Biased Pawl Ratcheting Wrench With Spring Ring Pawl Biasing
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Solution Overview
Problem
Existing ratchet wrenches rely on wire springs that are difficult to manufacture, assemble, and prone to failure due to their size and fragility.
Innovation Solution
A ratchet wrench design featuring a spring ring with resilient biasing leaves and a wheel with pawl recesses, where the spring ring biases the pawls to engage with the inner teeth, allowing for unidirectional rotation and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire springs are used to bias the pawls, then the ratchet mechanism can achieve unidirectional rotation, but the manufacturing difficulty and assembly complexity increase significantly
Solution Approach 1:
The spring ring is segmented into multiple resilient biasing leaves that are integrally formed as part of the ring structure. Each leaf corresponds to a pawl recess and provides independent biasing force, replacing the need for separate wire springs while maintaining the ratcheting function.
Solution Approach 2:
The biasing function previously performed by separate wire springs is merged into the spring ring structure itself. The resilient biasing leaves are integrally formed with the ring, combining the spring function with the ring structure to eliminate separate components and simplify assembly.
2Reliability
If wire springs are used to bias the pawls, then the ratchet mechanism can achieve unidirectional rotation, but the assembly process becomes more complex and time-consuming
Solution Approach 1:
The biasing function previously performed by separate wire springs is merged into the spring ring structure itself. The resilient biasing leaves are integrally formed with the ring, combining the spring function with the ring structure to eliminate separate components and simplify assembly.
Solution Approach 2:
The spring ring with integrally formed resilient leaves provides self-contained biasing functionality. The leaves are automatically positioned into the pawl recesses during assembly, eliminating the need for separate spring installation steps and specialized assembly tools.
3Ease of manufacture
If specialized tools are used to assemble wire springs, then the ratchet mechanism can be assembled, but the manufacturing cost and process complexity increase
Solution Approach 1:
The spring ring with integrally formed resilient leaves provides self-contained biasing functionality. The leaves are automatically positioned into the pawl recesses during assembly, eliminating the need for separate spring installation steps and specialized assembly tools.
Solution Approach 2:
The biasing function previously performed by separate wire springs is merged into the spring ring structure itself. The resilient biasing leaves are integrally formed with the ring, combining the spring function with the ring structure to eliminate separate components and simplify assembly.
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 enhances manufacturing ease, assembly simplicity, and durability by using a spring ring with biasing leaves and a wheel with pawl recesses, providing reliable unidirectional rotation and reducing the risk of spring failure.
Implementation Method 1
a spring ring (14) having a plurality of resilient biasing leaves
Data Source
AI summary
A ratchet wrench comprises a handle defining a cavity including a plurality of teeth on an inner periphery thereof, a wheel, a biasing spring ring, and at least one tooth pawl mounted in recesses formed on the outer periphery of the wheel. The wheel is rotatably mounted inside the cavity and the pawls are biased by the spring ring to engage the plurality of teeth on the inner periphery of the cavity when rotated in a first direction, and to slide over the teeth engage the plurality of teeth on the inner periphery of the cavity when rotated in a direction opposite the first direction.