassembly is configured to cause torque applied to the drive body to be transferred to the driven body. The rotation limiting subassembly includes a first cam body at a distal end of the drive body and a second cam body at a distal end of the driven body. The first and second cam bodies are configured to transfer a majority of the torque between the drive body and the driven body indirectly via the torque transfer assembly by limiting rotation of the first cam body relative to the second cam body.