Ratchet Wrench Assembly Using Segmented Positioning
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Solution Overview
Problem
Conventional reversible ratchet wrenches face difficulties in assembly due to the positioning ball dropping out during installation, requiring skilled personnel and being prone to loss.
Innovation Solution
A ratchet wrench design featuring a handle with a mounting hole, pivot hole, and receiving hole, along with a direction controller having a guide groove and positioning notches, and a positioning member with a spring and ball, allowing the ball to be securely engaged with a notch without dropping during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the positioning ball is installed simultaneously with the direction controller, then the positioning function is achieved, but the positioning ball tends to drop out due to spring elastic force making the installation difficult
Solution Approach 1:
The patent divides the assembly process into two separate steps: first installing the positioning ball into the positioning hole, then installing the direction controller. This segmentation allows the positioning ball to be securely placed before the spring exerts full elastic force during controller installation, preventing the ball from dropping out and making assembly easier.
Solution Approach 2:
The patent performs the preliminary action of installing the positioning ball into the positioning hole before installing the direction controller. This preliminary placement ensures the ball is already in position and can be engaged by the spring without being displaced during the subsequent controller installation process.
2Reliability
If the positioning ball is installed simultaneously with the direction controller, then the positioning function is achieved, but skilled personnel are required and the ball is prone to loss
Solution Approach 1:
By segmenting the assembly into two distinct steps (positioning ball installation followed by direction controller installation), the patent eliminates the need for skilled personnel to perform complex simultaneous installation. The simplified sequential process can be easily understood and executed by ordinary workers, reducing training requirements and minimizing the risk of losing the positioning ball.
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
Facilitates easy and convenient assembly of the ratchet wrench by preventing the positioning ball from falling, eliminating the need for skilled assistance and ensuring complete installation.
Implementation Method 1
a positioning member, which includes a coil spring and a positioning ball supported by the coil spring
Data Source
AI summary
A ratchet wrench includes a handle having a receiving hole, a ratchet wheel rotatably mounted in the handle, a direction controller pivotally mounted in the handle and provided at a periphery thereof with a guide groove, a pawl connected with the direction controller and engaged with the ratchet wheel, and a positioning member. When the direction controller is in a first position, a positioning ball of the positioning member is slidable to the receiving hole of the handle through the guide groove. When the direction controller is turned to a second position, the positioning ball is supported by a spring and engaged with a positioning notch of the direction controller so as to hole the direction controller in position.