Construction Machine Ladder With Coupling Member Retracting Handrail
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Solution Overview
Problem
Existing ladder devices for construction vehicles have hand railings that protrude outward when in the retracted posture, risking damage from obstacles and restricting placement due to the protrusion, especially when positioned at the rear of the vehicle, increasing the likelihood of contact with obstacles during vehicle operation.
Innovation Solution
A movable ladder device with a coupling member that pivots the hand railing inward when the ladder is retracted, ensuring the hand railing is positioned within the vehicle body, utilizing a hydraulic cylinder and link mechanisms to smoothly transition between deployed and retracted postures, with pivot shafts and fulcrums strategically positioned to prevent protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the hand railing is fixed to the vehicle body and the ladder main body is made movable, then the ladder can be deployed and retracted, but the hand railing protrudes outward when the ladder is retracted, risking damage from obstacles
Solution Approach 1:
The hand railing is designed to be movable rather than fixed, allowing it to change position relative to the vehicle body. The coupling member enables the hand railing to pivot between extended and retracted positions, dynamically adapting to the ladder's deployment state and preventing protrusion when retracted.
Solution Approach 2:
The hand railing system is divided into separate components: the hand railing itself, the coupling member, and the pivot shafts. This segmentation allows independent movement and positioning of the hand railing relative to both the vehicle body and the ladder main body, enabling it to avoid obstacles while maintaining functionality.
2Ease of operation
If the hand railing protrudes outward of the vehicle body, then it provides better support for climbing, but it restricts placement options and increases contact risk with obstacles
Solution Approach 1:
The hand railing transitions from a static protruding structure to a dynamic component that can adjust its position. When deployed, it extends outward to provide climbing support; when retracted, it moves inward to avoid obstacles and expand placement options, resolving the contradiction between support quality and placement flexibility.
Solution Approach 2:
The coupling member serves multiple functions: it connects the hand railing to the ladder main body, enables relative movement between them, and positions the hand railing optimally for both deployed and retracted states. This multi-functionality allows the system to maintain climbing support while gaining placement versatility.
Data Source
AI summary
A ladder device includes a ladder main body, a hand railing, a driving mechanism and a coupling member. One end of the coupling member is pivotably supported by the ladder main body, while the other end thereof is pivotably supported by the hand railing. The coupling member is configured to: position the hand railing between the ladder main body and a walkway when the ladder main body takes the deployed posture; pivot the hand railing in conjunction with a pivot action of the ladder main body from the deployed posture to the retracted posture; and position the hand railing further inwards of the vehicle body than the ladder main body is when the ladder main body takes the retracted posture.