Passive Locking Chuck for Fast Screw Anchor Installation
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Solution Overview
Problem
Conventional rotary driver chucks require additional manual steps and risk component pull-out or weakening during withdrawal, especially in utility-scale solar array installations where thousands of screw anchors need to be driven, due to the need for locking and unlocking mechanisms to secure the anchor before and after driving.
Innovation Solution
A passive locking chuck design for rotary drivers that securely holds the screw anchor without manual locking, utilizing a movable inner ring with recesses and ball detents to align and lock the anchor during driving, allowing secure engagement and automatic unlocking when resistance is encountered, enabling straightforward withdrawal without disturbing the anchor's embedment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional locking mechanisms (set screws, pins) are used to secure the anchor in the chuck, then the anchor is held securely during driving, but additional manual steps are required for locking and unlocking, reducing productivity
Solution Approach 1:
The chuck automatically locks the anchor in place through the interaction between the movable ring's recesses and the coupler's driving features, and automatically unlocks when resistance is encountered during driving. This self-actuating mechanism eliminates the need for manual locking and unlocking operations, allowing the system to perform the locking function automatically based on the driving process state.
Solution Approach 2:
The chuck transitions from a static locking mechanism to a dynamic one where the movable ring can shift position. The ring moves between locked and unlocked states automatically in response to driving resistance, enabling the system to adapt its locking state dynamically during the driving process without manual intervention.
2Reliability
If locking mechanisms are used to secure the anchor, then the anchor does not fall out during machine adjustment, but the locking fastener must be removed after driving, adding process steps
Solution Approach 1:
The system uses the driving resistance itself as the trigger for unlocking. When the anchor encounters resistance during driving, this force automatically actuates the movable ring to shift position, releasing the lock. The system serves itself by using the operational conditions (driving resistance) to automatically transition from locked to unlocked state.
Solution Approach 2:
The chuck is designed with pre-aligned recesses in the fixed and movable rings that automatically engage with the coupler's driving features when the anchor is inserted. The locking action occurs automatically as part of the insertion process, before driving begins, eliminating the need for separate locking steps.
3Reliability
If the chuck remains engaged with the anchor after driving, then the anchor is securely held, but withdrawal of the rotary driver may pull out or weaken the embedded component
Solution Approach 1:
The system uses feedback from the driving process - specifically the resistance encountered during anchor penetration - to control the locking state. When resistance is detected, this feedback signal automatically triggers the movable ring to shift and unlock the anchor, ensuring the chuck releases the anchor at the appropriate moment to prevent pull-out during withdrawal.
Solution Approach 2:
The unlocking mechanism is activated automatically by the driving resistance itself, without external control. The system monitors its own operational state through the resistance force and self-regulates the locking status, ensuring timely release to prevent harmful effects during withdrawal.
4Reliability
If manual locking steps are required for each anchor, then the anchor is securely held, but the process becomes time-consuming for utility-scale installations with thousands of anchors
Solution Approach 1:
The chuck automatically performs both locking and unlocking operations based on the driving process conditions. The movable ring shifts position automatically when resistance is encountered, eliminating the need for operators to manually lock or unlock each anchor. This self-actuating mechanism dramatically reduces the time required per anchor installation.
Solution Approach 2:
The chuck maintains continuous engagement with the anchor throughout the driving process, providing uninterrupted holding force. The automatic locking mechanism ensures the anchor remains securely held from insertion through driving, eliminating gaps in the useful action that would require manual intervention to maintain security.
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 secure and efficient driving of screw anchors across large solar array sites by eliminating the need for additional manual steps, preventing anchor fall-out and ensuring the anchor remains embedded during driver retraction, thus reducing the risk of component pull-out and simplifying the installation process.
Implementation Method 1
A series of ball detents extend through the body until they contact an outer surface of the movable ring to hold the movable ring in the first angular orientation
Implementation Method 2
When the screw anchor is acted on by a twisting force, the movable ring will be forced to rotate from the first angular orientation to the second angular orientation
Data Source
AI summary
A passive locking chuck for a rotary driver. The chuck has a pair of rings, one fixed and the other rotatable between a first orientation where recesses formed in the rotatable ring are aligned with recesses formed in the fixed ring, and a second orientation where the recesses are offset from one another. When an upper end of a foundation component having a toothed coupler is inserted into the chuck and rotated axially, the movable ring is moved to the second orientation and the foundation component is thereby captured in the chuck. As soon as resistance is encountered from the soil, the ring moves back to the first orientation so that upon reaching the desired embedment depth, the rotary driver may be withdrawn without counter rotation.