Torque Wrench Handle Guide Surfaces and Knurling
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Solution Overview
Problem
Conventional torque wrenches often have a poor interface design, leading to suboptimal hand positioning and potential inaccuracies in torque application due to inadequate handle design and difficulty in reading markings for torque adjustment.
Innovation Solution
The torque wrench features a handle with sloping guide surfaces on end caps to direct the operator's hand to a consistent grip location, a knurled grip for improved grip, and a torque adjuster with color-contrasted markings on separate cylindrical members for enhanced readability and adjustability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the handle is designed with conventional geometry, then the structure is simple, but the hand positioning is inconsistent and torque application accuracy is reduced
Solution Approach 1:
The handle incorporates a recessed portion with a bottom surface that preliminarily positions the operator's hand before torque application begins. This recessed structure guides the hand into the correct grip position, ensuring consistent lever arm length and improving torque accuracy without requiring complex adjustment mechanisms during operation.
Solution Approach 2:
The handle features a localized recessed portion specifically positioned to receive the operator's hand, while the rest of the handle maintains a simple cylindrical geometry. This localized modification provides precise hand positioning only where needed, maintaining overall structural simplicity while improving measurement accuracy.
2Measurement precision
If the torque adjuster markings are conventional, then the structure is simple, but the markings are difficult to read and torque setting accuracy is reduced
Solution Approach 1:
The torque adjuster incorporates a color ring with alternating high-contrast color segments (e.g., black and silver or black and red) that wrap around the cylindrical adjuster body. This color coding system provides visual differentiation between torque setting increments, making the markings easily readable and enabling accurate torque setting without requiring complex numerical scales or additional labeling mechanisms.
3Ease of operation
If the adjuster interface is conventional, then the structure is simple, but the interface quality is poor and torque adjustment is difficult
Solution Approach 1:
The adjuster features a localized threaded portion with enhanced thread density and a corresponding threaded interface on the handle. This localized high-quality threading provides precise rotational control and secure engagement for torque adjustment, while the rest of the adjuster maintains a simple cylindrical form. The improved local interface quality enables easy and accurate torque adjustment without requiring complex mechanisms throughout the entire adjuster structure.
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 enhances the accuracy and usability of the torque wrench by ensuring consistent hand positioning and easy torque setting adjustments, reducing the likelihood of misplacement and improving the operator's ability to apply precise torque.
Implementation Method 1
a knurled grip for improved grip
Implementation Method 2
a spring extends through the lever arm of the torque wrench to apply pressure to a ball
Data Source
AI summary
A torque wrench may include a head having a driving member configured to be operably coupled to a socket, a handle, a lever arm operably coupled to the head and the handle at respective opposing ends thereof, and a torque adjuster configured to enable a torque setting of the torque wrench to be adjusted. The torque adjuster may include a fixed member affixed to the lever arm and a movable member operably coupled to the fixed member. The handle may include a first end cap at a distal end thereof relative to the head and a second end cap at a proximal end thereof relative to the head, the second end cap being disposed proximate to the movable member.