Pivotable Cab Door with Inclined Step for Track-Mounted Construction Machines
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Solution Overview
Problem
The accessibility of operator's cabs in construction machines with tracks is a safety concern due to the need to step on tracks, which are often dirty, and results in dirt entering the cab, making existing solutions unsatisfactory.
Innovation Solution
An operator's cab arrangement with a pivotable door that swings open, utilizing a tread for safe entry and exit, and an asymmetrical design that avoids stepping on tracks, while maintaining a clean environment by preventing dirt entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the operator's cab is completely closed to prevent dust entry and enable air conditioning, then the protection from dust and environmental control is improved, but the accessibility for entering and exiting the cab deteriorates
Solution Approach 1:
The operator's cab is segmented into a fixed closed structure and a movable door component. The door is divided into a main door panel and an integrated step, allowing the cab to maintain its closed protective structure while providing a separate access mechanism that doesn't compromise the sealing when closed.
Solution Approach 2:
The door is designed with an inclined orientation relative to the vertical axis of the cab, creating a ramp-like step that extends downward toward the track level. This dimensional change allows operators to access the cab from a lower position without compromising the closed structure, as the inclined step provides a gradual transition rather than a vertical climb.
2Ease of operation
If operators step on the upper area of tracks to enter the cab, then the accessibility is improved, but the safety is worsened due to the dirty and unstable surface
Solution Approach 1:
The door step acts as an intermediary element between the track level and the cab floor. It provides a dedicated, stable, and cleaner surface for foot placement that is specifically designed for access purposes, eliminating the need to step directly on the track structure which is contaminated with dirt and debris.
Solution Approach 2:
The step is pre-positioned and pre-configured as part of the door structure, ready before the operator needs to access the cab. The inclined design is built-in, so operators don't need to search for or create an access path; the safe stepping surface is already prepared and positioned optimally for entry.
3Ease of operation
If operators step on tracks covered by dirt to access the cab, then the accessibility is improved, but the cleanliness of the cab interior deteriorates due to dirt entry
Solution Approach 1:
The door step serves as a buffer zone and transition surface between the dirty external environment and the clean cab interior. By positioning the step as part of the door assembly that seals when closed, it intercepts dirt and debris before they can be tracked inside, allowing operators to step on a designated surface that minimizes contamination of the cab interior.
Solution Approach 2:
The step area is differentiated from the main cab floor in terms of function and positioning. It is located at the threshold zone where external contaminants are most likely to enter, and its inclined design and positioning create a natural barrier that prevents dirt from being carried further into the clean interior space.
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
Enhances safety and prevents dirt from entering the cab by providing a safe and clean access route for operators, meeting safety requirements and maintaining a dust-free environment.
Implementation Method 1
at least one of the side wall elements is closable by a door element which is pivotably mounted to said arrangement with a pivot axis being substantially vertical
Implementation Method 2
The door element is inclined towards a central axis of said construction machine when closed
Data Source
AI summary
An operator's cab arrangement for a construction machine (100) is proposed which comprises side wall elements, a front wall element, a rear wall element and a roof element (4). At least one of said side wall elements is closable by a door element (1) which is pivotably mounted to said arrangement with a pivot axis being substantially vertical with respect to said construction machine (100). Said door element (1) is inclined towards a central axis of said construction machine when closed.