Blind Rivet Nut Tool With Dual-Motor Threading and Setting
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Solution Overview
Problem
Existing powered blind rivet nut-setting tools lack efficient mechanisms for transitioning between threading and setting strokes, and for unthreading from the blind rivet nut, leading to incomplete or inaccurate fastening operations.
Innovation Solution
A blind rivet nut-setting tool with a dual-motor system, where one motor rotates the output shaft for threading and another translates the carrier to move the output shaft rearward, utilizing a limit switch and cam mechanism for precise control, and a sensor to manage the setting stroke and unthreading process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single motor is used to perform both rotation and translation functions, then device complexity is reduced, but the precision and reliability of threading and setting operations deteriorate
Solution Approach 1:
The patent divides the motor system into two separate motors: a first motor dedicated to rotating the output shaft for threading operations, and a second motor dedicated to translating the carrier for setting operations. This segmentation allows each motor to be optimized for its specific function, improving overall system reliability and operational precision while maintaining manageable complexity through clear functional separation.
2Ease of operation
If manual operation is used for transitioning between threading and setting strokes, then ease of operation is improved, but productivity and efficiency deteriorate
Solution Approach 1:
The patent incorporates a limit switch that automatically detects when the output shaft has reached the end of its threading stroke and triggers the transition to the setting stroke. This feedback mechanism eliminates the need for manual intervention, allowing the system to automatically sequence operations and thereby improve productivity while maintaining ease of operation through automated control.
Solution Approach 2:
The system performs self-service by automatically transitioning between threading and setting strokes through the limit switch and cam mechanism. The output shaft's own movement triggers the limit switch, which then initiates the setting sequence without requiring external manual control, enabling continuous automated operation and improving overall efficiency.
3Manufacturing precision
If a cam mechanism with pin in lobe is used to translate the carrier, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent uses a cam mechanism as an intermediary device to convert the rotational motion of the second motor into precise linear translation of the carrier. The cam's lobed profile acts as a mediator that transforms rotational input into controlled linear output with high precision, while the simplicity of the cam-follower arrangement (pin in lobe) keeps the overall complexity manageable compared to more complex positioning systems.
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
Enables precise and efficient threading, setting, and unthreading of blind rivet nuts, ensuring reliable fastening and easy operation, improving the accuracy and efficiency of the blind rivet nut-setting process.
Implementation Method 1
The blind rivet nut-setting tool may further comprise a spring arranged in the bore and biasing the output shaft toward the first output shaft position
Implementation Method 2
The blind rivet nut-setting tool may further comprise a magnet on the cam member and a sensor configured to detect the magnet when the carrier is in the second carrier position
Data Source
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AI summary
A blind rivet nut-setting tool includes an output shaft defining a longitudinal axis. The output shaft is moveable along the longitudinal axis between a first position and a second position. The blind rivet nut-setting tool further includes a first motor configured to rotate the output shaft about the longitudinal axis in response to an external force moving the output shaft in a rearward direction from the first position to the second position. The blind rivet nut-setting tool further includes a second motor configured to translate the output shaft along the longitudinal axis in the rearward direction.