Paving Stone Interlocking Cam Design for Displacement Protection
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Solution Overview
Problem
Existing laying blocks with spacers fail to provide reliable displacement protection and anchoring, leading to instability and potential shifting of stones in soil covers.
Innovation Solution
A laying block design featuring a base body with first and second cams on opposite side surfaces, where the second cam has sub-cams with varying depths, allowing for interlocking and forming toothing configurations that prevent displacement and tilting, enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional spacers with uniform depth are used, then the structure is simple to manufacture, but displacement protection and anchoring are unreliable
Solution Approach 1:
The second cam is segmented into multiple sub-cams (first sub-cam, second sub-cam, third sub-cam) with different depths arranged in a specific pattern. This segmentation allows each sub-cam to engage with corresponding features on adjacent blocks at different engagement levels, creating multiple restraint points that significantly improve displacement protection while maintaining a manageable structural complexity through modular design
Solution Approach 2:
Different regions of the cam structure have different depths and geometries tailored to specific functions. The first sub-cam has a greater depth than the second sub-cam, which in turn has a greater depth than the third sub-cam. This local variation in geometry creates zones of different restraint strength, with deeper sub-cams providing stronger anchoring in critical areas while shallower sub-cams allow for proper engagement in other areas, thereby improving overall reliability without uniform complexity throughout
2Reliability
If deeper cams are used to improve anchoring, then displacement protection increases, but the risk of tilting increases
Solution Approach 1:
The sub-cams are designed with asymmetric depth relationships where the first sub-cam has a greater depth than the second sub-cam, and the second sub-cam has a greater depth than the third sub-cam. This asymmetric configuration creates a progressive engagement pattern that provides strong anchoring through the deeper first sub-cam while the shallower second and third sub-cams act as stops that prevent excessive rotation, thereby simultaneously improving anchoring and tilting resistance through deliberate geometric asymmetry
Solution Approach 2:
The cam design extends the interaction between adjacent blocks into the depth dimension by creating sub-cams at three different depth levels. This multi-level engagement in the depth dimension allows the structure to resist displacement through deep anchoring while the varying depths create a stepped engagement pattern that inherently resists tilting by providing multiple rotational stops, effectively using dimensional variation to solve both stability requirements simultaneously
3Adaptability or versatility
If uniform spacers are used, then manufacturing is simple, but grass or moss growth is limited
Solution Approach 1:
The second cam is divided into multiple sub-cams with varying depths, which creates non-uniform spacing patterns between adjacent laying blocks. This segmentation produces gaps of different sizes and shapes that can accommodate various vegetation types, with wider gaps allowing for grass and moss growth while maintaining structural integrity through the distributed cam engagement points, thereby improving adaptability for vegetation while keeping the manufacturing process relatively simple
Solution Approach 2:
Specific regions of the cam structure are designed with shallower depths (second and third sub-cams) compared to the first sub-cam, creating local variations in gap size. These local quality differences produce a pattern of gaps that are optimized for vegetation growth in certain areas while maintaining strong mechanical engagement in other areas, allowing vegetation adaptability enhancement without requiring complete redesign of the entire spacer system
4Adaptability or versatility
If multiple cam configurations are provided, then various laying patterns are enabled, but the kit requires more component types
Solution Approach 1:
The laying block design incorporates multiple sub-cams with different depths on each block, making each individual block capable of participating in multiple laying patterns. The first sub-cam with greater depth can engage with blocks in various orientations, while the second and third sub-cams provide additional engagement options. This multi-functionality within each block allows a single block type to support diverse laying configurations, achieving high adaptability without requiring multiple different block types in the kit
Data Source
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AI summary
The invention relates to a paving stone (1) for creating a soil covering, comprising a base body (10) with a top (12), bottom (14), and side surfaces (20, 30, 40, 50) parallel to the stone height (16). At least one first lug (62, 64, 66) is arranged on at least one side surface (20, 40, 50), and at least one second lug (72) is arranged on at least one further side surface (30). The depth of the at least one second lug is at least twice the depth of the at least one first lug, wherein an end face (71) of the at least one second lug (72) has at least two sub-lugs (82, 84) separated by a recess (86).According to the invention, the at least two sub-cams (82, 84) each have a different depth, with at least one flank of one of the sub-cams (82, 84) forming a displacement stop for a first cam (62, 64, 66) or a sub-cam (82, 84) of another paving stone (1) laid opposite it as intended. The shape and arrangement of the at least two sub-cams (82, 84) are complementary to first cams (62, 64, 66) and complementary to sub-cams (82, 84). In the case of paving stones (1) arranged adjacent to each other as intended, an interlocking (132, 133) can be formed either between two opposing sub-cams (82, 84) or between first cams (62, 64, 66) and sub-cams (82, 84).