Unidirectional Ratchet Wrench Control Plate Design
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Solution Overview
Problem
Conventional ratchet wrenches face manufacturing complexities, wear issues, and increased costs due to complicated processes, wear of ratchet teeth, and higher production costs for positioning elements and elastic components.
Innovation Solution
A unidirectional ratchet wrench design featuring a body with distinct containing grooves, a ratchet with a sheathing portion, an arc-shaped brake tooth, a control plate made by sheet metal manufacturing, and an elastic element integrated within the brake tooth, allowing for simplified assembly and reduced manufacturing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a metal sheet is stamped into arc iron plates and welded with bent rods and press plates, then the ratchet wrench components can be assembled, but the manufacturing procedure becomes complicated
Solution Approach 1:
The patent integrates multiple separate components (metal sheet, bent rod, press plate) into a single integrated structure where the control plate is directly formed with the pressing edge and positioning features, eliminating the need for separate welding operations and reducing assembly complexity
Solution Approach 2:
The control plate serves multiple functions simultaneously: it acts as the pressing edge for actuating the ratchet, provides positioning features for the brake tooth, and integrates the elastic element mounting structure, thereby reducing the number of separate components needed
2Reliability
If the metal sheet is coupled to ratchet teeth, then the ratchet wrench can function, but the ratchet teeth wear out after rotation causing loss of unidirectional rotation
Solution Approach 1:
The patent extracts the wear-prone interaction between the metal sheet and ratchet teeth by introducing a brake tooth that engages with the ratchet at a different location, separating the actuation function from the engagement function to prevent direct rubbing wear
Solution Approach 2:
The brake tooth acts as an intermediary component between the control plate and the ratchet, transferring the actuation force without allowing direct contact between the control plate and ratchet teeth, thereby preventing wear
3Object-affected harmful factors
If adhesive is used to fix the metal sheet into arc embedded groove, then the metal sheet will not rub with ratchet teeth, but an additional manufacturing process is required
Solution Approach 1:
The patent eliminates the need for adhesive by extracting the metal sheet from the arc embedded groove configuration and redesigning the control plate with integrated positioning features that provide mechanical retention without additional fastening methods
4Adaptability or versatility
If the unidirectional ratchet block is formed by casting powder with a hole for elastic element, then the structure can be created, but the hole must be drilled increasing manufacturing cost
Solution Approach 1:
The patent applies preliminary action by forming the through-hole feature directly into the control plate during the sheet metal manufacturing process, so that the elastic element can be installed without requiring subsequent drilling operations
5Device complexity
If the positioning element is in the same shape as the containing grooves, then the structure is simple, but the positioning element requires higher cost
Solution Approach 1:
The patent applies local quality by creating localized positioning protrusions on the control plate that are simpler in form than the containing grooves themselves, concentrating the positioning function in specific local features rather than requiring a complex overall shape
6Ease of manufacture
If the spring is installed in positioning portion and abutted against lateral side and top surface of latch block, then the spring can be mounted, but the spring is rubbed with latch block causing damage easily
Solution Approach 1:
The patent extracts the spring from direct contact with the latch block by repositioning it in the control plate's through-hole, separating the elastic element's function from the latching mechanism to eliminate friction and improve durability
7Device complexity
If the positioning element and ratchet are contained in the wrench body, then the assembly is complete, but the wrench body must be thicker than general wrench
Solution Approach 1:
The patent applies nesting by placing the control plate within the existing containing groove structure of the wrench body, and positioning the brake tooth within the control plate's features, creating a nested arrangement that maximizes space utilization without increasing overall wrench body thickness
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 simplifies manufacturing, reduces costs, prevents wear on ratchet teeth, and ensures effective unidirectional rotation with enhanced durability and ease of component replacement.
Implementation Method 1
an elastic element (50) is installed in the accommodating groove (32) of the brake tooth (30)
Data Source
AI summary
A unidirectional ratchet wrench includes a body. The body has a first containing groove disposed at an action end of the body. A ratchet includes a sheathing portion formed thereof. A brake tooth is in an arc shape, and the brake tooth includes a plurality of latch teeth formed thereon for engaging with the engaging teeth of the ratchet. A control plate is contained in the arc-shaped second containing groove, and the control plate has the same height as the pressing edge of the body. An elastic element is contained in the accommodating groove of the brake tooth. A cover is installed in an upper cover groove of the body. A latch ring is latched to an circular latch groove of the body for fixing the cover onto the body.