Pivotable Crane Staircase with Caster Support for Stable Operator Access
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Solution Overview
Problem
Operators of mobile crane systems face safety hazards while accessing elevated cabins due to the limited reach of vertical ladders, which can lead to falls and instability when opening doors, as they must lean and balance on narrow rungs or handholds.
Innovation Solution
A selectively attachable staircase with a mounting bracket and handrails that extends laterally from the crane deck, allowing for stable entry into the operator's cabin, accommodating crane movements, and featuring a pivotable design with casters for ground support and a locking mechanism to secure the staircase in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a vertical ladder is used for access, then the structure remains compact and does not obstruct road traffic, but the operator safety deteriorates due to lack of lateral support and stability when opening doors
Solution Approach 1:
The patent transitions from a vertical ladder (one-dimensional vertical access) to a staircase that extends laterally from the deck (adding horizontal dimension). This lateral extension positions the operator away from the deck edge, providing lateral support and stability while maintaining compact vertical profile when not in use.
Solution Approach 2:
The staircase is designed with pivotable support legs that can be extended during use and retracted when not needed. This dynamic configuration allows the structure to adapt between a compact stored state (minimizing complexity and obstruction) and an extended operational state (maximizing operator safety and stability).
2Ease of operation
If the staircase extends laterally from the deck, then operator stability improves with handrails and proper positioning, but the risk of obstructing road traffic increases
Solution Approach 1:
The support legs are designed to be extendable and retractable, allowing the staircase to dynamically adjust its lateral extension. During operator access, the legs extend to provide stable lateral support; when not in use, they retract to minimize obstruction to road traffic, thus balancing operator stability with traffic safety.
Solution Approach 2:
The pivotable support legs act as intermediaries between the fixed deck mounting and the ground surface. They provide the necessary lateral extension for operator stability while controlling the extent of obstruction to road traffic through their adjustable configuration.
3Adaptability or versatility
If the staircase is fixed in position, then structural simplicity is maintained, but adaptability to various crane configurations and movements is reduced
Solution Approach 1:
The staircase mounting system incorporates pivotable support legs that can adjust their position and angle. This dynamic capability allows the fixed-mounted staircase to adapt to various crane configurations and movements, accommodating changes in deck elevation and position without requiring complex active control mechanisms.
Solution Approach 2:
The support legs can change their geometric parameters (angle, extension length) to accommodate different crane operating conditions. This passive adaptation through parameter adjustment provides versatility while maintaining relative structural simplicity compared to actively controlled systems.
4Reliability
If heavy-duty mounting features are used to secure the staircase, then reliability improves, but the ability to reposition the staircase along the deck is reduced
Solution Approach 1:
The mounting system is segmented into discrete mounting points along the deck and corresponding attachment features on the support legs. This segmentation allows the staircase to be securely mounted at multiple positions, providing both reliable securement when attached and the ability to reposition by detaching and reattaching at different locations.
Solution Approach 2:
The mounting connection is designed to be dynamically adjustable between secured and detached states. Heavy-duty mounting features provide reliable securement when engaged, while the same features allow controlled detachment for repositioning, balancing reliability with repositionability.
Data Source
AI summary
An access system for facilitating access to an elevated deck of a mobile crane includes a staircase having a support post defining an axis of inclination. A plurality of ascending steps is connected to the at least one support post, and a mounting bracket is pivotally coupled to an upper end of the at least one support post. The staircase is pivotable about a longitudinal axis such that a lower end of the at least one support post is induced to move in a lateral direction in response to pivotal motion of the at least one support post. A caster is coupled to the lower end of the support post for supporting the staircase on a ground surface. The caster supports the staircase on the ground surface throughout longitudinal movements of the staircase and lateral movements of the staircase induced by vertical movements of the mobile crane.