Compact Ratchet Wrench Offset Driver Leverage
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Solution Overview
Problem
Existing ratchet wrench designs, such as U.S. Pat. No. 1,720,933, face difficulties in allowing users to effectively apply force to tighten screws due to the driver's placement in the middle of the grip.
Innovation Solution
A compact ratchet wrench is designed with a body having a head at one end and a grip at the other, featuring a ratchet head that is rotatably arranged within a cavity. The body's dimensions and the ratchet head's configuration allow for improved leverage and force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the driver is placed in the middle of the grip, then the tool maintains a compact size for easy carrying, but the user cannot effectively apply force to tighten screws
Solution Approach 1:
The patent repositions the driver from a central axial location to an offset radial position within the grip. This dimensional relocation allows the driver to extend toward the grip's outer periphery, creating effective leverage points without increasing the tool's overall length. The driver's offset arrangement enables users to apply force at optimal points while maintaining compact dimensions.
Solution Approach 2:
The driver is designed with selective positioning capability, allowing it to be located at different positions along the grip's outer peripheral edge. This dynamic repositioning feature enables the driver to adapt to different operational requirements, providing effective leverage points while maintaining the tool's compact form factor for portability.
2Device complexity
If the driver extends axially in the middle of the grip, then the structure remains simple, but the user cannot apply force effectively to tighten screws
Solution Approach 1:
The driver transitions from a simple axial extension to an offset radial configuration within the grip. This dimensional change repositions the driver toward the grip's outer periphery, creating effective leverage points without significantly complicating the overall structure. The offset arrangement maintains structural simplicity while dramatically improving force application capability.
3Ease of operation
If the driver is repositioned to the outer periphery of the grip, then force application improves, but the tool size increases reducing portability
Solution Approach 1:
The driver is nested within the grip's internal cavity, utilizing the grip's own structure to accommodate the driver's offset position. The driver fits within the grip's hollow space, extending toward the outer periphery without protruding beyond the grip's outer dimensions. This nesting approach allows effective force application while maintaining compact tool size for portability.
Solution Approach 2:
The driver repositions from a central axial location to an offset radial position within the grip's internal volume. This dimensional relocation allows the driver to access the grip's outer periphery for effective leverage while containing the driver within the grip's overall envelope, preventing any increase in total tool length.
Data Source
AI summary
A compact ratchet wrench comprises a body and a ratchet head. The body has a head and a grip. A length between a distal end of the head and a rotation axis defines a front section length. A length between a distal end of the grip and the rotation axis defines a rear section length. An end of the ratchet head is provided with a driving portion. The driving portion has driving surfaces and a distance between two of the driving surfaces which are opposite to each other defines a drive width. The ratio of the front section length to the drive width is less than 2.5 and greater than or equal to 1. The ratio of the rear section length to drive width is less than 12 and greater than 4.