Shed Roofing Structure With Receiving Plates for Rafter Alignment
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Solution Overview
Problem
In shed roofing structures with corner and valley sections, the installation of oblique members such as corner and valley rafters requires complex notch grooves on transverse and vertical members, leading to potential strength reduction and alignment issues, especially when different woodworking machines are used, potentially violating building height regulations.
Innovation Solution
A shed roofing structure with receiving plate members that support common, corner, and valley rafters, featuring inclined surfaces and notch grooves formed on the plate members rather than the transverse or vertical members, ensuring aligned reference heights and simplified processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If notch grooves are formed on transverse rafters and vertical members to receive corner and valley rafters, then the oblique members can be installed, but the structure strength of the transverse rafters and vertical members is reduced due to sectional breaking
Solution Approach 1:
The patent divides the support function into two parts: the transverse rafter provides primary support, while a separate plate member installed on top of the transverse rafter provides the notch groove interface for corner and valley rafters. This segmentation prevents the notch groove from weakening the transverse rafter's structural integrity.
Solution Approach 2:
The plate member acts as an intermediary element between the transverse rafter and the corner/valley rafters. It transfers the load from the oblique members to the transverse rafter without requiring direct notch groove cutting into the rafter itself, thus preserving the rafter's strength.
2Ease of operation
If notch grooves are formed on transverse rafters and vertical members for corner and valley rafters, then the oblique members can be installed, but the processing becomes time consuming due to complicated groove shapes
Solution Approach 1:
The patent separates the complex notch groove requirement from the transverse rafter by introducing a dedicated plate member. This plate member can be pre-fabricated with standardized simple groove shapes, avoiding time-consuming on-site processing of complex grooves in the rafters themselves.
Solution Approach 2:
Instead of creating complex unique groove shapes directly on each rafter, the patent uses a standardized plate member design that can be replicated. The plate member serves as a template or copy that simplifies the interface geometry, reducing processing complexity and time.
3Adaptability or versatility
If different woodworking machines are used with different reference points for rafter notches, then various machine types can be utilized, but the utmost height of the building may conflict with height limitation according to the Building Standards Act
Solution Approach 1:
The plate member serves as a universal interface component that standardizes the connection between transverse rafters and oblique members. By providing a common reference surface and standardized groove positions on the plate member, it ensures consistent building height regardless of which woodworking machine is used to process the rafters.
Solution Approach 2:
The patent changes the reference parameter for height control from the rafter notch position (which varies with different machines) to the plate member top surface position (which can be consistently controlled). This parameter change decouples the height reference from the variable machine processing points, ensuring uniform building height.
Data Source
AI summary
A shed roofing structure includes: a corner rafter in which a top surface and a bottom surface form a mountain profile having a width-direction center as the vertex, the corner rafter exhibiting a fletched profile as seen in cross-section; a valley rafter formed by vertically inverting the corner rafter; a plurality of common rafters which are disposed horizontally spaced apart at a flat section of the inclined roof and inclined along a roof gradient; and a receiving plate member that is placed on respective top surfaces of an elongate transverse rafter which intersects the plurality of common rafters and supports at least the plurality of common rafters and the valley rafter from below, and a vertical member which supports the corner rafter from below, and that receives the corner rafter, the valley rafter, and the common rafters.