Overhead Cab Door Display Layout for Unobstructed Operator Viewing
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Solution Overview
Problem
Power machines with front entry cabs face interference issues between doors and lift arms, and existing solutions do not adequately address the obstruction of displays when doors are open, affecting operator visibility and access.
Innovation Solution
A cab design with a movable door that opens overhead, incorporating a display mounted on a pillar or frame to maintain visibility and accessibility, using linkages like four-bar linkages to ensure the door and linkages do not obstruct the display, and allowing the display to be oriented for optimal viewing in both closed and open positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the door opens upwardly to avoid interference with the lift arm, then the door clearance is improved, but the display visibility is worsened due to obstruction by the door or linkages
Solution Approach 1:
The display is repositioned from a conventional location to a three-dimensional space above the operator's head and below the door opening, utilizing vertical space to achieve clearance from both the door in closed position and the linkages during door operation. This spatial relocation resolves the contradiction by placing the display in a dimension where it does not intersect with door or linkage paths.
Solution Approach 2:
The display mounting system incorporates adjustable positioning capabilities, allowing the display to be dynamically repositioned or angled to maintain optimal visibility regardless of door position. This dynamic adjustment ensures the display remains accessible to the operator whether the door is closed, open, or in transition, preventing information loss throughout the full range of motion.
2Reliability
If the display is positioned inside the cab, then the display is protected from external elements, but the display obstructs the door movement or operator access when the door opens overhead
Solution Approach 1:
The display is relocated to a vertical position above the operator's head rather than at conventional dashboard or side positions. This three-dimensional repositioning places the display in a protected interior location while simultaneously clearing the horizontal and vertical paths required for door operation and operator movement, eliminating the obstruction problem while maintaining protection.
Solution Approach 2:
The cab interior space is segmented into distinct functional zones: the display occupies the upper vertical space above the operator, while the door and linkage operate in the middle and lower zones. This spatial segmentation allows each component to function independently without interfering with others, maintaining both display protection and operational ease.
3Productivity
If the door is designed to open overhead to clear the lift arm path, then the lift arm travel is improved, but the door and linkages may obstruct the operator's view of the display
Solution Approach 1:
The display is positioned in the vertical dimension above the operator's head, clearing the horizontal plane where door linkages operate during overhead door opening. This vertical placement ensures the display remains visible to the operator throughout the entire door rotation arc while allowing the linkages to move freely in the horizontal and intermediate zones without obstruction.
Solution Approach 2:
The display mounting structure acts as an intermediary element that positions the display in a location simultaneously accessible to the operator and clear of door linkage paths. This intermediary positioning resolves the conflict between lift arm clearance requirements and display visibility by finding a spatial compromise that satisfies both constraints.
Data Source
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AI summary
Disclosed are front entry cabs (250; 350; 450; 550; 650), and power machines (100; 200) with front entry cabs, having a door (324; 424; 524; 624) that is moveable between opened and closed positions and a display (302; 402; 502; 602) oriented in the cab to provide information to the operator both while the door is in the opened and closed positions. In the opened position, the door is positioned within an operator compartment of the cab above the operator seat (364; 464; 564) and below a top (320) of the cab. The display is positioned to not interfere with the door, door linkages (330), or operator joystick control (468).