Cantilevered Pergola Bracket Assembly Without Ground Support
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Solution Overview
Problem
Conventional pergolas and trellises require ground-level support posts that occupy space and disrupt the continuity of open areas, making them unsuitable for certain applications.
Innovation Solution
A bracket system that attaches pergola beams to existing roof rafters, allowing them to be cantilevered without ground-level support, using a single-piece bracket fabricated from a cut and bent material, with a mounting assembly, support assembly, and connecting assembly to secure the beams to the roof rafters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional pergolas use vertical posts secured to ground surface, then structural support is provided, but ground space is occupied and discontinuities are created
Solution Approach 1:
The pergola structure transitions from ground-level support to roof-rafter support, moving the support plane from horizontal (ground) to vertical (roof structure). This dimensional change allows the pergola to extend over ground space without occupying it, eliminating discontinuities while maintaining structural integrity through the bracket system attached to roof rafters
2Area of stationary object
If pergola beams are cantilevered from roof rafters, then ground space is maintained open, but attachment to roof structure must be secure
Solution Approach 1:
The bracket system is divided into distinct functional assemblies: a mounting assembly for attaching to the rafter, a support assembly for securing the pergola beam, and a connecting assembly that suspends the support from the mounting. This segmentation allows each component to be optimized for its specific function while working together to provide secure cantilevered support
Solution Approach 2:
The bracket is fabricated from a single piece of material that is cut and bent into a suitable configuration, creating curved and angled surfaces that conform to both the roof rafter geometry and the pergola beam. This monolithic curved design provides structural strength while ensuring secure attachment without ground support
3Ease of manufacture
If bracket is fabricated from single piece of material, then manufacturing cost is reduced, but fabrication complexity increases
Solution Approach 1:
Multiple functional components (mounting plate, support structure, connecting elements) are merged into a single monolithic bracket fabricated from one piece of material. This consolidation eliminates the need for separate parts and assembly steps, reducing manufacturing cost and simplifying production despite the complexity of the bending and forming operations required
Data Source
AI summary
A bracket system, for suspending pergola beams from an existing structure, the existing structure having a vertical wall and roof rafters that each have a rafter top and a rafter end that extends beyond the vertical wall over a ground surface, each of the pergola beams having a supported end, including a plurality of brackets. Each bracket having a mounting assembly for attaching to one of the rafters, a support assembly for attaching the support end of one of the pergola beams, and a connecting assembly that suspends the support assembly from the mounting assembly. The pergola beams extend over the ground surface, away from the existing structure, supported only by the bracket at the support end and without any vertical supports.