Modular Rumble Strips Dovetail Connection
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Solution Overview
Problem
Existing portable rumble strips lack durability and ease of use in various roadway conditions, particularly in heavy-duty high-speed applications and lighter-duty lower-speed scenarios, and fail to provide a secure connection between modular sections.
Innovation Solution
Modular rumble strips made of flexible polymeric materials like rubber or polyurethane with alternating notches and tabs for a dovetailed connection, along with transverse slots and cross-members for secure engagement, and optional ballast plates for added stability, allowing for easy assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If modular strip sections are connected using simple tabs and notches, then assembly is easy, but connection strength and stability are insufficient for heavy-duty applications
Solution Approach 1:
The rumble strip is divided into multiple modular strip sections that can be independently handled and assembled. Each section contains integrated tabs and notches that enable simple interconnection while maintaining overall system strength through multiple connection points along the length of the sections.
Solution Approach 2:
The strip sections are made from composite material structures combining rigid polymeric material for structural integrity with flexible polymeric material for cushioning and vibration generation. This composite construction provides both ease of assembly through flexible edges and sufficient connection strength through rigid internal structures.
2Stability of the object's composition
If rumble strips are made rigid for stability, then they remain in place under heavy duty conditions, but they adversely affect vehicle stability and alarm drivers
Solution Approach 1:
The rumble strip utilizes parameters of flexibility and rigidity by combining rigid polymeric material for structural stability with flexible polymeric material for vehicle contact. The flexible material allows the strip to deform under vehicle loads, generating vibration warnings without transmitting excessive forces that would alarm drivers or affect vehicle stability.
Solution Approach 2:
The strip sections are constructed from flexible polymeric material that can bend and deform under vehicle tires, creating the characteristic rumble vibration. This flexibility allows the strip to adapt to roadway conditions and vehicle loads while maintaining its warning function, unlike rigid structures that would transmit harmful vibrations to vehicles.
3Reliability
If rumble strips are designed for heavy-duty high-speed applications, then they provide adequate warning, but they are not adaptable to lighter-duty lower-speed scenarios
Solution Approach 1:
The modular strip section design enables adaptability to different applications by allowing users to connect varying numbers of sections based on the specific roadway condition and traffic requirements. Sections can be configured for heavy-duty high-speed applications using more sections, or for lighter-duty lower-speed scenarios using fewer sections, providing versatility across different operational conditions.
Solution Approach 2:
The rumble strip design incorporates dynamic characteristics through flexible polymeric material that allows the strip to adapt its response to different vehicle speeds and loads. The flexible material enables the strip to generate appropriate vibration warnings whether subjected to high-speed heavy-duty traffic or lower-speed lighter-duty traffic, providing reliable performance across varying conditions.
4Strength
If rumble strips use complex connection mechanisms for secure joints, then connection strength improves, but assembly time and complexity increase
Solution Approach 1:
The tab and notch connection mechanisms are integrally formed as part of the strip section structure itself, eliminating the need for separate fasteners or complex assembly mechanisms. The tabs protrude directly from one end of each section while notches are formed at the corresponding ends, allowing sections to be quickly connected by simple alignment and engagement, providing both strength and speed in assembly.
Data Source
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AI summary
A portable roadway warning device comprises one or more rumble strips. Each rumble strip comprises at least two interconnected strip sections, each made of a polymeric material. Opposite end edges of the strip sections have respective alternating notches and tabs sized and spaced for engagement with respective tabs and notches on opposite end edges of other of the strip sections to provide a releasable connected joint therebetween. The undersides of the tabs have transverse slots adjacent axial inner ends of the tabs for seated engagement by lower outer cross members extending transversely of the notches adjacent axial outer ends of the notches. The alternating notches and tabs in the respective opposite end edges of the strip sections are dovetailed for dovetailed engagement with one another.