Movable Ladder Device Single Axis Rotation Mechanism
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Solution Overview
Problem
Existing ladder devices for construction machinery vehicles have complex structures and increased costs due to multiple axes and actuators, and they struggle to rotate within a compact actuation range, especially when obstacles are present, and cannot be rotated when an obstacle is nearby.
Innovation Solution
A movable type ladder device using a single rotational center axis perpendicular to the ladder's extended direction in both boarding and retracted postures, with a drive mechanism and up-and-down lock device, allowing the ladder to be rotated 90 degrees for retraction while maintaining adjacency to the vehicle body, and utilizing a mount frame for accurate component placement and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two axes and two actuators are provided for rotating the ladder main body, then the ladder can be moved between boarding and retracted postures, but the structure becomes complicated and cost increases
Solution Approach 1:
The patent merges two separate rotation operations (about first axis and second axis) into a single rotation operation about one axis. The ladder main body is designed to rotate 90 degrees about a single axis that is slanted forwardly, combining what would otherwise require two separate actuators and two axes into one integrated motion path.
Solution Approach 2:
The patent employs a slanted axis configuration where the axis is inclined at an angle between 10 and 70 degrees from the horizontal. This dynamic geometric arrangement allows the ladder to achieve both vertical lifting and horizontal retraction through a single rotation, adapting the motion path to accomplish multiple objectives simultaneously.
2Device complexity
If a single horizontal axis is used for rotation, then the structure is simplified, but the ground-side end portion rotates farther away from the vehicle body requiring more space
Solution Approach 1:
The axis is configured to be slanted forwardly at an angle between 10 and 70 degrees from the horizontal, creating a dynamic motion path that keeps the ground-side end portion closer to the vehicle body during rotation. This angular configuration optimizes the rotation arc to reduce the required actuation range while maintaining structural simplicity.
3Ease of operation
If the ground-side end portion rotates away from the vehicle body by a large radius, then the ladder can be retracted, but it cannot rotate when obstacles exist in the surrounding of the vehicle
Solution Approach 1:
The slanted axis configuration creates a compact rotation arc that keeps the ladder main body closer to the vehicle body throughout the retraction motion. By positioning the axis such that it is slanted forwardly at an angle between 10 and 70 degrees from the horizontal, the ground-side end portion follows a more compact path that avoids obstacles in the surrounding environment.
Data Source
AI summary
A movable type ladder device for a work vehicle includes a ladder main body, a drive mechanism, and an up-and-down lock mechanism. The ladder main body has first and second end portions in a longitudinal direction thereof with the first end portion being rotatably supported with respect to the vehicle body. The drive mechanism is configured to move the ladder main body between a boarding posture and a retracted posture by rotating the ladder main body at an angle of 90 degrees. The up-and-down lock mechanism is configured to restrict the ladder main body set in the retracted posture from moving in an up-and-down direction. The rotational center axis is disposed perpendicularly to the longitudinal direction of the ladder main body set in the boarding posture in a front view, and perpendicularly to the longitudinal direction of the ladder main body set in the retracted posture in a plan view.