Pipe Threader Die Holder Lock Ring for Secure Die Engagement
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Solution Overview
Problem
Existing pipe threaders lack efficient mechanisms for securely engaging and disengaging dies, leading to potential misalignment and reduced operational reliability.
Innovation Solution
The pipe threader incorporates a die holder with a gear member and a lock ring system, featuring key recesses, detent recesses, and biasing members, which allows for secure engagement and disengagement of dies through a rotational mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple die holder without locking mechanism is used, then the device complexity is reduced, but the reliability of die engagement deteriorates
Solution Approach 1:
The biasing member preliminarily positions the key in a retracted state within the key recess, preparing it for automatic engagement with the die's keyway once the die is inserted, ensuring reliable connection without complex manual intervention
Solution Approach 2:
The key acts as an intermediary element between the die holder and the die, transferring torque and ensuring precise alignment through the key-keyway interface, while the lock ring provides additional intermediary locking action
2Reliability
If a lock ring system with multiple components is implemented, then the reliability of die engagement is improved, but the device complexity increases
Solution Approach 1:
The lock ring is designed to rotate between locked and unlocked positions, providing dynamic control over die engagement. The detent members dynamically engage with detent recesses to maintain locked position, while allowing controlled movement for die insertion and removal
Solution Approach 2:
The lock ring combines multiple functions into a single component: it provides locking through contact surfaces, positioning through detent members, and control through rotational movement, reducing the need for separate locking mechanisms
3Device complexity
If the key is always biased toward the rotational axis, then the die holder structure is simplified, but the ease of operation for die insertion deteriorates
Solution Approach 1:
The key transitions from a statically biased position to a dynamically adjustable position during die insertion. The biasing member maintains the key in a retracted position during normal operation, but allows the key to move radially outward when die insertion forces are applied, facilitating easy die installation
4Reliability
If a rotational lock ring mechanism is used, then the reliability of preventing accidental disengagement is improved, but the ease of operation for die removal deteriorates
Solution Approach 1:
Before die removal, the user must preliminarily rotate the lock ring to the unlocked position, which preliminarily disengages the contact surfaces and detent members. This preliminary action ensures that the die can be removed without resistance while maintaining security during operation
Solution Approach 2:
The lock ring provides dynamic control where the locked position prevents accidental disengagement through mechanical interference, while the unlocked position allows controlled removal. The rotational movement creates a clear operational sequence that prevents inadvertent die removal
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
This solution enables precise and reliable rotation of the die, ensuring accurate thread cutting on pipes while preventing accidental disengagement during operation.
Implementation Method 1
a biasing member in the key recess and biasing the key toward the rotational axis
Implementation Method 2
a gear member including an outer circumference with a second plurality of teeth engaged with the first plurality teeth of the output gear, such that the die holder is rotatable in response to receiving torque from the output gear
Data Source
AI summary
A pipe threader comprises a housing and a drive assembly including a motor and an output gear having a first plurality of teeth. A die holder defines a rotational axis and includes a gear member including an outer circumference with a second plurality of teeth engaged with the output gear. The gear member includes an inner circumference with a key recess. A lock ring is rotatable relative to the gear member and including a contact surface. A key is arranged in the key recess and a biasing member in the key recess and biasing the key toward the rotational axis. The lock ring is movable between a locked position, in which the contact surface inhibits the key from moving away from the rotational axis, and an unlocked position, in which the key is movable away from the rotational axis in response to insertion of a die into the die holder.