Extendable Catwalk for Construction Machine Superstructure
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Solution Overview
Problem
Existing upper carriages for construction machines face challenges in providing safe and accessible maintenance routes while minimizing space and external dimensions, as fixed catwalks either reduce installation space or increase machine size, and fold-out designs are exposed to dirt and affect appearance.
Innovation Solution
A horizontally extendable pull-out element with telescopic rails allows for a compact and safe catwalk formation, where the pull-out element can be easily extended to create a catwalk with integrated fall protection, and a removable base plate can be stored separately to form a protected working area with a parapet and protective roof.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed catwalk is provided along the housing, then safe access is ensured, but the installation space is reduced or external dimensions increase
Solution Approach 1:
The patent applies the dynamics principle by providing a pull-out element that can be extended horizontally from the housing to form a catwalk when needed, and retracted when not in use. This dynamic structure allows the catwalk to be present only during maintenance operations, eliminating the need for permanent fixed catwalks that occupy installation space or increase external dimensions.
2Ease of operation
If an external grating is applied to form a fold-out catwalk, then access is provided, but the appearance is affected and the structure is exposed to dirt
Solution Approach 1:
The patent merges the catwalk structure with the housing by integrating the pull-out element into the housing body. The catwalk is formed by extending the pull-out element from the housing, creating a unified structure that is protected by the housing when retracted. This integration protects the catwalk structure from dirt exposure and preserves the appearance of the housing when the catwalk is not in use.
3Ease of operation
If the access wall is opened to form a horizontal walkway, then maintenance access is enabled, but operator safety is compromised during handling
Solution Approach 1:
The patent segments the access system into two independent components: the access wall for opening the housing and the pull-out element for forming the catwalk. The pull-out element can be extended to provide a safe walking surface before the access wall is opened, or independently of the access wall operation. This segmentation allows the catwalk to be formed and secured before personnel need to access the housing, eliminating the safety risk of working near an open access wall.
Data Source
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AI summary
The invention relates to a superstructure for a construction machine with a housing (12) which has side walls (20), wherein at least one housing opening (22) with an access wall (30) is provided for access to the housing (12), which can be adjusted into an open position by means of an adjustment mechanism, and a horizontal walkway (60) is formed in a region in front of the housing opening (22). According to the invention, at least one extension element (50) is provided, which is horizontally extendable between a retracted position and an extended position in which the wall element projects horizontally from the housing, and a base plate (52) is provided on the extension element (50) to form the walkway (60).