Axial Ratchet Wrench Reversing Button Mechanism
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Solution Overview
Problem
Conventional ratchet wrenches require awkward finger movements to pivot the reversing lever for switching between clockwise and counterclockwise driving, making them inconvenient for users.
Innovation Solution
A ratchet wrench design featuring an elongated handle with a reversing button assembly that moves axially to activate a pivotal unit, which pivots the reversing pawl, allowing the drive gear and socket combination to rotate clockwise or counterclockwise, enabling easy switching between driving directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional reversing lever is used that requires leftward or rightward pivoting, then the ratchet wrench can switch between clockwise and counterclockwise driving, but the finger operation becomes awkward and inconvenient
Solution Approach 1:
The patent changes the operating dimension from lateral pivoting (left/right) to axial movement (forward/backward along the handle). The reversing button moves along the axial direction of the handle to activate the pivotal unit, which then pivots the reversing pawl. This dimensional change makes the operation more intuitive and convenient for users.
Solution Approach 2:
The patent introduces a pivotal unit as an intermediary mechanism between the reversing button and the reversing pawl. The pivotal unit receives the axial force from the reversing button and converts it into rotational motion to pivot the reversing pawl. This intermediary simplifies the overall mechanism by separating the button operation from the pawl pivoting action.
2Ease of operation
If the reversing lever requires awkward pivoting motion, then the switching function is achieved, but user convenience is reduced
Solution Approach 1:
The patent changes the operating dimension from lateral pivoting (left/right) to axial movement (forward/backward along the handle). The reversing button moves along the axial direction of the handle to activate the pivotal unit, which then pivots the reversing pawl. This dimensional change makes the operation more intuitive and convenient for users.
3Ease of operation
If a simple reversing button is used, then ease of operation is improved, but the mechanism to pivot the pawl becomes more complex
Solution Approach 1:
The patent introduces a pivotal unit as an intermediary mechanism between the reversing button and the reversing pawl. The pivotal unit receives the axial force from the reversing button and converts it into rotational motion to pivot the reversing pawl. This intermediary simplifies the overall mechanism by separating the button operation from the pawl pivoting action.
Solution Approach 2:
The pivotal unit is designed to be pivotable about the reversing pawl, allowing it to convert linear motion from the button into rotational motion for the pawl. This dynamic mechanism enables simple button operation while achieving the required pawl pivoting function through controlled rotational movement.
Data Source
AI summary
A ratchet wrench includes a handle; a wrench head comprising a first cavity and a second cavity communicating therewith; a drive gear and socket combination rotatably disposed in the first cavity and comprising surface teeth; a reversing pawl comprising pawl teeth on one surface, the pawl teeth meshed with the teeth of the drive gear and socket; a pivotal unit pivotably disposed in the second cavity, the pivotal unit urging against the other surface of the reversing pawl and being adapted to reciprocally pivot about the reversing pawl; and a reversing button assembly moveably disposed on the wrench hand and aligned with an axial direction of the handle. The reversing button assembly is adapted to manually move along a straight line to activate the pivotal unit which pivots the reversing pawl so as to permit the drive gear and socket combination to rotate clockwise or counterclockwise.