Ratchet Tool Shaft With Pawls And Control Ferrule For High Torque
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Solution Overview
Problem
Conventional ratchet tool devices have a relatively weak structure that cannot withstand high torque, necessitating an improvement in strength to effectively drive fasteners or work pieces.
Innovation Solution
A ratchet tool device featuring a shaft with compartments and cavities, pawls with toothed segments and swellings, a barrel with an internal gear, and a control ferrule with actuators and depressions, along with a spring biasing member to enhance torque handling and directional control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional ratchet mechanism is used, then the device structure is simple, but the strength and torque handling capability are insufficient
Solution Approach 1:
The ratchet mechanism is divided into multiple pawls (first pawl and second pawl) that can independently engage with the gear, allowing the torque handling capability to be increased by distributing the load across multiple engagement points rather than relying on a single pawl structure
Solution Approach 2:
Multiple pawls are combined to work together with a single gear, creating a unified force transmission system where the collective strength of all pawls contributes to the overall torque handling capability while maintaining a coordinated operation through the common gear engagement
2Reliability
If multiple pawls are added to increase strength, then the torque handling capability improves, but the device complexity increases
Solution Approach 1:
The control ferrule incorporates actuators that can dynamically control the engagement state of each pawl, allowing the system to adaptively engage or disengage individual pawls based on operational requirements, thereby maintaining reliability while providing controlled complexity
Solution Approach 2:
The control ferrule acts as an intermediary mechanism between the user input and the multiple pawls, providing a centralized control interface that manages the complexity of controlling multiple pawl engagement states through a single coordinated mechanism
3Power
If the ratchet mechanism is strengthened to handle high torque, then the driving capability improves, but the ease of operation may be affected
Solution Approach 1:
The gear teeth and pawl engagement surfaces utilize curved geometries that facilitate smooth rolling contact and gradual engagement, reducing operational friction and improving ease of operation while maintaining high torque handling capability through the curved surface area contact
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 enhanced design allows for stable and efficient rotation of fasteners or work pieces under high torque, improving the strength and functionality of the ratchet mechanism.
Implementation Method 1
a spring biasing member is engaged between the first and the second pawls for biasing and forcing the toothed segments of the first and the second pawls to engage with the internal gear of the barrel
Implementation Method 2
a spring biased projection is disposed or engaged in the shaft for selectively engaging with either the first or the second depression of the control ferrule and for anchoring and positioning the control ferrule to the shaft at selected positions
Implementation Method 3
the first and the second pawls each including a curved surface for engaging with the curved surface of the shaft respectively and for guiding the first and the second pawls to smoothly rotate relative to the shaft
Data Source
AI summary
A ratchet tool device includes a shaft having two compartments formed by curved surfaces, two pawls pivotally attached to the shafts and each having a toothed segment and a swelling, a barrel having an opening for engaging with the shaft and having an internal gear for engaging with the toothed segments of the pawls and for determining the rotational direction of the barrel by the shaft, a spring biasing member is engaged between the pawls for biasing the toothed segments of the pawls to engage with the internal gear of the barrel, a control ferrule is engaged with the shaft and the barrel and includes two actuators for engaging with the swellings and for disengaging the toothed segments of the pawls from the internal gear of the barrel.