External Cargo Door Indicator for Tractor Trailers
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Solution Overview
Problem
Motor vehicle operators, particularly those of tractor trailers, face challenges in visually confirming if the rear door is closed due to its non-visible location from the operating position, leading to potential errors and safety risks during transit.
Innovation Solution
A visual indicator device is positioned on the external surface of the motor vehicle, visible from the driver's side mirror, which illuminates when the rear door is open, utilizing a connector to activate the illumination responsive to the door's open condition, either through a wired or wireless connection to an internal illumination device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dashboard indicator is used to detect open doors, then the operator is warned of open doors, but the indicator can be overlooked among many dashboard indicators and gauges
Solution Approach 1:
The door status indication function is extracted from the dashboard and relocated to an external visual indicator on the vehicle body. This separates the critical door status information from the complex array of dashboard indicators, making it independently visible and impossible to overlook.
Solution Approach 2:
An external visual indicator serves as an intermediary between the door status sensor and the operator. This intermediary provides a dedicated, prominent visual signal that bridges the gap between the mechanical door position and the operator's awareness, without competing with other dashboard elements.
2Reliability
If wires are connected from the cargo carrying section to the cab section to indicate door open condition, then the door status can be indicated, but the system becomes expensive to maintain and unreliable
Solution Approach 1:
The complex wiring system connecting the cargo section to the cab is extracted and replaced with a simplified local sensing mechanism. The door status is detected locally at the door position and indicated externally on the vehicle body, eliminating the need for long wire runs through the coupling mechanism.
Solution Approach 2:
The mechanical wiring system is replaced with an optical or electromagnetic indication system. The door position sensor triggers a visual indicator that can be seen from the driver's position, substituting the mechanical wire connection with a more reliable sensing and indication mechanism.
3Productivity
If the rear access door is positioned for cargo loading, then cargo can be loaded efficiently, but the door becomes non-visible from the operator's position
Solution Approach 1:
An external visual indicator serves as an intermediary that communicates door status to the operator from a distance. This mediator allows the door to remain in its optimal cargo loading position while providing continuous visual feedback to the operator about the door's open or closed state.
Solution Approach 2:
The door status information is transmitted from the rear door position to the front operator position through a third dimension - visual signaling. Instead of requiring direct line-of-sight or physical proximity, the vertical or lateral placement of external indicators on the vehicle body creates a new dimension of information transmission that bridges the spatial gap.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a reliable and visible indication of an open rear door, reducing the risk of errors and ensuring safer operations by ensuring the door is closed before driving, even in busy or rushed environments.
Implementation Method 1
an open door indicator illumination device mounted on the lateral wall between the first lateral wall side and the second lateral wall side
Data Source
AI summary
An indicator device which is positioned to be visible in the side mirror field of view from the operating position of a motor vehicle and configured to indicate when an access door to the motor vehicle is in the open condition.