Multi-size wrench shifting device for compact fastening
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Solution Overview
Problem
Conventional multi-size wrenches face manufacturing complexities and limited usability in small spaces due to the need for varying inner diameters and extended lengths, which complicates production and restricts their application in confined areas.
Innovation Solution
A shifting device for a multi-size wrench featuring a sleeve module with a through hole divided into regions and a movable shifting member, allowing the device to adapt to different fastening sizes by adjusting its position within the wrench body, thereby reducing the overall length and facilitating easier manufacturing and use in small spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the working holes extend in the lengthwise direction to accommodate multiple screw sizes, then the wrench can turn multiple sizes of screws, but the outer sleeve body becomes too long and has many variations in inner diameters, making manufacture complicated
Solution Approach 1:
The outer sleeve body is divided into multiple segments along its length, each segment having a different inner diameter configuration. The inner sleeve is also segmented with different working hole diameters at different positions. This segmentation allows each part to be optimized for specific screw sizes while maintaining overall multi-size capability, reducing manufacturing complexity compared to a single long hole with varying diameters.
Solution Approach 2:
The inner sleeve is nested within the outer sleeve body, with both components having working holes that can align to create different effective opening sizes. This nested structure allows multiple working holes of different diameters to be accommodated within a compact overall length, eliminating the need for a single long hole with multiple diameter variations.
2Adaptability or versatility
If the outer sleeve body and working holes are made long to accommodate multiple screw sizes, then the wrench can turn multiple sizes of screws, but the product cannot work in a small working space
Solution Approach 1:
Instead of extending the length of working holes in one dimension to accommodate multiple screw sizes, the invention uses multiple working holes arranged in different radial positions and depths. The inner sleeve can be positioned at different locations along its length, bringing different combinations of working holes into alignment with the outer sleeve's openings, effectively creating variable size openings without increasing overall length.
3Adaptability or versatility
If the working holes have many variations in inner diameters, then the wrench can accommodate multiple screw sizes, but the product yield becomes low due to manufacturing complications
Solution Approach 1:
Different sections of the outer sleeve body and inner sleeve have locally optimized hole diameters and configurations suited for specific screw size ranges. Rather than creating a single complex hole with continuous diameter variations, the invention uses discrete sections with uniform diameters that can be combined in different ways, simplifying manufacturing processes and improving yield.
Data Source
AI summary
A shifting device includes a sleeve module and a shifting member movably disposed in the sleeve module. The sleeve module has a through hole. The through hole is divided into a first hole region, a buffering region, and a second hole region. The shifting member includes a third operating section and a fourth operating section. The shifting member is movable between a first position and a second position. The fourth operating section of the shifting member is situated in the buffering region when the shifting member assumes the first position, and the second hole region and the third working hole are adapted to turn a fastening member. The third operating section of the shifting member is situated in the buffering region when the shifting member assumes the second position, and the first hole region and the fourth working hole are adapted to turn the fastening member.