Ratchet Wrench Direction Control Unit Positioning
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Solution Overview
Problem
Conventional ratchet wrenches suffer from poor connection stability between the end piece and recess, easy detachment of the switch unit, and damage to the thin shell structure due to inadequate contact and positioning, leading to inefficient operation and longevity issues.
Innovation Solution
A ratchet wrench design featuring a main body with specific recesses and abutting faces, a ratchet wheel with a mounting portion, a pawl member with engaging and abutting portions, and a direction control unit including a rotation member, push member, and elastic member, which provides automatic positioning and enhanced contact area for efficient operation and structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the end piece and first recess only have linear contact, then the structure is simple, but the connection stability is poor and positioning effect is lost
Solution Approach 1:
The invention transitions from linear contact (one-dimensional) to surface contact (two-dimensional) by designing the push member with a push face that contacts the switch member over an extended area. This dimensional change enhances connection stability and positioning effect without significantly increasing structural complexity.
2Ease of manufacture
If the first clip is used to mount the switch member, then the assembly is easy, but the clip easily loosens during long-term utilization causing detachment
Solution Approach 1:
The invention extracts the switch member from the third recess by designing it to protrude outward, eliminating the need for clips or other fastening mechanisms. This allows easy assembly while ensuring reliable mounting through the protruding structure that naturally resists detachment.
Solution Approach 2:
The switch member's protruding design allows it to self-retain in the assembled position without external fastening elements. The geometry itself provides the retention function, making the structure self-servicing and eliminating weak points associated with clips.
3Volume of moving object
If the end piece has a thin shell structure, then the overall size is reduced, but it easily hits the wall of the second space causing damage during rotation
Solution Approach 1:
The push member is designed with a cuboid shape that extends in multiple dimensions, creating a larger contact area with the switch member. This multi-dimensional approach allows the thin shell structure to maintain compact size while gaining sufficient structural strength through optimized geometry and contact distribution.
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
The design ensures stable and automatic positioning of the rotation member, prevents detachment of components, and enhances the structural strength and operational efficiency of the ratchet wrench by providing a larger contact area and restricting excessive rotation, thereby improving the tool's longevity and usability.
Implementation Method 1
an elastic member (43), which pushes the push member (42) to abut the pawl member (30)
Data Source
AI summary
A ratchet wrench includes a main body, a ratchet wheel, a pawl member, and a direction control unit. The main body is provided with a first receiving recess, a second receiving recess, a third receiving recess, a first abutting face, and a second abutting face. The pawl member is provided with an engaging portion, a cavity, two first abutting portions, and two corners. The direction control unit includes a rotation member, a push member, and an elastic member. The rotation member is provided with a cylindrical block, and two second abutting portions. The push member is provided with a push face and a receiving space. The push member is restricted by the first abutting face and restricts the rotation member such that the rotation member is mounted in and will not be detached from the third receiving recess.