Socket Wrench Handle Rod Polygonal Cross-Section Anti-Rotation
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Solution Overview
Problem
Conventional socket wrenches experience issues with handle rotation about its lengthwise axis, leading to increased force requirements for tightening nuts and potential handle cracking due to uneven force distribution caused by gaps between handle and lug members.
Innovation Solution
A socket wrench design featuring a handle rod with a polygonal cross-section to prevent rotation about its lengthwise axis, combined with spring-loaded members for linear displacement and engagement with lug members, ensuring even force distribution and preventing handle rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the handle is made linearly slidable to permit use in limited space, then the compactness and adaptability are improved, but the handle becomes rotatable about its lengthwise axis which increases the force required for tightening nuts
Solution Approach 1:
The handle rod is given an asymmetric polygonal cross-section that mates with the polygonal contour of the through bore. This asymmetric geometry prevents rotation of the handle rod about its lengthwise axis, ensuring that applied force is transmitted efficiently to turn the nut without the handle rotating independently, thereby reducing the force required for tightening.
2Reliability
If C-shaped hoops are provided to retain the handle, then the handle retention is improved, but gaps are created between the handle and lug members causing uneven force distribution and potential handle cracking
Solution Approach 1:
The C-shaped hoops are removed from the design. Instead, the handle rod with polygonal cross-section directly engages with the polygonal contour of the through bore in the tubular shaft, and the spring-loaded members engage the handle rod to prevent undesired removal. This eliminates the gaps created by C-shaped hoops, allowing force to be evenly distributed from the handle rod to the lug members through direct contact, preventing stress concentration and handle cracking.
3Productivity
If the handle rod has polygonal cross-section to prevent rotation, then the force transmission efficiency is improved, but the device complexity increases
Solution Approach 1:
The polygonal cross-section of the handle rod serves multiple functions: it prevents rotation of the handle rod about its lengthwise axis, provides engagement surfaces for the spring-loaded members, and ensures proper orientation during assembly. This multi-functional geometric feature achieves improved force transmission efficiency without requiring additional complex components, as the polygonal shape itself performs multiple protective and functional roles.
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 design allows for effective force transmission to the nut without handle rotation, reducing the effort needed for tightening and minimizing stress concentrations that could lead to handle cracking.
Implementation Method 1
The first spring-loaded member is disposed in the tubular shaft and extends outwardly of an outer surface of the tubular shaft such that when the left and right journal ends of the tubular shaft are respectively journaled in the slots of the left and right lug members, the first spring-loaded member is urged by the first biasing force to engage one of the left and right lug members
Data Source
AI summary
A socket wrench includes a head unit with two lug members, a tubular shaft, a handle rod, a first spring-loaded member disposed to permit the tubular shaft to be rotatably engaged with the head unit, and a second spring-loaded member disposed to permit the handle rod to be slidably engaged with the tubular shaft. The handle rod has front and rear end segments each having a cavity configured such that when the handle rod is displaced to a forward or rearward position, the second spring-loaded member is engaged therein, and such that when the handle rod is moved away from the forward or rearward position, the second spring-loaded member can slide out of the cavity.