Load-Handling Cab Layout for Low-Step Access and Visibility
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Solution Overview
Problem
Existing load handling machines require multiple access steps to the cabin, increasing the risk of driver falls and muscle fatigue while maintaining good peripheral visibility.
Innovation Solution
The machine design includes a cabin with a minimum inner height greater than 1705 mm at the SIP seat location, a distance between the SIP seat and the cabin floor of at least 650 mm, and a single access step or no steps, which allows a semi-debout driver position, maintaining peripheral vision and reducing access steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a raised cabin is used to provide high peripheral visibility, then the driver's peripheral vision is improved, but the risk of falling and muscular fatigue increases due to multiple access steps
Solution Approach 1:
The patent changes the vertical positioning parameters of the cabin by lowering the floor to ground distance to less than 800 mm while maintaining an increased interior height greater than 1705 mm at the SIP reference point. This parameter transformation allows the cabin to provide adequate peripheral visibility through its extended side faces while eliminating the need for multiple access steps, thereby reducing the risk of falling.
2Illumination intensity
If a raised cabin is used to provide high peripheral visibility, then the driver's peripheral vision is improved, but muscular fatigue increases due to frequent climbing of access steps
Solution Approach 1:
The patent transforms the cabin's vertical dimensions by implementing a floor to ground distance of less than 800 mm combined with an interior height greater than 1705 mm at the SIP reference point. This dimensional transformation enables the driver to access the cabin easily without frequent climbing, reducing muscular fatigue while the extended side faces maintain good peripheral visibility.
3Reliability
If the cabin floor is lowered to reduce access steps, then the risk of falling and muscular fatigue are reduced, but the driver's peripheral visibility may be impaired
Solution Approach 1:
The patent simultaneously optimizes two parameters: the floor to ground distance is reduced to less than 800 mm to minimize access steps and falling risk, while the interior height at the SIP reference point is increased to greater than 1705 mm. This dual parameter adjustment allows the cabin to extend its side faces horizontally to maintain peripheral visibility without requiring a high floor position.
4Ease of operation
If the cabin interior height is increased to maintain driver comfort in semi-standing position, then driver comfort is improved, but the overall machine height may exceed road clearance limitations
Solution Approach 1:
The patent resolves the height constraint by transitioning from vertical to horizontal dimensioning. Instead of increasing the overall machine height, the cabin extends its side faces horizontally to provide adequate interior height greater than 1705 mm at the SIP reference point while keeping the floor to ground distance low (less than 800 mm). This dimensional shift allows driver comfort in semi-standing position without exceeding road clearance limitations.
Data Source
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AI summary
Load-handling vehicle (1) comprising a chassis (2), a handling system (4) comprising a lifting arm (5) mounted so as to move between a high and a low position and a driver's cab (3) comprising a floor (6), a ceiling (7), a front face (8), an opposite rear face (9) and two side faces (10, 11), one (10) of the side faces (10, 11) being provided with an opening (12) for accessing the cab (3), and the other side face (11) being adjoined by the lifting arm (5) at least in the low position of the arm (5), the cab (3) being provided with a seat (13) and having at least one seat index point (SIP) established and defined in accordance with international standard ISO 5353:1995. The cab (3) has a minimum interior height, measured between the floor (6) and the ceiling (7), that is greater than 1705 mm, and a distance between the floor (6) and the ground that is less than 800 mm, and the distance between the seat index point and the floor (6) of the cabin (3) is at least equal to 650 mm.