Deck Post Brackets for Joist Lever-Force Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for securing deck rail posts to joists often fail to meet stringent building code requirements for strength and stability, particularly where fasteners into the end grain of joists are insufficient to resist lever forces, and traditional hardware connectors are not always practical or effective.
Innovation Solution
The use of brackets with flange sections and plate structures that securely attach to both the post and joists, providing additional fastening points and preventing lateral and perpendicular movement of the post, thereby enhancing the structural integrity of the deck rail system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional fasteners (nails and screws) are used to attach rim joist to floor joists, then the installation process is simple, but the connection strength is insufficient to resist lever forces applied to the post
Solution Approach 1:
The patent introduces a metal connector as an intermediary component between the rim joist and floor joists. This connector serves as a mediator that transforms the weak nail/screw connection into a strong mechanical interlock, allowing the rim joist assembly to resist lever forces from posts without requiring complex multi-step fastening procedures
Solution Approach 2:
The connection system is segmented into distinct functional components: the metal connector itself, the rim joist, and the floor joists. This segmentation allows each component to be optimized independently - the connector provides strength through its geometry and fastening points, while the wooden joists maintain their structural roles, resolving the contradiction between simple installation and strong connection
2Strength
If hardware connectors are used to transfer post forces directly to floor joists, then the connection strength improves, but the device complexity and installation difficulty increase
Solution Approach 1:
The metal connector is designed as a universal component that performs multiple functions simultaneously: it connects the rim joist to floor joists, provides attachment points for posts, and resists lever forces in multiple directions. This multi-functionality eliminates the need for separate hardware connectors for each purpose, simplifying installation while maintaining strength
Solution Approach 2:
The patent merges the functions of rim joist attachment and post mounting into a single integrated metal connector assembly. By combining these functions, the system achieves strong force transfer capability without requiring multiple separate hardware components, thereby maintaining installation ease
3Shape
If posts are mounted inside the rim joist, then the post sleeves and base trim can rest flat on the decking, but the installation becomes more difficult and post dislocation risk increases
Solution Approach 1:
The metal connector acts as an intermediary framework that enables outside-the-rim post mounting while achieving the same visual result as inside mounting. The connector provides structural support and alignment references that allow posts to be correctly positioned outside the rim joist without risking dislocation, eliminating the need for complex inside mounting procedures
Data Source
AI summary
A mounting device for a deck post in the shape of a square tubular member polygonal planar side elements and one or more an attachment members extending from the top of the tubular member and which form grooves that are sized and spaced to receive structural joists, and at least one sidewall having a top ledge for the support of decking, and at least one retaining tab extending perpendicular from the bottom edge of the tubular members to retain a post member inserted into the tubular member.