Pivotable School Bus Stop Sign Arm
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Solution Overview
Problem
Children entering or exiting school buses often fail to check for oncoming traffic, and impatient drivers may pass the bus while loading or unloading children, posing safety risks.
Innovation Solution
A safety device comprising a pivotable STOP sign with an extendable arm and lights is mounted on a school bus, extending into the adjacent lane to warn approaching vehicles and enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a STOP sign is mounted on the school bus, then visibility and warning capability are improved, but the device complexity and structural requirements increase
Solution Approach 1:
The STOP sign is made pivotable rather than fixed, allowing it to rotate between a horizontal position (when not needed) and a vertical position (when warning is required). This dynamic configuration enables the same structure to serve both as a compact mounting and an extended warning device, resolving the contradiction between reliability improvement and structural complexity.
Solution Approach 2:
The STOP sign assembly is divided into separate functional components: a mounting bracket attached to the bus, a pivotable arm that can rotate, and the STOP sign itself. This segmentation allows each component to be optimized independently and simplifies the overall structure while maintaining the warning capability.
2Length of stationary object
If an extendable arm is added to the STOP sign, then the warning reach and visibility are improved, but the device complexity and mounting requirements worsen
Solution Approach 1:
The extendable arm function is merged with the existing STOP sign mounting structure. The pivotable arm serves dual purposes: it acts as both the mounting support for the STOP sign and the extendable element that increases warning reach. This merging eliminates the need for separate extendable mechanism components, reducing mounting complexity while achieving extended reach.
Solution Approach 2:
The arm is designed to be pivotable rather than permanently extended, allowing it to dynamically adjust between a retracted position (reducing complexity and wind resistance) and an extended position (maximizing warning reach). This dynamic capability resolves the contradiction by providing extended reach only when necessary.
Data Source
AI summary
In one instance, a safety device is mounted to an exterior side of a school bus. The safety device includes a mounting bracket configured for coupling to a mounting motor, with the mounting bracket being moveable between a undeployed position and a deployed position by the mounting motor. An arm portion is coupled to the mounting bracket. The arm portion has a proximal end and a distal end, with the proximal end being coupled to the mounting bracket. The safety device further includes a plurality of lights coupled to the arm portion.