Multi-Start Thread Torque Wrench Adjustment
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Solution Overview
Problem
Conventional folding torque wrenches require numerous rotations to adjust the torque value due to single-start threads, making the process time-consuming for adjusting torque values within a large range, such as from 600 to 700 pound-feet.
Innovation Solution
The folding torque wrench incorporates a multi-start threaded mechanism, where the threaded section of the connection rod and the threaded hole of the adjustment member are designed as triple-start threads, allowing the adjustment member to move three times the pitch with each rotation, significantly reducing the number of rotations needed to adjust the torque value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If single-start threads are used for the adjustment member and rod member, then the structure is simple and easy to manufacture, but the torque value adjustment requires many rotations which is time-consuming
Solution Approach 1:
The patent changes the thread configuration parameter from single-start to multi-start (specifically double-start or more). This parameter change allows the adjustment member to travel a greater axial distance per rotation, directly increasing torque adjustment speed while maintaining the threaded mechanism's structural simplicity
Solution Approach 2:
The patent makes the threaded mechanism dynamically adjustable by allowing the adjustment member to be rotated freely to change torque values. The multi-start thread design enables rapid dynamic adjustment of torque settings without requiring complex mechanisms, improving the responsiveness and adaptability of the torque wrench
2Ease of operation
If the adjustment member is rotated many circles to adjust torque value within a large range, then the torque can be accurately set, but the adjustment process becomes time-consuming
Solution Approach 1:
By changing the thread start parameter to multi-start, the axial travel per rotation is increased. This allows the operator to quickly set torque values across a large range (e.g., 600-700 pound-feet) with fewer rotations, reducing adjustment time while maintaining ease of operation through the same rotational interface
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 enables quick adjustment of the torque value by allowing the adjustment member to travel a larger distance with fewer rotations, thereby saving time and improving efficiency in setting torque values within a large range.
Implementation Method 1
the threaded section of the connection rod and the threaded hole of the adjustment member are designed as triple-start threads, allowing the adjustment member to move three times the pitch with each rotation
Implementation Method 2
When adjusting the set torque value of the torque wrench, the elastic energy of the elastic member is changed
Data Source
AI summary
A folding torque wrench includes a bar body, a connection rod the front end of which is pivotally connected with the bar body, a tubular body fitted on the connection rod and a torque adjustment mechanism having at least one elastic member and an adjustment member. A threaded section of rear end of the connection rod is screwed in a threaded hole of the adjustment member. The threaded section of the connection rod and the threaded hole of the adjustment member are formed as a first threaded section and a second threaded section. The first threaded section is at least double-start threads. When rotating the adjustment member by one circle, the adjustment member is moved in the longitudinal direction of the connection rod by a travel, which is over two time the pitch of the first threaded section. The torque value of the wrench can be quickly greatly adjusted only by means of rotating the adjustment member by few circles.