Threaded Extension Nut for Short Anchor Bolt Mudsill Connections
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Solution Overview
Problem
Existing methods for securing construction lumber to concrete foundations using anchor bolts of insufficient length require labor-intensive and structurally compromising modifications to the mudsill, such as gouging, which can lead to integrity issues and inspection failures.
Innovation Solution
A threaded extension nut with internal and external threading, allowing secure engagement with both the anchor bolt and mudsill without altering the mudsill, ensuring a stable connection that meets building codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If anchor bolts of insufficient length are used, then the connection between concrete foundation and lumber becomes impossible with standard nuts, but modifying the mudsill to accommodate the bolts requires labor-intensive gouging that compromises structural integrity
Solution Approach 1:
The extension nut serves as an intermediary component between the insufficiently long anchor bolt and the standard nut. It has internal threading that engages with the anchor bolt threads and external threading that engages with the standard nut, effectively extending the functional length of the bolt without modifying the mudsill. This resolves the contradiction by enabling connection with short bolts while preserving mudsill integrity.
Solution Approach 2:
The connection system is segmented into distinct functional components: the anchor bolt, the extension nut, and the standard nut. The extension nut is a separate, removable component that bridges the length gap, allowing the system to adapt to varying bolt lengths without permanently modifying the mudsill structure.
2Ease of operation
If labor-intensive gouging of the mudsill is performed to accommodate insufficient anchor bolts, then connection becomes possible, but installation time and labor requirements increase significantly
Solution Approach 1:
The extension nut eliminates the need for gouging by providing a threaded interface that accommodates short anchor bolts. Workers simply thread the extension nut onto the bolt, then attach the standard nut, completing the connection without any cutting or modification of the mudsill, thereby saving significant installation time.
Solution Approach 2:
The extension nut is designed to be self-installing through simple threading operations. The internal threading engages with the anchor bolt threads, and the external threading engages with the standard nut, allowing the component to serve its function without requiring external modification or complex installation procedures.
3Ease of operation
If gouging is performed on the mudsill to accommodate short anchor bolts, then the connection can be made, but the structural integrity and code compliance are compromised
Solution Approach 1:
The extension nut acts as a mediator that enables connection adaptability to various anchor bolt lengths without requiring any modification to the mudsill. This preserves the factory-applied preservatives and structural integrity of the wood, ensuring code compliance while maintaining ease of operation across different installation scenarios.
Solution Approach 2:
Instead of modifying the mudsill to accommodate the bolt (traditional approach), the invention inverts the approach by using a threaded extension component that adapts to the existing bolt and mudsill configuration, thereby preserving the integrity of the structural elements while achieving the same connection goal.
Data Source
AI summary
A threaded extension nut for engaging a threading of an anchor bolt for cement-to-lumber connections includes a shaft member with a first end attached to a head and a second end configured to connect to a threaded bolt. The shaft member includes an internal threading, an external chamfer, and an internal chamfer. The apparatus, as claimed, may include a head designed to connect to a tool for applying rotational force. It may also feature a flange providing a locking surface. The threaded opening in the shaft member may extend fully through, at least halfway through, or partially through the shaft member. The shaft member may also include an exterior threading to mate with a mudsill and help maintain a tight threaded extension nut to mudsill connection.