Self-Retaining Drive Shaft Assembly for Torque Wrenches
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Solution Overview
Problem
Conventional drive shaft retainers in torque wrenches often require special tools for installation or removal, leading to component loss, damage, and unsafe operating conditions due to improper engagement.
Innovation Solution
A self-retaining drive shaft assembly of unitary construction, comprising a drive retainer drive shaft, cap, plunger, and segment assembly, which engages securely without loose parts or external tools, ensuring proper seating and reducing the risk of tool failure and enhancing user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional spring clips, snap rings and/or cap assemblies are used to retain drive shafts, then the drive shaft can be retained, but special tools are needed for installation or removal and components may be lost or damaged during operation
Solution Approach 1:
The drive shaft retainer assembly is designed to be self-installing and self-retaining. The spring-loaded clip automatically engages with the drive shaft and tool housing without requiring special installation tools. During operation, the spring maintains constant pressure to keep the drive shaft securely retained, and the design allows for easy manual removal by simply pressing the release mechanism, eliminating the need for special removal tools while maintaining reliable retention throughout the tightening cycle
2Reliability
If chain or lanyard is attached between the spring clip, snap ring and/or cap assembly and the drive shaft, then component loss and damage is reduced, but the chain or lanyard is loose and dangles off the tool creating unsafe conditions
Solution Approach 1:
The invention merges the retention function and the safety function into a single integrated unitary assembly. The spring-loaded clip is designed with built-in retention features that securely hold the drive shaft without requiring separate chains or lanyards. The entire retainer assembly remains compact and attached to the tool housing, eliminating loose dangling components while maintaining secure component retention through the spring-loaded engagement mechanism and integrated retention features
3Reliability
If conventional retainers with multiple separate components are used, then the drive shaft can be retained, but components may come off creating dangerous operating conditions
Solution Approach 1:
The invention combines multiple separate retainer components into a single unitary spring-loaded clip assembly. This integrated design eliminates the interfaces between separate components that could fail or become disassembled. The unitary construction ensures that all retention features move together as one stable assembly, maintaining consistent engagement with the drive shaft throughout the tightening cycle and preventing component separation under vibration and load
Data Source
AI summary
According to a first aspect of the invention we provide a self-retaining drive shaft assembly for use with a device for tightening and loosening of an industrial fastener having: a drive retainer drive shaft; a drive retainer cap; a drive retainer plunger; and a drive retainer segment assembly. The segment assembly is formed between the drive shaft and the cap. The cap is formed between the segment assembly and the plunger. The segment assembly, the cap and the plunger are formed substantially within the drive shaft. Advantageously the retainer assembly is of unitary construction; requires no loose parts or external implements to engage and secure the drive shaft to a drive head of the device; reduces likelihood of device failure during operation due to improper engagement of the drive shaft; and increases user safety during device operation.