Flywheel Carriage Fastening Tool for Stable Driver Engagement
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Solution Overview
Problem
Flywheel driven fastening tools face inefficiencies due to changes in energy transfer as the driver wears, detrimental oscillation from pinch roller flexing, and high dynamic loading forces on return springs, which affect longevity and tool length.
Innovation Solution
A flywheel driven fastening tool with a flywheel carriage and integrated brushless motor, guided by aligned guide slots at an acute angle, and a driver return assembly using a pivoting linkage with a torsion spring, along with fixed pinch rollers to enhance energy transfer and minimize driver flexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a drive motor assembly with rotating flywheel is used to drive the fastener driver, then energy can be transferred to propel the driver from returned position to extended position, but changes in attack angle and energy transfer efficiency occur as the driver wears over the life of the tool
Solution Approach 1:
The patent employs a movable flywheel carriage that can shift position along guide slots to dynamically adjust the attack angle between the flywheel and driver. This dynamic adjustment compensates for driver wear over time, maintaining optimal energy transfer efficiency throughout the driver's service life rather than degrading as conventional fixed-angle designs would
Solution Approach 2:
The system changes the attack angle parameter dynamically by moving the flywheel carriage to different positions. This parameter adjustment compensates for driver wear, ensuring consistent energy transfer efficiency from the flywheel to the driver throughout the operational life of the fastening tool
2Power
If a pinch roller is positioned on the opposite side of the driver from the flywheel to transfer energy, then energy transfer can occur, but flexing of the drive blade results in detrimental oscillation of the fastener engaging end
Solution Approach 1:
The patent removes the pinch roller component from the energy transfer mechanism. Instead of using a pinch roller that causes blade flexing and oscillation, the design transfers energy directly through the movable flywheel carriage engaging the driver profile, eliminating the harmful flexing and oscillation while maintaining effective energy transfer
Solution Approach 2:
The movable flywheel carriage serves as an intermediary mechanism between the flywheel and driver. It provides controlled engagement and energy transfer without the flexing issues caused by pinch rollers, using guide slots and adjustable positioning to maintain stable force transmission
3Ease of operation
If compression return springs are mounted on guide rails to return the driver during the return stroke, then the driver can be returned from extended position to home position, but extremely high dynamic loading forces generate surge velocity waves detrimental to spring fatigue life
Solution Approach 1:
The patent uses a torsion spring in a pivoting linkage configuration that provides gradual, controlled return force rather than sudden compression. This cushioning approach reduces peak loading forces and surge velocity waves, significantly extending the fatigue life of the return spring while maintaining effective driver return function
Solution Approach 2:
The return mechanism uses a pivoting linkage with torsion spring that dynamically adjusts the return force based on driver position. This dynamic system provides smooth acceleration and deceleration during the return stroke, avoiding the high-impact loading that would occur with simple compression springs
4Ease of operation
If compression return springs are used in the driver return assembly, then the driver can be returned during the return stroke, but the room required along the drive rails limits the ability to shorten the length of the tool in the direction of the driver axis
Solution Approach 1:
The patent transitions from a linear compression spring arrangement (one-dimensional space requirement) to a pivoting linkage with torsion spring (utilizing rotational motion in a different dimension). This dimensional change allows the return mechanism to function effectively while occupying less linear space along the driver axis, enabling a more compact tool design
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
Improves energy transfer efficiency, reduces driver oscillation, and extends the life of return springs, allowing for a more compact tool design.
Implementation Method 1
a brushless direct current motor operable to rotate the flywheel
Implementation Method 2
a return assembly including a pivoting linkage and a torsion spring
Data Source
AI summary
A flywheel (34) can be mounted on a flywheel carriage (88) that can include a pair of axles (90). The flywheel carriage can be movable along two pairs of guide slots (42) of the tool frame between a disengaged position in which the flywheel is spaced from the fastener driver (26), and an engaged position in which the flywheel is engaged with the fastener driver to drive the fastener driver along a driver axis. A pair of pinch rollers (50) can be coupled to the tool frame and can be engageable with a pinch roller side of the driver profile that is opposite the flywheel side. A plane aligned with an axis of rotation of the flywheel and oriented perpendicular to the driver axis can be located between an axis of rotation of each of the pair of pinch rollers throughout engagement of the flywheel with the fastener driver along the longitudinal flywheel engagement length.