Telescopic Ladder for Lift Vehicle Access
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Solution Overview
Problem
Existing access systems for lift vehicles, such as telescopic handlers, pose safety risks due to the inability for operators to visually confirm the position of steps when getting on or off, leading to instability and potential falls, especially in dirty environments where traditional ladders are insufficient and cannot be extended without obstructing the vehicle's movement.
Innovation Solution
A telescopic ladder system with movable parts that can be automatically extended and tilted for clear visibility of steps, allowing safe access to the driver's cab by projecting outwards from the vehicle frame, reducing the risk of falls and providing additional support without obstructing the vehicle's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ladder is fixed under the driver's cab, then the structure is simple, but the operator cannot visually confirm the step position leading to safety risks
Solution Approach 1:
The patent applies the dynamics principle by making the ladder movable rather than fixed. The ladder can be automatically extended and tilted to allow operators to visually confirm step positions, thereby improving safety while maintaining operational simplicity through automated control.
Solution Approach 2:
The patent implements dimensionality change by enabling the ladder to tilt and extend in multiple directions. This allows the ladder to project outward from the vehicle frame at optimized angles, providing both visual accessibility for operators and clearance from ground obstacles, thus resolving the safety-visibility contradiction.
2Ease of operation
If the ladder is extended longer to reach the ground, then accessibility improves, but the lower part bumps into ground or obstacles
Solution Approach 1:
The patent uses dynamics by making the ladder extendable and tiltable. The ladder can automatically adjust its length and angle to reach the ground safely, extending only when needed and retracting when the vehicle moves, thus improving accessibility without causing ground obstruction.
Solution Approach 2:
The patent applies preliminary action by automatically extending the ladder before the operator needs to disembark and retracting it before the vehicle moves. This ensures the ladder is in the optimal position for safe access while preventing it from obstructing ground movement or bumping into obstacles during vehicle operation.
3Ease of operation
If the ladder is made telescopic to improve accessibility, then the step reach improves, but the device complexity increases
Solution Approach 1:
The patent implements dynamics through the telescopic ladder mechanism that can automatically adjust its length. This provides improved step reach for operators while the automated control system manages the complexity, making the extended functionality accessible without requiring manual operation of complex mechanisms.
Data Source
AI summary
An apparatus (1) for ascending to the driver's cab of a telescopic handler or the like, including: a ladder (10) which in turn includes at least two parts (11, 12) of which at least one is movable; and an automatic device (3) for moving the movable part (11, 12).