L-Shaped Crib Wall Stretchers for Smooth Front Face
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Solution Overview
Problem
Existing crib wall structures face inefficiencies in material usage, aesthetic issues due to exposed headers, and difficulties in achieving a smooth front face, particularly when made from timber or heavy concrete materials.
Innovation Solution
A crib wall structure using polymeric materials, specifically recycled plastics, with 'L', 'C', 'U', or 'T' shaped front end stretchers that interconnect with headers via pins and spacer blocks, allowing for efficient manufacturing, reduced material usage, and a smooth front face, while accommodating longitudinal expansion and aesthetic considerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If headers extend beyond stretchers to both front and rear with notches, then strong structure is achieved, but effective depth of wall is reduced and material usage efficiency is reduced
Solution Approach 1:
The stretcher is divided into two distinct portions: an upright portion that provides the vertical support and a rearward directed portion that extends backward to engage with the header. This segmentation allows each portion to fulfill its specific function efficiently, with the upright portion contributing to wall height and the rearward portion providing structural connection, thereby optimizing material usage while maintaining strength.
Solution Approach 2:
The stretcher design transitions from a simple horizontal member to an L-shaped member with both vertical and horizontal components. By adding the vertical dimension through the upright portion, the structure achieves both the necessary connection function (through the rearward portion) and improved material efficiency (through the vertical orientation that contributes to wall height without requiring additional header extension).
2Strength
If headers are made from swan timber, then structural requirements are met, but aesthetic appeal is reduced and additional finishing processes are required
Solution Approach 1:
The material parameter is changed from natural timber to molded plastic, which inherently provides a smooth, uniform surface finish without the grain patterns and irregularities of timber. This material substitution eliminates the need for additional aesthetic finishing processes like painting or staining, while still achieving the required structural performance through appropriate design and connection mechanisms.
3Ease of operation
If notches are cut in headers, then stretcher connection is enabled, but height of each course is reduced
Solution Approach 1:
Instead of cutting material away from the header (which would reduce its height), the connection mechanism is inverted: the stretcher itself is designed with a rearward directed portion that actively engages with the header. This approach maintains the full height of both components while achieving secure connection, effectively reversing the traditional approach where the header was modified to accommodate the stretcher.
4Strength
If front ends of headers are exposed, then structural function is fulfilled, but visual appearance is compromised and smooth front face cannot be achieved
Solution Approach 1:
The functional requirement of header exposure is extracted and relocated: the header's connection function is maintained through the rearward directed portion of the stretcher engaging with it, but the header itself is taken out of the visible front face area. The upright portion of the stretcher now occupies the front position, providing both the necessary structural support and a smooth, continuous front surface that eliminates visual discontinuities.
Data Source
Figure 1~2
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AI summary
A crib wall structure (12) includes a plurality of tiers of stretchers (14a, 14b) and headers (16) arranged for containing an in-fill material to form a crib wall. The stretchers (14a, 14b) are aligned longitudinally of the wall whilst the headers (16) are aligned perpendicular to the stretchers and arranged in a plurality of columns (18) spaced apart along the length of the wall. At the front face, front end stretchers (14a) span lengthways to interconnect front end regions of associated headers in adjacent columns in a tier. In an embodiment, the front end stretchers (14a) have a generally upright portion (22) and at least one rearward directed portion (24) and may be substantially 'L' shaped. The stretchers and headers may be extruded from recycled plastics and interconnected by means of pins. The front end stretchers (14a) may be arranged in a 'checkerboard' pattern with the front end stretchers in adjacent wall sections being off-set.