Y-Shaped Access System for Dump Truck Operator Safety
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Solution Overview
Problem
Existing access systems for large work machines, such as dump trucks, pose safety concerns due to the need for personnel to climb in front of the radiator, which is undesirable from a technical safety perspective, and often obstruct the operator's view, while also not meeting stringent safety demands.
Innovation Solution
A Y-shaped access system with an intermediate stand and steps leading to the upper deck, where personnel can climb onto the stand from the front and choose sides to access the deck, ensuring a safe and unobstructed view for the operator, incorporating hydraulically actuable steps and emergency ladders for safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If personnel climb onto the work machine in front of the radiator, then access to the upper deck is achieved, but technical safety is compromised due to proximity to the radiator
Solution Approach 1:
The access system is divided into multiple segments: a first intermediate stand at bumper level, a second intermediate stand at upper deck level, and connecting steps. This segmentation allows personnel to access the upper deck without climbing in front of the radiator, as the steps approach from the side/rear direction, thereby resolving the safety contradiction while maintaining ease of access.
2Ease of operation
If an access system is arranged in front of the operator's cabin, then personnel can access the upper deck, but the operator's view is impeded
Solution Approach 1:
The access system is positioned in the depth dimension (front-to-rear axis) rather than obstructing the lateral view. The intermediate stands and steps are arranged along the vehicle's length, allowing personnel to approach and ascend without blocking the operator's lateral field of view, thus resolving the contradiction between accessibility and visibility.
3Ease of operation
If steps are arranged to lead to the upper deck, then personnel can access the deck, but handrails may protrude into the operator's field of view
Solution Approach 1:
The handrails are specifically positioned at the intermediate stands located at the rear or side of the operator's cabin, not in the direct forward view path. The local arrangement of handrails at these specific positions provides climbing support while maintaining clear visibility for the operator, resolving the contradiction between safety and visibility.
4Ease of operation
If a lowerable step part is added to extend steps from bumper to ground, then accessibility is improved, but device complexity increases
Solution Approach 1:
The step part is designed to be movable (lowerable/liftable) rather than fixed, allowing it to adapt between a lowered position for ground access and a raised position integrated with the bumper. This dynamic configuration provides ground-level accessibility while maintaining a compact structure when not in use, balancing improved ease of operation with controlled device complexity.
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 safe and comfortable access system that maintains the operator's view and meets safety standards by ensuring consistent step inclination and positioning handrails to avoid obstructing the operator's view, while also providing emergency access options.
Implementation Method 1
a lowerable step part, which is preferably hydraulically actuable, can adjoin the steps directed to the front in the direction of travel and extends the steps as required from the bumper down to the ground
Data Source
AI summary
The present invention relates to a work machine, in particular in the form of a dump truck or of a truck, having an upper deck which can be walked on arranged at the front above a bumper and having an operator's cabin arranged laterally on the upper deck with at least one step-like access system arranged in front of the operators cabin. In accordance with the invention, an intermediate stand lowered with respect to the upper deck is arranged in front of the operator's cabin and steps lead in each case laterally to the upper deck from this while steps lead at least to the bumper from the intermediate stand to the front in the direction of travel.